How to Do a VAT Return: A Step-by-Step Guide

Filing a VAT return step by step doesn't have to be complicated. If your bookkeeping is up to date, the return itself is largely a matter of checking figures and clicking submit. This guide walks you through the entire VAT return process—from preparation to submission—so you know exactly what to do each quarter.

Most VAT-registered businesses must file via Making Tax Digital for VAT, which sounds more intimidating than it is. MTD is simply "you use software to tell HMRC about VAT" rather than "you mail a form." Much more survivable.

Before you start: get your records in order

Before you can file an accurate VAT return, you need to ensure that all transactions for the VAT period are recorded in your accounting system:

All sales invoices have been raised
All purchase invoices have been entered
All bank transactions have been reconciled
Any adjustments (bad debt relief, reverse charges, etc.) have been recorded

The VAT return is only as accurate as the data behind it. Rushing to file without completing your bookkeeping guarantees errors. Conversely, spend an hour tidying your records now and you'll sail through the return.

Bank reconciliation for the VAT period is essential. It confirms that every transaction has been captured and that nothing has been missed or double-counted. If you've not been reconciling monthly, do it now before filing the return.

Know exactly which period you are filing for. VAT periods are typically quarterly, but you may be on monthly or annual accounting. The dates are set by HMRC and shown on your online VAT account.

The nine boxes: what each one means

Your VAT return consists of nine boxes. Here's what each one means and where the figure comes from.

Box 1: VAT due on sales and other outputs

This is the total VAT you have charged on your sales during the period. If you sell a product for £100 plus 20% VAT, the £20 goes in Box 1.

Source: The sum of all output VAT on your sales invoices and any other outputs (e.g., self-supplies, reverse charges you need to account for).

Box 2: VAT due on acquisitions from EU member states

For most businesses, this is zero post-Brexit. It's mainly relevant for Northern Ireland businesses acquiring goods from EU countries under the Northern Ireland Protocol.

Box 3: Total VAT due

Simply Box 1 plus Box 2. This is calculated automatically by your software.

Box 4: VAT reclaimed on purchases and other inputs

This is the total VAT you have paid on your business purchases that you're entitled to reclaim. If you bought supplies for £500 plus £100 VAT, the £100 goes in Box 4.

Source: The sum of all input VAT on your purchase invoices and expenses. Important: only business-related VAT is reclaimable. VAT on entertainment, non-business purchases, or blocked items cannot be reclaimed. Yes, this feels obvious. No, you'd be surprised how often people try anyway.

Box 5: Net VAT to pay or reclaim

Box 3 minus Box 4. If this is positive, you owe HMRC. If negative, HMRC owes you a refund.

Box 6: Total value of sales excluding VAT

The net value of all your sales for the period (excluding VAT). This includes standard-rated, reduced-rated, zero-rated, and exempt sales.

Box 7: Total value of purchases excluding VAT

The net value of all your purchases for the period (excluding VAT). This includes all business purchases, whether the VAT is reclaimable or not.

Box 8 & 9: EU-related acquisitions and supplies

These are mainly relevant for Northern Ireland. Unless you're trading with EU member states under the Protocol, both are zero.

Filing your VAT return: the process

Step 1: Run your VAT report

In your accounting software, generate the VAT return report for the period. This pulls all nine boxes directly from your transaction data and presents them in the standard format ready for review.

Step 2: Review Box 1 (Output VAT)

Check that the output VAT figure looks reasonable:

Compare with the previous quarter. Is the figure broadly consistent? If revenue hasn't changed significantly, the VAT shouldn't either.
Check for any unusually large or small invoices that might have been miscoded.
If you have zero-rated or exempt sales, make sure they're not accidentally bundled with standard-rated VAT.

Step 3: Review Box 4 (Input VAT)

Check that the input VAT figure is reasonable:

Have you included all purchase invoices for the period?
Are there any purchases where you shouldn't be reclaiming VAT (entertainment, non-business items)?
If you're partly exempt or on the Flat Rate VAT scheme, have you applied the correct calculation?

Step 4: Review Boxes 6 and 7

These should reconcile broadly with your profit and loss figures for the period. If your Box 6 (sales) is significantly different from your revenue on the P&L, investigate why.

Step 5: Check for common errors

Duplicate invoices — Has any invoice been entered twice? (More common than you'd think, especially with recurring payments.)

Missing invoices — Are there any invoices from the period that haven't been entered?

Wrong VAT rate — Are all transactions coded with the correct VAT rate?

Personal expenses — Has any personal spending accidentally been included in business purchases?

Capital items — Have large capital purchases been treated correctly?

Step 6: Make adjustments

If you find errors, correct them in your accounting records before submitting the return. Common adjustments include:

Bad debt relief for invoices over six months old that are written off
Reverse charge adjustments for construction services
Partial exemption calculations
Corrections from previous periods (if minor — significant errors need a separate disclosure to HMRC)

Step 7: Submit through MTD-compatible software

Under Making Tax Digital, you must submit your VAT return through MTD-compatible software. Navigate to the VAT filing section, confirm the figures, and submit. The software communicates with HMRC's systems and sends the data digitally. You'll receive a confirmation of receipt.

