How to Register for VAT in the UK: The Complete Guide
Who must register, the £90,000 threshold, HMRC online process, VAT certificate, and what to do after registration.
Verified against HMRC guidance and Spring Statement 2026. Last updated May 2026.
If your business turnover is creeping toward £90,000, VAT registration is no longer something you can put off thinking about.
Miss the deadline and HMRC will backdate the penalty to the exact date you should have registered, not the date you actually did. That can mean a nasty surprise bill on top of everything you already owe.
This guide covers everything: who needs to register, how the HMRC online process works, why one in six applications gets rejected, what your VAT certificate actually shows, and what to do the moment it lands.
Quick Answer: How to Register for VAT in the UK
1. Sign in to your HMRC Business Tax Account at gov.uk
2. Select "Add a tax" and choose VAT
3. Complete the online application (business details, turnover, registration reason)
4. Submit your application
5. Receive your VAT number — usually within 30 working days
You must register within 30 days of exceeding the £90,000 threshold or when you expect to exceed it in the next 30 days.
📋What Is VAT Registration and Who Needs to Register?
VAT (Value Added Tax) is a consumption tax charged on most goods and services sold in the UK. Once registered, you collect it from your customers, deduct what you have paid to your own suppliers, and pay the difference to HMRC.
It sounds simple enough. But the rules around when and how to register trip up a lot of small business owners every year.
💷What Counts as Taxable Turnover?
Your taxable turnover is the total value of everything you sell that is not exempt from VAT. This includes standard-rated sales (20%), reduced-rate sales (5%), and — this is the one most people miss — zero-rated sales too.
Zero-rated goods like children's clothing or most food items are still taxable supplies. They count toward your registration threshold even though no VAT is charged on them.
Exempt supplies such as insurance, financial services, and most residential property lettings do not count. If your business only makes exempt supplies, you cannot register for VAT at all.
To understand the difference between zero-rated and exempt supplies in detail, see our what is VAT guide.
📊What Is the VAT Registration Threshold in 2026/2027? 2026
The current VAT registration threshold is £90,000 in any rolling 12-month period.
📰 Spring Statement 2026 — HM Treasury
In March 2026, Exchequer Secretary Dan Tomlinson confirmed in a parliamentary answer that the threshold remains at £90,000 with no planned increase. The Spring Statement 2026 made no changes to either the registration threshold (£90,000) or the deregistration threshold (£88,000).
The key word here is rolling. It is not a tax year figure and it is not April to April. If your turnover from July 2025 to June 2026 exceeds £90,000, you have hit the threshold regardless of what your annual accounts look like.
Real-World Example
Sarah runs a freelance UX design studio in Manchester. Her annual revenue sits around £75,000. She landed two large contracts back-to-back and her rolling 12-month total quietly crossed £91,000. She did not realise she had a problem until her accountant flagged it at year-end. By then she was already two months past the registration deadline.
🔍The Backward Look Test vs the Forward Look Test
HMRC uses two separate tests to determine whether you must register. Most guides only mention one of them.
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The backward look test: At the end of every month, look back at the previous 12 calendar months. If your taxable turnover exceeded £90,000, you must register. You have 30 days from the end of that month to notify HMRC.
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The forward look test: If at any point you have a reasonable belief that your taxable turnover will exceed £90,000 in the next 30 days alone (not over a year — in 30 days), you must register immediately.
A contractor or freelancer with one large client can hit the forward look test after a single contract win, long before the year-end accounts would show any problem. This is exactly why monthly turnover tracking matters.
📰 IMF Working Paper WP/2024/033 — HMRC / IPSOS Survey Data
A survey of over 2,000 UK firms found that 20% of unregistered borderline businesses admitted to having taken some action to stay under the VAT threshold. The researchers identified a clear pattern of turnover slowdown among firms approaching £90,000, described as a "bunching" effect caused by the compliance burden businesses expect on crossing the threshold.
⚖️Exception from Registration
Crossing the threshold does not automatically mean you must register. HMRC allows a business to apply for an exception from registration if the breach is genuinely temporary.
