---
title: "Tax invoice"
description: "What is a tax invoice? The invoice a VAT- or GST-registered supplier issues so the buyer can reclaim the tax. See what it must show, with a worked example."
url: https://1flux.ai/glossary/tax-invoice
last_updated: 2026-10-11
---

[Sales and CRM](https://1flux.ai/glossary#sales-and-crm)

# Tax invoice

What is a tax invoice, and what does it need to show so your customer can reclaim the tax?

Glossary Updated 11 October 2026

Definition

A tax invoice is the invoice a VAT- or GST-registered supplier issues for a taxable supply, showing the tax charged so the buyer can reclaim it as input tax.

## What is a tax invoice used for?

Tax authorities set what a tax invoice must show. Typical requirements include the words “Tax invoice”, the supplier’s [tax registration number](https://1flux.ai/glossary/tax-registration-number), the date, a description of the supply, the taxable amount, the tax rate and the tax due, and for many business sales the buyer’s details too. Buyers need a valid tax invoice to reclaim [input VAT](https://1flux.ai/glossary/input-and-output-vat), so missing details can block their claim.

Some countries also require tax invoices to be issued as [e-invoices](https://1flux.ai/glossary/e-invoicing). In Saudi Arabia that has applied since 4 December 2021 under ZATCA rules, and the UAE’s mandatory e-invoicing starts in 2027.

Example: a trader bills SAR 10,000 plus 15% VAT of SAR 1,500, a total of SAR 11,500, showing its 15-digit VAT registration number. A [proforma invoice](https://1flux.ai/glossary/proforma-invoice) is not a tax invoice.

In 1flux

1flux issues ZATCA-compliant e-invoices for Saudi Arabia, covering Phase 1 (generation) and Phase 2 (integration with ZATCA’s Fatoora platform), and supports UAE e-invoicing under the Federal Tax Authority’s programme, ready for the 2027 go-live dates. Each sales invoice posts output VAT at the rate in force on the invoice date and shows the selling entity’s VAT number. [See e-invoicing in 1flux](https://1flux.ai/products/e-invoicing)

Related

## Keep exploring

### [VAT](https://1flux.ai/glossary/vat)

A tax charged on sales and reclaimed on purchases.

### [E-invoicing](https://1flux.ai/glossary/e-invoicing)

Issuing invoices in a structured format that tax systems can read and validate.

### [Tax registration number](https://1flux.ai/glossary/tax-registration-number)

The number a tax authority gives a VAT-registered business.

### [Sales orders](https://1flux.ai/products/sales-orders)

Customer POs to orders, deliveries, invoices and payments, on one board.

Last updated 11 October 2026