Is a signature required on a UK invoice?

Are signatures mandatory on UK invoices?

No.
HMRC doesn’t require invoices to be signed. You can read the UK government’s guidance on invoices¹, which applies to limited companies and sole traders. An unsigned invoice is still fully valid for VAT and bookkeeping. A contract or a client’s internal policy might ask for a signature as an authorization step, but that’s a commercial choice, not a tax rule.

Why add a signature anyway?

• Credibility and trust
  A signed invoice can feel more official to some customers, reducing friction and back‑and‑forth.
• Professional impression
  The small touch of a signature can elevate how your brand is perceived. Polished, careful, and reliable.
• Simple to implement
  You don’t need to handwrite anything. Most invoicing tools let you add a digital signature in a few clicks.
• Extra assurance
  It acts as a visible confirmation of accuracy, which can help if questions or disputes arise later.

Who should sign?

Anyone authorized to represent your business can sign. Could be the owner, finance lead, account manager, or another delegated team member. It doesn’t have to be a specific individual.

How to add a digital signature to a PDF invoice

With createinvoice.uk, you can draw a digital signature using your mouse (or your finger on a phone or tablet) and embed it directly into the generated PDF. It’s fast, clean, and keeps your workflow paper-free. Let's create a invoice now.