diff --git a/cli/aibridged_internal_test.go b/cli/aibridged_internal_test.go
index e2b913dcd5b..d8d02c13146 100644
--- a/cli/aibridged_internal_test.go
+++ b/cli/aibridged_internal_test.go
@@ -24,6 +24,7 @@ import (
 	"github.com/coder/coder/v2/coderd/database/dbtestutil"
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/coder/v2/testutil"
+	"github.com/coder/quartz"
 	"github.com/coder/serpent"
 )
 
@@ -53,7 +54,7 @@ func buildFromEnv(t *testing.T, cfg codersdk.AIBridgeConfig) ([]aibridge.Provide
 // (providers, outcomes) the embedded reloader would observe.
 func buildFromDB(ctx context.Context, t *testing.T, db database.Store, cfg codersdk.AIBridgeConfig, logger slog.Logger) ([]aibridge.Provider, []aibridged.ProviderOutcome, error) {
 	t.Helper()
-	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", cfg, nil, nil, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", cfg, nil, nil, agplaiseats.Noop{}, quartz.NewReal())
 	if err != nil {
 		return nil, nil, err
 	}
diff --git a/coderd/aibridged.go b/coderd/aibridged.go
index 0749bb2cec7..3784545f7c7 100644
--- a/coderd/aibridged.go
+++ b/coderd/aibridged.go
@@ -66,7 +66,7 @@ func (api *API) CreateInMemoryAIBridgeServer(dialCtx context.Context) (client ai
 
 	mux := drpcmux.New()
 	srv, err := aibridgedserver.NewServer(api.ctx, api.Database, api.Pubsub, api.Logger.Named("aibridgedserver"),
-		api.AccessURL.String(), api.DeploymentValues.AI.BridgeConfig, api.ExternalAuthConfigs, api.Experiments, api.AISeatTracker)
+		api.AccessURL.String(), api.DeploymentValues.AI.BridgeConfig, api.ExternalAuthConfigs, api.Experiments, api.AISeatTracker, api.Clock)
 	if err != nil {
 		return nil, err
 	}
diff --git a/coderd/aibridged/http.go b/coderd/aibridged/http.go
index 7c9fef2cd54..0f8c099eaaa 100644
--- a/coderd/aibridged/http.go
+++ b/coderd/aibridged/http.go
@@ -7,16 +7,12 @@ import (
 
 	"github.com/google/uuid"
 	"golang.org/x/xerrors"
-	"google.golang.org/protobuf/types/known/timestamppb"
 
 	"cdr.dev/slog/v3"
 	"github.com/coder/coder/v2/aibridge"
 	"github.com/coder/coder/v2/aibridge/recorder"
 	agplaibridge "github.com/coder/coder/v2/coderd/aibridge"
-	"github.com/coder/coder/v2/coderd/aibridge/budget"
 	"github.com/coder/coder/v2/coderd/aibridged/proto"
-	"github.com/coder/coder/v2/coderd/database/dbtime"
-	"github.com/coder/coder/v2/codersdk"
 )
 
 var _ http.Handler = &Server{}
@@ -149,15 +145,8 @@ func (s *Server) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 	}
 	logger = logger.With(slog.F("user_id", id))
 
-	periodWindow, err := budget.CurrentPeriod(dbtime.Now(), codersdk.AIBudgetPeriodMonth)
-	if err != nil {
-		logger.Warn(ctx, "compute AI budget period", slog.Error(err))
-		http.Error(rw, ErrBudgetCheck.Error(), http.StatusInternalServerError)
-		return
-	}
 	budgetResp, err := client.IsBudgetExceeded(ctx, &proto.IsBudgetExceededRequest{
-		UserId:      id.String(),
-		PeriodStart: timestamppb.New(periodWindow.Start),
+		UserId: id.String(),
 	})
 	if err != nil {
 		logger.Warn(ctx, "user AI budget check failed", slog.Error(err))
diff --git a/coderd/aibridged/proto/aibridged.pb.go b/coderd/aibridged/proto/aibridged.pb.go
index fe68d6ee205..e029c0c3931 100644
--- a/coderd/aibridged/proto/aibridged.pb.go
+++ b/coderd/aibridged/proto/aibridged.pb.go
@@ -1305,8 +1305,6 @@ type IsBudgetExceededRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	UserId string `protobuf:"bytes,1,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"` // UUID
-	// The spend aggregation window is [period_start, now].
-	PeriodStart *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=period_start,json=periodStart,proto3" json:"period_start,omitempty"`
 }
 
 func (x *IsBudgetExceededRequest) Reset() {
@@ -1348,13 +1346,6 @@ func (x *IsBudgetExceededRequest) GetUserId() string {
 	return ""
 }
 
