Filing a VAT return is one of those quarterly chores that looks harder than it is. The form has nine boxes, the maths is straightforward, and HMRC's MTD-compatible software handles most of the submission. This guide walks through what each box means, where the figures come from, the deadlines you cannot miss, and how to fix a mistake without penalty if you spot it after submission.
When is your VAT return due?
Most businesses file quarterly. Your VAT return and payment are both due one calendar month and seven days after the end of your VAT period. So a quarter ending 31 March 2026 has a return and payment deadline of 7 May 2026.
Two scheme variants change this:
- Annual Accounting Scheme: one return per year, payment deadline two months after year end. You make interim payments through the year.
- Monthly returns: usually for repayment traders (regular refunds), same one-month-and-seven-days deadline.
You can find your specific deadlines in your HMRC online account. Set a calendar reminder; the late submission penalty system has no grace for "I forgot."
The nine boxes explained
Every VAT return has the same nine boxes. Your accounting software fills most of them automatically from your transaction records, but you should understand what each one is supposed to contain so you can spot when something is wrong.
| Box | What it contains |
|---|---|
| Box 1 | VAT due on sales and other outputs (the VAT you charged customers) |
| Box 2 | VAT due on acquisitions from EU member states (Northern Ireland only since Brexit) |
| Box 3 | Total VAT due (Box 1 + Box 2, calculated automatically) |
| Box 4 | VAT reclaimed on purchases and other inputs (input VAT you can reclaim) |
| Box 5 | Net VAT to pay or reclaim (Box 3 minus Box 4) |
| Box 6 | Total value of sales and outputs (excluding VAT) for the period |
| Box 7 | Total value of purchases and inputs (excluding VAT) for the period |
| Box 8 | Total value of supplies of goods to EU member states (Northern Ireland only) |
| Box 9 | Total value of acquisitions from EU member states (Northern Ireland only) |
For a typical Great Britain business doing standard 20% VAT work with no EU acquisitions, Boxes 2, 8 and 9 are zero. Your real numbers are Boxes 1, 4, 6 and 7.
Where the numbers come from
Box 1, output VAT
The total VAT you charged on sales in the period. If you raised an invoice for £1,000 plus VAT (£200 VAT), the £200 contributes to Box 1. Standard VAT accounting uses invoice date; cash accounting uses payment received date.
Box 4, input VAT
The total VAT you paid on business purchases that you can reclaim. A few key restrictions:
- Must be a genuine business purchase
- You must hold a valid VAT invoice
- Cannot reclaim VAT on entertaining UK customers. VAT on staff entertainment, such as a staff party, is reclaimable to the extent it is for business purposes; the share spent on guests who are not employees counts as business entertainment. The £150 a head limit you may have heard of is a separate income tax and National Insurance exemption for an annual staff function, not a VAT limit.
- Cannot reclaim 50% of VAT on car purchases unless used 100% for business
- Cannot reclaim VAT on most personal use proportions
Boxes 6 and 7, the net figures
Box 6 is total sales excluding VAT, including zero-rated and exempt sales. Box 7 is total purchases excluding VAT. These are HMRC's headline turnover and expense figures for your business, not just the VAT-bearing items.
Submitting the return
Since April 2022, you must submit via HMRC-approved MTD-compatible software. The HMRC online VAT portal is closed for new submissions. Most cloud accounting packages (Xero, QuickBooks, FreeAgent, Sage) handle the submission inside the software once you connect them to HMRC. If you use a spreadsheet, you submit via bridging software like VitalTax or 123 Sheets.
Paying the VAT
Payment options, in order of preference:
- Direct debit: collected automatically three working days after the deadline. Set this up once and forget it.
- Faster payments: bank transfer using HMRC's account details and your VAT reference. Same-day clearance.
- BACS: 3 working days to clear, factor that in.
- Card via GOV.UK: no fee with a personal debit card. Corporate debit and credit cards carry a non-refundable fee, and personal credit cards are not accepted.
- Cheque: still accepted but slow and risky.
If you are due a refund, HMRC normally pays within 30 days, often within 10. Make sure your bank details are correct in your HMRC online account.
Common mistakes
Reclaiming VAT you cannot reclaim
Customer entertaining, personal use, certain motoring expenses. HMRC's compliance system flags unusual ratios, so reclaiming VAT on a steady stream of restaurant bills will eventually trigger a check.
Wrong tax point
Standard accounting uses invoice date; cash accounting uses payment date. Mixing the two within a return is the most common reconciliation error and almost always results in a small over- or under-payment.
Missing reverse charge entries
If you buy services from overseas suppliers (Microsoft, Google Cloud, AWS, an overseas freelancer), you usually account for the VAT yourself under the reverse charge mechanism. The same VAT amount goes into both Box 1 (output) and Box 4 (input), netting to zero, but the gross values must appear in Boxes 6 and 7. A lot of small businesses miss this entirely.
Forgetting to include all sales
Zero-rated sales (most food retail, books) and exempt sales (insurance, training) still go into Box 6, just not Box 1. Easy to miss if you only count VAT-charged invoices.
Correcting an error
If you spot a mistake after submission, the rules depend on the size:
- Net error of £10,000 or less: you can adjust your next VAT return, adding it to Box 1 if you underpaid or Box 4 if you overpaid.
- Net error between £10,000 and £50,000 that is no more than 1% of the Box 6 figure on the return where you find it: you can still adjust the next return.
- Anything larger, or any deliberate error: report it to HMRC separately, either with HMRC's online form for VAT return errors or in writing to the VAT Error Correction Team, BT VAT, HMRC, BX9 1WR, quoting your VAT registration number. You can also report a smaller error this way if you prefer.
HMRC withdrew form VAT652 in September 2025. You can correct errors going back four years.
An error made despite taking reasonable care carries no penalty, though interest is due on any VAT paid late. For a careless error, telling HMRC before it finds the problem earns a bigger reduction in the penalty. Penalties are higher for deliberate errors, and higher again where the error was concealed.
Need to add up the VAT before it goes into Box 1 or Box 4? Use the calculator.
Open the VAT Calculator