Sale Invoice

Sale Invoices are simplified invoices for B2C retail transactions where buyer tax information is not required.

Overview

Attribute	Value
Service	SaleInvoiceService
Tax Deductible	No
Buyer Info	Optional
CQT Submission	Required

When to Use

• Retail sales to individual consumers
• Customer doesn't need tax deduction
• Quick checkout scenarios
• Anonymous sales

Required Fields

{
  // Seller (your company)
  seller: {
    taxCode: '0123456789',
    name: 'Your Company',
    address: '123 Street',
  },

  // Buyer (optional for sale invoices)
  buyer: {
    name: 'Walk-in Customer', // Can be generic
  },

  // Invoice details
  invoiceDate: new Date(),
  currencyCode: 'VND',

  // Items
  items: [
    {
      itemName: 'Product',
      quantity: 1,
      unitPrice: 50000,
      amount: 50000,
    },
  ],

  // Totals
  totalAmount: 50000,
  totalPayment: 50000,
}

Create Sale Invoice

import { SaleInvoiceService } from '@nx-3rd/iiapi';

const invoice = await this.saleInvoiceService.create({
  seller: {
    taxCode: process.env.COMPANY_TAX_CODE,
    name: process.env.COMPANY_NAME,
    address: process.env.COMPANY_ADDRESS,
  },

  buyer: {
    name: customerName || 'Khách lẻ', // Walk-in customer
  },

  invoiceDate: new Date(),
  currencyCode: 'VND',

  items: cartItems.map(item => ({
    itemName: item.name,
    unitName: item.unit || 'Cái',
    quantity: item.quantity,
    unitPrice: item.price,
    amount: item.quantity * item.price,
  })),

  totalAmount: cartTotal,
  totalPayment: cartTotal,
  paymentMethod: 'CASH',
});

Difference from VAT Invoice

Aspect	VAT Invoice	Sale Invoice
Buyer tax code	Required	Not required
Tax deductible	Yes	No
VAT breakdown	Detailed	Simplified
Use case	B2B	B2C retail

Related

• Invoice Types Overview
• VAT Invoice
• POS Invoice