VAT registration is one of those compliance milestones that catches businesses off guard more often than it should. Turnover grows steadily, the threshold creeps closer, and then — sometimes without a clear moment of realisation — your company is legally obliged to be registered and you’re behind the clock. In 2024–25, around 234,000 businesses completed new VAT registrations in the UK, bringing the total to over 2.28 million live registrations. If your company is approaching or has already crossed the £90,000 threshold, understanding how to VAT register a company correctly — and on time — is genuinely important.

This guide covers everything you need to know: when registration becomes compulsory, what voluntary registration involves, the information you need to gather before you start, the online process itself, what happens in the weeks after you apply, and the mistakes that consistently catch businesses out. It applies to limited companies specifically, though much of the process is the same regardless of business structure.

This is general information rather than advice for your specific situation. If your circumstances are complex — mixed VAT supplies, property transactions, international sales — a conversation with an accountant before you register will save headaches later.

The compulsory VAT registration threshold for UK businesses currently stands at £90,000 of taxable turnover. This figure was raised from £85,000 in April 2024 — the first upward movement in nearly a decade. If your company’s taxable turnover exceeds this amount over any rolling 12-month period, you are legally required to register.

The rolling 12-month rule

This is where a lot of companies trip up. The test is not your financial year, your accounting year, or the April-to-April tax year. It is a continuously rolling 12-month window. At the end of every month, you look back over the previous 12 months. If the total taxable turnover for that period has gone above £90,000, the threshold has been breached.

In practice, this means a company with fairly flat revenue can breach the threshold in a single calendar month if a handful of large invoices land together — even if the following months are quiet. You cannot retrospectively smooth it out.

What counts as taxable turnover?

Taxable turnover includes all supplies that are subject to VAT — whether at the standard 20% rate, the reduced 5% rate, or the zero (0%) rate. Zero-rated supplies are still taxable supplies for registration purposes; they just carry a nil VAT charge. Exempt supplies — such as certain financial services, insurance, and most residential property transactions — do not count towards the threshold.

If your company makes a mix of taxable and exempt supplies, you need to track the taxable portion separately. Getting this wrong in either direction creates problems: overestimating means registering earlier than required, underestimating means registering late.

What if you expect to exceed the threshold?

There is also a forward-looking test. If at any point you have reasonable grounds to believe your taxable turnover will exceed £90,000 in the next 30 days alone — perhaps because you’ve just signed a significant contract — you must register immediately, regardless of your historic figures. This catches businesses that expand quickly through a single large deal.

Gathering everything before you start the online application makes the process significantly smoother. HMRC’s VAT registration service times out, and incomplete applications create delays. Here is what you will typically need for a UK limited company.

Company details

• Your company’s full legal name and any trading name if different
• Companies House registration number
• Registered office address and principal place of business address
• Date your company was incorporated

Director and authorised signatory details

• Full name, date of birth, and National Insurance number for each director
• The name of whoever is authorising the registration (usually a director)

Financial information

• The date you exceeded — or expect to exceed — the £90,000 threshold. This becomes your effective date of registration (EDR), which is the date your VAT liability begins
• Your estimated taxable turnover for the next 12 months
• Your main business activity described in plain terms
• Details of your main suppliers and customers if HMRC requests them (more likely for higher-risk sectors)

Bank account details

HMRC will need your company’s business bank account details for VAT repayments. If your company is regularly in a repayment position — for example, if you sell zero-rated goods or invest heavily in equipment — getting this right from the start avoids unnecessary delays to any refunds due.

Government Gateway credentials

You register online via HMRC’s Government Gateway. If your company does not already have a Government Gateway account for Corporation Tax or PAYE, you will need to create one. Have the company’s UTR (Unique Taxpayer Reference) to hand if you have one, as this links the accounts.

VAT registration for UK companies is handled entirely online through the Government Gateway. HMRC no longer accepts paper VAT1 forms for most standard registrations. The process typically takes 20–40 minutes once you have all the information above to hand.

The key thing to understand before you start is the effective date of registration (EDR). This is the date from which you are treated as a VAT-registered business — the date from which you must account for output VAT on your sales. Critically, this is not the date you receive your VAT registration number (VRN). HMRC can take several weeks to process an application, but your liability starts from the EDR regardless. A First Tier Tribunal case confirmed this position: a business that waited two months for HMRC to process its registration was still held liable for output VAT on every sale made from its EDR onwards.

What happens after you submit

Once your application is submitted, HMRC will review it and — usually within a few weeks — issue your VAT registration certificate showing your VRN, your EDR, and your first VAT return period. You cannot issue VAT invoices showing a VAT number until you actually have the VRN. However, HMRC’s own guidance (Notice 700/1) sets out a pragmatic approach: you can go back to customers after you receive your VRN, issue supplementary VAT invoices, and collect the VAT you were unable to charge at the time. Most commercial customers will accommodate this if you explain the situation promptly.

