diff --git a/config/version b/config/version
index 391e9856..6799bc92 100644
--- a/config/version
+++ b/config/version
@@ -1 +1 @@
-2.9.2
\ No newline at end of file
+2.9.2-sharequota1
diff --git a/database/model/model.go b/database/model/model.go
index 01654d22..7d27d717 100644
--- a/database/model/model.go
+++ b/database/model/model.go
@@ -145,6 +145,7 @@ type Client struct {
 	SubID      string `json:"subId" form:"subId"`           // Subscription identifier
 	Comment    string `json:"comment" form:"comment"`       // Client comment
 	Reset      int    `json:"reset" form:"reset"`           // Reset period in days
+	ShareQuota bool   `json:"shareQuota" form:"shareQuota"` // Pool totalGB/expiryTime with siblings sharing subId
 	CreatedAt  int64  `json:"created_at,omitempty"`         // Creation timestamp
 	UpdatedAt  int64  `json:"updated_at,omitempty"`         // Last update timestamp
 }
diff --git a/sub/subService.go b/sub/subService.go
index 272bf9d5..f281cef3 100644
--- a/sub/subService.go
+++ b/sub/subService.go
@@ -45,6 +45,7 @@ func (s *SubService) GetSubs(subId string, host string) ([]string, int64, xray.C
 	var traffic xray.ClientTraffic
 	var lastOnline int64
 	var clientTraffics []xray.ClientTraffic
+	var clientShared []bool
 	inbounds, err := s.getInboundsBySubId(subId)
 	if err != nil {
 		return nil, 0, traffic, err
@@ -80,6 +81,7 @@ func (s *SubService) GetSubs(subId string, host string) ([]string, int64, xray.C
 				result = append(result, link)
 				ct := s.getClientTraffics(inbound.ClientStats, client.Email)
 				clientTraffics = append(clientTraffics, ct)
+				clientShared = append(clientShared, client.ShareQuota)
 				if ct.LastOnline > lastOnline {
 					lastOnline = ct.LastOnline
 				}
@@ -87,28 +89,90 @@ func (s *SubService) GetSubs(subId string, host string) ([]string, int64, xray.C
 		}
 	}
 
-	// Prepare statistics
-	for index, clientTraffic := range clientTraffics {
-		if index == 0 {
-			traffic.Up = clientTraffic.Up
-			traffic.Down = clientTraffic.Down
-			traffic.Total = clientTraffic.Total
-			if clientTraffic.ExpiryTime > 0 {
-				traffic.ExpiryTime = clientTraffic.ExpiryTime
+	// Detect whether any member of this subId opted into shared quota.
+	hasShared := false
+	for _, shared := range clientShared {
+		if shared {
+			hasShared = true
+			break
+		}
+	}
+
+	if !hasShared {
+		// No shareQuota in this subId: preserve the original aggregation (Total
+		// sums across members; ExpiryTime collapses to 0 when members disagree).
+		for index, clientTraffic := range clientTraffics {
+			if index == 0 {
+				traffic.Up = clientTraffic.Up
+				traffic.Down = clientTraffic.Down
+				traffic.Total = clientTraffic.Total
+				if clientTraffic.ExpiryTime > 0 {
+					traffic.ExpiryTime = clientTraffic.ExpiryTime
+				}
+			} else {
+				traffic.Up += clientTraffic.Up
+				traffic.Down += clientTraffic.Down
+				if traffic.Total == 0 || clientTraffic.Total == 0 {
+					traffic.Total = 0
+				} else {
+					traffic.Total += clientTraffic.Total
+				}
+				if clientTraffic.ExpiryTime != traffic.ExpiryTime {
+					traffic.ExpiryTime = 0
+				}
+			}
+		}
+		return result, lastOnline, traffic, nil
+	}
+
+	// Mixed-or-all-shared case: Up/Down sum across everyone (actual consumption).
+	// Total combines max-of-shared-totals + sum-of-unshared-totals so shared
+	// members aren't double-counted while unshared ones still add their own cap.
+	// ExpiryTime = earliest non-zero across all; 0 only if every member is unset.
+	var sharedMax int64
+	sharedMaxSeen := false
+	sharedUnlimited := false
+	var unsharedSum int64
+	unsharedUnlimited := false
+	for i, ct := range clientTraffics {
+		traffic.Up += ct.Up
+		traffic.Down += ct.Down
+		if clientShared[i] {
+			if ct.Total == 0 {
+				sharedUnlimited = true
+			} else if !sharedMaxSeen || ct.Total > sharedMax {
+				sharedMax = ct.Total
+				sharedMaxSeen = true
 			}
 		} else {
-			traffic.Up += clientTraffic.Up
-			traffic.Down += clientTraffic.Down
-			if traffic.Total == 0 || clientTraffic.Total == 0 {
-				traffic.Total = 0
+			if ct.Total == 0 {
+				unsharedUnlimited = true
 			} else {
-				traffic.Total += clientTraffic.Total
-			}
-			if clientTraffic.ExpiryTime != traffic.ExpiryTime {
-				traffic.ExpiryTime = 0
+				unsharedSum += ct.Total
 			}
 		}
 	}
+	if sharedUnlimited || unsharedUnlimited {
+		traffic.Total = 0
+	} else {
+		traffic.Total = 0
+		if sharedMaxSeen {
+			traffic.Total += sharedMax
+		}
+		traffic.Total += unsharedSum
+	}
+
+	traffic.ExpiryTime = 0
+	expirySet := false
+	for _, ct := range clientTraffics {
+		if ct.ExpiryTime == 0 {
+			continue
+		}
+		if !expirySet || ct.ExpiryTime < traffic.ExpiryTime {
+			traffic.ExpiryTime = ct.ExpiryTime
+			expirySet = true
+		}
+	}
 	return result, lastOnline, traffic, nil
 }
 