-func (x *IsBudgetExceededRequest) GetPeriodStart() *timestamppb.Timestamp {
-	if x != nil {
-		return x.PeriodStart
-	}
-	return nil
-}
-
 type IsBudgetExceededResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2026,135 +2017,131 @@ var file_coderd_aibridged_proto_aibridged_proto_rawDesc = []byte{
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+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -2224,43 +2211,42 @@ var file_coderd_aibridged_proto_aibridged_proto_depIdxs = []int32{
 	14, // 12: proto.GetMCPServerConfigsResponse.external_auth_mcp_configs:type_name -> proto.MCPServerConfig
 	32, // 13: proto.GetMCPServerAccessTokensBatchResponse.access_tokens:type_name -> proto.GetMCPServerAccessTokensBatchResponse.AccessTokensEntry
 	33, // 14: proto.GetMCPServerAccessTokensBatchResponse.errors:type_name -> proto.GetMCPServerAccessTokensBatchResponse.ErrorsEntry
-	34, // 15: proto.IsBudgetExceededRequest.period_start:type_name -> google.protobuf.Timestamp
-	25, // 16: proto.GetAIProvidersResponse.providers:type_name -> proto.AIProvider
-	26, // 17: proto.AIProvider.bedrock:type_name -> proto.AIProviderKindBedrock
-	35, // 18: proto.RecordInterceptionRequest.MetadataEntry.value:type_name -> google.protobuf.Any
-	35, // 19: proto.RecordTokenUsageRequest.MetadataEntry.value:type_name -> google.protobuf.Any
-	35, // 20: proto.RecordPromptUsageRequest.MetadataEntry.value:type_name -> google.protobuf.Any
-	35, // 21: proto.RecordToolUsageRequest.MetadataEntry.value:type_name -> google.protobuf.Any
-	35, // 22: proto.RecordModelThoughtRequest.MetadataEntry.value:type_name -> google.protobuf.Any
-	0,  // 23: proto.Recorder.RecordInterception:input_type -> proto.RecordInterceptionRequest
-	2,  // 24: proto.Recorder.RecordInterceptionEnded:input_type -> proto.RecordInterceptionEndedRequest
-	4,  // 25: proto.Recorder.RecordTokenUsage:input_type -> proto.RecordTokenUsageRequest
-	6,  // 26: proto.Recorder.RecordPromptUsage:input_type -> proto.RecordPromptUsageRequest
-	8,  // 27: proto.Recorder.RecordToolUsage:input_type -> proto.RecordToolUsageRequest
-	10, // 28: proto.Recorder.RecordModelThought:input_type -> proto.RecordModelThoughtRequest
-	12, // 29: proto.MCPConfigurator.GetMCPServerConfigs:input_type -> proto.GetMCPServerConfigsRequest
-	15, // 30: proto.MCPConfigurator.GetMCPServerAccessTokensBatch:input_type -> proto.GetMCPServerAccessTokensBatchRequest
-	17, // 31: proto.Authorizer.IsAuthorized:input_type -> proto.IsAuthorizedRequest
-	19, // 32: proto.Authorizer.IsBudgetExceeded:input_type -> proto.IsBudgetExceededRequest
-	21, // 33: proto.ProviderConfigurator.GetAIProviders:input_type -> proto.GetAIProvidersRequest
-	23, // 34: proto.ProviderConfigurator.WatchAIProviders:input_type -> proto.WatchAIProvidersRequest
-	1,  // 35: proto.Recorder.RecordInterception:output_type -> proto.RecordInterceptionResponse
-	3,  // 36: proto.Recorder.RecordInterceptionEnded:output_type -> proto.RecordInterceptionEndedResponse
-	5,  // 37: proto.Recorder.RecordTokenUsage:output_type -> proto.RecordTokenUsageResponse
-	7,  // 38: proto.Recorder.RecordPromptUsage:output_type -> proto.RecordPromptUsageResponse
-	9,  // 39: proto.Recorder.RecordToolUsage:output_type -> proto.RecordToolUsageResponse
-	11, // 40: proto.Recorder.RecordModelThought:output_type -> proto.RecordModelThoughtResponse
-	13, // 41: proto.MCPConfigurator.GetMCPServerConfigs:output_type -> proto.GetMCPServerConfigsResponse
-	16, // 42: proto.MCPConfigurator.GetMCPServerAccessTokensBatch:output_type -> proto.GetMCPServerAccessTokensBatchResponse
-	18, // 43: proto.Authorizer.IsAuthorized:output_type -> proto.IsAuthorizedResponse
-	20, // 44: proto.Authorizer.IsBudgetExceeded:output_type -> proto.IsBudgetExceededResponse