Making Tax Digital for VAT

All VAT-registered businesses are now required to comply with Making Tax Digital (MTD) for VAT. This means keeping digital records and submitting VAT returns using MTD-compatible software rather than logging figures directly into HMRC’s portal. Cloud accounting platforms such as Xero handle this automatically. If you are not already using compatible software when you register, you will need to set it up before your first return is due.

Standard quarterly VAT returns are the default, but several alternative schemes are available that suit different business models. It is worth understanding your options before you register, since switching schemes later is straightforward but can create a short-term admin headache if your first return is already filed on the wrong basis.

Standard VAT accounting

You account for VAT on sales when invoices are issued (the invoice date), regardless of when the customer pays. You reclaim VAT on purchases when you receive the supplier’s invoice. This is the default and suits most businesses with prompt payment cycles.

Cash accounting scheme

VAT is accounted for when money actually changes hands rather than when invoices are raised. If your customers take 60 or 90 days to pay, this can provide a meaningful cash flow advantage — you’re not paying VAT over to HMRC before you’ve collected it. Available to businesses with taxable turnover up to £1.35 million.

Flat rate scheme

Instead of calculating VAT on every individual transaction, you apply a fixed percentage to your gross (VAT-inclusive) turnover. The percentage varies by industry sector and is set by HMRC. The scheme reduces admin and can produce a small financial benefit for businesses with low input VAT costs — though the April 2017 introduction of a 16.5% flat rate for ‘limited cost traders’ reduced its attractiveness for many service businesses. Worth modelling for your specific sector before assuming it’s beneficial.

Annual accounting scheme

You make nine interim payments based on the previous year’s VAT bill and submit one annual return instead of four quarterly ones. Suits businesses that want to reduce return-filing frequency, though the single year-end reconciliation can produce a larger-than-expected balancing payment if turnover has grown significantly during the year.

None of these schemes change the fundamental rules around when you must register — they only affect how you account for VAT once you are registered.

Nothing stops your company from registering for VAT before reaching £90,000 in taxable turnover. Whether it makes sense depends on your customer base, your supply chain, and your growth trajectory.

The case for registering early

The main financial argument for voluntary registration is input VAT recovery. Once you are registered, you can reclaim the VAT element of most business purchases — equipment, software, professional fees, premises costs, and so on. If your company spends heavily on VATable supplies, the input tax recovery can be significant, even before turnover reaches the compulsory threshold.

There is also a credibility argument. Many larger businesses and public sector clients prefer — or in some cases require — suppliers to be VAT-registered. It signals a degree of commercial scale and reduces friction in their own purchase ledger. For a consultant or contractor working with corporate clients, being VAT-registered from day one is rarely a disadvantage.

The case against registering early

If your customers are predominantly private individuals or small businesses that cannot reclaim VAT, registering early means adding 20% to your invoices — which either comes out of your margin or makes you more expensive relative to non-registered competitors. For a B2C business with turnover well below £90,000, voluntary registration can be a genuine commercial headwind.

The right answer depends on your specific mix of customers and costs. It is worth running through the numbers before you decide — the saving or cost can be material over a full year.

One important caution

Some business owners consider restructuring — for example, splitting a single business across multiple entities — specifically to keep each entity below the VAT threshold. HMRC has specific disaggregation rules designed to prevent exactly this. If HMRC determines that two or more businesses are artificially separated to avoid VAT registration, it can treat them as a single entity, register them together, and apply backdated VAT plus penalties. The test is whether the businesses are genuinely separate and independent in substance, not just on paper.

Receiving your VAT registration certificate is not the end of the process — it is the beginning of your ongoing compliance obligations. Here is what needs to happen once your VRN arrives.

Update your invoices immediately

From your EDR, all invoices to VAT-registered customers should show your VAT number, the VAT rate applied, and the VAT amount as a separate line. If you issued invoices between your EDR and receiving your VRN, you should issue supplementary VAT-only invoices to those customers as soon as possible so they can reclaim the VAT. Most will appreciate the prompt communication.

Set up your VAT account in your accounting software

Your cloud accounting platform needs to be configured for the correct VAT scheme and return period. If you are using Xero, this means linking your account to HMRC via MTD, setting the right VAT basis (invoice or cash), and checking that your chart of accounts has the correct VAT codes assigned to each income and expense category. Getting this right at setup saves considerable time at return-filing.

Know your return deadlines

For standard quarterly filers, your VAT return and any payment due must reach HMRC within one calendar month and seven days of the end of each quarter. Missing deadlines — even by a day — counts against your compliance record and can trigger a surcharge or penalty under the newer points-based penalty system that HMRC has introduced. Setting a calendar reminder a week before each deadline is a simple precaution.

Keep valid VAT invoices for everything you reclaim

To reclaim input VAT on a purchase, you must hold a valid VAT invoice from the supplier. A bank statement showing the amount paid, or an order confirmation email, is not sufficient. HMRC is clear on this point, and failing it during a VAT inspection means losing the reclaim. Chase suppliers for proper invoices at the time of purchase, not months later when records are harder to recover.

The following steps take you through the online VAT registration process for a UK limited company from start to finish.

These are the errors that consistently cause problems in practice — some costly, some simply avoidable with a little planning.