VAT Return Calculator: Work Out the VAT You Owe HMRC

Use the VAT return calculator above

Enter the total VAT you've charged on sales (your output VAT) and the total VAT you've reclaimed on purchases (your input VAT). The tool subtracts one from the other and shows the net VAT due to HMRC, or the refund owed to you if you've paid out more VAT than you collected. Use it as a fast check, then reconcile against your bookkeeping records before you submit.

What a VAT return actually is

A VAT return is the quarterly summary you send HMRC declaring how much VAT you charged your customers and how much you paid your suppliers. You're acting as an unpaid tax collector: you add VAT to your invoices, hold it, and hand the balance over four times a year. The return itself is the reconciliation that tells HMRC, and you, exactly what that balance is.

Most VAT-registered businesses are on the standard accounting scheme and file every three months. The deadline to both submit the return and pay is one calendar month and seven days after the end of the VAT period. So a quarter ending 31 March has a deadline of 7 May. Miss it and you risk late-submission penalty points and late-payment interest, which is why a quick VAT return calculator check before the deadline is worth the thirty seconds.

Output VAT vs input VAT: the two halves of every return

Everything on a standard VAT return comes down to two numbers, and getting them straight is the whole game.

• Output VAT is the VAT you add to your own sales. If you invoice a client £2,000 plus VAT, you charge £400 of output VAT (£2,000 x 20%). That £400 isn't yours to keep, it belongs to HMRC.
• Input VAT is the VAT you pay on business purchases: stock, software subscriptions, fuel, professional fees, equipment. If your accounting software costs £30 plus £6 VAT a month, that £6 is input VAT you can usually reclaim.

Your VAT return is simply output VAT minus input VAT. When you've charged more than you've paid, you owe HMRC the difference. When you've spent heavily on stock or equipment and paid out more VAT than you collected, HMRC refunds you. The standard VAT rate in the UK is 20%, with a reduced 5% rate on things like domestic energy and a 0% zero rate on most food and children's clothing.

How VAT payable is calculated

The formula behind this VAT return calculator is short:

VAT payable to HMRC = Output VAT (on sales) − Input VAT (on purchases)

If the answer is positive, that's your payment. If it's negative, that's your refund. To work out the VAT element of any standard-rated figure, the maths is:

• Adding VAT to a net price: VAT = net x 0.20, so a £1,000 net sale carries £200 VAT.
• Extracting VAT from a gross (VAT-inclusive) total: VAT = gross ÷ 6. A £1,200 gross invoice contains £200 of VAT (£1,200 ÷ 6).

That divide-by-six shortcut only works for the 20% standard rate, and it catches a lot of people out. If a receipt is VAT-inclusive at 20%, you never multiply the whole total by 20% to find the VAT, you divide by six. Multiplying £1,200 by 20% gives £240, which is wrong; the real VAT inside that £1,200 is £200.

VAT is UK-wide, so the rate and the return process are identical whether you trade in England, Scotland, Wales or Northern Ireland. Unlike income tax (which has separate Scottish bands) or stamp duty (a different tax in each nation), there's no regional VAT split to worry about. One scheme, one set of rates, one HMRC.

Standard scheme vs the Flat Rate Scheme

This calculator assumes you're on standard VAT accounting, where you track every penny of output and input VAT and pay the difference. There's an alternative for smaller businesses called the Flat Rate Scheme, where you pay a fixed percentage of your gross turnover and generally don't reclaim input VAT on most purchases. The percentage depends on your trade sector.

The two schemes can produce very different bills. A consultant with low expenses often pays less under the Flat Rate Scheme, while a retailer buying lots of stock usually does better on standard accounting because they can reclaim all that input VAT. If you're weighing them up, run your numbers through our Flat Rate VAT calculator and compare the result with the standard figure this tool gives you. And if you just need to add or strip VAT from a single price rather than reconcile a whole return, the VAT calculator does exactly that.

Worked example: a freelance designer's quarter

Take Priya, a self-employed graphic designer in Leeds, VAT-registered and on the standard scheme. Over the January-to-March quarter she invoices clients £24,000 net for design work. Her business spending that quarter includes a new laptop, software subscriptions, a co-working desk and accountancy fees totalling £4,500 net.

Her VAT return works out like this:

• Output VAT on sales: £24,000 x 20% = £4,800
• Input VAT on purchases: £4,500 x 20% = £900
• VAT payable to HMRC: £4,800 − £900 = £3,900

So Priya owes HMRC £3,900 for the quarter, due by 7 May. The key thing she has to remember is that the £4,800 she collected was never her money to spend. A lot of newly registered freelancers treat a fat bank balance as profit, then get a nasty surprise when the VAT bill lands. Setting aside the VAT element of every invoice into a separate pot is the single habit that keeps this stress-free.

Worked example: a quarter with a refund

Now take Tom, who runs a small e-commerce shop. In one quarter he has a quiet sales period but buys in a large batch of stock ahead of Christmas.