-	22, // 45: proto.ProviderConfigurator.GetAIProviders:output_type -> proto.GetAIProvidersResponse
-	24, // 46: proto.ProviderConfigurator.WatchAIProviders:output_type -> proto.WatchAIProvidersResponse
-	35, // [35:47] is the sub-list for method output_type
-	23, // [23:35] is the sub-list for method input_type
-	23, // [23:23] is the sub-list for extension type_name
-	23, // [23:23] is the sub-list for extension extendee
-	0,  // [0:23] is the sub-list for field type_name
+	25, // 15: proto.GetAIProvidersResponse.providers:type_name -> proto.AIProvider
+	26, // 16: proto.AIProvider.bedrock:type_name -> proto.AIProviderKindBedrock
+	35, // 17: proto.RecordInterceptionRequest.MetadataEntry.value:type_name -> google.protobuf.Any
+	35, // 18: proto.RecordTokenUsageRequest.MetadataEntry.value:type_name -> google.protobuf.Any
+	35, // 19: proto.RecordPromptUsageRequest.MetadataEntry.value:type_name -> google.protobuf.Any
+	35, // 20: proto.RecordToolUsageRequest.MetadataEntry.value:type_name -> google.protobuf.Any
+	35, // 21: proto.RecordModelThoughtRequest.MetadataEntry.value:type_name -> google.protobuf.Any
+	0,  // 22: proto.Recorder.RecordInterception:input_type -> proto.RecordInterceptionRequest
+	2,  // 23: proto.Recorder.RecordInterceptionEnded:input_type -> proto.RecordInterceptionEndedRequest
+	4,  // 24: proto.Recorder.RecordTokenUsage:input_type -> proto.RecordTokenUsageRequest
+	6,  // 25: proto.Recorder.RecordPromptUsage:input_type -> proto.RecordPromptUsageRequest
+	8,  // 26: proto.Recorder.RecordToolUsage:input_type -> proto.RecordToolUsageRequest
+	10, // 27: proto.Recorder.RecordModelThought:input_type -> proto.RecordModelThoughtRequest
+	12, // 28: proto.MCPConfigurator.GetMCPServerConfigs:input_type -> proto.GetMCPServerConfigsRequest
+	15, // 29: proto.MCPConfigurator.GetMCPServerAccessTokensBatch:input_type -> proto.GetMCPServerAccessTokensBatchRequest
+	17, // 30: proto.Authorizer.IsAuthorized:input_type -> proto.IsAuthorizedRequest
+	19, // 31: proto.Authorizer.IsBudgetExceeded:input_type -> proto.IsBudgetExceededRequest
+	21, // 32: proto.ProviderConfigurator.GetAIProviders:input_type -> proto.GetAIProvidersRequest
+	23, // 33: proto.ProviderConfigurator.WatchAIProviders:input_type -> proto.WatchAIProvidersRequest
+	1,  // 34: proto.Recorder.RecordInterception:output_type -> proto.RecordInterceptionResponse
+	3,  // 35: proto.Recorder.RecordInterceptionEnded:output_type -> proto.RecordInterceptionEndedResponse
+	5,  // 36: proto.Recorder.RecordTokenUsage:output_type -> proto.RecordTokenUsageResponse
+	7,  // 37: proto.Recorder.RecordPromptUsage:output_type -> proto.RecordPromptUsageResponse
+	9,  // 38: proto.Recorder.RecordToolUsage:output_type -> proto.RecordToolUsageResponse
+	11, // 39: proto.Recorder.RecordModelThought:output_type -> proto.RecordModelThoughtResponse
+	13, // 40: proto.MCPConfigurator.GetMCPServerConfigs:output_type -> proto.GetMCPServerConfigsResponse
+	16, // 41: proto.MCPConfigurator.GetMCPServerAccessTokensBatch:output_type -> proto.GetMCPServerAccessTokensBatchResponse
+	18, // 42: proto.Authorizer.IsAuthorized:output_type -> proto.IsAuthorizedResponse
+	20, // 43: proto.Authorizer.IsBudgetExceeded:output_type -> proto.IsBudgetExceededResponse
+	22, // 44: proto.ProviderConfigurator.GetAIProviders:output_type -> proto.GetAIProvidersResponse
+	24, // 45: proto.ProviderConfigurator.WatchAIProviders:output_type -> proto.WatchAIProvidersResponse
+	34, // [34:46] is the sub-list for method output_type
+	22, // [22:34] is the sub-list for method input_type
+	22, // [22:22] is the sub-list for extension type_name
+	22, // [22:22] is the sub-list for extension extendee
+	0,  // [0:22] is the sub-list for field type_name
 }
 
