Flat Rate VAT Calculator

Use the flat rate VAT calculator

Pop your numbers into the tool above: your VAT-inclusive turnover for the period, the flat rate percentage HMRC has set for your trade sector, and whether you are in your first year of registration. It returns the VAT you would pay under the Flat Rate Scheme and contrasts it with standard 20% VAT accounting so the better option is obvious.

How the Flat Rate Scheme works

Under standard VAT, you charge customers 20%, reclaim the VAT on your purchases, and pay HMRC the difference each quarter. The Flat Rate Scheme simplifies that. You still charge your customers the normal 20% on your invoices, but instead of tracking input VAT on every purchase, you pay HMRC a single fixed percentage of your gross (VAT-inclusive) turnover. The catch is in that word gross, and it trips a lot of people up.

The plain-English formula is:

Flat Rate VAT to pay = VAT-inclusive turnover × your sector flat rate %

Your VAT-inclusive turnover is everything you invoiced including the 20% VAT you added. So if you billed a client £1,000 plus £200 VAT, the figure you apply the flat rate to is £1,200, not £1,000. The flat rate percentage itself depends on your trade — HMRC publishes a list of sector rates, and you select yours rather than us assuming it. There is also a 1% reduction in your first year of VAT registration, and a special higher rate for so-called “limited cost traders” who spend very little on goods.

The trade-off: on the scheme you generally cannot reclaim VAT on your purchases (with a limited exception for capital assets costing £2,000 or more in a single invoice). So the scheme tends to suit service businesses with low VATable costs — consultants, designers, writers, contractors — and works less well for businesses that buy a lot of stock or equipment. The standard 20%, 5% reduced and 0% zero rates still govern what you charge; the scheme only changes how much you remit. You can read the official rules on the gov.uk VAT Flat Rate Scheme page.

One reassuring point: VAT is a UK-wide tax. Unlike income tax (which has separate Scottish rates) or property tax (SDLT in England and Northern Ireland, LBTT in Scotland, LTT in Wales), the Flat Rate Scheme works identically whether you trade in Glasgow, Cardiff, Belfast or London.

Worked example: a freelance designer on the scheme

Say you are a self-employed graphic designer with £60,000 of net (ex-VAT) sales over the year. You charge clients the standard 20%, so you collect:

• VAT charged to clients: £60,000 × 20% = £12,000
• VAT-inclusive turnover: £60,000 + £12,000 = £72,000

Now assume your sector's flat rate is 12% (this is illustrative — check your own rate on gov.uk and enter it in the calculator). Your Flat Rate Scheme bill is:

• £72,000 × 12% = £8,640 paid to HMRC
• In your first year, knock off 1 percentage point: £72,000 × 11% = £7,920

Under standard VAT you would owe the £12,000 you collected, minus the VAT on your business purchases. If your designer's costs are low — a laptop, some software, a co-working desk — you might only reclaim, say, £1,500 of input VAT, leaving £10,500 to pay. Against the scheme's £8,640, you would keep roughly £1,860 more on the Flat Rate Scheme (and £2,580 in year one). That retained surplus is taxable income, so factor it into your self-employed tax calculation.

Worked example: when standard VAT wins

Now picture a small print business with the same £60,000 net turnover but £25,000 of VATable stock and materials. Input VAT reclaimable under standard accounting is £25,000 × 20% = £5,000, so the standard bill is £12,000 − £5,000 = £7,000. The Flat Rate Scheme at an illustrative 9.5% would cost £72,000 × 9.5% = £6,840 — almost identical, and once stock spend climbs the scheme quickly becomes the more expensive option because you forfeit those reclaims. This is exactly the comparison the calculator above is designed to make for your real figures.

2026/27 VAT rates

The flat rate percentage you pay is sector-specific, but the VAT you charge customers uses these standard rates, confirmed for the 2026/27 tax year:

Source: gov.uk VAT rates. Your individual flat rate percentage is set by HMRC according to your trade sector — look it up and enter it above rather than guessing, because picking the wrong category is a common error.

How to decide if the scheme is worth it

Run the numbers both ways before committing. The Flat Rate Scheme tends to pay off when your VATable purchases are low relative to turnover, when you value the simpler bookkeeping, and especially in your discounted first year. Watch for the limited cost trader test: if your spend on goods (not services) is below a set proportion of turnover, HMRC pushes you onto a higher flat rate that usually wipes out any benefit. Service businesses with few physical costs frequently fall into this band, so check it carefully.

Joining is something you do voluntarily once VAT-registered, and you can leave if it stops being worthwhile. If you are weighing up how you pay yourself alongside this, our dividend versus salary calculator and limited company tax calculator help you see the bigger picture. When it is time to file, the VAT return calculator helps you sense-check the figures, and the standard VAT calculator handles quick add-or-remove-VAT sums.

Common mistakes to avoid

• Applying the flat rate to net turnover. It goes on VAT-inclusive turnover. Forgetting the VAT you charged understates what you owe.
• Trying to reclaim input VAT anyway. On the scheme you generally cannot, except for one-off capital assets of £2,000 or more on a single invoice.
• Missing the limited cost trader rate. Low-goods businesses get bumped to a higher percentage; assuming your headline sector rate when you are caught by this test leads to underpaying.
• Forgetting the first-year discount expires. The 1% reduction only lasts 12 months from registration — budget for the full rate afterwards.
• Including exempt or outside-the-scope income in your flat rate turnover when it should be excluded.

These estimates are for guidance only and are not personal tax or financial advice; confirm your position with HMRC or a qualified accountant before acting.

Related calculators

Carry on with the VAT return calculator to prepare your quarterly figures, the self-employed tax calculator to see the income tax and National Insurance on your profits, and the contractor calculator if you operate through a limited company.