diff --git a/web/assets/js/model/inbound.js b/web/assets/js/model/inbound.js
index 26da6cb3..e7880ab9 100644
--- a/web/assets/js/model/inbound.js
+++ b/web/assets/js/model/inbound.js
@@ -2087,6 +2087,7 @@ Inbound.ClientBase = class extends XrayCommonClass {
         reset = 0,
         created_at = undefined,
         updated_at = undefined,
+        shareQuota = false,
     ) {
         super();
         this.email = email;
@@ -2100,6 +2101,7 @@ Inbound.ClientBase = class extends XrayCommonClass {
         this.reset = reset;
         this.created_at = created_at;
         this.updated_at = updated_at;
+        this.shareQuota = !!shareQuota;
     }
 
     static commonArgsFromJson(json = {}) {
@@ -2115,6 +2117,7 @@ Inbound.ClientBase = class extends XrayCommonClass {
             json.reset,
             json.created_at,
             json.updated_at,
+            json.shareQuota,
         ];
     }
 
@@ -2131,6 +2134,7 @@ Inbound.ClientBase = class extends XrayCommonClass {
             reset: this.reset,
             created_at: this.created_at,
             updated_at: this.updated_at,
+            shareQuota: !!this.shareQuota,
         };
     }
 
@@ -2204,9 +2208,9 @@ Inbound.VmessSettings.VMESS = class extends Inbound.ClientBase {
     constructor(
         id = RandomUtil.randomUUID(),
         security = USERS_SECURITY.AUTO,
-        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at,
+        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota,
     ) {
-        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at);
+        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota);
         this.id = id;
         this.security = security;
     }
@@ -2309,9 +2313,9 @@ Inbound.VLESSSettings.VLESS = class extends Inbound.ClientBase {
     constructor(
         id = RandomUtil.randomUUID(),
         flow = '',
-        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at,
+        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota,
     ) {
-        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at);
+        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota);
         this.id = id;
         this.flow = flow;
     }
@@ -2407,9 +2411,9 @@ Inbound.TrojanSettings = class extends Inbound.Settings {
 Inbound.TrojanSettings.Trojan = class extends Inbound.ClientBase {
     constructor(
         password = RandomUtil.randomSeq(10),
-        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at,
+        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota,
     ) {
-        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at);
+        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota);
         this.password = password;
     }
 
@@ -2509,9 +2513,9 @@ Inbound.ShadowsocksSettings.Shadowsocks = class extends Inbound.ClientBase {
     constructor(
         method = '',
         password = RandomUtil.randomShadowsocksPassword(),
-        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at,
+        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota,
     ) {
-        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at);
+        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota);
         this.method = method;
         this.password = password;
     }
@@ -2559,9 +2563,9 @@ Inbound.HysteriaSettings = class extends Inbound.Settings {
 Inbound.HysteriaSettings.Hysteria = class extends Inbound.ClientBase {
     constructor(
         auth = RandomUtil.randomSeq(10),
-        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at,
+        email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota,
     ) {
-        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at);
+        super(email, limitIp, totalGB, expiryTime, enable, tgId, subId, comment, reset, created_at, updated_at, shareQuota);
         this.auth = auth;
     }
 