Step 8: Arrange payment

If Box 5 shows you owe HMRC, arrange payment by the deadline—one month and seven days after the end of the VAT period. Payment methods include direct debit (recommended—set it up once and payments happen automatically), online bank transfer, or card.

If Box 5 shows HMRC owes you, the refund is usually paid within 30 days, though HMRC may request additional information before processing.

Deadlines and penalties

Filing and payment deadline: One month and seven days after the end of the VAT period. For a quarter ending 31 March, the deadline is 7 May.

Late filing: Under the points-based system, each late return earns a point. Quarterly filers reach the penalty threshold at 4 points, triggering a financial penalty. Points expire after a period of compliance.

Late payment: Late payment triggers penalties calculated as a percentage of the outstanding tax, plus daily interest.

Direct debit advantage: If you pay by direct debit, HMRC automatically collects the payment three working days after the deadline. This gives you slightly longer and eliminates the risk of forgetting the payment entirely.

How to make VAT returns less painful

Keep your bookkeeping current. If your bookkeeping is up to date, the VAT return is a 15-minute review-and-submit job. If it's not, the return becomes a multi-day catch-up exercise. The difference is worth planning for.

Reconcile monthly. Monthly bank reconciliation ensures your records are accurate and complete by the time the VAT return is due. It also catches errors while they're easy to fix.

Set reminders. Set a reminder two weeks before each VAT deadline. This gives you time to complete outstanding bookkeeping, review the figures, and submit without rushing.

Save for VAT. If you're collecting 20% VAT on your sales, that money is not yours—it belongs to HMRC. Set aside the VAT you collect in a separate bank account so it's always available when the return is due. This prevents the common problem of spending the VAT money and then struggling to pay the bill.

Use direct debit. Set up a direct debit with HMRC for VAT payments. This eliminates the risk of missed payments and the penalties that come with them.

Use accounting software. If you're still managing VAT manually, stop. Accounting software that integrates your sales invoices, purchase invoices, and bank feeds will calculate the nine boxes correctly and flag errors before you submit. This is one of the few areas where investing in software pays for itself in a single quarter.

If you're VAT-registered and managing multiple tax obligations, an integrated accounting platform that handles bookkeeping, VAT, and tax reporting in one place removes most of the stress. The return becomes a review rather than a reconstruction.

Frequently Asked Questions

What if I've made a mistake on a previous VAT return?

Minor errors (under £10,000 in value) can be corrected on your next return using the voluntary disclosure method. Larger errors need to be reported separately to HMRC. If you discover an error after submission but before HMRC's inquiry period ends (typically four years), contact them immediately. It's better to flag it than to hope they don't notice.

Can I reclaim VAT on fuel for my business vehicle?

You can reclaim VAT on fuel only if you keep detailed records of business mileage. If you claim a flat rate per mile instead (using HMRC's approved rates), you cannot reclaim VAT. If you use fuel for mixed business and personal use, you can only reclaim the business portion. Most sole traders and small businesses find the mileage allowance simpler and more tax-efficient.

Do I need to keep invoices for VAT purposes?

Yes. You must keep all invoices and purchase records for six years. HMRC can ask to see them if they audit your return. Digital copies are fine (so long as they're legible), and many accounting systems store them automatically. Losing records is not an excuse.

What's the difference between standard-rated, reduced-rated, and zero-rated VAT?

Standard-rated is 20% (most goods and services). Reduced-rated is 5% (some items like domestic fuel, energy-saving materials, and certain foods). Zero-rated is 0% (books, newspapers, most food, children's clothing, and new builds). If you're unsure which rate applies to your products or services, gov.uk has a VAT rates guide.

What happens if I don't file my VAT return on time?

You'll incur penalties under the points-based penalty system. One point per late return. At four points, you face a financial penalty (typically £200 for the first point reached). Additionally, HMRC charges daily interest on any unpaid VAT. The penalties compound, so it's much cheaper to file late than to ignore it entirely.

Can I claim VAT back if I'm not VAT-registered?

No. You must be registered for VAT (or be a VAT-registered business) to reclaim input VAT. If your turnover is below the VAT threshold (currently £90,000 per year), you're not required to register, but you also can't reclaim VAT on your purchases. Some small businesses choose to register voluntarily if they're selling to other VAT-registered businesses, as it improves their competitiveness (no VAT on their invoice).

What software do I need to file a VAT return?

You need MTD-compatible accounting software. Most modern accounting packages (Xero, QuickBooks, FreshBooks, Relentify, etc.) are compatible. Spreadsheets don't count—HMRC won't accept VAT returns filed via Excel, even if you've done the maths perfectly. The software integrates with HMRC's systems directly.

Is there any way to reduce how much VAT I owe?

If you're eligible, the Flat Rate Scheme can reduce VAT payments by calculating VAT as a flat percentage of turnover rather than calculating input and output VAT separately. It suits some businesses (particularly those with low input VAT) but not others. Review the scheme to see if it works for you, but once you opt in, you're locked in for two years.

VAT returns are a routine part of running a VAT-registered business. With good bookkeeping habits, reliable software, and a consistent review process, they become a straightforward administrative task rather than a source of dread.