To qualify, you must show HMRC that your taxable turnover will not exceed the deregistration threshold of £88,000 in the 12 months following the breach. A one-off unusually large project or a short seasonal spike can qualify.
How to Apply for an Exception
Contact HMRC by telephone and request form VAT1 and form VAT5EXC. Return both forms with written evidence supporting your forecast turnover. HMRC will confirm whether the exception is granted or register you automatically. If your application is refused, HMRC registers you from the original effective date and any late registration penalties still apply.
🔀Mandatory vs Voluntary VAT Registration
Once taxable turnover hits £90,000, registration is a legal requirement. No exceptions and no grace period beyond the 30-day notification window.
But many small business owners do not realise you can register voluntarily even when turnover is well below the threshold.
✅Reclaim input VAT on business purchases, reducing your actual costs
✅Appear more credible to larger B2B clients — many will only work with VAT-registered suppliers
✅Prepare for growth so you are not scrambling to register mid-contract
📰 British Chambers of Commerce Data — cited in FormMyCompany research 2026
Approximately 65% of B2B buyers in the UK say they prefer working with VAT-registered suppliers. For service businesses operating in B2B markets, voluntary registration can directly affect whether contracts are won or lost.
The downside is extra admin and the fact that your prices will appear 20% higher to non-VAT-registered customers. For B2C businesses, voluntary registration rarely makes sense until you are close to the threshold.
Anti-Avoidance Warning — Disaggregation
HMRC has anti-avoidance rules around disaggregation — artificially splitting one business into multiple entities to keep each one below the threshold. HMRC can treat all the entities as a single taxable person and apply the threshold collectively. This is one of the few areas where HMRC will investigate business structure actively.
🖥️How to Register for VAT Online with HMRC — Step by Step
The quickest route is online via HMRC's Business Tax Account. The paper route using form VAT1 is still available but takes significantly longer and is generally reserved for complex cases such as overseas businesses or group registrations.
What you need before you start:
📄Government Gateway user ID and password
📄Unique Taxpayer Reference (UTR) from your Self Assessment or Corporation Tax correspondence
📄National Insurance number — for sole traders and directors
📄Business address and contact details
📄Business bank account details
📄A clear description of your main business activity
📄Your turnover figures for the past 12 months
📄The date your turnover crossed the threshold
The HMRC online registration walkthrough:
1
Sign in to HMRC Business Tax Account
Go to gov.uk and sign in using your Government Gateway user ID and password.
2
Select "Add a tax to your account"
Choose VAT from the list of available taxes.
3
Answer the eligibility questions
Business type, reason for registering, and approximate turnover.
4
Enter your business details
Contact information, bank account, and confirm the effective date of registration.
5
Review and submit
You will receive an online acknowledgement immediately. Your VAT number will follow by post, usually within 30 working days.
⏱️How Long Does VAT Registration Take?
In most cases HMRC processes online registrations within 30 working days.
AccountingWeb reported that processing times improved significantly after a post-pandemic backlog that saw applications taking over three months. The Chartered Institute of Taxation confirmed that HMRC's VAT registration team had been processing over 90% of applications within the 40-working-day target for six consecutive months.
One important distinction: the date you receive your VAT certificate is not the same as your effective date of registration. HMRC backdates the effective date to when your obligation arose. You are legally required to account for VAT from that earlier date, not the day the certificate arrives.
📅What Is the Effective Date of VAT Registration?
This is the single most misunderstood aspect of VAT registration and getting it wrong is expensive.
Your effective date is the date from which you are legally a VAT-registered business. HMRC sets it as the date your obligation arose — usually the first day of the month after you crossed the threshold under the backward look test.
If you register late, HMRC calculates penalties and outstanding VAT from the effective date, not your application date. That gap can represent months of VAT you should have been collecting but did not.
Late Registration Penalties
Less than 9 months late5% of unpaid VAT
9 to 18 months late10% of unpaid VAT
More than 18 months late15% of unpaid VAT
Minimum penalty£50 (no maximum)
🧾Can I Charge VAT Before I Receive My VAT Number?