diff --git a/web/html/form/client.html b/web/html/form/client.html
index 9c6a7f8a..44866be4 100644
--- a/web/html/form/client.html
+++ b/web/html/form/client.html
@@ -108,6 +108,18 @@
     </template>
     <a-input v-model.trim="client.subId"></a-input>
   </a-form-item>
+  <a-form-item v-if="client.email && app.subSettings?.enable && client.subId">
+    <template slot="label">
+      <a-tooltip>
+        <template slot="title">
+          <span>{{ i18n "pages.inbounds.shareQuotaDesc" }}</span>
+        </template>
+        <span>{{ i18n "pages.inbounds.shareQuota" }}</span>
+        <a-icon type="question-circle"></a-icon>
+      </a-tooltip>
+    </template>
+    <a-switch v-model="client.shareQuota"></a-switch>
+  </a-form-item>
   <a-form-item v-if="client.email && app.tgBotEnable">
     <template slot="label">
       <a-tooltip>
diff --git a/web/html/inbounds.html b/web/html/inbounds.html
index b8485702..0f55c6c9 100644
--- a/web/html/inbounds.html
+++ b/web/html/inbounds.html
@@ -1183,7 +1183,89 @@
           this.ipLimitEnable = ipLimitEnable;
         }
       },
+      applyShareQuotaPooling(dbInbounds) {
+        // For every client that opted into shareQuota and has a subId, replace
+        // its clientStats up/down/allTime/total/expiryTime with values pooled
+        // across every sibling sharing the same subId. Existing rendering
+        // helpers (getUpStats, statsProgress, ...) then show the pooled totals
+        // without further changes.
+        //
+        // Note: enable is intentionally NOT pooled so an admin who disables a
+        // single sibling doesn't visually disable the others; depletion-driven
+        // disables are already applied per-row by the backend to every group
+        // member.
+        //
+        // The original per-row values are stashed under `_sharedQuotaRaw*` on
+        // first mutation so repeated calls on the same objects stay idempotent
+        // (no double-summing if setInbounds runs twice against the same array).
+        const readRaw = (stats, key) => {
+          const rawKey = '_sharedQuotaRaw_' + key;
+          return stats[rawKey] !== undefined ? stats[rawKey] : stats[key];
+        };
+        const stashRaw = (stats, key) => {
+          const rawKey = '_sharedQuotaRaw_' + key;
+          if (stats[rawKey] === undefined) stats[rawKey] = stats[key];
+        };
+        const groups = {};
+        for (const dbInbound of dbInbounds) {
+          if (!dbInbound.settings || dbInbound.settings.length === 0) continue;
+          let parsed;
+          try { parsed = JSON.parse(dbInbound.settings); } catch (_) { continue; }
+          const clients = parsed && parsed.clients;
+          if (!Array.isArray(clients)) continue;
+          for (const c of clients) {
+            if (!c || !c.shareQuota || !c.subId || !c.email) continue;
+            if (!groups[c.subId]) groups[c.subId] = { members: [] };
+            groups[c.subId].members.push({ dbInbound, email: c.email });
+          }
+        }
+        for (const subId in groups) {
+          const g = groups[subId];
+          if (g.members.length < 1) continue;
+          let up = 0, down = 0, allTime = 0;
+          let total = 0, totalUnlimited = false;
+          let expiryTime = 0, expiryNever = false, expirySet = false;
+          const rows = [];
+          for (const m of g.members) {
+            const stats = (m.dbInbound.clientStats || []).find(r => r.email === m.email);
+            if (!stats) continue;
+            rows.push(stats);
+            const rawUp = readRaw(stats, 'up');
+            const rawDown = readRaw(stats, 'down');
+            const rawAllTime = readRaw(stats, 'allTime');
+            const rawTotal = readRaw(stats, 'total');
+            const rawExpiry = readRaw(stats, 'expiryTime');
+            up += rawUp || 0;
+            down += rawDown || 0;
+            allTime += rawAllTime || 0;
+            if (rawTotal === 0) totalUnlimited = true;
+            else if (rawTotal > total) total = rawTotal;
+            if (rawExpiry === 0) expiryNever = true;
+            else {
+              if (!expirySet || rawExpiry < expiryTime) {
+                expiryTime = rawExpiry;
+                expirySet = true;
+              }
+            }
+          }
+          const pooledTotal = totalUnlimited ? 0 : total;
+          const pooledExpiry = expiryNever ? 0 : (expirySet ? expiryTime : 0);
+          for (const r of rows) {
+            stashRaw(r, 'up');
+            stashRaw(r, 'down');
+            stashRaw(r, 'allTime');
+            stashRaw(r, 'total');
+            stashRaw(r, 'expiryTime');
+            r.up = up;
+            r.down = down;
+            r.allTime = allTime;
+            r.total = pooledTotal;
+            r.expiryTime = pooledExpiry;
+          }
+        }
+      },
       setInbounds(dbInbounds) {
+        this.applyShareQuotaPooling(dbInbounds);
         this.inbounds.splice(0);
         this.dbInbounds.splice(0);
         this.clientCount.splice(0);
diff --git a/web/service/inbound.go b/web/service/inbound.go
index 7d5d8932..3f764f3f 100644
--- a/web/service/inbound.go
+++ b/web/service/inbound.go
@@ -722,6 +722,49 @@ func (s *InboundService) AddInboundClient(data *model.Inbound) (bool, error) {
 		}
 	}()
 
+	// Coerce any incoming share-quota clients to the canonical values of an
+	// existing group (same subId, shareQuota=true), so a new arrival doesn't
+	// overwrite siblings' quota/expiry. Mutate both the typed slice and the JSON
+	// interface slice that gets persisted.
+	for i := range clients {
+		c := &clients[i]
+		if !c.ShareQuota || c.SubID == "" {
+			continue
+		}
+		var (
+			groupTotal  int64
+			groupExpiry int64
+			exists      bool
+		)
+		groupTotal, groupExpiry, exists, err = s.shareQuotaGroupValues(tx, c.SubID, c.Email)
+		if err != nil {
+			return false, err
+		}
+		if !exists {
+			continue
+		}
+		c.TotalGB = groupTotal
+		c.ExpiryTime = groupExpiry
+		for j := range interfaceClients {
+			cm, ok := interfaceClients[j].(map[string]any)
+			if !ok {
+				continue
+			}
+			if cm["email"] == c.Email {
+				cm["totalGB"] = groupTotal
+				cm["expiryTime"] = groupExpiry
+				interfaceClients[j] = cm
+			}
+		}
+	}
+	// Re-marshal settings in case share-quota coercion rewrote any client values.
+	oldSettings["clients"] = oldClients
+	newSettings, err = json.MarshalIndent(oldSettings, "", "  ")
+	if err != nil {
+		return false, err
+	}
+	oldInbound.Settings = string(newSettings)
+
 	needRestart := false
 	s.xrayApi.Init(p.GetAPIPort())
 	for _, client := range clients {
@@ -754,7 +797,20 @@ func (s *InboundService) AddInboundClient(data *model.Inbound) (bool, error) {
 	}
 	s.xrayApi.Close()
 
