diff --git a/src/time-and-attendance/expenses/expense.controller.ts b/src/time-and-attendance/expenses/expense.controller.ts
index 737228e..d910ad4 100644
--- a/src/time-and-attendance/expenses/expense.controller.ts
+++ b/src/time-and-attendance/expenses/expense.controller.ts
@@ -35,8 +35,11 @@ export class ExpenseController {
 
     @Delete('delete/:expense_id')
     @ModuleAccessAllowed(ModulesEnum.timesheets)
-    remove(@Param('expense_id') expense_id: number): Promise<Result<number, string>> {
-        return this.deleteService.deleteExpense(expense_id);
+    remove(
+        @Param('expense_id') expense_id: number,
+        @Access('email') email: string,
+    ): Promise<Result<number, string>> {
+        return this.deleteService.deleteExpense(expense_id, email);
     }
 }
 
diff --git a/src/time-and-attendance/expenses/services/expense-create.service.ts b/src/time-and-attendance/expenses/services/expense-create.service.ts
index 6222c83..298c58c 100644
--- a/src/time-and-attendance/expenses/services/expense-create.service.ts
+++ b/src/time-and-attendance/expenses/services/expense-create.service.ts
@@ -6,6 +6,7 @@ import { toStringFromDate, weekStartSunday } from "src/common/utils/date-utils";
 import { PrismaService } from "src/prisma/prisma.service";
 import { ExpenseDto } from "src/time-and-attendance/expenses/expense-create.dto";
 import { normalizeAndParseExpenseDto } from "src/time-and-attendance/expenses/expense.utils";
+import { PayPeriodEventService } from "src/time-and-attendance/pay-period/services/pay-period-event.service";
 import { expense_select } from "src/time-and-attendance/utils/selects.utils";
 
 @Injectable()
@@ -14,6 +15,7 @@ export class ExpenseCreateService {
         private readonly prisma: PrismaService,
         private readonly emailResolver: EmailToIdResolver,
         private readonly typeResolver: BankCodesResolver,
+        private readonly payPeriodEventService: PayPeriodEventService,
     ) { }
 
     //_________________________________________________________________
@@ -64,8 +66,15 @@ export class ExpenseCreateService {
                 attachment: expense.attachment ?? undefined,
                 supervisor_comment: expense.supervisor_comment ?? undefined,
             };
-            return { success: true, data: created };
 
+            // notify timesheet approval observers of changes
+            this.payPeriodEventService.emit({
+                employee_email: email,
+                event_type: 'expense',
+                action: 'create',
+            });
+
+            return { success: true, data: created };
         } catch (error) {
             return { success: false, error: 'INVALID_EXPENSE' };
         }
diff --git a/src/time-and-attendance/expenses/services/expense-delete.service.ts b/src/time-and-attendance/expenses/services/expense-delete.service.ts
index 9ad7dd8..01c3bfc 100644
--- a/src/time-and-attendance/expenses/services/expense-delete.service.ts
+++ b/src/time-and-attendance/expenses/services/expense-delete.service.ts
@@ -1,15 +1,40 @@
 import { Injectable } from "@nestjs/common";
 import { Result } from "src/common/errors/result-error.factory";
+import { EmailToIdResolver } from "src/common/mappers/email-id.mapper";
 import { PrismaService } from "src/prisma/prisma.service";
+import { PayPeriodEventService } from "src/time-and-attendance/pay-period/services/pay-period-event.service";
 
 @Injectable()
 export class ExpenseDeleteService {
-    constructor(private readonly prisma: PrismaService) { }
+    constructor(
+        private readonly prisma: PrismaService,
+        private readonly payPeriodEventService: PayPeriodEventService,
+        private readonly emailResolver: EmailToIdResolver,
+    ){}
 
