Tax Invoice vs VAT Invoice: What It Is and What Makes It Valid

A tax invoice is an invoice issued by a VAT- or GST-registered business that contains the details tax law requires, so a registered buyer can reclaim the tax it paid. A VAT invoice is the same document under another name. An ordinary invoice also asks for payment, but without those details it won’t support a tax claim.

What is a tax invoice?

A tax invoice isn’t a special form. It’s a sales invoice that meets a VAT or GST system’s content rules, and in India it’s often called a GST bill. HMRC calls a VAT invoice “just the term for an invoice which contains some information required by the VAT rules”.

A registered buyer generally needs a valid tax invoice to deduct the tax you charged. In the UK, you can’t reclaim VAT with an invalid or pro-forma invoice, and India’s GST rules deny input tax credit without a tax invoice or debit note.

Tax invoice vs simplified tax invoice vs ordinary invoice

A proforma invoice isn’t a tax invoice either. To fix an issued tax invoice, use a credit note or a replacement invoice rather than editing it.

Tax invoice format: the fields most countries require

Whether you call it a tax invoice format or a VAT bill format, the core list is much the same. A full tax invoice usually shows:

1. The title “Tax Invoice”, required in the UAE and Saudi Arabia, and expected in Australia.
2. Your legal name, address and tax number: VAT number, ABN, TRN or GSTIN.
3. A unique, sequential invoice number. Here’s how to number invoices.
4. The issue date, and the date of supply if different.
5. The buyer’s name and address, plus their tax number for business sales in some countries.
6. Each item’s description, quantity and unit price.
7. The net amount, tax rate and tax amount, per line or per rate, with totals.
8. The tax in local currency, even if you bill in another currency.
9. Statements such as “Reverse charge” or an exemption reason, where they apply.

Payment terms and bank details aren’t tax requirements, but they’re among the essential elements of an invoice.

Valid VAT invoice rules by country (as of October 2026)

United Kingdom: full, modified and simplified VAT invoices

Only VAT-registered businesses can issue VAT invoices, and you must issue one to a VAT-registered customer for standard- or reduced-rated supplies, normally within 30 days. HMRC’s VAT Notice 700/21 describes three formats:

• Full: a sequential number, the time of supply, the issue date if different, your name, address and VAT number, the customer’s name and address, a description, and for each line the quantity, VAT rate and amount excluding VAT. Add the unit price, the rate of any cash discount and total VAT in sterling.
• Modified: a full invoice that shows VAT-inclusive values, an option for supplies over £250 when a customer asks for a VAT invoice.
• Simplified: for supplies of £250 or less, including VAT. It shows your name, address and VAT number, the time of supply, a description, and for each VAT rate the total including VAT and the rate. Exempt supplies can’t go on it.

The government plans to make e-invoicing mandatory for all VAT invoices from April 2029.

European Union: Article 226 mandatory details

Article 226 of the EU VAT Directive (2006/112/EC) lists what a full VAT invoice must contain, as applied in national law:

• the issue date and a sequential number
• your VAT number, plus the customer’s for reverse-charge and intra-EU supplies of goods
• both parties’ full names and addresses
• the quantity and nature of what you supplied, and the supply date if different
• the taxable amount per rate or exemption, the unit price excluding VAT, any discounts, the VAT rate and the VAT amount
• notes such as “Reverse charge” or “Self-billing”, or an exemption reference, where they apply

Amounts can be in any currency, but VAT must also appear in national currency (Art. 230). Member states must allow simplified invoices up to €100 and may raise the limit to €400 (Art. 220a and 238), except in some cross-border cases. These need at least the issue date, your identity, the type of goods or services, and the VAT or the figures to work it out (Art. 226b).

Under the VAT in the Digital Age package, member states may now require e-invoicing under certain conditions, and e-invoice-based reporting for cross-border B2B sales starts on July 1, 2030.

Australia: the A$82.50 and A$1,000 thresholds

Your buyer needs a tax invoice to claim GST credits on purchases over A$82.50 including GST, and you must provide one within 28 days if asked. The ATO requires:

• wording that shows it’s intended to be a tax invoice
• your identity and ABN, and the issue date
• a brief description, with quantity (if applicable) and price
• the GST amount, or “Total price includes GST” where GST is exactly one-eleventh of the total
• the extent to which each sale is taxable

For sales of A$1,000 or more, add the buyer’s identity or ABN. Unregistered businesses must not call their invoices tax invoices.