-	return needRestart, tx.Save(oldInbound).Error
+	if err = tx.Save(oldInbound).Error; err != nil {
+		return needRestart, err
+	}
+
+	// After the new client rows exist, sync quota/expiry across every member of
+	// this share-quota group so they all agree.
+	for _, client := range clients {
+		if client.ShareQuota && client.SubID != "" {
+			if err = s.propagateShareQuota(tx, client.SubID, client.TotalGB, client.ExpiryTime); err != nil {
+				return needRestart, err
+			}
+		}
+	}
+	return needRestart, nil
 }
 
 func (s *InboundService) getClientPrimaryKey(protocol model.Protocol, client model.Client) string {
@@ -1115,13 +1171,22 @@ func (s *InboundService) UpdateInboundClient(data *model.Inbound, clientId strin
 		return false, err
 	}
 	settingsClients := oldSettings["clients"].([]any)
-	// Preserve created_at and set updated_at for the replacing client
+	// Preserve created_at and set updated_at for the replacing client.
+	// Also preserve shareQuota if the incoming payload is missing the key
+	// (defensive: protects against clients running outdated JS that doesn't
+	// serialize the field).
 	var preservedCreated any
+	var preservedShareQuota any
+	var hadOldShareQuota bool
 	if clientIndex >= 0 && clientIndex < len(settingsClients) {
 		if oldMap, ok := settingsClients[clientIndex].(map[string]any); ok {
 			if v, ok2 := oldMap["created_at"]; ok2 {
 				preservedCreated = v
 			}
+			if v, ok2 := oldMap["shareQuota"]; ok2 {
+				preservedShareQuota = v
+				hadOldShareQuota = true
+			}
 		}
 	}
 	if len(interfaceClients) > 0 {
@@ -1131,6 +1196,26 @@ func (s *InboundService) UpdateInboundClient(data *model.Inbound, clientId strin
 			}
 			newMap["created_at"] = preservedCreated
 			newMap["updated_at"] = time.Now().Unix() * 1000
+			if _, hasShare := newMap["shareQuota"]; !hasShare && hadOldShareQuota {
+				// Normalise to bool; tolerate "true"/"false"/"1"/"0" strings or
+				// numeric 0/1 in case a legacy record stored a non-boolean.
+				var asBool bool
+				switch v := preservedShareQuota.(type) {
+				case bool:
+					asBool = v
+				case string:
+					asBool = strings.EqualFold(v, "true") || v == "1"
+				case float64:
+					asBool = v != 0
+				case int:
+					asBool = v != 0
+				case int64:
+					asBool = v != 0
+				}
+				newMap["shareQuota"] = asBool
+				// Keep the typed clients[0] consistent so downstream propagation sees it.
+				clients[0].ShareQuota = asBool
+			}
 			interfaceClients[0] = newMap
 		}
 	}
@@ -1219,7 +1304,17 @@ func (s *InboundService) UpdateInboundClient(data *model.Inbound, clientId strin
 		logger.Debug("Client old email not found")
 		needRestart = true
 	}
-	return needRestart, tx.Save(oldInbound).Error
+	if err = tx.Save(oldInbound).Error; err != nil {
+		return needRestart, err
+	}
+	// If the saved client opted into share-quota, propagate its totalGB/expiryTime
+	// to every sibling with the same subId that also has shareQuota enabled.
+	if clients[0].ShareQuota && clients[0].SubID != "" {
+		if err = s.propagateShareQuota(tx, clients[0].SubID, clients[0].TotalGB, clients[0].ExpiryTime); err != nil {
+			return needRestart, err
+		}
+	}
+	return needRestart, nil
 }
 
 func (s *InboundService) AddTraffic(inboundTraffics []*xray.Traffic, clientTraffics []*xray.ClientTraffic) (error, bool) {
@@ -1536,22 +1631,343 @@ func (s *InboundService) disableInvalidInbounds(tx *gorm.DB) (bool, int64, error
 	return needRestart, count, err
 }
 
