VAT Registration Threshold UK: The Complete 2026/27 Guide

The UK VAT registration threshold is £90,000 of taxable turnover in a rolling 12-month period (correct as of October 2026). Once you exceed it, you must notify HMRC within 30 days of the month-end and start charging VAT from the first day of the second month after. You can also register voluntarily below £90,000.

Crossing the threshold is a major administrative milestone for a growing small business. Get it right and VAT becomes routine. Get it wrong and HMRC can backdate your registration, leaving you to pay VAT out of your own pocket on sales you already made. This guide walks through the exact rules, a dated worked timeline showing when the obligation crystallises, the voluntary registration decision, and the mistakes that cost businesses money.

In short: You must register for UK VAT once your taxable turnover exceeds £90,000 in any rolling 12 months, or will within 30 days. Notify HMRC within 30 days of the month you crossed it; VAT applies from the first day of the second month after. Below £90,000, voluntary registration suits businesses that sell to VAT-registered customers.

This article gives general information only. It is not financial or tax advice. Tax rules and thresholds can change, so verify current figures on gov.uk or speak to a qualified accountant before you act.

What Is the VAT Registration Threshold?

The VAT registration threshold is the level of turnover at which HMRC requires your business to register for VAT. As of October 2026, that level is £90,000 of taxable turnover in any rolling 12-month period.

Three points in that definition matter enormously, and each one trips up growing businesses:

1. It is turnover, not profit. HMRC looks at your total taxable sales before any expenses are deducted. A business with £95,000 of sales and £90,000 of costs is over the threshold even though it barely breaks even.
2. It is a rolling 12 months, not a tax year or accounting year. The window slides forward one month at a time, and you are expected to check it at the end of every calendar month.
3. It is taxable turnover, not all income. Some types of income are excluded, which the next sections explain.

The £90,000 figure has been in place since 1 April 2024, when it rose from £85,000 after a freeze lasting since 2017. It was left unchanged at the Autumn Budget on 26 November 2025, so it applies through the 2026/27 tax year. The next scheduled opportunity for a change is the Autumn Budget on 28 October 2026, so check gov.uk for updates after that date.

The threshold applies to most UK business structures: sole traders, partnerships, limited companies and charities that trade. One important exception is businesses based outside the UK, which generally must register from their first UK taxable sale, with no £90,000 allowance. If you are based in Northern Ireland and buy goods from EU suppliers, separate acquisition rules can apply, so take specific advice.

How the Rolling 12-Month Test Works

The rolling test is the single most misunderstood part of VAT registration. HMRC does not wait for your year-end accounts. At the end of every calendar month, you look back at the previous 12 months and add up your taxable turnover. If the total is over £90,000, the registration clock starts.

Here is how the window slides for a growing business:

Notice that the business crossed the threshold during March, but the obligation is measured at the month-end. That gives you a clean, predictable deadline: 30 days from the end of the month in which you went over.

In practice, this means you need a running total of taxable turnover that you update monthly. A simple spreadsheet or your accounting software can do this automatically if your sales are recorded properly. Businesses that only discover the threshold at year-end, when their accountant spots it, are the ones that end up registering late.

What Counts Toward the £90,000?

Taxable turnover means the total value of supplies that are subject to VAT, even if the VAT rate on them is 0%. This is where many businesses undercount. The table below shows what to include and what to leave out.

Two inclusions surprise people. First, zero-rated sales count. If you export £60,000 of goods and sell £35,000 domestically, your taxable turnover is £95,000 and you must register, even though you charged 0% VAT on the exports. Exporters are caught by this regularly. Second, the test uses figures excluding VAT. If you are already charging VAT voluntarily, strip it out before comparing against £90,000.

If a large part of your income is exempt, such as a business mixing taxable consultancy with exempt financial advice, only the taxable portion counts. Mixed businesses should track the two streams separately from the start, because untangling them later is painful.

The 30-Day Rule: Two Ways Registration Becomes Compulsory

There are two separate triggers for compulsory registration. Either one is enough. They have different deadlines and different effective dates, so learn both.

Trigger 1: the backward-looking test

At the end of any calendar month, your taxable turnover for the previous 12 months exceeds £90,000. You must notify HMRC within 30 days of the end of that month. Your registration takes effect from the first day of the second month after the month in which you went over.

Using the table above: the threshold was crossed during March 2027, so the business must notify HMRC by 30 April 2027, and registration takes effect on 1 May 2027. From 1 May, every taxable sale must include VAT.

