Tax ID Field on the Payment Screen

What Is the Tax ID Field?

When subscribing to Clear Books Tax, the payment screen (powered by Stripe) shows an optional Tax ID field near the bottom.

This field is for a UK VAT number only. It is entirely optional.

What NOT to Enter

The following are not valid in this field:

What you might try	Why it does not work
UTR (Unique Taxpayer Reference)	Not a VAT number — used later when submitting to HMRC
Companies House number	Not a VAT number
Corporation Tax reference	Not a VAT number
Any other company reference	Only VAT numbers are accepted

Stripe validates the format of what you enter. If you type anything other than a valid VAT number, it will say "invalid".

What to Do

If your company is not VAT registered: Leave the field blank and click Continue. It is optional — you can complete your subscription without entering anything.

If your company is VAT registered: Enter your 9-digit VAT number (e.g. `123456789`). You do not need to include the `GB` prefix.

Where Do I Enter My UTR?

Your UTR (Unique Taxpayer Reference) is entered later, at the point of submitting your CT600 to HMRC — not during payment. Clear Books Tax will prompt you for it at the right time.