VAT Calculator UK 2026: How to Add and Remove VAT

VAT calculator UK searches usually start with the same small panic: you have an invoice in front of you, a figure that may or may not already include VAT, and no confidence about which way the maths runs. Add 20% to the wrong number and you have quietly undercharged yourself. Take 20% off the wrong number and you have overpaid HMRC. It happens to sole traders, freelancers, small business owners and anyone whose new job suddenly involves raising invoices. This guide walks you through exactly how VAT is calculated in 2026/27, why the reverse calculation is not simply “minus 20%”, what the current rates and thresholds are, and how to check your own figures without guessing.

VAT calculator UK maths is straightforward once you know the direction. To add VAT at the standard 20% rate, multiply the net figure by 1.2. To remove VAT from a gross figure, divide by 1.2, not subtract 20%. The UK standard rate is 20%, with a 5% reduced rate and a 0% zero rate, and the registration threshold is £90,000 of taxable turnover.

What VAT Actually Is

Value Added Tax is a consumption tax. It is charged on most goods and services sold in the UK, collected by businesses on HMRC’s behalf, and ultimately paid by the end customer.

If your business is VAT registered, you charge VAT on what you sell (output tax) and reclaim VAT on what you buy (input tax). You pay HMRC the difference. If you have bought more than you have sold in a period, you can end up with a refund.

The critical point for anyone using a VAT calculator UK tool is that VAT sits on top of the net price. It is not a slice taken out of a fixed total. That single fact explains why the reverse calculation trips so many people up.

UK VAT Rates in 2026/27

There are three UK VAT rates, and they have been stable for some time. The standard rate is 20%, unchanged since January 2011. The reduced rate is 5%, and the zero rate is 0%.

Zero-rated and exempt look identical on a receipt, because both show no VAT. The difference matters to businesses. If you sell zero-rated goods you are still making taxable supplies, so you can register and reclaim the VAT on your own costs. If you sell only exempt supplies, you generally cannot.

How to Add VAT to a Price

Adding VAT is the easy direction. You take the net price, the figure before tax, and apply the rate.

1. Take your net price. Say £500.
2. Multiply by 1.2 for the standard rate. £500 × 1.2 = £600.
3. The VAT element is the difference: £600 – £500 = £100.

For the 5% reduced rate, multiply by 1.05 instead. For zero-rated items, the gross and net are the same figure.

A quicker way to isolate the VAT alone at the standard rate: divide the net figure by 5. £500 ÷ 5 = £100. That works because 20% is one fifth.

How to Remove VAT (The Reverse Calculation)

This is where the errors creep in. Suppose you are handed a gross invoice for £600 including VAT at 20%, and you want to know the net figure.

The instinct is to take 20% off £600, which gives £480. That is wrong. The VAT was calculated on £500, not on £600, so the answer must be £500.

The correct method is to divide the gross by 1.2:

1. Gross figure: £600.
2. £600 ÷ 1.2 = £500 net.
3. VAT element: £600 – £500 = £100.

There is a well-known shortcut for the VAT element on its own at 20%: divide the gross by 6. £600 ÷ 6 = £100. Expressed as a percentage of the gross, VAT at 20% is 16.67%, not 20%. That gap of 3.33 percentage points is the single most common source of VAT arithmetic errors on small invoices.

For the 5% reduced rate, divide the gross by 1.05, or divide by 21 to get the VAT element directly.

Worked Examples at 20% and 5%

Here is a comparison table you can sanity-check your own figures against.

And the reduced rate, which most people meet on their household energy bill:

A real-world scenario

You are a freelance designer, newly VAT registered. A client agrees a fee of “£3,000” but nobody said whether that included VAT.

If £3,000 was meant to be net, you invoice £3,600 and keep £3,000. If the client meant £3,000 gross, you invoice £3,000, hand £500 to HMRC, and keep £2,500. That is a £500 swing on a single job, entirely down to one unasked question.

Always confirm in writing whether a quoted price is inclusive or exclusive of VAT before you start work. It is the cheapest admin you will ever do.

The £90,000 Registration Threshold

The VAT registration threshold is £90,000 of taxable turnover, raised from £85,000 in April 2024 and unchanged for 2026/27. Taxable turnover means everything you sell that is not exempt, including zero-rated sales.

Two triggers matter:

• The backward look. If your taxable turnover over any rolling 12 months exceeds £90,000, you must register. This is not the tax year, it is any consecutive 12-month window.
• The forward look. If you expect to exceed £90,000 in the next 30 days alone, for example because you have just landed one very large contract, you must register immediately.

You have 30 days from the end of the month in which you crossed the threshold to register. Miss it and HMRC can charge you the VAT you should have collected, which comes out of your own pocket if the customer has already paid.

The deregistration threshold is £88,000. If turnover falls below that and you expect it to stay there, you can apply to come off the register.

Should you register voluntarily?

You can register below the threshold. Whether that helps depends on who your customers are. If you sell mainly to other VAT-registered businesses, they reclaim the VAT you charge, so registering costs them nothing and lets you reclaim VAT on your own equipment and software. If you sell mainly to consumers, adding 20% makes you 20% more expensive overnight, and that is a real competitive hit.

VAT Schemes That Change the Maths

HMRC runs several simplification schemes, and each changes how the numbers work.

The Flat Rate Scheme percentages vary by trade, running from around 4% for retailers of food and children’s clothing up to 16.5% for what HMRC calls limited cost traders, meaning businesses that spend very little on goods. If most of your cost base is your own time rather than materials, check the limited cost trader rules carefully before assuming the scheme saves you money.

