What to include on an invoice: a checklist for freelancers and small businesses

A clear invoice gets paid faster and keeps your records clean. Tax rules vary by country, but these fields belong on almost every invoice.

The checklist

• The word “Invoice” and a unique invoice number in sequence, so no two invoices share a number.
• Invoice date and, if different, the date the work was done or goods were delivered.
• Your details: business name, address and contact, plus your tax or VAT/GST number if registered.
• Client details: their name and address.
• Line items: a description, quantity, unit price and line total for each.
• Tax: the rate and amount for each rate used, and the grand total.
• Payment terms: due date, accepted methods and bank details.

VAT invoices in the UK

For VAT-registered businesses, HMRC lists the details a VAT invoice must show, including a unique number, your VAT number, the VAT rate and the amount payable. Other countries have similar rules, so check your own tax authority.

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Habits that get you paid faster

• Send the invoice as soon as the work is done.
• Use clear terms such as “Due within 14 days”.
• Say what happens if payment is late, for example a stated late fee, if your contract allows it.
• Keep a copy of every invoice for your records.

The generator below builds an invoice with line items and tax, then lets you print it or save it as a PDF. Nothing is uploaded or stored.

Invoice, quote, receipt, credit note: what is the difference?

• Quote or estimate: a price offer before work starts.
• Invoice: a request for payment for work done or goods supplied.
• Receipt: proof that payment was received.
• Credit note: a document that reduces or cancels an invoice, for example after a return or error.

Invoice numbering that works

Use a simple, unique, sequential system, such as INV-2026-001, INV-2026-002. Do not reuse or skip numbers without a reason, since gaps can trigger questions in an audit. If you correct a mistake, issue a credit note and a new invoice rather than editing the old one.

Payment terms: choose and state them clearly

For new clients, shorter terms or a deposit reduce risk. Include bank details, accepted payment methods and a payment reference.

Late payment: what to write and what the law may allow

State your late payment policy on the invoice and in your contract. In the UK, the Late Payment of Commercial Debts (Interest) Act lets businesses charge statutory interest on late commercial debts, plus fixed compensation, unless the contract sets a reasonable alternative. Other countries have their own rules, so check locally.

Tax invoice requirements by country

• UK: VAT invoices need a unique number, your VAT number, the tax point or date, a description, the VAT rate and the amount payable.
• India (GST): GSTIN of supplier and, where required, recipient, HSN or SAC code, place of supply, tax rate and amount, and the invoice is generally issued within the time the GST rules allow, such as 30 days for services.
• Australia: a tax invoice must show the ABN and that it is a tax invoice, with GST shown for sales over A$82.50 including GST.
• US: there is no national format. Include a clear description, amounts and your details, and check state sales tax rules.

How to add tax correctly

Add line items, calculate tax per line or on the subtotal as your rules require, and show the total clearly. If your prices are tax-inclusive, state it. Use the same rounding method on every invoice.

Freelancer and small-business tips

• Invoice promptly, ideally the day you finish.
• Put the due date in a prominent place.
• Use a clear subject line and send the PDF to the person who pays, not only the person who hired you.
• Send a polite reminder a few days before the due date and again after.

Record keeping

Keep copies of invoices and related records for the period your tax authority requires. This is often several years, and the exact length depends on your country, so confirm locally.

Create an invoice with the generator

Add your details, client details, line items and tax rate. Print it or save it as a PDF. Nothing is uploaded or stored.

Troubleshooting: common problems and fixes

• A client says the invoice is invalid. Check that it shows your details, a unique number, a date, the tax details and a clear description.
• The client has not paid. Send a polite reminder, restate the due date and attach the invoice again. Follow your contract for late fees.
• I made a mistake. Issue a credit note and a new invoice rather than editing the original.
• The currency is different. State the currency clearly and the exchange rate used if relevant.
• My tax authority wants a specific format. Check their rules, because some countries require e-invoicing or specific fields.

Is the invoice generator private?

The generator runs entirely in your browser. Client names, amounts and bank details are not uploaded or stored. Download or print the invoice and keep your own copy. The checklist here is general guidance, so confirm the legal requirements in your country.

More free Zyphub tools you may need

• Invoice Generator: Professional invoice, print or save as PDF.
• GST / VAT / Sales Tax Calculator: Add or remove tax from any price.
• E-commerce Net Profit Calculator: Real profit per order after all costs.

General information only, not tax, legal or financial advice. Rates change, so check the official source.