How to File a VAT Return: Step-by-Step Guide

Filing a VAT return is one of those tasks that fills many business owners with dread. The jargon, the boxes, the deadlines -- it can all feel overwhelming, especially if you're doing it for the first time. But here's the thing: once you understand what each box means and get your process right, VAT returns become routine. Not exciting, perhaps, but certainly manageable.

I'm Penny, and I've guided thousands of businesses through their VAT returns. Whether you're filing for the first time or looking to improve your process, this step-by-step guide will walk you through everything you need to know.

Before You Start: What You'll Need

Before diving into the return itself, make sure you have the following ready:

Your VAT registration details. You should know your VAT number, your VAT accounting period dates, and which scheme you're on (standard, flat rate, or cash accounting).

Complete sales records. Every invoice you've issued during the period, including the VAT amount, the net amount, and the gross total. Under Making Tax Digital, these should already be in your digital accounting software.

Complete purchase records. Every VAT receipt and invoice for business purchases during the period. Again, these should be recorded digitally.

Bank statements. Useful for cross-checking that you've captured everything and haven't missed any transactions.

Any adjustments. Bad debt relief claims, corrections from previous periods, or partial exemption calculations if applicable.

If you're using MTD-compatible software like Accounted, much of this data will already be organised and categorised for you. The software populates the VAT return boxes automatically, which eliminates most of the manual work.

Step 1: Review Your Sales (Output Tax)

Start by reviewing all the sales you've made during the VAT period. You need to account for every taxable supply, broken down by VAT rate:

• Standard rated (20%): Most goods and services in the UK
• Reduced rate (5%): Things like domestic fuel, children's car seats, and certain energy-saving materials
• Zero rated (0%): Food (most types), children's clothing, books, newspapers, and exports

Each category needs to be totalled separately because they feed into different boxes on the return. If you've made any exempt supplies (like certain financial services or education), note those too -- they don't appear in your VAT calculation but do affect your input tax recovery if you're partially exempt.

Check that every invoice has been recorded. A common mistake is missing sales invoices that were issued close to the period end. If you raised an invoice on the last day of the quarter, it needs to be included in that quarter's return (unless you're on the cash accounting scheme, in which case it's based on when you received payment).

For a deeper understanding of common filing errors, our guide on common VAT mistakes is worth reading alongside this one.

Step 2: Review Your Purchases (Input Tax)

Next, review your purchase records. You can reclaim VAT on legitimate business expenses, but only if you have a valid VAT invoice as evidence. This is non-negotiable -- HMRC can disallow claims where you can't produce the supporting documentation.

A valid VAT invoice must include:

• The supplier's name and address
• Their VAT registration number
• The invoice date
• A unique invoice number
• Your name and address (for invoices over £250)
• A description of the goods or services
• The total excluding VAT, the VAT amount, and the total including VAT

For purchases under £250, a simplified invoice is acceptable (like a till receipt), but it must still show the supplier's VAT number and the VAT rate applied.

Go through your purchase records systematically. Check that everything is properly categorised, that you haven't accidentally included personal expenses, and that all VAT amounts are correctly recorded. Our guide on reclaiming VAT on business expenses covers what you can and can't claim in detail.

Step 3: Understand the Nine Boxes

The VAT return has nine boxes. Here's what each one means:

Box 1 -- VAT due on sales and other outputs. The total VAT you've charged on all your sales during the period. This includes standard-rated, reduced-rate, and any reverse charge amounts.

Box 2 -- VAT due on acquisitions from EU member states. If you've acquired goods from EU countries, the VAT due on those goes here. Post-Brexit rules have changed this area significantly.

Box 3 -- Total VAT due. This is simply Box 1 plus Box 2. Your software calculates this automatically.

Box 4 -- VAT reclaimed on purchases and other inputs. The total VAT you're reclaiming on business purchases, including any VAT on EU acquisitions (which you charge to yourself in Box 2 and reclaim here).

Box 5 -- Net VAT to pay or reclaim. Box 3 minus Box 4. If it's positive, you owe HMRC. If it's negative, HMRC owes you a refund.

Box 6 -- Total value of sales excluding VAT. The net value of all your sales and outputs, excluding VAT. This includes zero-rated and exempt sales.

Box 7 -- Total value of purchases excluding VAT. The net value of all your purchases and inputs, excluding VAT. This includes zero-rated and exempt purchases.

Box 8 -- Total value of supplies of goods to EU member states. The net value of goods (not services) supplied to EU countries.

Box 9 -- Total value of acquisitions of goods from EU member states. The net value of goods (not services) acquired from EU countries.

If this sounds complicated, don't worry. Modern MTD-compatible software calculates and populates these boxes from your transaction data. You just need to review them for accuracy. HMRC has full guidance on completing each box in VAT Notice 700/12.

Step 4: Check for Common Errors

Before submitting, review these common error points:

Timing. Make sure all transactions are in the correct period. An invoice dated 31 March belongs in the January-March quarter, not the April-June quarter (unless you're using cash accounting).