• Output VAT on sales: £9,000 sales x 20% = £1,800
• Input VAT on stock and costs: £14,000 purchases x 20% = £2,800
• Net VAT position: £1,800 − £2,800 = −£1,000

Because Tom paid out £1,000 more VAT than he charged, he's in a refund position and HMRC pays him £1,000 back. Repayment returns can sometimes trigger a routine HMRC check, especially for newer businesses or unusually large reclaims, so it's worth keeping every purchase invoice tidy and to hand.

2026/27 UK VAT rates

VAT rates don't change with the tax year the way income tax thresholds do, but here are the current rates this calculator uses. Always confirm against HMRC before filing.

Source: gov.uk VAT rates. For the full return process and deadlines, see gov.uk VAT returns guidance.

Making Tax Digital for VAT

Since April 2022, all VAT-registered businesses must follow Making Tax Digital (MTD) for VAT. In practice that means you can't type figures straight into the old online form any more. You keep digital records and submit your return through MTD-compatible software that connects to HMRC.

That doesn't change the maths one bit, output VAT minus input VAT is still your bill, but it does mean this calculator is a sense-check rather than a filing tool. Work out your figure here, confirm it matches what your software is reporting, then submit through the software. If the two don't agree, you've usually missed an invoice or double-counted a purchase, and it's far cheaper to find that before you press submit than after.

Tips to keep your VAT bill manageable

• Ring-fence the VAT. Move the VAT portion of every sale into a separate savings account the moment it's paid. When the quarter ends, the money is already waiting.
• Reclaim everything you're entitled to. Software, mileage, professional fees, equipment and a fair share of mixed-use costs all carry reclaimable input VAT. Missing these inflates your bill.
• Check whether the Flat Rate Scheme is cheaper. Low-expense service businesses often come out ahead on flat rate; stock-heavy ones rarely do.
• Consider the Annual Accounting Scheme if lumpy quarterly bills hurt your cash flow; it lets you pay in instalments and file once a year.
• Keep digital records as you go, not in a panic the week before the deadline. MTD assumes a running record, and reconstructing a quarter from a shoebox of receipts is where errors creep in.

Common mistakes to watch for

• Multiplying a VAT-inclusive total by 20%. To find the VAT already inside a gross figure, divide by six, not multiply by 0.20. This is the most frequent arithmetic slip on a return.
• Reclaiming input VAT with no valid VAT invoice. HMRC can disallow input VAT if you can't produce a proper VAT invoice showing the supplier's VAT number. A bank statement line isn't enough.
• Reclaiming VAT on entertaining and most cars. Input VAT on business entertaining and on buying a car (unless it's exclusively for business use, which is a high bar) generally can't be reclaimed.
• Forgetting VAT on reverse-charge and imported services. Buy services from abroad and you may have to account for the VAT yourself under the reverse charge, adding it as both output and input VAT.
• Treating collected VAT as income. The output VAT in your account is HMRC's money. Spending it leaves you short when the bill is due, and late payment now attracts interest plus penalty points that build towards a fine.
• Filing late because the deadline is one month and seven days, not one month. That extra seven days catches people out every quarter.

These figures are estimates for guidance only and not personal tax or financial advice. Your exact VAT position depends on your scheme, your sector and the specifics of each transaction, so check with HMRC or a qualified accountant before filing.

Who should use this calculator

Works out the figures for a VAT return from your sales and purchases — output VAT charged, input VAT reclaimed, and the difference payable to or reclaimable from HMRC. It is the quarterly reality check for a registered business.

The point worth holding onto is that VAT collected is never your money. It sits in your account between collection and payment, which is why businesses that treat it as cash flow end up unable to pay the bill. Setting it aside as it comes in is the single habit that prevents the most common VAT problem there is.

What this calculator assumes

• Box 1 is output VAT on sales; Box 4 is input VAT reclaimed on purchases; the difference is due or reclaimable.
• Sales and purchases entered are net of VAT.
• The standard rate applies unless you specify otherwise.
• Accounting is on the standard basis rather than cash accounting.

Limitations — what it does not cover

• Cash versus accrual accounting, which changes when VAT falls due — cash accounting means you only pay once the customer has.
• The Flat Rate Scheme, which works completely differently — see the flat rate calculator.
• Partial exemption, where only some input VAT is recoverable.
• Blocked input VAT — client entertaining, and most cars.
• The reverse charge in construction and on certain services.
• Making Tax Digital, which requires returns to be filed from compatible software with digital links.

Related calculators

Once you've worked out your VAT, line up the rest of your business tax picture. If you run a limited company, estimate your bill with the corporation tax calculator. Sole traders and freelancers can check income tax and National Insurance together using the self-employed tax calculator. And to add or remove VAT from a single price rather than a whole return, the VAT calculator is the quickest route.