     //_________________________________________________________________
     //                              DELETE
     //_________________________________________________________________
-    async deleteExpense(expense_id: number): Promise<Result<number, string>> {
+    async deleteExpense(expense_id: number, email: string): Promise<Result<number, string>> {
+        // get employee id of employee who made delete request
+        const employee = await this.emailResolver.findIdByEmail(email);
+
+        if (!employee.success) return employee;
+
+        // confirm ownership of expense to employee who made request
+        const expense = await this.prisma.expenses.findUnique({
+            where: { id: expense_id},
+            select: {
+                timesheet: {
+                    select: {
+                        employee_id: true,
+                    }
+                }
+            }
+        });
+
+        if (!expense || expense.timesheet.employee_id !== employee.data) return { success: false, error: 'EXPENSE_NOT_FOUND'};
+
         try {
             await this.prisma.$transaction(async (tx) => {
                 const expense = await tx.expenses.findUnique({
@@ -21,6 +46,14 @@ export class ExpenseDeleteService {
                 await tx.expenses.delete({ where: { id: expense.id } });
                 return { success: true, data: expense.id };
             });
+
+            // notify timesheet-approval observers of changes
+            this.payPeriodEventService.emit({
+                employee_email: email,
+                event_type: 'expense',
+                action: 'delete',
+            });
+
             return { success: true, data: expense_id };
         } catch (error) {
             return { success: false, error: `EXPENSE_NOT_FOUND` };
diff --git a/src/time-and-attendance/expenses/services/expense-update.service.ts b/src/time-and-attendance/expenses/services/expense-update.service.ts
index 3f2e1e5..a5af26a 100644
--- a/src/time-and-attendance/expenses/services/expense-update.service.ts
+++ b/src/time-and-attendance/expenses/services/expense-update.service.ts
@@ -8,6 +8,7 @@ import { BankCodesResolver } from "src/common/mappers/bank-type-id.mapper";
 import { ExpenseDto } from "src/time-and-attendance/expenses/expense-create.dto";
 import { Prisma } from "@prisma/client";
 import { normalizeAndParseExpenseDto } from "src/time-and-attendance/expenses/expense.utils";
+import { PayPeriodEventService } from "src/time-and-attendance/pay-period/services/pay-period-event.service";
 
 @Injectable()
 export class ExpenseUpdateService {
@@ -15,6 +16,7 @@ export class ExpenseUpdateService {
         private readonly prisma: PrismaService,
         private readonly emailResolver: EmailToIdResolver,
         private readonly typeResolver: BankCodesResolver,
+        private readonly payPeriodEventService: PayPeriodEventService,
     ) { }
     //_________________________________________________________________
     //                              UPDATE
@@ -66,6 +68,17 @@ export class ExpenseUpdateService {
                 attachment: expense.attachment ?? undefined,
                 supervisor_comment: expense.supervisor_comment ?? undefined,
             };
+
+            // notify timesheet-approval observers of changes, but only if it came
+            // from timesheet and not timesheet-approval (no employee_email)
+            if (!employee_email) {
+                this.payPeriodEventService.emit({
+                    employee_email: email,
+                    event_type: 'expense',
+                    action: 'update',
+                });
+            }
+
             return { success: true, data: updated };
         } catch (error) {
             return { success: false, error: 'EXPENSE_NOT_FOUND' };
diff --git a/src/time-and-attendance/pay-period/dtos/pay-period-event.dto.ts b/src/time-and-attendance/pay-period/dtos/pay-period-event.dto.ts
index 4bf21a0..89faff2 100644
--- a/src/time-and-attendance/pay-period/dtos/pay-period-event.dto.ts
+++ b/src/time-and-attendance/pay-period/dtos/pay-period-event.dto.ts
@@ -1,5 +1,5 @@
 export class PayPeriodEvent {
     employee_email: string;
-    event_type: 'expense' | 'shift';
+    event_type: 'expense' | 'shift' | 'preset';
     action: 'create' | 'update' | 'delete';
 }
\ No newline at end of file
diff --git a/src/time-and-attendance/schedule-presets/schedule-presets.module.ts b/src/time-and-attendance/schedule-presets/schedule-presets.module.ts
index 56beb0a..04085d6 100644
--- a/src/time-and-attendance/schedule-presets/schedule-presets.module.ts
+++ b/src/time-and-attendance/schedule-presets/schedule-presets.module.ts
@@ -13,6 +13,7 @@ import { ShiftsCreateService } from "src/time-and-attendance/shifts/services/shi
 import { VacationService } from "src/time-and-attendance/domains/services/vacation.service";
 import { SickLeaveService } from "src/time-and-attendance/domains/services/sick-leave.service";
 import { BankedHoursService } from "src/time-and-attendance/domains/services/banking-hours.service";
+import { PayPeriodEventService } from "../pay-period/services/pay-period-event.service";
 