+// shareQuotaMember describes a single client participating in a shared-quota group.
+type shareQuotaMember struct {
+	Email     string
+	InboundId int
+	Tag       string
+}
+
+// shareQuotaGroup pools totalGB and expiryTime across clients sharing the same subId
+// and having ShareQuota enabled. MaxTotal=0 means unlimited; MinExpiry=0 means never.
+type shareQuotaGroup struct {
+	Members   []shareQuotaMember
+	TotalUp   int64
+	TotalDown int64
+	MaxTotal  int64
+	MinExpiry int64
+}
+
+// computeShareQuotaGroups walks every inbound's settings JSON, collects clients
+// with shareQuota==true && subId!="", groups them by subId, and joins with client_traffics
+// to accumulate pooled usage. Keyed by subId. Disabled inbounds are included so
+// a re-enable doesn't reset accounting.
+func (s *InboundService) computeShareQuotaGroups(tx *gorm.DB) (map[string]*shareQuotaGroup, error) {
+	var inbounds []*model.Inbound
+	err := tx.Model(model.Inbound{}).Find(&inbounds).Error
+	if err != nil {
+		return nil, err
+	}
+
+	groups := make(map[string]*shareQuotaGroup)
+	type memberMeta struct {
+		member shareQuotaMember
+		total  int64
+		expiry int64
+	}
+	staged := make(map[string][]memberMeta)
+
+	for _, inbound := range inbounds {
+		clients, err := s.GetClients(inbound)
+		if err != nil || clients == nil {
+			continue
+		}
+		for _, c := range clients {
+			if !c.ShareQuota || c.SubID == "" || c.Email == "" {
+				continue
+			}
+			staged[c.SubID] = append(staged[c.SubID], memberMeta{
+				member: shareQuotaMember{Email: c.Email, InboundId: inbound.Id, Tag: inbound.Tag},
+				total:  c.TotalGB,
+				expiry: c.ExpiryTime,
+			})
+		}
+	}
+
+	if len(staged) == 0 {
+		return groups, nil
+	}
+
+	// Collect every email in any group so we can fetch traffic in a single query.
+	emails := make([]string, 0)
+	for _, members := range staged {
+		for _, m := range members {
+			emails = append(emails, m.member.Email)
+		}
+	}
+	var trafficRows []xray.ClientTraffic
+	if len(emails) > 0 {
+		if err := tx.Model(xray.ClientTraffic{}).Where("email IN (?)", emails).Find(&trafficRows).Error; err != nil {
+			return nil, err
+		}
+	}
+	usage := make(map[string]*xray.ClientTraffic, len(trafficRows))
+	for i := range trafficRows {
+		usage[trafficRows[i].Email] = &trafficRows[i]
+	}
+
+	for subId, members := range staged {
+		if len(members) < 1 {
+			continue
+		}
+		g := &shareQuotaGroup{}
+		// Semantics: MaxTotal==0 means unlimited. If any member is unlimited (total==0)
+		// the group is unlimited; otherwise MaxTotal = max of member totals.
+		// Same pattern for MinExpiry: 0 means never.
+		var maxTotal int64
+		maxTotalSeen := false
+		anyUnlimited := false
+		var minExpiry int64
+		minExpirySeen := false
+		anyNever := false
+		for _, m := range members {
+			g.Members = append(g.Members, m.member)
+			if m.total == 0 {
+				anyUnlimited = true
+			} else if !maxTotalSeen || m.total > maxTotal {
+				maxTotal = m.total
+				maxTotalSeen = true
+			}
+			if m.expiry == 0 {
+				anyNever = true
+			} else if !minExpirySeen || m.expiry < minExpiry {
+				minExpiry = m.expiry
+				minExpirySeen = true
+			}
+			// Accumulate usage from client_traffics.
+			if t, ok := usage[m.member.Email]; ok {
+				g.TotalUp += t.Up
+				g.TotalDown += t.Down
+			}
+		}
+		if anyUnlimited {
+			g.MaxTotal = 0
+		} else {
+			g.MaxTotal = maxTotal
+		}
+		if anyNever {
+			g.MinExpiry = 0
+		} else {
+			g.MinExpiry = minExpiry
+		}
+		groups[subId] = g
+	}
+
+	return groups, nil
+}
+
+// propagateShareQuota keeps totalGB and expiryTime in sync across every client with a
+// matching subId where shareQuota is true. Writes both inbounds.settings JSON and the
+// affected client_traffics rows inside the provided transaction.
+func (s *InboundService) propagateShareQuota(tx *gorm.DB, subId string, totalGB, expiryTime int64) error {
+	if subId == "" {
+		return nil
+	}
+
+	var inbounds []*model.Inbound
+	err := tx.Model(model.Inbound{}).Where(`id in (
+		SELECT DISTINCT inbounds.id
+		FROM inbounds,
+			JSON_EACH(JSON_EXTRACT(inbounds.settings, '$.clients')) AS client
+		WHERE JSON_EXTRACT(client.value, '$.subId') = ?
+			AND (JSON_EXTRACT(client.value, '$.shareQuota') = 1
+				OR JSON_EXTRACT(client.value, '$.shareQuota') = 'true'
+				OR JSON_EXTRACT(client.value, '$.shareQuota') = TRUE)
+	)`, subId).Find(&inbounds).Error
+	if err != nil {
+		return err
+	}
+	if len(inbounds) == 0 {
+		return nil
+	}
+
+	nowMs := time.Now().Unix() * 1000
+	touchedEmails := make([]string, 0)
+
+	for ibIdx := range inbounds {
+		var settings map[string]any
+		if err := json.Unmarshal([]byte(inbounds[ibIdx].Settings), &settings); err != nil {
+			return err
+		}
+		rawClients, ok := settings["clients"].([]any)
+		if !ok {
+			continue
+		}
+		changed := false
+		for cIdx := range rawClients {
+			cm, ok := rawClients[cIdx].(map[string]any)
+			if !ok {
+				continue
+			}
+			// Type-safe field checks: JSON numbers unmarshal as float64.
+			cSub, _ := cm["subId"].(string)
+			cShare, _ := cm["shareQuota"].(bool)
+			if cSub != subId || !cShare {
+				continue
+			}
+			cm["totalGB"] = totalGB
+			cm["expiryTime"] = expiryTime
+			cm["updated_at"] = nowMs
+			rawClients[cIdx] = cm
+			changed = true
+			if email, ok := cm["email"].(string); ok && email != "" {
+				touchedEmails = append(touchedEmails, email)
+			}
+		}
+		if !changed {
+			continue
+		}
+		settings["clients"] = rawClients
+		newSettings, err := json.MarshalIndent(settings, "", "  ")
+		if err != nil {
+			return err
+		}
+		inbounds[ibIdx].Settings = string(newSettings)
+		if err := tx.Save(inbounds[ibIdx]).Error; err != nil {
+			return err
+		}
+	}
+
+	if len(touchedEmails) == 0 {
+		return nil
+	}
+	return tx.Model(xray.ClientTraffic{}).
+		Where("email IN (?)", touchedEmails).
+		Updates(map[string]any{
+			"total":       totalGB,
+			"expiry_time": expiryTime,
+		}).Error
+}
+
+// shareQuotaGroupValues returns the canonical totalGB/expiryTime of an existing group
+// (same subId, shareQuota=true) if one exists, and a bool indicating whether it exists.
+// Used so that a client joining an existing group adopts the group's values instead of
+// resetting every sibling to the new arrival's values.
+func (s *InboundService) shareQuotaGroupValues(tx *gorm.DB, subId string, excludeEmail string) (totalGB int64, expiryTime int64, exists bool, err error) {
+	if subId == "" {
+		return 0, 0, false, nil
+	}
+	var inbounds []*model.Inbound
+	err = tx.Model(model.Inbound{}).Where(`id in (
+		SELECT DISTINCT inbounds.id
+		FROM inbounds,
+			JSON_EACH(JSON_EXTRACT(inbounds.settings, '$.clients')) AS client
+		WHERE JSON_EXTRACT(client.value, '$.subId') = ?
+			AND (JSON_EXTRACT(client.value, '$.shareQuota') = 1
+				OR JSON_EXTRACT(client.value, '$.shareQuota') = 'true'
+				OR JSON_EXTRACT(client.value, '$.shareQuota') = TRUE)
+	)`, subId).Find(&inbounds).Error
+	if err != nil {
+		return 0, 0, false, err
+	}
+	for _, ib := range inbounds {
+		clients, errC := s.GetClients(ib)
+		if errC != nil {
+			continue
+		}
+		for _, c := range clients {
+			if c.SubID != subId || !c.ShareQuota {
+				continue
+			}
+			if excludeEmail != "" && c.Email == excludeEmail {
+				continue
+			}
+			return c.TotalGB, c.ExpiryTime, true, nil
+		}
+	}
+	return 0, 0, false, nil
+}
+
 func (s *InboundService) disableInvalidClients(tx *gorm.DB) (bool, int64, error) {
 	now := time.Now().Unix() * 1000
 	needRestart := false
 
