What to Include on an Invoice: Checklist and Rules by Country

A good invoice answers every question your client could have before they pay: who it is from, what it is for, how much, by when and how. That is why the same core details appear on invoices in almost every country. On top of those, tax-registered businesses have to include extra information set by their tax authority, and an invoice without it may not be valid for the client to reclaim tax.

This checklist covers the universal essentials first, then the extra requirements in the UK, the EU, the United States, India, Australia and Pakistan. It is a practical summary, not legal advice - if you are registered for tax, check the current rules with your tax authority or accountant.

The essential invoice checklist

Every invoice should include:

Item	Why it matters
The word "Invoice"	Distinguishes it from a quote, estimate, statement or receipt.
Unique invoice number	Lets both sides refer to it and keeps your records in order. Usually required by law.
Invoice date	Starts the payment clock and fixes the tax period it belongs to.
Supply date	The date the goods were delivered or the service performed, if different from the invoice date.
Your name, address and contact details	Identifies who is owed the money and who to contact with questions.
Client's name and billing address	Identifies who owes it. For businesses, use the legal entity name.
Description of goods or services	Specific enough that the client can check it against what they ordered.
Quantity, rate and line total	Shows how each amount was calculated.
Subtotal, discounts, tax and total due	The total should be unmissable.
Due date or payment terms	Tells the client exactly when to pay.
Payment details	Bank details, payment link or QR code - how to pay you.

Useful extras

• Purchase order (PO) number - many companies cannot pay an invoice without one.
• Your logo - makes the invoice easy to recognise in a pile.
• Payment reference instruction - "Please quote invoice 2026-014" makes payments easy to match.
• Late payment terms - if you charge interest or a fee, state it (and make sure it was agreed in your contract).
• A short thank-you note.

United Kingdom

For a business that is not VAT registered, GOV.UK says an invoice must include a unique identification number; your company name, address and contact information; the company name and address of the customer; a clear description of what you are charging for; the date the goods or service were provided; the date of the invoice; the amount being charged; VAT if applicable; and the total amount owed.

• Sole traders must include their own name and any business name they use, plus an address where legal documents can be delivered if they use a business name.
• Limited companies must use the full company name as it appears on the certificate of incorporation. If you list directors' names, you must list all of them.

If you and your customer are both VAT registered, you must issue a VAT invoice. On top of the above it must show your VAT registration number, the time of supply (tax point) if different from the invoice date, the unit price, quantity and VAT rate for each item, the total excluding VAT, any discount, and the total VAT charged. Retailers can issue a simplified VAT invoice for supplies of £250 or less including VAT.

European Union

EU VAT invoices follow the EU VAT Directive, applied through each country's own law. A full VAT invoice generally needs: date of issue; a sequential number that uniquely identifies it; the supplier's VAT number; the customer's VAT number where the customer is liable for the tax (for example under reverse charge); both parties' full names and addresses; the quantity and nature of goods or extent of services; the date of supply if different; the taxable amount per rate, unit price excluding tax and any discounts; the VAT rate; and the VAT amount payable. For reverse-charge supplies the invoice must say "Reverse charge". Several EU countries now require structured e-invoices for some or all business-to-business sales, so check your own country's timetable.

United States

There is no federal law that sets out what an invoice must contain. The essential checklist above is the practical standard. Sales tax is set by each state (and sometimes city or county), so if you collect it, show the taxable amount, the rate and the tax as separate lines. If you pay contractors, note that the IRS reporting threshold for Forms 1099-NEC and 1099-MISC rose from $600 to $2,000 for payments made from 1 January 2026 - invoices from contractors are the record behind those forms, so keep them.

India (GST)

Under Rule 46 of the CGST Rules, a GST tax invoice must include, among other things: the supplier's name, address and GSTIN; a consecutive serial number of up to 16 characters, unique for the financial year; the date of issue; the recipient's name, address and GSTIN if registered; the HSN code for goods or SAC for services; a description; quantity and unit; total value and taxable value after discounts; the tax rate and amount split into CGST and SGST, or IGST; the place of supply for inter-state supplies; whether tax is payable on reverse charge; and a signature or digital signature. Businesses whose aggregate turnover has exceeded ₹5 crore in any financial year since 2017-18 must also generate e-invoices through the Invoice Registration Portal (IRP).

Australia (GST)

A GST-registered business must provide a tax invoice when a customer asks for one on a taxable sale over $82.50 including GST. For sales under $1,000, the tax invoice needs: a statement that it is intended to be a tax invoice; the seller's identity and ABN; the date; a brief description of what was sold; and the GST amount (or a statement that the total price includes GST). For sales of $1,000 or more, it must also show the buyer's identity or ABN.

Pakistan (sales tax)

A registered person making a taxable supply must issue a serially numbered sales tax invoice showing: the name, address and registration number (STRN/NTN) of the supplier and of the recipient; the date of issue; a description and quantity of the goods; the value excluding sales tax; the sales tax amount; and the value including tax. FBR has extended electronic invoicing (integration with its system) to more categories of taxpayers over time, so check whether it applies to you.

Common gaps that delay payment

• The client's legal company name or PO number is missing, so their accounts team cannot match it.
• The due date is missing, so it waits for the client's next payment run.
• Bank details are missing or incomplete (no sort code, routing number or IBAN).
• Tax is charged without a registration number, or the tax amount is not shown separately.
• Descriptions are too vague for the client to approve without asking.

Create an invoice with every field in place

The free invoice generator has a field for each item on this checklist: tax registration numbers, PO references, due dates with Net 7, 14, 30 or 60 shortcuts, VAT, GST or sales tax lines, bank details and payment QR codes. Fill it in, download the PDF and send it. For step-by-step guidance, see how to write an invoice.

Frequently asked questions

Is an invoice legally required?

For tax-registered businesses selling to other businesses, usually yes - VAT and GST systems require invoices so the buyer can reclaim tax. For other sales it depends on the country, but an invoice is always the clearest record of what was agreed and owed.

Does an invoice need a signature?

In most countries, no. India's GST rules are an exception: tax invoices must be signed or digitally signed by the supplier or an authorised representative.

Can I leave out my address?

Not on a formal invoice in most countries - the seller's address is one of the standard required fields. Freelancers who work from home often use a business address or registered office service for this reason.