How to do a VAT return: a step-by-step workflow for UK bookkeepers

Submitting a VAT return takes two minutes. Preparing one that is right takes the rest of the morning, and nearly all of that time is spent before the software shows you the nine boxes. This guide is a filing run for a bookkeeper with a client’s quarter to close: the checks that come first, what each box should contain, how to sense-check the totals, submitting and paying, and what to do when a past return turns out to be wrong. It assumes standard VAT accounting; the rules themselves, including registration and schemes, are in the UK VAT and Making Tax Digital guide. Every figure links to HMRC in the Sources section.

Step 1: finish the period

A VAT return is a report on the ledger. If the ledger is not finished, the return is wrong.

• Reconcile every bank and card account to the last day of the period.
• Post every sales invoice and credit note dated in the period.
• Post every purchase for which you hold a valid VAT invoice. A payment with no invoice goes in without reclaiming the VAT.
• Clear the suspense account. An uncoded item is an item with the wrong VAT code.
• Check the scheme. Standard accrual accounting, cash accounting, and the flat rate scheme produce different figures from the same transactions. Confirm the software is set to the scheme the client is registered for.

Step 2: review the VAT codes

Run the software’s VAT detail or audit report for the period: every transaction, with its net, VAT, and code. Read it for exceptions, not line by line.

• Sort by code. Scan each group for items that do not belong: a train ticket in standard-rated, an insurance premium with VAT on it.
• Sort by supplier. One supplier coded two ways in one quarter is usually one mistake.
• Look at the largest ten purchases. Each should have a VAT invoice you can open.
• Check the blocked and partial items: business entertainment, cars, and anything with private use.
• Check the reverse charge items: services bought from overseas suppliers, and construction services where the domestic reverse charge applies.
• Check zero against exempt against outside the scope. They all show no VAT but land in different places on the return.

The treatment of each category is covered in the UK VAT guide; definitions are in the glossary under VAT and input VAT.

Step 3: the nine boxes

HMRC’s VAT Notice 700/12 defines what goes in each box ^[1] .

Boxes 2, 8, and 9 now concern Northern Ireland’s trade in goods with the EU only ^[1] . For a business in England, Scotland, or Wales, a figure in any of them is a coding error to investigate.

Step 4: sense-check the totals

Before anyone approves the return, test it against things you already know.

• Box 1 against box 6. If every sale is standard-rated, box 1 should be 20% of box 6. A lower ratio needs explaining by zero-rated, reduced-rate, or exempt sales.
• Box 4 against box 7. Box 4 will be well under 20% of box 7, because wages are not in box 7 but rent, insurance, and other no-VAT costs are. Compare the ratio with the last four returns; a jump is a question.
• Box 6 against the profit and loss. Net sales for the period should agree to turnover, or you should be able to list the differences.
• Box 5 against the VAT control account. After the return is run, the control account balance should equal box 5 plus anything still unpaid from earlier periods.
• This quarter against last quarter and the same quarter last year.

Step 5: get approval, then submit

The return is the client’s. Send them the box totals and the amount due, and get a written yes before you file.

HMRC’s position is that virtually all VAT-registered businesses are required by law to submit their returns through functional compatible software and to pay electronically ^[1] . In practice that means filing from the accounting software, which sends the nine figures to HMRC, and keeping the submission confirmation.

The deadline for submitting online is usually one calendar month and 7 days after the end of the accounting period, and a return must be sent even if there is nothing to pay or reclaim ^[2] . Each return’s exact date is shown in the VAT online account. All dates are in UK tax deadlines.

Step 6: pay

The VAT must be paid by the deadline shown on the return ^[3] . A Direct Debit is the safest arrangement for a client who files on time, because the payment follows the return without anyone having to remember it. Whatever the method, tell the client the amount and the date in the same message as the return for approval, so the cash is in the account.

Step 7: close the period

• Lock the period in the ledger so nothing can be backdated into a filed quarter.
• Save the working papers: the return, the VAT detail report, the control account reconciliation, and the client’s approval. See workpapers and audit trail.
• Note anything for next quarter: invoices that arrived late, queries still open.

When a past return is wrong

Errors turn up. HMRC’s rules on correcting them ^[4] :

• You can correct errors in returns for the preceding 4 years.
• You can adjust on your next return if the net value of the errors is £10,000 or less, or between £10,000 and £50,000 but less than 1% of the total value of your sales.
• Errors above those limits must be reported to HMRC separately.
• Deliberate errors must always be reported separately and cannot be included in the calculation.
• Keep details of the error: the date it was discovered, how it happened, and the amount of VAT involved.

Work out the net value by adding up the VAT under-declared and setting it against the VAT over-declared across the errors you have found. If the client is anywhere near a threshold, or there is any question of the error being deliberate, bring in their accountant before the next return goes in.

Late returns and late payment

Late submission and late payment are penalised separately.

Late submission uses penalty points. Each late return earns one point until the threshold is reached, at which point HMRC charges £200, and another £200 for each further late return while at the threshold ^[5] .

The rules cover all returns, including nil and repayment returns ^[5] . A client who is owed a refund still collects a point for filing late.

Late payment carries a penalty that goes up after 16 days and again after 31 days, and late payment interest is charged from the first day the payment is overdue until it is paid in full ^[6] .

Mistakes that recur

• Reclaiming VAT from a card statement or a pro forma instead of a VAT invoice.
• Coding overseas software subscriptions as standard-rated purchases.
• Reclaiming VAT on business entertainment.
• Treating exempt and zero-rated as the same thing.
• Filing before the bank is reconciled, then amending.
• Submitting without the client’s approval.

Where ExpenseFlow fits

The codes reviewed in Step 2 are set long before the quarter ends. ExpenseFlow assigns a VAT treatment to each line of a bill or receipt at capture, using a UK rule set, and flags what a reviewer would want to see: a missing or invalid tax code, a cross-border purchase coded as domestic, a tax rate outside the expected range, a document where a valid VAT invoice is required, and construction services under the domestic reverse charge. It also extracts the supplier’s VAT registration number from the document and shows it; it does not validate the number against HMRC’s records. Every item waits in a review queue until a person approves it, then syncs to Xero or QuickBooks Online.

ExpenseFlow does not calculate the return, submit to HMRC, or make payments. Steps 3 to 7 happen in the accounting software.