Making Tax Digital and Filing

Every VAT-registered business, regardless of turnover, must keep digital records and submit VAT returns through Making Tax Digital compatible software. The old manual entry through the HMRC portal is gone.

Most businesses file quarterly. The deadline for both submitting the return and paying is one calendar month and seven days after the end of the VAT period. So a quarter ending 31 March has a filing and payment deadline of 7 May.

HMRC operates a points-based penalty system for late submissions. Each late return earns a point, and once you hit the threshold for your filing frequency, a fixed penalty applies. Late payment penalties are charged separately and increase the longer the debt goes unpaid.

If bookkeeping software is unfamiliar territory, this is one of the highest-return skills a small business owner can pick up. Building solid spreadsheet fundamentals first makes accounting software far less intimidating, and Coffee & Study’s free Excel courses are a sensible starting point before you commit to a paid bookkeeping package.

What This Means If You Are Employed, Not Self-Employed

If you are on PAYE, VAT does not touch your payslip. It is not deducted from your wages and it does not appear alongside income tax and National Insurance. If you are trying to work out what lands in your bank account each month, that is a different calculation entirely, and our guide to how to read a UK payslip in 2026 covers the deductions that actually apply to you.

Where VAT does become your problem as an employee is if your role involves purchasing, invoicing, credit control or bookkeeping. Getting the reverse calculation right is a small but genuinely valued competence in finance and admin roles. If you are heading in that direction, our overview of accounting and finance jobs in the UK sets out the typical routes and pay.

Freelancers and contractors sit in between. You may be VAT registered while also dealing with tax codes and payments on account. If you work through an agency or umbrella arrangement, our explainer on UK tax codes is worth reading alongside this one, because the two systems are often confused.

Common Mistakes to Avoid

Subtracting 20% instead of dividing by 1.2

By far the most frequent error. On a £600 gross invoice, subtracting 20% gives £480 and understates your net income by £20. Repeat that across a year of invoices and it becomes a real gap in your records. Divide by 1.2, or divide by 6 to get the VAT element alone.

Quoting a price without saying whether it includes VAT

Ambiguity always resolves in the customer’s favour once the work is done. State “plus VAT” or “including VAT” on every quote, proposal and email. If you deal with consumers, advertised prices must be VAT inclusive anyway.

Charging VAT before your registration number arrives

You cannot issue a VAT invoice without a VAT number. If you have applied and are waiting, the accepted approach is to raise invoices for the VAT-inclusive total without showing VAT separately, then reissue proper VAT invoices once your number comes through. Charging VAT you are not yet registered to charge is a straightforward compliance problem.

Treating zero-rated and exempt as the same thing

They look identical on a receipt but behave very differently. Zero-rated sales count towards your £90,000 threshold and let you reclaim input VAT. Exempt sales generally do neither. Businesses selling a mix of both need to apportion their input VAT, which is where professional advice pays for itself.

Forgetting that the threshold is a rolling window

Plenty of business owners check their turnover only at the year end and get an unpleasant surprise. The test is any consecutive 12 months, so a strong autumn can push you over in November even if the tax year total looks comfortable. Check monthly if you are anywhere near £90,000.

Frequently Asked Questions

How do I calculate VAT backwards from a total?

Divide the gross figure by 1.2 for the standard 20% rate. That gives you the net amount. Subtract the net from the gross to get the VAT element, or take the shortcut of dividing the gross by 6. For the 5% reduced rate, divide the gross by 1.05, or divide by 21 for the VAT element on its own. Never simply subtract 20% from a gross figure, because the VAT was calculated on the smaller net amount, not the total.

What is the VAT rate in the UK in 2026?

The UK standard VAT rate is 20% and has been since January 2011. There is also a 5% reduced rate covering things like domestic fuel and power, children’s car seats and certain home energy-saving materials, and a 0% zero rate covering most food, books, newspapers, children’s clothing and prescription medicines. Some supplies, including insurance and most financial services, are exempt rather than zero-rated, which is a separate category.

When do I have to register for VAT?

You must register once your taxable turnover exceeds £90,000 in any rolling 12-month period, or if you expect to exceed £90,000 in the next 30 days on its own. Registration must be completed within 30 days of the end of the month in which you crossed the threshold. You can also register voluntarily below the threshold, which often makes sense if your customers are themselves VAT-registered businesses.

Is VAT taken off my salary?

No. VAT is a tax on goods and services, not on employment income. Your payslip deductions are income tax, National Insurance, pension contributions and any student loan repayment. VAT only becomes relevant to you personally if you run a business, freelance, or work in a role that involves handling invoices and purchasing.

What is the difference between zero-rated and exempt?

Both mean the customer pays no VAT, but the consequences for the seller differ. Zero-rated supplies are taxable at 0%, so they count towards your registration threshold and you can reclaim VAT on related costs. Exempt supplies fall outside the VAT system, so they generally do not count towards the threshold and you cannot reclaim input VAT on the costs of making them.

Do I need software to file a VAT return?

Yes. Making Tax Digital rules require all VAT-registered businesses to keep digital records and submit returns through compatible software. Manual submission through the old HMRC portal is no longer available. Options range from full accounting packages to lightweight bridging software that connects an existing spreadsheet to HMRC.

Getting comfortable with VAT is one of those skills that quietly opens doors, whether you are running your own business or moving into a finance, admin or purchasing role. If you are looking for your next step, browse the latest UK job vacancies on UK Jobs Alert to see which employers are hiring for finance and administration roles right now.