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VAT Checker Great Britain (GB)

Validate Great Britain VAT numbers (GB) by format and checksum (offline). Paste one or many VAT numbers and get a clear VALID/INVALID result with a normalized version you can copy.

This tool does not confirm live registration status (it performs local validation only). For UK variants including Northern Ireland (XI), use the dedicated UK tool below.

Category: Finance · URL: /tools/vat-checker-great-britain.html
Input (GB VAT numbers)
Offline validator: checks format + checksum for standard GB VAT numbers (9 digits; optional 3-digit branch suffix) and validates GD/HA patterns. It does not confirm live VAT registration status.
Output
Paste VAT numbers and click Validate.
Plain text (TSV)
Related tools
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use this GB VAT checker in seconds:

  1. Paste one VAT number per line (or comma-separated).
  2. Optionally enable Require GB prefix if you only want inputs starting with “GB”.
  3. Click Validate to see VALID/INVALID results and details.
  4. Use Copy results to paste into a spreadsheet.
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Secondary intents covered: Validate whether a GB VAT number is structurally valid (format + checksum), Normalize messy VAT input (spaces, hyphens, punctuation) into a standard GB form, Batch-check multiple GB VAT numbers at once, Detect special UK VAT types (GD government departments, HA health authorities), Identify why a VAT number fails (bad prefix, wrong length, checksum mismatch), Extract/recognize GB branch suffixes on 12-digit VAT numbers, Ensure a VAT number is GB (not XI/Northern Ireland) before using it in invoices, Copy results in a compact format for spreadsheets or audits

FAQ

Does this VAT checker confirm a business is VAT-registered?

No. This tool validates format and checksum locally; it can’t confirm live registration status.

What GB VAT number formats are supported?

Standard GB VAT numbers are 9 digits, optionally followed by a 3-digit branch suffix (12 digits total), plus special GD### and HA### patterns.

Can I enter VAT numbers with spaces or hyphens?

Yes. The tool removes common separators and normalizes the value (e.g., “GB 999 9999 73” → “GB999999973”).

What’s the difference between GB and XI?

GB is Great Britain. XI is used for Northern Ireland VAT in certain EU contexts; use the UK (GB/XI) tool for XI numbers.

What are GD and HA VAT numbers?

They are special UK VAT identifiers: GD000–GD499 for government departments and HA500–HA999 for health authorities.

Why does a 12-digit VAT number still use a 9-digit checksum?

The checksum applies to the first 9 digits; the last 3 digits are typically a branch identifier.

Why is my number marked invalid even though it looks correct?

Common reasons are a wrong prefix (e.g., XI/UK), wrong length, or checksum mismatch caused by a typo.