 func init() { file_coderd_aibridged_proto_aibridged_proto_init() }
diff --git a/coderd/aibridged/proto/aibridged.proto b/coderd/aibridged/proto/aibridged.proto
index 41795abdb9a..1bd3b3f6ffd 100644
--- a/coderd/aibridged/proto/aibridged.proto
+++ b/coderd/aibridged/proto/aibridged.proto
@@ -35,7 +35,7 @@ service Authorizer {
   // TODO: add authorization; currently only key validation takes place.
   rpc IsAuthorized(IsAuthorizedRequest) returns (IsAuthorizedResponse);
   // IsBudgetExceeded reports whether the user's AI spend has reached their
-  // effective limit over [period_start, now].
+  // effective limit for the current deployment-configured budget period.
   rpc IsBudgetExceeded(IsBudgetExceededRequest) returns (IsBudgetExceededResponse);
 }
 
@@ -189,8 +189,6 @@ message IsAuthorizedResponse {
 
 message IsBudgetExceededRequest {
   string user_id = 1; // UUID
-  // The spend aggregation window is [period_start, now].
-  google.protobuf.Timestamp period_start = 2;
 }
 
 message IsBudgetExceededResponse {
diff --git a/coderd/aibridgedserver/aibridgedserver.go b/coderd/aibridgedserver/aibridgedserver.go
index cdfe739d027..af2d790e7ec 100644
--- a/coderd/aibridgedserver/aibridgedserver.go
+++ b/coderd/aibridgedserver/aibridgedserver.go
@@ -33,6 +33,7 @@ import (
 	coderdpubsub "github.com/coder/coder/v2/coderd/pubsub"
 	"github.com/coder/coder/v2/coderd/util/ptr"
 	"github.com/coder/coder/v2/codersdk"
+	"github.com/coder/quartz"
 )
 
 var (
@@ -113,11 +114,15 @@ type Server struct {
 	// budgetPolicy selects the effective group when a user belongs to multiple
 	// budgeted groups, used for cost attribution on token usage records.
 	budgetPolicy codersdk.AIBudgetPolicy
+	// budgetPeriod is the deployment-configured budgeting period used to
+	// derive the window over which user AI spend is aggregated.
+	budgetPeriod codersdk.AIBudgetPeriod
+	clock        quartz.Clock
 }
 
 func NewServer(lifecycleCtx context.Context, store store, ps pubsub.Pubsub, logger slog.Logger, accessURL string,
 	bridgeCfg codersdk.AIBridgeConfig, externalAuthConfigs []*externalauth.Config, experiments codersdk.Experiments,
-	aiSeatTracker aiseats.SeatTracker,
+	aiSeatTracker aiseats.SeatTracker, clock quartz.Clock,
 ) (*Server, error) {
 	eac := make(map[string]*externalauth.Config, len(externalAuthConfigs))
 
@@ -138,6 +143,8 @@ func NewServer(lifecycleCtx context.Context, store store, ps pubsub.Pubsub, logg
 		structuredLogging:   bridgeCfg.StructuredLogging.Value(),
 		aiSeatTracker:       aiSeatTracker,
 		budgetPolicy:        codersdk.NewAIBudgetPolicyFromString(bridgeCfg.BudgetPolicy),
+		budgetPeriod:        codersdk.NewAIBudgetPeriodFromString(bridgeCfg.BudgetPeriod),
+		clock:               clock,
 	}
 
 	if bridgeCfg.InjectCoderMCPTools {
@@ -747,7 +754,8 @@ func (s *Server) IsAuthorized(ctx context.Context, in *proto.IsAuthorizedRequest
 }
 
