UK VAT calculator

To calculate UK VAT, start from whether your figure already includes the tax. To add VAT to a net price, multiply it by one plus the rate: at the standard rate of 20% set by HMRC the multiplier is 1.2, so £250.00 becomes £300.00 and the tax is £50.00. To take VAT out of a gross price, divide by the same multiplier instead of subtracting the percentage, so £150.00 holds £125.00 before tax and £25.00 of VAT. The reduced rate of 5% and the zero rate work in exactly the same way with their own multipliers. Every result is rounded to the penny, which is why taking tax out and putting it back can land a penny away. Between businesses the net figure is the one to compare, since a registered buyer reclaims the tax as input tax. Both directions are among the checked cases below.

Going from a net price to a gross one is a single multiplication. At the standard rate the multiplier is 1.2, so a net price of £250.00 becomes £300.00, of which £50.00 is tax. The same logic holds at any rate: one plus the rate, expressed as a decimal.

Going the other way is where most errors happen. To find the net price inside a figure that already includes tax, divide by that same multiplier rather than subtracting the percentage. A receipt for £150.00 at the standard rate contains £125.00 of goods and £25.00 of tax.

The VAT fraction

HMRC describes the shortcut for extracting tax from a gross amount as the VAT fraction. At 20% it is one sixth, because twenty parts of tax sit inside every hundred and twenty parts of price. At 5% it is one twenty-first. Multiplying a gross total by the fraction gives the tax directly, which is how the calculator arrives at the same answer the long way round.

HMRC sets three rates, and the table shows which everyday goods and services usually fall under each one.

The standard rate is the default. A supply is standard rated unless legislation places it somewhere else, so the useful question is never whether something qualifies for 20% but whether it qualifies for anything lower.

The reduced rate is narrow and often misapplied. Energy bills show why: gas and electricity for a home are charged at 5%, so a quarterly bill of £84.00 holds £4.00 of tax. The same supply to business premises is normally standard rated, because the relief exists for domestic use.

Food illustrates the zero rate and its limits. Groceries for eating at home carry no VAT, yet hot food, crisps, sweets, soft drinks and alcohol are standard rated, and so is most food eaten on the premises of a café or restaurant. The boundary is drawn by product and by circumstance rather than by whether something counts as food in everyday speech.

Both leave the customer paying no tax, which is why they are so often confused. For the seller they could hardly be more different.

A zero-rated supply is taxable. It is simply taxed at nothing. The business still counts it towards its turnover, still files returns, and can reclaim the input tax it paid on costs related to those sales. A bookshop pays VAT on its rent and shelving and gets that money back.

An exempt supply sits outside the tax altogether. Insurance, most financial services, education, health care by registered practitioners and residential lettings fall here, which is why the interest on a personal loan carries no VAT; the loan calculator shows what such borrowing costs instead. Because nothing is charged on the way out, input tax on related costs usually cannot be recovered, so it becomes a real cost to the business.

• Zero-rated sales count towards the registration threshold; exempt sales do not.
• Input tax is recoverable against zero-rated sales and generally not against exempt ones.
• A business making only exempt supplies cannot register at all, while one making only zero-rated supplies can.

Registration becomes compulsory once taxable turnover passes £90,000 (HMRC) in any rolling twelve-month period. That window moves every month, so a business checks at each month end whether the previous twelve months together cross the line. There is also a forward test: if turnover in the next thirty days alone is expected to exceed the threshold, registration is due immediately.

Registering below the threshold is allowed and sometimes sensible. A business selling mostly to other VAT-registered businesses loses little, since its customers reclaim the tax, while gaining the ability to recover input tax on its own costs. One selling to the public adds the full rate to its prices or absorbs it from its margin.

Once registered, records and returns go through Making Tax Digital (VAT Notice 700/22), which means keeping digital records and submitting through compatible software. Smaller businesses can apply for the Flat Rate Scheme, which replaces the normal calculation with a fixed percentage of gross turnover that depends on the trade. How each rate and threshold here was checked is set out in the methodology.

A full invoice from a registered business to another business needs, at a minimum:

• A unique, sequential invoice number, the date of issue and the time of supply if it differs
• The supplier's name, address and VAT registration number, and the customer's name and address
• A description of the goods or services, with quantities
• The price excluding tax and the rate applied to each line
• The total tax charged, shown in sterling

For retail sales up to £250 including tax (VAT Notice 700/21), a simplified invoice is enough, showing the total with tax included and the rate. Prices shown to consumers must include VAT; quoting net figures to the public is only acceptable where the tax is made equally clear.

Visitors from the United States often expect this calculator to handle sales tax, and the two are not interchangeable. VAT is charged at every stage of a supply chain, with each business reclaiming the tax it paid, so only the final consumer bears the cost. American sales tax is collected once, at the point of retail sale, at a rate that varies by state, county and city. For a US figure, use the custom rate with the combined local percentage.

Since 1 January 2021 Great Britain has operated outside the EU VAT area. Goods exported from Great Britain are generally zero-rated, and goods arriving from abroad are subject to import VAT. Northern Ireland follows EU rules for goods under the Windsor Framework, which is why trade across the Irish Sea is treated differently from trade with the rest of the United Kingdom.

Most errors come from treating the rate as a discount on the gross price, or from charging the wrong rate on a supply that sits near a boundary.

1. Taking 20% off a gross price. Removing 20% from £120.00 gives £96.00, but the net value inside £120.00 is £100.00. Every reverse calculation done this way understates the price and overstates the tax.
2. Rounding each line differently from the invoice total. HMRC accepts rounding per line or on the total, provided the method is applied consistently.
3. Treating zero-rated and exempt supplies as the same thing, and losing input tax that could have been reclaimed, or claiming input tax that cannot be.
4. Applying the 5% energy rate to business premises, where the standard rate normally applies.
5. Leaving zero-rated sales out of the turnover test, and registering late as a result.