VAT Invoice

VAT Invoices are full tax invoices used for B2B transactions where the buyer needs tax deduction.

Overview

Attribute	Value
Service	VATInvoiceService
Tax Deductible	Yes
Buyer Info	Required
CQT Submission	Required

Required Fields

Seller Information

seller: {
  taxCode: '0123456789',      // Company tax code
  name: 'Your Company Name',   // Legal company name
  address: '123 Street',       // Registered address
  bankAccount: '1234567890',   // Bank account (optional)
  bankName: 'Vietcombank',     // Bank name (optional)
}

Buyer Information

buyer: {
  taxCode: '9876543210',       // Required for VAT invoices
  name: 'Customer Company',
  address: '456 Avenue',
  email: 'buyer@company.com',  // Optional
}

Invoice Items

items: [
  {
    itemName: 'Product A',
    unitName: 'Piece',
    quantity: 10,
    unitPrice: 100000,
    amount: 1000000,           // quantity * unitPrice
    vatRate: 10,               // 0, 5, 8, or 10
    vatAmount: 100000,         // amount * vatRate / 100
  },
]

Create VAT Invoice

import { inject } from '@venizia/ignis';
import { VATInvoiceService } from '@nx-3rd/iiapi';

class InvoiceController {
  constructor(
    @inject({ key: 'services.VATInvoiceService' })
    private vatService: VATInvoiceService,
  ) {}

  async createInvoice(orderData: OrderData) {
    const invoice = await this.vatService.create({
      // Seller (your company)
      seller: {
        taxCode: process.env.COMPANY_TAX_CODE,
        name: process.env.COMPANY_NAME,
        address: process.env.COMPANY_ADDRESS,
      },

      // Buyer (customer)
      buyer: {
        taxCode: orderData.customerTaxCode,
        name: orderData.customerName,
        address: orderData.customerAddress,
      },

      // Invoice details
      invoiceDate: new Date(),
      currencyCode: 'VND',
      exchangeRate: 1,

      // Items
      items: orderData.items.map(item => ({
        itemName: item.name,
        unitName: item.unit,
        quantity: item.quantity,
        unitPrice: item.price,
        amount: item.quantity * item.price,
        vatRate: 10,
        vatAmount: item.quantity * item.price * 0.1,
      })),

      // Totals
      totalAmount: orderData.subtotal,
      totalVatAmount: orderData.tax,
      totalPayment: orderData.total,
    });

    return invoice;
  }
}

VAT Rates

Rate	Description	Examples
0%	Export, international	Export goods
5%	Essential goods	Healthcare, education
8%	Reduced rate	Certain services
10%	Standard rate	Most goods/services

Invoice Lifecycle

Submit to T-VAN

const result = await this.invoiceManagementService.submit({
  invoiceId: invoice.id,
  clientName: 'default',
});

// Result contains:
// - Invoice number (auto-assigned)
// - Digital signature
// - T-VAN reference ID

Related

• Invoice Types Overview
• Sale Invoice
• API Reference
• Compliance