 // IsBudgetExceeded reports whether the user's AI spend has reached their
-// effective limit over [PeriodStart, now].
+// effective limit over [periodStart, now], where periodStart is the start of
+// the current deployment-configured budget period.
 func (s *Server) IsBudgetExceeded(ctx context.Context, in *proto.IsBudgetExceededRequest) (*proto.IsBudgetExceededResponse, error) {
 	//nolint:gocritic // AIBridged has specific authz rules.
 	ctx = dbauthz.AsAIBridged(ctx)
@@ -756,14 +764,13 @@ func (s *Server) IsBudgetExceeded(ctx context.Context, in *proto.IsBudgetExceede
 	if err != nil {
 		return nil, xerrors.Errorf("invalid user_id %q: %w", in.GetUserId(), err)
 	}
-	// An unset PeriodStart deserializes to time.Unix(0, 0), which would
-	// incorrectly aggregate the user's lifetime spend against a period budget.
-	if in.PeriodStart == nil {
-		return nil, xerrors.New("period_start is required")
+
+	periodWindow, err := budget.CurrentPeriod(s.clock.Now(), s.budgetPeriod)
+	if err != nil {
+		return nil, xerrors.Errorf("compute AI budget period: %w", err)
 	}
-	periodStart := in.GetPeriodStart().AsTime()
 
-	userBudget, err := s.checkUserAIBudget(ctx, userID, periodStart)
+	userBudget, err := s.checkUserAIBudget(ctx, userID, periodWindow.Start)
 	if err != nil {
 		return nil, err
 	}
diff --git a/coderd/aibridgedserver/aibridgedserver_test.go b/coderd/aibridgedserver/aibridgedserver_test.go
index b4eec74b663..e5b71803eb9 100644
--- a/coderd/aibridgedserver/aibridgedserver_test.go
+++ b/coderd/aibridgedserver/aibridgedserver_test.go
@@ -29,7 +29,6 @@ import (
 	"cdr.dev/slog/v3"
 	"cdr.dev/slog/v3/sloggers/slogjson"
 	"cdr.dev/slog/v3/sloggers/slogtest"
-	"github.com/coder/coder/v2/coderd/aibridge/budget"
 	"github.com/coder/coder/v2/coderd/aibridged"
 	"github.com/coder/coder/v2/coderd/aibridged/proto"
 	"github.com/coder/coder/v2/coderd/aibridgedserver"
@@ -51,6 +50,7 @@ import (
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/coder/v2/cryptorand"
 	"github.com/coder/coder/v2/testutil"
+	"github.com/coder/quartz"
 	"github.com/coder/serpent"
 )
 
@@ -209,7 +209,7 @@ func TestAuthorization(t *testing.T) {
 				tc.mocksFn(db, apiKey, user)
 			}
 
-			srv, err := aibridgedserver.NewServer(t.Context(), db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{})
+			srv, err := aibridgedserver.NewServer(t.Context(), db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 			require.NoError(t, err)
 			require.NotNil(t, srv)
 
@@ -371,7 +371,7 @@ func TestAuthorization_Delegated(t *testing.T) {
 				tc.mocksFn(db, apiKey, user)
 			}
 
-			srv, err := aibridgedserver.NewServer(t.Context(), db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{})
+			srv, err := aibridgedserver.NewServer(t.Context(), db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 			require.NoError(t, err)
 			require.NotNil(t, srv)
 
@@ -402,7 +402,6 @@ func TestIsBudgetExceeded(t *testing.T) {
 	cases := []struct {
 		name            string
 		userIDStr       string
-		omitPeriodStart bool
 		setupMocks      func(db *dbmock.MockStore, userID uuid.UUID) *proto.IsBudgetExceededResponse
 		wantErrContains string
 	}{
@@ -412,12 +411,6 @@ func TestIsBudgetExceeded(t *testing.T) {
 			userIDStr:       "not-a-uuid",
 			wantErrContains: "invalid user_id",
 		},
-		{
-			// Missing period_start is rejected before any store call.
-			name:            "missing period_start",
-			omitPeriodStart: true,
-			wantErrContains: "period_start is required",
-		},
 		{
 			// No override and no group budget resolves: pass-through.
 			name: "no budget configured returns not exceeded",
@@ -567,15 +560,10 @@ func TestIsBudgetExceeded(t *testing.T) {
 				wantResp = tc.setupMocks(db, userID)
 			}
 
-			srv, err := aibridgedserver.NewServer(t.Context(), db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{})
+			srv, err := aibridgedserver.NewServer(t.Context(), db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 			require.NoError(t, err)
 
 			req := &proto.IsBudgetExceededRequest{UserId: userIDStr}
-			if !tc.omitPeriodStart {
-				window, err := budget.CurrentPeriod(dbtime.Now(), codersdk.AIBudgetPeriodMonth)
-				require.NoError(t, err)
-				req.PeriodStart = timestamppb.New(window.Start)
-			}
 			resp, err := srv.IsBudgetExceeded(t.Context(), req)
 			if tc.wantErrContains != "" {
 				require.Error(t, err)
@@ -599,7 +587,7 @@ func TestIsBudgetExceeded_Enforcement(t *testing.T) {
 	const groupLimitMicros = 1_000_000
 