+	// First pass: handle share-quota groups so members are disabled together and
+	// excluded from the per-client pass below.
+	handledEmails := make(map[string]bool)
+	groups, err := s.computeShareQuotaGroups(tx)
+	if err != nil {
+		return false, 0, err
+	}
+	groupDepletedEmails := make([]string, 0)
+	if len(groups) > 0 && p != nil {
+		s.xrayApi.Init(p.GetAPIPort())
+		for _, g := range groups {
+			depleted := (g.MaxTotal > 0 && g.TotalUp+g.TotalDown >= g.MaxTotal) ||
+				(g.MinExpiry > 0 && g.MinExpiry <= now)
+			if !depleted {
+				continue
+			}
+			for _, m := range g.Members {
+				if handledEmails[m.Email] {
+					continue
+				}
+				err1 := s.xrayApi.RemoveUser(m.Tag, m.Email)
+				if err1 == nil {
+					logger.Debug("Shared-quota client disabled by api:", m.Email)
+				} else if strings.Contains(err1.Error(), fmt.Sprintf("User %s not found.", m.Email)) {
+					logger.Debug("Shared-quota user already disabled. Nothing to do.")
+				} else {
+					logger.Debug("Error disabling shared-quota client by api:", err1)
+					needRestart = true
+				}
+				handledEmails[m.Email] = true
+				groupDepletedEmails = append(groupDepletedEmails, m.Email)
+			}
+		}
+		s.xrayApi.Close()
+	} else if len(groups) > 0 {
+		// No p (Xray process) available — still collect emails so DB state is consistent.
+		for _, g := range groups {
+			depleted := (g.MaxTotal > 0 && g.TotalUp+g.TotalDown >= g.MaxTotal) ||
+				(g.MinExpiry > 0 && g.MinExpiry <= now)
+			if !depleted {
+				continue
+			}
+			for _, m := range g.Members {
+				if handledEmails[m.Email] {
+					continue
+				}
+				handledEmails[m.Email] = true
+				groupDepletedEmails = append(groupDepletedEmails, m.Email)
+			}
+		}
+	}
+	if len(groupDepletedEmails) > 0 {
+		if err := tx.Model(xray.ClientTraffic{}).
+			Where("email IN (?)", groupDepletedEmails).
+			Update("enable", false).Error; err != nil {
+			return false, 0, err
+		}
+	}
+
+	// Build exclusion list for the per-client pass. Also exclude every email in any
+	// non-depleted share-quota group — their quota is pooled and mustn't be judged
+	// individually on the single-row thresholds.
+	excludedEmails := make([]string, 0)
+	for _, g := range groups {
+		for _, m := range g.Members {
+			if !handledEmails[m.Email] {
+				excludedEmails = append(excludedEmails, m.Email)
+			}
+		}
+	}
+	excludedEmails = append(excludedEmails, groupDepletedEmails...)
+
 	if p != nil {
 		var results []struct {
 			Tag   string
 			Email string
 		}
 