 
 
@@ -30,6 +31,7 @@ import { BankedHoursService } from "src/time-and-attendance/domains/services/ban
         VacationService,
         SickLeaveService,
         BankedHoursService,
+        PayPeriodEventService,
     ],
     exports: [
         SchedulePresetsGetService,
diff --git a/src/time-and-attendance/schedule-presets/services/schedule-presets-apply.service.ts b/src/time-and-attendance/schedule-presets/services/schedule-presets-apply.service.ts
index 668418a..97ad01c 100644
--- a/src/time-and-attendance/schedule-presets/services/schedule-presets-apply.service.ts
+++ b/src/time-and-attendance/schedule-presets/services/schedule-presets-apply.service.ts
@@ -11,6 +11,7 @@ import { timesheet_select } from "src/time-and-attendance/utils/selects.utils";
 import { ShiftDto } from "src/time-and-attendance/shifts/shift.dto";
 import { WEEKDAY_MAP } from "src/time-and-attendance/schedule-presets/schedule-presets.dto";
 import { $Enums, Prisma, SchedulePresetShifts } from "@prisma/client";
+import { PayPeriodEventService } from "src/time-and-attendance/pay-period/services/pay-period-event.service";
 
 
 @Injectable()
@@ -20,6 +21,7 @@ export class SchedulePresetsApplyService {
         private readonly emailResolver: EmailToIdResolver,
         private readonly shiftService: ShiftsCreateService,
         private readonly typeResolver: BankCodesResolver,
+        private readonly payPeriodEventService: PayPeriodEventService,
     ) { }
 
     async applyPresetToTimesheet(email: string, timesheet_id: number): Promise<Result<boolean, string>> {
@@ -119,6 +121,14 @@ export class SchedulePresetsApplyService {
             
             await this.shiftService.createShift(employee_id.data, created_shift.data);
         }
+
+        // notify timesheet-approval observers of changes
+        this.payPeriodEventService.emit({
+            employee_email: email,
+            event_type: 'preset',
+            action: 'create',
+        })
+
         return { success: true, data: true };
     }
 
diff --git a/src/time-and-attendance/shifts/services/shifts-update.service.ts b/src/time-and-attendance/shifts/services/shifts-update.service.ts
index 75c1b09..dcaaf3d 100644
--- a/src/time-and-attendance/shifts/services/shifts-update.service.ts
+++ b/src/time-and-attendance/shifts/services/shifts-update.service.ts
@@ -61,7 +61,7 @@ export class ShiftsUpdateService {
                 this.payPeriodEventService.emit({
                     employee_email: email,
                     event_type: 'shift',
-                    action: 'create'
+                    action: 'update'
                 })
             }
 
diff --git a/src/time-and-attendance/time-and-attendance.module.ts b/src/time-and-attendance/time-and-attendance.module.ts
index c5d1420..7b7696c 100644
--- a/src/time-and-attendance/time-and-attendance.module.ts
+++ b/src/time-and-attendance/time-and-attendance.module.ts
@@ -43,6 +43,7 @@ import { SchedulePresetDeleteService } from "src/time-and-attendance/schedule-pr
 import { SchedulePresetUpdateService } from "src/time-and-attendance/schedule-presets/services/schedule-presets-update.service";
 import { SchedulePresetsCreateService } from "src/time-and-attendance/schedule-presets/services/schedule-presets-create.service";
 import { SchedulePresetsApplyService } from "src/time-and-attendance/schedule-presets/services/schedule-presets-apply.service";
+import { PayPeriodEventService } from "./pay-period/services/pay-period-event.service";
 
 
 @Module({
@@ -90,6 +91,7 @@ import { SchedulePresetsApplyService } from "src/time-and-attendance/schedule-pr
         VacationService,
         BankedHoursService,
         PaidTimeOFfBankHoursService,
+        PayPeriodEventService,
     ],
     exports: [TimesheetApprovalService],
 }) export class TimeAndAttendanceModule { };
\ No newline at end of file