Trigger 2: the forward-looking test

At any point, you realise your taxable turnover will exceed £90,000 in the next 30 days alone. You must register by the end of that 30-day period, and your effective registration date is the date you formed that expectation.

This catches sudden large contracts. If you sign a £95,000 order on 10 September 2026 that you will fulfil within a month, you cannot wait for the rolling test to catch up. You register immediately, and you charge VAT on that order from 10 September.

One more rule worth knowing: you cannot dodge registration by splitting one business into two smaller ones to keep each under £90,000. HMRC has anti-avoidance powers (known as disaggregation) to treat artificially separated businesses as a single entity for VAT purposes.

A Dated Worked Timeline: From Crossing the Threshold to Charging VAT

This is the part most guides skip. Here is exactly how the dates fall for a fictional business, Harlow Marketing Ltd, a small agency whose growth tips it over the threshold in early 2027.

The monthly figures. Harlow’s taxable turnover (excluding VAT) for the 12 months to each month-end looks like this:

At 31 March 2027, the rolling total hits £90,850. The threshold is crossed. Now the legal timetable runs:

• By 30 April 2027: Harlow must notify HMRC and apply for VAT registration. This is 30 days from the 31 March month-end. Applying online through a Government Gateway account is the normal route, and HMRC usually confirms the registration and issues a VAT number within a few weeks, though it can take longer at busy periods.
• 1 May 2027: the effective date of registration, the first day of the second month after March. From this date, Harlow must charge VAT on all taxable sales. Quotes and proposals issued for work delivered on or after 1 May need to include VAT.
• 30 June 2027: Harlow’s first VAT return period ends (VAT periods are usually quarterly, and HMRC allocates the stagger). The return and payment are then due one calendar month and seven days after the period end.

What if Harlow had spotted it earlier? At 28 February the rolling total was £89,400, just £600 short. A business watching its monthly total would have seen the March crossing coming and could have prepared pricing and warned clients.

The forward-looking version. Suppose instead that on 10 September 2026 Harlow signs a single £95,000 contract to be delivered by early October. The backward-looking total is only £70,000, but the next-30-days test is met on 10 September. Harlow must register with an effective date of 10 September 2026 and charge VAT on that contract. Waiting for the rolling test would mean registering late and owing the VAT anyway.

The critical lesson in both versions: VAT is due from the effective date whether or not you charged it. If you register late, you cannot go back and add VAT to old invoices. The VAT comes out of your margin.

What Happens After You Register

From your effective date of registration, your obligations change immediately. Here is what to expect:

1. Charge VAT on taxable sales. Add VAT at the correct rate: 20% standard, 5% reduced or 0% zero-rated. Your prices to non-VAT-registered customers rise by the VAT amount unless you absorb it.
2. Issue proper VAT invoices to VAT-registered business customers, showing your VAT number, the rate applied and the VAT amount. Your customers need these to reclaim the VAT themselves.
3. Reclaim input VAT on allowable business purchases. Keep every VAT receipt. This is one of the genuine upsides of registration, and a good reason some businesses register voluntarily.
4. File VAT returns, usually every quarter. The deadline is one calendar month and seven days after the end of each VAT period, and the same deadline applies to payment. You must file even for periods where no VAT is due (a nil return).
5. Consider a VAT scheme. The Flat Rate VAT Scheme can simplify your returns if your turnover is modest, while cash accounting and annual accounting suit some businesses. Each has entry thresholds (the Flat Rate Scheme is open to businesses with VAT-exclusive turnover up to £150,000), so check the current figures on gov.uk.

Registration also feeds into your wider tax planning. VAT affects your pricing, your cash flow and the timing of major purchases, so it is worth reviewing alongside your tax planning strategies for small business owners once you are registered. The extra VAT you collect sits in your bank account until it is due to HMRC, which makes cash flow management more important, not less.

Making Tax Digital: What New Registrants Must Do

Every VAT-registered business must comply with Making Tax Digital (MTD) for VAT, with no exceptions for small or newly registered businesses. This has applied to all VAT registrations for several years, so treat it as part of registration itself, not an optional extra.

In practice, MTD for VAT means three things:

• Keep digital VAT records in HMRC-recognised compatible software from your effective date of registration. Paper ledgers and manual spreadsheets alone do not meet the standard.
• File your VAT returns through the software. The old option of typing figures into HMRC’s online portal is closed. Your software submits the return directly.
• Keep records for at least six years, and make sure the digital links between your records and your return are intact (no retyping figures between systems).