Personal expenses. Double-check that no personal purchases have slipped into your business records. This is especially common with fuel, mobile phone bills, and meals.

Exempt vs. zero-rated. These are different. Zero-rated supplies are taxable at 0% and count towards your taxable turnover. Exempt supplies are outside the VAT system entirely and can restrict your input tax recovery.

Round numbers. Be suspicious of perfectly round figures. Real business records rarely produce perfectly round VAT totals, and HMRC's systems flag this.

Reverse charges. If you've received services from overseas suppliers or work in construction covered by the domestic reverse charge, make sure these are accounted for correctly in both Box 1 and Box 4.

Credit notes. Any credit notes you've issued reduce your output tax. Any credit notes you've received from suppliers reduce your input tax. Make sure these are included.

Step 5: Submit via Making Tax Digital

Since April 2022, all VAT-registered businesses must submit their returns through MTD-compatible software. You can no longer submit directly through the HMRC website (except in very limited circumstances).

Your software will connect to HMRC's systems via an API and submit the return digitally. The process typically involves:

1. Reviewing the populated return in your software
2. Confirming the figures are correct
3. Clicking submit
4. Receiving a confirmation receipt with a unique reference number

Keep that confirmation receipt. It's your proof of submission.

If you're not yet set up for MTD, our Making Tax Digital complete guide explains everything you need to do. And if you're looking for software that makes the whole process painless, Accounted handles MTD submission with a few clicks -- I'll even flag potential errors before you submit.

Step 6: Pay What You Owe (or Claim Your Refund)

If Box 5 shows a positive figure, you need to pay HMRC. The deadline for both submission and payment is one calendar month and seven days after the end of the VAT period. So for a January-March quarter, the deadline would be 7 May.

Payment methods include:

• Direct Debit: Set this up through your HMRC online account. HMRC collects payment automatically around three working days after the due date, giving you the maximum time to pay.
• Online banking / Faster Payments: Usually arrives same day or next working day. Use the correct reference (your VAT registration number).
• BACS: Takes three working days, so submit early.
• CHAPS: Same-day but your bank may charge a fee.

Avoid cheques if possible -- they take longer to process and HMRC is phasing them out.

If Box 5 is negative, HMRC should process your refund within 30 days. They may contact you to verify the claim, particularly if it's your first refund or the amount is unusually large. Keep your records handy.

Step 7: File and Move On

Once submitted and paid, file your records properly. Under HMRC rules, you must keep VAT records for at least six years. Digital records stored in MTD-compatible software satisfy this requirement, but make sure your data is backed up.

Note the next period's deadline in your calendar immediately. The quarterly cycle doesn't stop, and missing a deadline results in penalty points under HMRC's new system. You can check the penalty points thresholds on GOV.UK.

Tips for a Smoother VAT Return Process

Having helped thousands of businesses through this process, here are my top recommendations:

Reconcile monthly, not quarterly. Don't leave everything until the return is due. Check your records against your bank statements every month so any discrepancies are caught early.

Photograph or scan receipts immediately. Paper fades, gets lost, and ends up in the washing machine. Digital copies stored in your accounting software are safer and HMRC-compliant.

Separate your VAT money. Consider setting aside 20% of every VAT-inclusive payment you receive into a separate savings account. When the bill comes due, the money is already there.

Use the right scheme. If you're on standard accounting but would benefit from cash accounting or the flat rate scheme, explore your options. Our quarterly VAT returns guide and VAT Flat Rate Scheme guide can help you decide.

Don't leave submission to the last day. Technical issues, forgotten passwords, and software glitches always happen on deadline day. Aim to submit at least a week early.

Review the return yourself. Even if your software generates it automatically, spend five minutes checking the figures look reasonable. Does the output tax roughly match 20% of your net sales? Does the input tax look proportionate to your spending? A quick sense-check can catch major errors.

What If You Make a Mistake?

Mistakes happen. If you discover an error on a previously submitted return, you can usually correct it on your next return (by adjusting the figures) provided:

• The error is no more than £10,000, or
• The error is between £10,000 and £50,000 and is no more than 1% of the Box 6 figure on the return where you're making the correction

For larger errors, you need to notify HMRC separately using form VAT 652. Deliberate errors should always be disclosed to HMRC immediately -- the penalties for deliberate concealment are severe.

Our guide on common VAT mistakes that cost businesses thousands covers the most frequent errors and how to avoid them.

The Bottom Line

Filing a VAT return is a process, not a mystery. With proper records, the right software, and a systematic approach, it takes minutes rather than hours. The key is staying on top of your bookkeeping throughout the quarter rather than scrambling at deadline time.

If you want the simplest possible VAT return experience, try Accounted and let me do the heavy lifting. I'll categorise your transactions, calculate your return, flag any issues, and submit to HMRC -- all MTD-compliant, all in one place. You can also compare our features against Xero if you're evaluating your options.

VAT returns are a fact of business life, but they don't need to be a source of stress. Get your process right, and you'll wonder what all the fuss was about.

Accounted handles VAT returns and MTD for VAT with direct HMRC filing built in. See VAT features →