-		err := tx.Table("inbounds").
+		q := tx.Table("inbounds").
 			Select("inbounds.tag, client_traffics.email").
 			Joins("JOIN client_traffics ON inbounds.id = client_traffics.inbound_id").
-			Where("((client_traffics.total > 0 AND client_traffics.up + client_traffics.down >= client_traffics.total) OR (client_traffics.expiry_time > 0 AND client_traffics.expiry_time <= ?)) AND client_traffics.enable = ?", now, true).
-			Scan(&results).Error
-		if err != nil {
+			Where("((client_traffics.total > 0 AND client_traffics.up + client_traffics.down >= client_traffics.total) OR (client_traffics.expiry_time > 0 AND client_traffics.expiry_time <= ?)) AND client_traffics.enable = ?", now, true)
+		if len(excludedEmails) > 0 {
+			q = q.Where("client_traffics.email NOT IN (?)", excludedEmails)
+		}
+		if err := q.Scan(&results).Error; err != nil {
 			return false, 0, err
 		}
 		s.xrayApi.Init(p.GetAPIPort())
@@ -1563,22 +1979,21 @@ func (s *InboundService) disableInvalidClients(tx *gorm.DB) (bool, int64, error)
 				if strings.Contains(err1.Error(), fmt.Sprintf("User %s not found.", result.Email)) {
 					logger.Debug("User is already disabled. Nothing to do more...")
 				} else {
-					if strings.Contains(err1.Error(), fmt.Sprintf("User %s not found.", result.Email)) {
-						logger.Debug("User is already disabled. Nothing to do more...")
-					} else {
-						logger.Debug("Error in disabling client by api:", err1)
-						needRestart = true
-					}
+					logger.Debug("Error in disabling client by api:", err1)
+					needRestart = true
 				}
 			}
 		}
 		s.xrayApi.Close()
 	}
-	result := tx.Model(xray.ClientTraffic{}).
-		Where("((total > 0 and up + down >= total) or (expiry_time > 0 and expiry_time <= ?)) and enable = ?", now, true).
-		Update("enable", false)
-	err := result.Error
-	count := result.RowsAffected
+	updateQ := tx.Model(xray.ClientTraffic{}).
+		Where("((total > 0 and up + down >= total) or (expiry_time > 0 and expiry_time <= ?)) and enable = ?", now, true)
+	if len(excludedEmails) > 0 {
+		updateQ = updateQ.Where("email NOT IN (?)", excludedEmails)
+	}
+	result := updateQ.Update("enable", false)
+	err = result.Error
+	count := result.RowsAffected + int64(len(groupDepletedEmails))
 	return needRestart, count, err
 }
 
