The short answer
No. There's no legal requirement in the UK for an invoice to be signed, by you or by your client, and that includes VAT invoices. What matters is that it contains the right information (gov.uk).
What an invoice must include
- A unique invoice number.
- Your name or business name, address and contact details. Sole traders trading under a business name also need an address where legal documents can be delivered. Limited companies use the full registered name.
- Your client's name and address.
- A clear description of what you're charging for, the date you supplied it and the invoice date.
- The amount, any VAT, and the total owed.
- If you and your client are both VAT registered, a VAT invoice with the extra details HMRC requires.
Why ask a client to sign anyway
A signature turns "I never agreed to that amount" into a much harder argument. It's evidence your client received the invoice and accepted the work and the figure, which helps if you later have to chase it. See what counts as proof.
It matters even more at the start: a client who signs a quote has accepted your price and terms before you begin. In AgreeVia, clients sign to accept a quote and to confirm an invoice. It's proof, never a condition of payment.
Electronic or paper?
Either. Since there's no signature requirement, an e-signed invoice is as good as any other, and an electronic signature on a quote or contract is valid for most business documents in the UK.
Questions people ask
Does a VAT invoice need a signature?
No. VAT invoices need specific information, such as your VAT number and the VAT rate for each item, but not a signature.
Will a signed invoice get me paid faster?
Not by itself, but it removes the most common excuse for not paying, and gives you a clear record if you have to chase.
Should I sign my own invoices?
There's no need. Make sure your details, the invoice number and the payment terms are on it.
This guide explains the general position in the UK as we understand it on 22 October 2026. The law differs between England and Wales, Scotland and Northern Ireland, and it changes. If something important turns on it, talk to a solicitor or an accountant.
Templates and tools for this
Send your first agreement free
Make an invoice with the VAT worked out and your bank details on it, and have your client sign to confirm it.
Free for 3 documents a month, no card needed. AgreeVia works in your browser and is live on Google Play. Coming soon to the App Store.