How to Complete a VAT Return
Learn how to fill in each box of a UK VAT return, reconcile your figures and submit accurately to HMRC under Making Tax Digital.
A VAT return is the periodic summary you send to HMRC showing how much VAT you charged on sales and how much you can reclaim on purchases. Getting it right matters: errors can trigger interest, penalties and the kind of correspondence no business owner enjoys. The good news is that the process is methodical, and once you understand what each box means and how to reconcile your records, completing a return becomes a routine part of your bookkeeping rather than a quarterly scramble.
This guide walks through who must file, what each box on the return means, how to check your figures, and how to submit accurately under Making Tax Digital.
Who must file VAT returns and how often
If your business is VAT-registered, you must submit returns even in periods where you have no sales or purchases (a “nil return”). Registration is compulsory once your taxable turnover exceeds the registration threshold, but many businesses register voluntarily to reclaim input VAT. If you are unsure whether you have crossed the line, read our guidance on when to register for VAT .
Most businesses file quarterly, on a cycle set by HMRC when you register. Some submit monthly (often those who regularly reclaim more than they owe) and a small number file annually under the Annual Accounting Scheme. Your filing frequency and the scheme you use both affect how you calculate the figures, so it is worth reviewing your options in our guide to choosing the right VAT scheme .
The nine boxes explained
Every UK VAT return is made up of nine boxes. Whether you trade as a sole trader or a limited company, the structure is identical.
| Box | What it shows |
|---|---|
| Box 1 | VAT due on sales and other outputs |
| Box 2 | VAT due on acquisitions of goods from EU member states (post-Brexit, usually relevant only to Northern Ireland) |
| Box 3 | Total VAT due (Box 1 plus Box 2) |
| Box 4 | VAT reclaimed on purchases and other inputs |
| Box 5 | Net VAT to pay to HMRC or reclaim (the difference between Box 3 and Box 4) |
| Box 6 | Total value of sales and outputs, excluding VAT |
| Box 7 | Total value of purchases and inputs, excluding VAT |
| Box 8 | Total value of goods supplied to the EU (Northern Ireland only) |
| Box 9 | Total value of goods acquired from the EU (Northern Ireland only) |
The figure in Box 5 is the one that determines whether you pay HMRC or receive a repayment. If Box 3 is larger, you pay; if Box 4 is larger, you reclaim. The amounts in Boxes 6 and 7 are net values, so they exclude the VAT itself, which trips up newcomers more often than any other part of the form.
Reconciling sales and purchase records before filing
Never submit a return straight from a raw transaction list. Reconciliation is the step that catches errors before HMRC does.
Before you file, work through the following:
- Confirm that every sales invoice in the period is recorded and that VAT has been applied at the correct rate.
- Check that purchase invoices you are reclaiming on are valid VAT invoices showing the supplier’s VAT number.
- Match your bank statements to your bookkeeping so no transactions are missing or duplicated.
- Separate out items where VAT cannot be reclaimed, such as most business entertainment and certain motor expenses.
- Verify the VAT control account balance agrees with the net figure you are about to declare in Box 5. For how this sits in your ledger, see VAT control accounts in the chart of accounts.
Tidy underlying records make this painless. If your bookkeeping is disorganised, the return becomes guesswork. For practical habits, see our advice on record keeping for expenses .
Submitting through MTD-compatible software
Under Making Tax Digital for VAT, you cannot type figures into HMRC’s website manually. You must keep digital records and submit your return using MTD-compatible software that connects to HMRC through an approved digital link.
In practice this means:
- Your bookkeeping data flows into the nine boxes without manual retyping.
- Any spreadsheets used in the calculation are joined by digital links, not copy-and-paste.
- The software authenticates with HMRC and files the return on your behalf.
If you have not yet moved across, work through our MTD for VAT checklist to make sure your setup meets the rules. The wider Making Tax Digital and software hub covers how MTD is expanding beyond VAT.
Paying VAT and deadlines
For standard quarterly filers, both the submission and the payment are usually due one calendar month and seven days after the end of the VAT period. So for a quarter ending 31 March, the deadline typically falls on 7 May. Always confirm the exact dates shown in your HMRC online account, as they are tailored to your registration.
Pay by Direct Debit, bank transfer or another HMRC-approved method, and allow time for the payment to clear before the deadline. Late submission and late payment can both lead to penalty points and interest at the applicable rate, so building a buffer into your routine is wise. Setting money aside as you go prevents nasty surprises; our guide to managing VAT cash flow explains how.
Common errors and how to avoid them
A handful of mistakes account for most VAT corrections:
- Reclaiming VAT without a valid invoice. No invoice, no reclaim. Keep the paperwork.
- Applying the wrong rate. Standard, reduced and zero-rated items are easy to confuse, especially in food, construction and printed goods.
- Including VAT in Boxes 6 and 7. These boxes are net of VAT.
- Double-counting transactions that appear in both the bank feed and a manual entry.
- Reclaiming on blocked items such as most entertainment.
If you spot a mistake after filing, do not ignore it. There is a structured process for putting things right, explained in our guide to correcting VAT return errors .
Keeping digital records and audit trail
MTD requires you to keep your VAT records in a digital format for the period HMRC specifies, typically several years. These records must show, for each transaction, the time of supply, the net value and the VAT charged, alongside your business details and the scheme you use.
A clean audit trail means an inspector can follow any figure on the return back to the original invoice without difficulty. Storing records digitally, with no broken links in the chain, protects you if HMRC ever queries a return. For more on retention and traceability, see our guidance on keeping a VAT audit trail .