diff --git a/database/migrations/.snapshot-dzone-db.json b/database/migrations/.snapshot-dzone-db.json
index af2c0be..9a22717 100644
--- a/database/migrations/.snapshot-dzone-db.json
+++ b/database/migrations/.snapshot-dzone-db.json
@@ -321,6 +321,15 @@
           "length": 6,
           "mappedType": "datetime"
         },
+        "title": {
+          "name": "title",
+          "type": "text",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "mappedType": "text"
+        },
         "type": {
           "name": "type",
           "type": "text",
diff --git a/database/migrations/Migration20250218120000_add_bill_title.ts b/database/migrations/Migration20250218120000_add_bill_title.ts
new file mode 100644
index 0000000..3b19ca0
--- /dev/null
+++ b/database/migrations/Migration20250218120000_add_bill_title.ts
@@ -0,0 +1,12 @@
+import { Migration } from "@mikro-orm/migrations";
+
+export class Migration20250218120000_add_bill_title extends Migration {
+  override async up(): Promise<void> {
+    this.addSql(`alter table "bill" add column "title" text not null default '';`);
+    this.addSql(`alter table "bill" alter column "title" drop default;`);
+  }
+
+  override async down(): Promise<void> {
+    this.addSql(`alter table "bill" drop column "title";`);
+  }
+}
diff --git a/src/modules/bills/bills.service.ts b/src/modules/bills/bills.service.ts
index 2194957..7c63c56 100644
--- a/src/modules/bills/bills.service.ts
+++ b/src/modules/bills/bills.service.ts
@@ -24,6 +24,9 @@ import { IFile } from "../utils/interfaces/IFile";
 
 @Injectable()
 export class BillsService {
+  readonly SEWAGE_RATE = 0.3;
+  readonly TAX_RATE = 0.1;
+
   constructor(
     private readonly em: EntityManager,
     private readonly companiesService: CompaniesService,
@@ -40,7 +43,7 @@ export class BillsService {
     try {
       await em.begin();
 
-      const bill = em.create(Bill, { type: BillType.WATER_BILL, business });
+      const bill = em.create(Bill, { type: BillType.WATER_BILL, business, title: dto.title });
       em.persist(bill);
       const dueDate = dayjs().add(dueDays, "day").toDate();
 
@@ -50,10 +53,10 @@ export class BillsService {
 
       for (const value of values) {
         const waterCost = new Decimal(waterRate).mul(value.waterUsage);
-        const sewageCost = waterCost.mul(0.3);
+        const sewageCost = waterCost.mul(this.SEWAGE_RATE);
         const subtotal = waterCost.plus(sewageCost);
 
-        const tax = subtotal.mul(0.1);
+        const tax = subtotal.mul(this.TAX_RATE);
         const totalPrice = subtotal.plus(tax);
         const company = companyMap.get(value.companyId);
         if (!company) {
@@ -72,7 +75,7 @@ export class BillsService {
 
         const invoiceItem = em.create(InvoiceItem, {
           name: "قبض آب",
-          count: value.waterUsage,
+          count: 1,
           unitPrice: totalPrice,
           discount: new Decimal(0),
           totalPrice,
@@ -83,9 +86,13 @@ export class BillsService {
         em.persist(invoice);
       }
 
-      await em.flush();
       await em.commit();
 
+      // Ensure bill.id is available
+      if (!bill.id) {
+        await em.refresh(bill);
+      }
+
       await this.addInvoiceReminderJobs(bill.id);
 
       return bill;
@@ -159,7 +166,7 @@ export class BillsService {
     try {
       await em.begin();
 
-      const bill = em.create(Bill, { type: BillType.MONTHLY_CHARGE, business });
+      const bill = em.create(Bill, { type: BillType.MONTHLY_CHARGE, business, title: dto.title });
       em.persist(bill);
       const dueDate = dayjs().add(dueDays, "day").toDate();
 
@@ -192,8 +199,11 @@ export class BillsService {
         em.persist(invoice);
       }
 
-      await em.flush();
       await em.commit();
+      // Ensure bill.id is available
+      if (!bill.id) {
+        await em.refresh(bill);
+      }
 
       await this.addInvoiceReminderJobs(bill.id);
 
diff --git a/src/modules/bills/dto/create-charge-bill.dto.ts b/src/modules/bills/dto/create-charge-bill.dto.ts
index 31a656a..2276745 100644
--- a/src/modules/bills/dto/create-charge-bill.dto.ts
+++ b/src/modules/bills/dto/create-charge-bill.dto.ts
@@ -1,7 +1,12 @@
 import { ApiProperty } from "@nestjs/swagger";
-import { IsInt } from "class-validator";
+import { IsInt, IsNotEmpty, IsString } from "class-validator";
 
 export class CreateChargeBillDto {
+  @ApiProperty({ description: "Bill title" })
+  @IsString()
+  @IsNotEmpty()
+  title: string;
+
   @ApiProperty()
   @IsInt()
   chargeRate: number;
diff --git a/src/modules/bills/dto/create-water-bill.dto.ts b/src/modules/bills/dto/create-water-bill.dto.ts
index 89c59e2..52413e1 100644
--- a/src/modules/bills/dto/create-water-bill.dto.ts
+++ b/src/modules/bills/dto/create-water-bill.dto.ts
@@ -1,6 +1,6 @@
 import { ApiProperty } from "@nestjs/swagger";
 import { Type } from "class-transformer";
-import { ArrayMinSize, IsArray, IsInt, IsNotEmpty, IsUUID, ValidateNested } from "class-validator";
+import { ArrayMinSize, IsArray, IsInt, IsNotEmpty, IsString, IsUUID, ValidateNested } from "class-validator";
 
 export class ValueDto {
   @IsNotEmpty({ message: " BillMessage.COMPANY_ID_REQUIRED" })
@@ -16,6 +16,11 @@ export class ValueDto {
 }
 
 export class CreateWaterBillDto {
+  @ApiProperty({ description: "Bill title" })
+  @IsString()
+  @IsNotEmpty()
+  title: string;
+
   @ApiProperty()
   @IsInt()
   waterRate: number;
@@ -33,6 +38,11 @@ export class CreateWaterBillDto {
 }
 
 export class CreateWaterBillFromExcelDto {
+  @ApiProperty({ description: "Bill title" })
+  @IsString()
+  @IsNotEmpty()
+  title: string;
+
   @ApiProperty()
   @Type(() => Number)
   @IsInt()
diff --git a/src/modules/bills/entities/bill.entity.ts b/src/modules/bills/entities/bill.entity.ts
index 6784a27..c226f97 100644
--- a/src/modules/bills/entities/bill.entity.ts
+++ b/src/modules/bills/entities/bill.entity.ts
@@ -8,6 +8,9 @@ import { BillsRepository } from "../repositories/bill.repository";
 
 @Entity({ repository: () => BillsRepository })
 export class Bill extends BaseEntity {
+  @Property({ columnType: "text" })
+  title!: string;
+
   @Enum({ items: () => BillType })
   type: BillType;