If you are registering because you crossed the threshold, choose your software during the registration window so you are ready to record VAT from your effective date. Good digital records from day one also make the quarterly VAT bill predictable, so you can plan for it in your business budget instead of being caught short.

Should You Register Voluntarily? A Decision Framework

You can register for VAT at any turnover level, even if you are nowhere near £90,000. The question is whether it makes you money or costs you money, and the answer depends almost entirely on two things: who your customers are, and how much VAT you pay on your own purchases.

When voluntary registration pays off

You reclaim input VAT on your allowable business purchases, exactly as a compulsory registrant does. That is worth real money when:

• Most of your customers are VAT-registered businesses. They reclaim the VAT you charge at no net cost to themselves, so your prices do not rise for them. A marketing agency charging a VAT-registered retailer £2,000 a month charges £2,400 after registration, but the retailer reclaims the £400. Your price competitiveness is unchanged, and you now reclaim VAT on your software, equipment and subcontractor costs.
• Your own costs carry a lot of VAT. A new business fitting out a workshop, buying stock, or running paid ads can reclaim 20% of that spending. One £12,000 equipment purchase recovers £2,000 of VAT in a single return.
• You are growing fast and will cross £90,000 soon. Registering early removes the risk of a late-registration penalty and lets you control the effective date. You also avoid repricing mid-contract with existing clients.
• Your suppliers and clients expect it. Some corporate buyers prefer suppliers with VAT numbers, and some industries treat registration as a sign of an established business.

When voluntary registration costs you money

The downside is sharp for businesses that sell to consumers:

• Your prices rise by up to 20% for non-VAT-registered customers. A coffee shop or hair salon cannot pass VAT to customers who cannot reclaim it. Prices go up, you absorb the VAT and lose margin, or both.
• You take on the full admin burden early. Quarterly returns, digital records, invoice rules and Making Tax Digital all start from your chosen registration date. For a business with £30,000 of turnover and little input VAT, that is cost with no return.
• You are tied to regular reporting for as long as you stay registered. You can deregister later, but only once you qualify under the deregistration rules.

The five-question decision checklist

Work through these in order. Your answers will usually point to a clear decision.

1. What share of my customers can reclaim VAT? If most are VAT-registered businesses or overseas buyers, voluntary registration is worth serious thought. If most are consumers or non-registered small businesses, it is probably a cost.
2. How much VAT do I pay on my own costs each quarter? Add up the VAT on rent, stock, materials, software, fuel and subcontractors. If the reclaimable input VAT is larger than the extra VAT your customers will absorb, registration pays for itself.
3. Am I likely to cross £90,000 in the next 12 months? If yes, early registration avoids the deadline scramble and the penalty risk of a late registration.
4. Would my pricing still work with VAT added? Model your top five customer prices with 20% added. If you would lose those customers, do not volunteer.
5. Can I handle the admin? You need MTD-compatible software and quarterly returns from day one. If your bookkeeping is already digital, the marginal effort is small. If it is not, factor in the setup.

Worked example: same business, two customer bases

Take a freelance web designer with £70,000 of turnover and £12,000 a year of VAT-able costs, including £2,000 of reclaimable VAT on software, a new laptop and subcontracted design work.

• Scenario A: 80% of clients are VAT-registered agencies. Registering adds 20% to invoices the agencies reclaim anyway. The designer recovers £2,000 a year of input VAT at almost no pricing cost. Verdict: register.
• Scenario B: 90% of clients are small non-VAT-registered businesses. Those clients pay the full 20% uplift with no way to reclaim it. On £63,000 of consumer-style sales, that is up to £12,600 of price pressure against £2,000 of reclaimed VAT. Verdict: stay unregistered until forced.

The same turnover, the same costs, opposite answers. That is why customer mix, not turnover, is the deciding variable.

One practical note: on voluntary registration you choose your effective date, and HMRC lets you reclaim input VAT on goods you still hold that you bought up to four years before registration, and on services bought up to six months before, provided they relate to your taxable business. So registering now does not mean losing the VAT on recent purchases.

Common VAT Registration Mistakes

The mistakes below come up again and again with growing businesses. Each one is avoidable with a monthly turnover check.