Yes — and in fact you must charge VAT from your effective date, even if your certificate has not arrived yet.
The practical solution: issue invoices as normal but add a note stating "VAT registration applied for, VAT number to follow." Once the number arrives, either reissue the invoice or send a supplementary VAT-only invoice to the client.
Most B2B clients will accept this without question. HMRC explicitly allows it.
📜What Does a VAT Certificate Look Like and What Does It Tell You?
Your VAT certificate (officially called a VAT9) arrives by post from HMRC after your registration is approved. It is a single A4 document containing the following key details:
🔢Your VAT registration number in the format GB followed by 9 digits — for example GB 123 4567 89
📅Your effective date of registration — the date from which you must charge and account for VAT
🏢Your business name and trading address as submitted in the application
💼Your main business activity as described in your application
🗓️Your VAT return periods — quarterly by default unless you requested otherwise
Critical Things to Know About Your VAT Certificate
Keep it safe — HMRC does not automatically reissue lost certificates. Your VAT number is permanent, even if you change your business name, move address, or change your accounting method. You must display your number on all VAT invoices, your website, and business stationery.
⚠️Why HMRC Rejects VAT Applications — and How to Avoid It
Most people assume VAT registration is automatic once you submit the form. It is not.
HMRC data shows that in the 2023/24 tax year, 17% of all VAT registration applications were rejected — that is 52,000 out of 314,000 applications. A further 1,000 were withdrawn by the applicants themselves, often because HMRC requested more information and the business gave up on the process.
The three most common rejection reasons:
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1. Inaccurate or inconsistent information — Any mismatch between your application and HMRC or Companies House records triggers a rejection. This includes slightly different versions of your address, a director name spelled differently, or a UTR that does not match your Self Assessment record.
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2. Poor business activity description — The description you provide directly affects which SIC code HMRC assigns. If your description implies exempt activities, the automated system can flag or reject the application. Fix: be specific and describe the taxable part of your business first.
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3. Insufficient evidence of trading — HMRC needs to be satisfied your business is genuinely operational. If you cannot demonstrate active trading through invoices, purchase orders, or supplier agreements, the application may be refused. A personal bank account instead of a business one is a common red flag.
If Your Application Is Rejected
Correct the issue and resubmit (fastest option) · Call HMRC's VAT helpline on 0300 200 3700 to discuss the specific objection · Ask an accountant to escalate via the CIOT/ATT escalation route, which exists specifically for unjustified rejections. Do not ignore a rejection — you still have a legal obligation to register from your effective date.
🏗️VAT Registration for Different Business Types
Sole traders
As a sole trader, you register in your own name. If you run multiple sole-trader activities, HMRC combines all their turnovers when applying the threshold test. There is no separate £90,000 allowance per business activity.
Limited companies
A limited company registers as a separate legal entity. Each company is assessed independently unless HMRC determines they are artificially disaggregated. You will need the company's UTR and Companies House registration number.
Non-UK businesses selling to UK customers
If you are based outside the UK but making taxable supplies to UK customers, you are what HMRC calls a non-established taxable person (NETP). NETPs have no registration threshold — the obligation begins from your very first taxable sale to a UK customer, regardless of how small.
Group VAT registration
If you own or control multiple UK companies, you may be able to register them as a VAT group. Supplies between group members are disregarded for VAT purposes, which simplifies cash flow and reduces admin across the group.
Each group member is jointly and severally liable for the group's VAT obligations, so professional advice is worth taking before setting one up.
✅What Happens After You Register for VAT?
Reclaiming VAT on purchases made before registration
Most new VAT registrants leave money on the table here. You can claim back VAT on eligible purchases made before your registration date.
📦Goods: Reclaimable up to 4 years before your effective date, as long as the goods are still on hand and have not been sold or consumed
🛎️Services: Reclaimable up to 6 months before your effective date
Real-World Example
James runs an e-commerce business selling fitness equipment and registered for VAT in March 2025. In January 2025 he spent £12,000 plus £2,400 VAT on inventory he still holds. He claims that £2,400 on his first VAT return. Most new registrants never realise they are owed it.
