How to file a UK VAT return
The 9 boxes explained, what goes in each, common mistakes, and how MTD has changed the process. For UK VAT-registered businesses.
UK VAT returns are 9 numbered boxes filed quarterly via HMRC's Making Tax Digital (MTD) system. You report VAT collected on sales (output VAT), VAT paid on purchases (input VAT), and pay HMRC the difference. Due 1 month + 7 days after each quarter-end.
The 9 boxes, explained
Every UK VAT return uses the same 9 boxes whether you're a one-person consultancy or a £10m turnover business. Knowing what goes in each removes most of the confusion.
| Box | Label | What it is |
|---|---|---|
| 1 | Output VAT | VAT you collected from customers on your sales this quarter. |
| 2 | EU acquisitions VAT | VAT on EU-acquired goods. Usually £0 post-Brexit. |
| 3 | Total VAT due | Box 1 + Box 2. The total you owe before reclaim. |
| 4 | Input VAT reclaimed | VAT you paid suppliers and are reclaiming back. |
| 5 | Net VAT | Box 3 − Box 4. Positive = pay HMRC. Negative = HMRC refunds you. |
| 6 | Total sales (ex VAT) | All sales this quarter, excluding the VAT itself. |
| 7 | Total purchases (ex VAT) | All purchases this quarter, excluding VAT. |
| 8 | EU sales | Sales to EU customers. Usually £0 post-Brexit. |
| 9 | EU purchases | Purchases from EU suppliers. Usually £0 post-Brexit. |
When is it due?
Standard quarterly returns are due 1 month and 7 days after the quarter-end. If your quarter ended 31 March, your return is due by 7 May. Payment is due by the same date — late payment triggers interest plus a penalty under the new MTD penalty regime (a points-based system as of 2023).
Your VAT quarter pattern depends on what HMRC assigned at registration. Common patterns:
- Stagger 1: January, April, July, October quarter-ends
- Stagger 2: February, May, August, November
- Stagger 3: March, June, September, December
Making Tax Digital — what changed
Since April 2022, every VAT-registered UK business must use MTD-recognised software to submit returns. Manual entry via the old HMRC portal is no longer allowed for new returns. Your options:
- Bookkeeping software with MTD built in (Xero, QuickBooks, FreeAgent, Ledgers) — the books and the return live in the same place.
- Bridging software — keep your books in spreadsheets, use a bridging tool to file via the API. Not recommended for anyone serious about accuracy.
Cash basis vs accrual basis
Two ways to report VAT, and the difference matters for cashflow:
- Cash Accounting Scheme: You declare VAT when invoices are paid, not when issued. You only pay HMRC when the customer has paid you. Helpful if you have slow-paying customers. Limited to businesses with turnover ≤ £1.35m.
- Standard (accrual) scheme: You declare VAT when invoices areissued, regardless of payment. You may owe HMRC before the customer has paid.
Most early-stage UK businesses are better off on cash basis until they hit the threshold. See our guide on choosing.
Common mistakes
- Missing input VAT on purchases. If a supplier invoice doesn't have a VAT number, you can't reclaim. Get the number.
- Standard-rated sales filed as zero-rated. Massive Box 1 understatement. HMRC catches this with cross-checks.
- Reclaiming VAT on entertainment. Client entertainment is generally not VAT-reclaimable. Staff entertainment up to £150/head per year is.
- Filing late. The new points system means after 5 late filings you get a £200 penalty per return — and the points stay on your record for 24 months.
- Forgetting to file a nil return. Even if you owe £0, you still need to file the return.
The actual filing process
- Reconcile your books to your bank for the quarter — make sure every transaction is categorised correctly.
- Run your VAT report from your accounting software — it produces the 9 boxes.
- Review for anomalies (the same supplier appearing with different VAT treatments, big single transactions, etc.).
- Submit via MTD-recognised software — for most platforms this is one button after authorising HMRC access.
- Pay HMRC by the due date — Direct Debit is the most common method, set up via your HMRC Gateway.
- Keep the submission reference and a snapshot of the boxes — HMRC can audit up to 4 years back.
When something looks wrong
Before you submit, sanity-check: Box 1 should be approximately 20% of Box 6 if you're standard-rated. Box 4 should be roughly your VAT-bearing expenses × 20%. Box 5 (the net) should feel right given your turnover. If a number looks suspiciously round, suspiciously big, or suspiciously small — investigate before filing.
What if I made a mistake on a previous return?
Net errors under £10,000 (or 1% of Box 6, whichever is bigger) can be corrected on the next return — add to Box 1 or Box 4 as appropriate. Bigger errors need a VAT652 form submitted to HMRC. Don't hide the error: deliberate concealment is much worse than an honest correction.