diff --git a/web/translation/translate.ar_EG.toml b/web/translation/translate.ar_EG.toml
index ca7076c8..e471d993 100644
--- a/web/translation/translate.ar_EG.toml
+++ b/web/translation/translate.ar_EG.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "استخدم شهادة البانل"
 "telegramDesc" = "ادخل ID شات Telegram. (استخدم '/id' في البوت) أو (@userinfobot)"
 "subscriptionDesc" = "عشان تلاقي رابط الاشتراك، ادخل على 'التفاصيل'. وكمان ممكن تستخدم نفس الاسم لعدة عملاء."
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "معلومات"
 "same" = "نفسه"
 "inboundData" = "بيانات الإدخال"
diff --git a/web/translation/translate.en_US.toml b/web/translation/translate.en_US.toml
index 45186187..a5c618fc 100644
--- a/web/translation/translate.en_US.toml
+++ b/web/translation/translate.en_US.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "Set Cert from Panel"
 "telegramDesc" = "Please provide Telegram Chat ID. (use '/id' command in the bot) or (@userinfobot)"
 "subscriptionDesc" = "To find your subscription URL, navigate to the 'Details'. Additionally, you can use the same name for several clients."
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "Info"
 "same" = "Same"
 "inboundData" = "Inbound's Data"
diff --git a/web/translation/translate.es_ES.toml b/web/translation/translate.es_ES.toml
index d8f94461..549e0750 100644
--- a/web/translation/translate.es_ES.toml
+++ b/web/translation/translate.es_ES.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "Establecer certificado desde el panel"
 "telegramDesc" = "Por favor, proporciona el ID de Chat de Telegram. (usa el comando '/id' en el bot) o (@userinfobot)"
 "subscriptionDesc" = "Puedes encontrar tu enlace de suscripción en Detalles, también puedes usar el mismo nombre para varias configuraciones."
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "Info"
 "same" = "misma"
 "inboundData" = "Datos de entrada"
diff --git a/web/translation/translate.fa_IR.toml b/web/translation/translate.fa_IR.toml
index aaec75f6..cc953f20 100644
--- a/web/translation/translate.fa_IR.toml
+++ b/web/translation/translate.fa_IR.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "استفاده از گواهی پنل"
 "telegramDesc" = "لطفا شناسه گفتگوی تلگرام را وارد کنید. (از دستور '/id' در ربات استفاده کنید) یا (@userinfobot)"
 "subscriptionDesc" = "شما می‌توانید لینک سابسکربپشن خودرا در 'جزئیات' پیدا کنید، همچنین می‌توانید از همین نام برای چندین کاربر استفاده‌کنید"
+"shareQuota" = "اشتراک حجم بین اینباندها"
+"shareQuotaDesc" = "مقدار حجم و تاریخ انقضا با سایر کلاینت‌هایی که همین subId را دارند و گزینه اشتراک حجم‌شان فعال است ترکیب می‌شود."
 "info" = "اطلاعات"
 "same" = "همسان"
 "inboundData" = "داده‌های ورودی"
diff --git a/web/translation/translate.id_ID.toml b/web/translation/translate.id_ID.toml
index e115aaa8..ae7d327b 100644
--- a/web/translation/translate.id_ID.toml
+++ b/web/translation/translate.id_ID.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "Atur Sertifikat dari Panel"
 "telegramDesc" = "Harap berikan ID Obrolan Telegram. (gunakan perintah '/id' di bot) atau (@userinfobot)"
 "subscriptionDesc" = "Untuk menemukan URL langganan Anda, buka 'Rincian'. Selain itu, Anda dapat menggunakan nama yang sama untuk beberapa klien."
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "Info"
 "same" = "Sama"
 "inboundData" = "Data Masuk"
diff --git a/web/translation/translate.ja_JP.toml b/web/translation/translate.ja_JP.toml
index ffa9168b..800d73fe 100644
--- a/web/translation/translate.ja_JP.toml
+++ b/web/translation/translate.ja_JP.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "パネル設定から証明書を設定"
 "telegramDesc" = "TelegramチャットIDを提供してください。（ボットで'/id'コマンドを使用）または（@userinfobot）"
 "subscriptionDesc" = "サブスクリプションURLを見つけるには、“詳細情報”に移動してください。また、複数のクライアントに同じ名前を使用することができます。"
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "情報"
 "same" = "同じ"
 "inboundData" = "インバウンドデータ"
diff --git a/web/translation/translate.pt_BR.toml b/web/translation/translate.pt_BR.toml
index 18db4d62..69f4b859 100644
--- a/web/translation/translate.pt_BR.toml
+++ b/web/translation/translate.pt_BR.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "Definir Certificado pelo Painel"
 "telegramDesc" = "Por favor, forneça o ID do Chat do Telegram. (use o comando '/id' no bot) ou (@userinfobot)"
 "subscriptionDesc" = "Para encontrar seu URL de assinatura, navegue até 'Detalhes'. Além disso, você pode usar o mesmo nome para vários clientes."
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "Informações"
 "same" = "Igual"
 "inboundData" = "Dados do Inbound"
diff --git a/web/translation/translate.ru_RU.toml b/web/translation/translate.ru_RU.toml
index 5bf89dfd..aa22d1de 100644
--- a/web/translation/translate.ru_RU.toml
+++ b/web/translation/translate.ru_RU.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "Установить сертификат панели"
 "telegramDesc" = "Пожалуйста, укажите Chat ID Telegram. (используйте команду '/id' в боте) или (@userinfobot)"
 "subscriptionDesc" = "Вы можете найти свою ссылку подписки в разделе 'Подробнее'"
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "Информация"
 "same" = "Тот же"
 "inboundData" = "Данные подключений"
diff --git a/web/translation/translate.tr_TR.toml b/web/translation/translate.tr_TR.toml
index 0393a7dc..d3d9beb5 100644
--- a/web/translation/translate.tr_TR.toml
+++ b/web/translation/translate.tr_TR.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "Panelden Sertifikayı Ayarla"
 "telegramDesc" = "Lütfen Telegram Sohbet Kimliği sağlayın. (botta '/id' komutunu kullanın) veya (@userinfobot)"
 "subscriptionDesc" = "Abonelik URL'inizi bulmak için 'Detaylar'a gidin. Ayrıca, aynı adı birden fazla müşteri için kullanabilirsiniz."
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "Bilgi"
 "same" = "Aynı"
 "inboundData" = "Gelenin Verileri"
diff --git a/web/translation/translate.uk_UA.toml b/web/translation/translate.uk_UA.toml
index 40bcaa76..45a3e698 100644
--- a/web/translation/translate.uk_UA.toml
+++ b/web/translation/translate.uk_UA.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "Установити сертифікат з панелі"
 "telegramDesc" = "Будь ласка, вкажіть ID чату Telegram. (використовуйте команду '/id' у боті) або (@userinfobot)"
 "subscriptionDesc" = "Щоб знайти URL-адресу вашої підписки, перейдіть до «Деталі». Крім того, ви можете використовувати одне ім'я для кількох клієнтів."
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "Інформація"
 "same" = "Те саме"
 "inboundData" = "Вхідні дані"
diff --git a/web/translation/translate.vi_VN.toml b/web/translation/translate.vi_VN.toml
index 43afe89b..df38bc62 100644
--- a/web/translation/translate.vi_VN.toml
+++ b/web/translation/translate.vi_VN.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "Đặt chứng chỉ từ bảng điều khiển"
 "telegramDesc" = "Vui lòng cung cấp ID Trò chuyện Telegram. (sử dụng lệnh '/id' trong bot) hoặc (@userinfobot)"
 "subscriptionDesc" = "Bạn có thể tìm liên kết gói đăng ký của mình trong Chi tiết, cũng như bạn có thể sử dụng cùng tên cho nhiều cấu hình khác nhau"
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "Thông tin"
 "same" = "Giống nhau"
 "inboundData" = "Dữ liệu gửi đến"
diff --git a/web/translation/translate.zh_CN.toml b/web/translation/translate.zh_CN.toml
index cb42afce..b4ace655 100644
--- a/web/translation/translate.zh_CN.toml
+++ b/web/translation/translate.zh_CN.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "从面板设置证书"
 "telegramDesc" = "请提供Telegram聊天ID。（在机器人中使用'/id'命令）或（@userinfobot"
 "subscriptionDesc" = "要找到你的订阅 URL，请导航到“详细信息”。此外，你可以为多个客户端使用相同的名称。"
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "信息"
 "same" = "相同"
 "inboundData" = "入站数据"
diff --git a/web/translation/translate.zh_TW.toml b/web/translation/translate.zh_TW.toml
index 551ebbd0..69141677 100644
--- a/web/translation/translate.zh_TW.toml
+++ b/web/translation/translate.zh_TW.toml
@@ -281,6 +281,8 @@
 "setDefaultCert" = "從面板設定證書"
 "telegramDesc" = "請提供Telegram聊天ID。（在機器人中使用'/id'命令）或（@userinfobot"
 "subscriptionDesc" = "要找到你的訂閱 URL，請導航到“詳細資訊”。此外，你可以為多個客戶端使用相同的名稱。"
+"shareQuota" = "Share quota across inbounds"
+"shareQuotaDesc" = "Pool totalGB and expiry time with every other client that has the same subId and shareQuota enabled."
 "info" = "資訊"
 "same" = "相同"
 "inboundData" = "入站資料"