 	// setup provisions a user in an organization with a single budgeted group.
-	setup := func(t *testing.T) (context.Context, database.Store, *aibridgedserver.Server, database.User, database.Group) {
+	setup := func(t *testing.T, clock quartz.Clock) (context.Context, database.Store, *aibridgedserver.Server, database.User, database.Group) {
 		t.Helper()
 
 		ctx := testutil.Context(t, testutil.WaitLong)
@@ -620,7 +608,7 @@ func TestIsBudgetExceeded_Enforcement(t *testing.T) {
 		})
 		require.NoError(t, err)
 
-		srv, err := aibridgedserver.NewServer(ctx, authzDB, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{})
+		srv, err := aibridgedserver.NewServer(ctx, authzDB, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{}, clock)
 		require.NoError(t, err)
 
 		return ctx, rawDB, srv, user, group
@@ -628,59 +616,68 @@ func TestIsBudgetExceeded_Enforcement(t *testing.T) {
 
 	t.Run("period boundary excludes prior period spend", func(t *testing.T) {
 		t.Parallel()
-		ctx, rawDB, srv, user, group := setup(t)
 
-		prevMonth := time.Date(2026, time.January, 1, 0, 0, 0, 0, time.UTC)
-		newMonth := time.Date(2026, time.February, 1, 0, 0, 0, 0, time.UTC)
+		// Use fixed dates to keep the test deterministic.
+		clock := quartz.NewMock(t)
+		ctx, rawDB, srv, user, group := setup(t, clock)
 
-		// User spend on 2026-01-15.
+		prevMonth := time.Date(2026, time.January, 15, 0, 0, 0, 0, time.UTC)
+		nextMonth := time.Date(2026, time.February, 5, 0, 0, 0, 0, time.UTC)
+
+		// Set now to 2026-01-15.
+		clock.Set(prevMonth)
+
+		// User spend on 2026-01-15 exceeds the group limit.
 		_, err := rawDB.IncrementUserAIDailySpend(ctx, database.IncrementUserAIDailySpendParams{
 			UserID:           user.ID,
 			EffectiveGroupID: group.ID,
-			Day:              prevMonth.AddDate(0, 0, 14),
+			Day:              prevMonth,
 			CostMicros:       1_500_000,
 		})
 		require.NoError(t, err)
 
-		// Query with period_start 2026-01-01: includes the 2026-01-15 spend, user exceeded.
+		// Current period is January: includes the 2026-01-15 spend, user exceeded.
 		prevMonthResp, err := srv.IsBudgetExceeded(ctx, &proto.IsBudgetExceededRequest{
-			UserId:      user.ID.String(),
-			PeriodStart: timestamppb.New(prevMonth),
+			UserId: user.ID.String(),
 		})
 		require.NoError(t, err)
 		require.True(t, prevMonthResp.GetExceeded())
 		require.Equal(t, int64(groupLimitMicros), prevMonthResp.GetSpendLimitMicros())
 
-		// Query with period_start 2026-02-01: excludes the 2026-01-15 spend, user not exceeded.
-		newMonthResp, err := srv.IsBudgetExceeded(ctx, &proto.IsBudgetExceededRequest{
-			UserId:      user.ID.String(),
-			PeriodStart: timestamppb.New(newMonth),
+		// Advance clock to 2026-02-05: excludes the 2026-01-15 spend, user not exceeded.
+		clock.Set(nextMonth)
+		nextMonthResp, err := srv.IsBudgetExceeded(ctx, &proto.IsBudgetExceededRequest{
+			UserId: user.ID.String(),
 		})
 		require.NoError(t, err)
-		require.False(t, newMonthResp.GetExceeded())
-		require.Equal(t, int64(groupLimitMicros), newMonthResp.GetSpendLimitMicros())
+		require.False(t, nextMonthResp.GetExceeded())
+		require.Equal(t, int64(groupLimitMicros), nextMonthResp.GetSpendLimitMicros())
 	})
 
 	t.Run("new user override unblocks user", func(t *testing.T) {
 		t.Parallel()
-		ctx, rawDB, srv, user, group := setup(t)
 