1. Measuring profit instead of turnover. The £90,000 test uses sales before expenses. A loss-making business must still register if its taxable sales cross the line.
2. Ignoring the forward-looking test. A single large contract can make registration compulsory within 30 days, even if your rolling 12-month total is far below £90,000.
3. Leaving zero-rated sales out of the test. Exports and zero-rated domestic sales count toward £90,000. Exporters are caught by this more than any other group.
4. Registering late and hoping HMRC will not notice. You owe the VAT from the effective date regardless, and as of October 2026 HMRC charges a penalty of 5% to 15% of the VAT due depending on how late you register, plus interest.
5. Charging VAT before your effective date. You must charge VAT from the effective date of registration, not from when your VAT number arrives. Issue proper VAT invoices once the number is issued, showing it on each invoice.
6. Forgetting the deregistration threshold. If turnover falls and is expected to stay below £88,000 over the next 12 months, you can ask HMRC to cancel your registration. Staying registered when you no longer need to means paying for admin you do not need.

Frequently Asked Questions

Is the £90,000 VAT threshold based on turnover or profit?

Turnover. HMRC measures your taxable sales before any costs or expenses are deducted. A business can be loss-making and still be legally required to register for VAT.

What counts as taxable turnover for the £90,000 test?

All UK sales that are subject to VAT, including zero-rated sales (0%) and reduced-rated sales (5%), measured excluding VAT. Exempt supplies, supplies outside the scope of UK VAT, and sales of capital assets outside your normal trade do not count.

Do I have to register the moment my turnover crosses £90,000?

The obligation is measured at month-end. At the end of any calendar month, if your taxable turnover for the previous 12 months exceeds £90,000, you must notify HMRC within 30 days. Registration takes effect from the first day of the second month after the month you crossed.

Can I register for VAT voluntarily below £90,000?

Yes, at any turnover level. Voluntary registration makes financial sense when most customers are VAT-registered businesses and you have significant VAT-able costs to reclaim. It usually costs money when most customers are consumers who cannot reclaim the VAT you charge.

What happens if I register late?

You owe VAT from the date you should have registered, not the date you actually register. You cannot add VAT to old invoices, so the shortfall comes out of your margin. As of October 2026, HMRC can also charge a penalty of 5% to 15% of the VAT due depending on how late the registration is, plus interest.

Can I reclaim VAT on purchases I made before registering?

Yes, within limits. You can reclaim VAT on goods bought up to four years before your registration date if you still hold them, and on services bought up to six months before, provided they relate to your current taxable business.

When can I deregister for VAT?

You can ask HMRC to cancel your registration if your taxable turnover falls below the deregistration threshold of £88,000 and is expected to stay below it for the next 12 months. You must also deregister if you stop trading or stop making taxable supplies.

Do zero-rated sales really count toward the threshold?

Yes. This catches many businesses out. Zero-rated supplies are taxable supplies at a 0% rate, so they count. Exempt supplies, such as insurance, finance and education, do not count.

Does the £90,000 threshold apply to non-UK businesses?

Generally no. Businesses based outside the UK that make taxable sales in the UK usually must register from their first sale, with no £90,000 allowance. If you are based in Northern Ireland and buy goods from EU suppliers, separate acquisition rules can apply.

How long does VAT registration take?

Applying online through a Government Gateway account is the normal route. HMRC usually confirms registration and issues a VAT number within a few weeks, though it can take longer at busy periods. You must charge VAT from your effective date even if the number has not arrived yet.

What is the difference between the £90,000 and £88,000 thresholds?

£90,000 is the registration threshold: cross it and you must register. £88,000 is the deregistration threshold: fall below it and you may ask to cancel your registration. The £2,000 gap stops businesses bouncing in and out of registration when turnover hovers near the line.

Conclusion

The VAT registration threshold is simple in outline and exacting in detail. The £90,000 figure is easy to remember, but the obligation lives in the mechanics: the rolling 12-month test you check at every month-end, the forward-looking test that catches sudden contracts, and the 30-day deadline that turns a crossed threshold into a registered business.

For most growing businesses, three habits cover the risk. Track rolling taxable turnover monthly and set an internal alert at around £75,000 so the crossing never surprises you. Check the forward-looking test whenever you sign a large contract. And if you are approaching the line, decide deliberately whether voluntary registration ahead of time would cost less than a late registration behind it.

VAT does not stop being relevant after registration. The VAT you collect belongs to HMRC from the moment you charge it, and it sits in your bank account until each quarterly payment date. Planning for those outflows is part of keeping a business solvent, which is why VAT sits naturally inside your wider tax planning. Review the position alongside our tax planning strategies for small business owners each year, confirm the thresholds on gov.uk after the Autumn Budget, and the registration that once looked like a burden becomes routine administration.

This article is general information about UK VAT as of October 2026, not financial or tax advice. Thresholds, rates and penalties can change, so verify current figures on gov.uk or with HMRC, and consider speaking to a qualified accountant before registering or changing your pricing.