Saudi Arabia: tax invoice, simplified tax invoice and Fatoora

ZATCA’s invoicing guideline (May 2026) has two main types. A standard tax invoice usually goes to businesses and government bodies, and is generally required for supplies over SAR 1,000. A simplified tax invoice covers supplies under SAR 1,000 and, whatever the value, sales to individuals who aren’t subject to VAT.

A tax invoice shows its title, the issue date and time, a sequential number, both parties’ names and addresses, your VAT number, the buyer’s VAT number or other ID, and for each line the description, quantity, unit price, discount, VAT rate and VAT in riyals, plus ZATCA’s QR code. It must be in Arabic, and other languages can be added. A simplified invoice may instead state that the total includes VAT at 15%.

A tax invoice is due within 15 days after the end of the month of supply, and a simplified one on the date of supply or payment, if earlier.

Under mandatory e-invoicing (Fatoora), resident taxpayers have issued invoices through compliant electronic solutions since December 4, 2021, not by hand or with text editors or spreadsheets. Phase 2, rolled out in waves since January 2023, connects those systems to ZATCA’s platform. Wave 25 covers taxpayers whose VAT-able revenue exceeded SAR 187,500 in any year from 2022 to 2025. Once notified, they must integrate by February 1, 2027.

United Arab Emirates: tax invoice, simplified tax invoice and e-invoicing

Under Article 59 of the VAT Executive Regulation, a full tax invoice shows “Tax Invoice”, both parties’ names and addresses, your TRN and the buyer’s if registered, a sequential number, the issue date, the supply date if different, and a description. Each item needs its unit price, quantity, tax rate and amount in dirhams (AED). Add any discount, the gross amount, the tax in AED with any exchange rate used, and a reverse charge statement where needed.

A simplified tax invoice is allowed when the buyer isn’t registered, or is registered and the consideration is AED 10,000 or less, except for reverse-charge supplies. It needs only the title, your details and TRN, the date, a description, and the total and tax in AED. The FTA’s guide says to issue tax invoices within 14 days of the supply.

According to the Ministry of Finance, businesses with revenue of AED 50 million or more had to appoint an accredited service provider by October 30, 2026 and must go live by January 1, 2027. Smaller businesses must appoint one by March 31, 2027 and go live by July 1, 2027. Consumer sales are excluded for now, and PDFs and scans aren’t e-invoices.

India: GST tax invoice (CGST Rule 46) and e-invoicing

Registered suppliers issue a tax invoice under section 31 of the CGST Act. Suppliers of only exempt goods or services, and composition taxpayers, issue a bill of supply instead. Rule 46 of the CGST Rules lists the contents, including:

• your name, address and GSTIN, the date, and a serial number of up to 16 characters, unique for the financial year
• the buyer’s name, address and GSTIN if registered, or for an unregistered buyer, their name and address plus the delivery address and state when the taxable value is ₹50,000 or more
• the HSN code, description, quantity, taxable value, and the rate and amount of each GST component and any cess
• the place of supply for inter-state sales, whether reverse charge applies, and a signature, which electronic invoices don’t need

Once your aggregate turnover has exceeded ₹5 crore in any year since 2017-18, B2B invoices must be e-invoices (Notification 10/2023-Central Tax, from August 1, 2023), though some sectors, such as banking and insurance, are exempt. Each is registered on a government portal that returns an Invoice Reference Number and QR code. Under Rule 48(5), an invoice such a business issues any other way isn’t treated as an invoice.

United States: no VAT

The US has no national VAT or GST. As a Congressional Research Service brief notes, states generally impose retail sales taxes instead. Their invoicing rules vary, so check with your state’s revenue department.

Note: This is general information as of October 2026, not tax advice. Rules and thresholds change, so check with your tax authority or an accountant. For how e-invoices differ from PDFs, see digital invoices and e-invoicing.

Tax invoice sample

Here’s a full UK VAT invoice from a fictional studio. The work finished on September 30 and the invoice went out two days later, so under HMRC’s 14-day rule the invoice date is the tax point:

To skip the layout work, start from our invoice templates or an invoice generator app, then check every required field is there.

Checklist before you send a tax invoice

• You’re registered, and your VAT or GST number is on the invoice.
• The title says “Tax Invoice” where required.
• The number is next in your sequence, and the issue and supply dates are right.
• The buyer’s name, address and, where required, tax number are there.
• Every line shows a description, quantity, unit price, net amount, tax rate and tax.
• The totals show net, tax and gross amounts, with tax in local currency.
• If e-invoicing applies, the invoice went through your e-invoicing system.
• You’ve kept a copy. In the UK, keep VAT records for at least 6 years.

Frequently asked questions