 		// Use fixed dates to keep the test deterministic.
-		periodStart := time.Date(2026, time.March, 1, 0, 0, 0, 0, time.UTC)
+		clock := quartz.NewMock(t)
+		ctx, rawDB, srv, user, group := setup(t, clock)
+
+		now := time.Date(2026, time.March, 15, 0, 0, 0, 0, time.UTC)
+
+		// Set now to 2026-03-15.
+		clock.Set(now)
 
-		// User spend on 2026-03-15.
+		// User spend on 2026-03-15 exceeds the group limit.
 		_, err := rawDB.IncrementUserAIDailySpend(ctx, database.IncrementUserAIDailySpendParams{
 			UserID:           user.ID,
 			EffectiveGroupID: group.ID,
-			Day:              periodStart.AddDate(0, 0, 14),
+			Day:              now,
 			CostMicros:       1_500_000,
 		})
 		require.NoError(t, err)
 
 		// User's spend exceeds the group limit.
 		beforeResp, err := srv.IsBudgetExceeded(ctx, &proto.IsBudgetExceededRequest{
-			UserId:      user.ID.String(),
-			PeriodStart: timestamppb.New(periodStart),
+			UserId: user.ID.String(),
 		})
 		require.NoError(t, err)
 		require.True(t, beforeResp.GetExceeded())
@@ -697,8 +694,7 @@ func TestIsBudgetExceeded_Enforcement(t *testing.T) {
 		require.NoError(t, err)
 
 		afterResp, err := srv.IsBudgetExceeded(ctx, &proto.IsBudgetExceededRequest{
-			UserId:      user.ID.String(),
-			PeriodStart: timestamppb.New(periodStart),
+			UserId: user.ID.String(),
 		})
 		require.NoError(t, err)
 		require.False(t, afterResp.GetExceeded())
@@ -777,7 +773,7 @@ func TestGetMCPServerConfigs(t *testing.T) {
 			accessURL := "https://my-cool-deployment.com"
 			srv, err := aibridgedserver.NewServer(t.Context(), db, nil, logger, accessURL, codersdk.AIBridgeConfig{
 				InjectCoderMCPTools: serpent.Bool(!tc.disableCoderMCPInjection),
-			}, tc.externalAuthConfigs, tc.experiments, agplaiseats.Noop{})
+			}, tc.externalAuthConfigs, tc.experiments, agplaiseats.Noop{}, quartz.NewReal())
 			require.NoError(t, err)
 			require.NotNil(t, srv)
 
@@ -827,7 +823,7 @@ func TestGetMCPServerAccessTokensBatch(t *testing.T) {
 		{
 			ID: "3",
 		},
-	}, requiredExperiments, agplaiseats.Noop{})
+	}, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 	require.NotNil(t, srv)
 
@@ -2104,7 +2100,7 @@ func TestRecordTokenUsageAuthorized(t *testing.T) {
 	now := time.Date(2026, 6, 25, 14, 30, 0, 0, time.UTC)
 
 	// The server runs every store call as subjectAibridged via the authzDB.
-	srv, err := aibridgedserver.NewServer(ctx, authzDB, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(ctx, authzDB, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 
 	_, err = srv.RecordTokenUsage(ctx, &proto.RecordTokenUsageRequest{
@@ -2479,7 +2475,7 @@ func testRecordMethod[Req any, Resp any](
 			}
 
 			ctx := testutil.Context(t, testutil.WaitLong)
-			srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{})
+			srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 			require.NoError(t, err)
 
 			resp, err := callMethod(srv, ctx, tc.request)
@@ -2801,7 +2797,7 @@ func TestStructuredLogging(t *testing.T) {
 			ctx := testutil.Context(t, testutil.WaitLong)
 			srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{
 				StructuredLogging: serpent.Bool(tc.structuredLogging),
-			}, nil, requiredExperiments, agplaiseats.Noop{})
+			}, nil, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 			require.NoError(t, err)
 
 			err = tc.recordFn(srv, ctx, interceptionID)
@@ -2843,7 +2839,7 @@ func TestInferredThreadsByToolCalls(t *testing.T) {
 
 	user := dbgen.User(t, db, database.User{})
 
-	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 
 	aID := uuid.New()
@@ -2939,7 +2935,7 @@ func TestRecordToolUsageProviderItemID(t *testing.T) {
 
 	user := dbgen.User(t, db, database.User{})
 
-	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, requiredExperiments, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 
 	intcID := uuid.New()
@@ -3069,7 +3065,7 @@ func TestGetAIProviders(t *testing.T) {
 		Settings: sql.NullString{String: "{not valid json", Valid: true},
 	})
 