Making Tax Digital for VAT — your obligations from day one
From the moment you are VAT-registered, you must comply with Making Tax Digital (MTD) for VAT. This means keeping digital records of all VAT transactions and submitting returns using MTD-compatible software — not manually through the HMRC portal.
Compatible options include Xero, QuickBooks, Sage, and FreeAgent.
📰 OBR Fiscal Forecast — January 2026
VAT receipts for 2023/24 totalled £168 billion. The OBR forecast for 2025/26 projects VAT receipts rising to £180.4 billion, driven partly by stronger enforcement of MTD compliance. From April 2026, MTD for Income Tax also begins for sole traders and landlords earning over £50,000.
Choosing the right VAT accounting scheme
Make this decision at registration, not six months later. Three alternatives to the standard method are worth knowing about:
📊Flat Rate Scheme: Pay a fixed percentage of your gross turnover. Often cheaper for service businesses with low expenses. Available if taxable turnover is under £150,000.
💰Cash Accounting Scheme: Account for VAT only when you actually receive or make payment. Better for businesses with slow-paying clients.
🗓️Annual Accounting Scheme: Submit one return per year with advance payments throughout. Reduces admin but makes early problem-spotting harder.
When and how to cancel your VAT registration
If your taxable turnover drops below £88,000 you can apply to deregister via your Business Tax Account. You are also required to deregister if you stop making taxable supplies entirely.
On deregistration you may need to account for VAT on certain business assets including stock and equipment, as if you had sold them on the deregistration date. This is a frequently missed liability.
❓Frequently Asked Questions
The threshold is £90,000 in any rolling 12-month period. Raised from £85,000 in April 2024 and confirmed unchanged through 2026 by the Spring Statement 2026. Zero-rated sales count toward the threshold. Exempt sales do not.
Most online applications are processed within 30 working days. You can trade before the certificate arrives. Note your pending registration on invoices and add the VAT number once it is issued.
Government Gateway login, UTR, NI number (sole traders and directors), business address, bank account details, a specific description of your business activity, and your turnover figures for the past 12 months.
Only if your taxable turnover exceeds £90,000 in any rolling 12-month period. Below that, registration is voluntary. All sole-trader activities are combined when applying the threshold test.
Yes. Goods up to 4 years before your effective date (if still held) and services up to 6 months before. Claim on your first VAT return.
HMRC assesses a penalty of 5% to 15% of the VAT owed from the effective date, depending on how late the registration is. The effective date is backdated to when your obligation arose, not your application date.
Mandatory registration is a legal requirement above the £90,000 threshold. Voluntary registration is a business choice below it. Useful for reclaiming input VAT and working with B2B clients, but it adds admin and increases prices for non-VAT-registered customers.
You receive a letter or email from HMRC explaining the reason. Correct the issue and resubmit, or call the VAT helpline on 0300 200 3700. Do not delay as any late registration penalty continues to accrue from your effective date.
It is a single A4 document called a VAT9. It shows your VAT number (format: GB + 9 digits), your effective registration date, your business name and address, and your return periods. Keep it safe as HMRC does not automatically reissue lost copies.
✅Final Thoughts
VAT registration is not as complicated as it first looks. But the details matter.
The rolling 12-month threshold, the backward and forward look tests, the effective date of registration, pre-registration input tax claims, the 17% rejection rate, the VAT9 certificate: each of these is a place where businesses routinely lose money or time, purely from not knowing the rules.
The simplest takeaway: track your rolling 12-month turnover every single month, not just at year-end. Set a personal alert at £80,000 so you have time to prepare rather than scramble.
Use our free VAT calculator to check your VAT figures instantly. And if you are already VAT-registered and have never checked whether you can reclaim input tax on pre-registration purchases, check. It is often a meaningful sum and HMRC will not remind you.
All information is correct for 2026/2027 and based on HMRC published guidance and Spring Statement 2026. This article is for general information only and does not constitute professional tax advice. Consult a qualified accountant or contact HMRC directly for advice specific to your situation.