-	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 
 	resp, err := srv.GetAIProviders(ctx, &proto.GetAIProvidersRequest{})
@@ -3132,7 +3128,7 @@ func TestGetAIProvidersBlocksOnSeedLock(t *testing.T) {
 		BaseUrl: "https://api.openai.com/",
 	}, "sk-openai")
 
-	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(ctx, db, nil, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 
 	// Simulate an in-flight env seed holding the advisory lock until released.
@@ -3213,7 +3209,7 @@ func TestWatchAIProviders(t *testing.T) {
 	// In-memory pubsub delivers Publish synchronously for deterministic signals.
 	ps := pubsub.NewInMemory()
 
-	srv, err := aibridgedserver.NewServer(ctx, db, ps, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(ctx, db, ps, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 
 	streamCtx, streamCancel := context.WithCancel(ctx)
@@ -3251,7 +3247,7 @@ func TestWatchAIProvidersSignalsOnDeliveryError(t *testing.T) {
 	logger := slogtest.Make(t, nil)
 	ps := &captureListenerPubsub{listenerC: make(chan pubsub.ListenerWithErr, 1)}
 
-	srv, err := aibridgedserver.NewServer(ctx, db, ps, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(ctx, db, ps, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 
 	streamCtx, streamCancel := context.WithCancel(ctx)
@@ -3293,7 +3289,7 @@ func TestWatchAIProvidersStopsOnLifecycleCancel(t *testing.T) {
 	// canceled while the stream stays open.
 	lifecycleCtx, lifecycleCancel := context.WithCancel(ctx)
 	defer lifecycleCancel()
-	srv, err := aibridgedserver.NewServer(lifecycleCtx, db, ps, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{})
+	srv, err := aibridgedserver.NewServer(lifecycleCtx, db, ps, logger, "/", codersdk.AIBridgeConfig{}, nil, nil, agplaiseats.Noop{}, quartz.NewReal())
 	require.NoError(t, err)
 
 	streamCtx, streamCancel := context.WithCancel(ctx)
diff --git a/codersdk/deployment.go b/codersdk/deployment.go
index 2edd295dbc6..8658ef35039 100644
--- a/codersdk/deployment.go
+++ b/codersdk/deployment.go
@@ -612,6 +612,15 @@ var AIBudgetPeriods = []string{
 	string(AIBudgetPeriodMonth),
 }
 
+// NewAIBudgetPeriodFromString converts s to an AIBudgetPeriod, falling back to
+// AIBudgetPeriodMonth when s is empty or not a recognized period.
+func NewAIBudgetPeriodFromString(s string) AIBudgetPeriod {
+	if slices.Contains(AIBudgetPeriods, s) {
+		return AIBudgetPeriod(s)
+	}
+	return AIBudgetPeriodMonth
+}
+
 // DeploymentValues is the central configuration values the coder server.
 type DeploymentValues struct {
 	Verbose             serpent.Bool   `json:"verbose,omitempty"`
diff --git a/enterprise/coderd/aibridge.go b/enterprise/coderd/aibridge.go
index 8736088a803..ac6b3d80fe1 100644
--- a/enterprise/coderd/aibridge.go
+++ b/enterprise/coderd/aibridge.go
@@ -890,7 +890,8 @@ func (api *API) userAISpendStatus(rw http.ResponseWriter, r *http.Request) {
 	user := httpmw.UserParam(r)
 	logger := api.Logger.With(slog.F("user_id", user.ID))
 
-	periodWindow, err := budget.CurrentPeriod(api.Clock.Now(), codersdk.AIBudgetPeriodMonth)
+	period := codersdk.NewAIBudgetPeriodFromString(api.DeploymentValues.AI.BridgeConfig.BudgetPeriod)
+	periodWindow, err := budget.CurrentPeriod(api.Clock.Now(), period)
 	if err != nil {
 		logger.Error(ctx, "failed to compute AI budget period", slog.Error(err))
 		httpapi.InternalServerError(rw, err)
diff --git a/enterprise/coderd/aibridgeserve.go b/enterprise/coderd/aibridgeserve.go
index 08b86f4cd62..8e90ae6e71a 100644
--- a/enterprise/coderd/aibridgeserve.go
+++ b/enterprise/coderd/aibridgeserve.go
@@ -144,6 +144,7 @@ func (api *API) aiGatewayServe(rw http.ResponseWriter, r *http.Request) {
 		api.ExternalAuthConfigs,
 		api.AGPL.Experiments,
 		api.AGPL.AISeatTracker,
+		api.AGPL.Clock,
 	)
 	if err != nil {
 		if !xerrors.Is(err, context.Canceled) {