VAT — Value Added Tax — is a tax collected by businesses on behalf of HMRC on eligible sales. Once you pass the registration threshold, you’re legally required to add VAT to your invoices, keep digital VAT records, and file returns through Making Tax Digital (MTD) software. Get the timing wrong, and you can find yourself liable for VAT on sales you never actually collected from customers.

Knowing how to register for VAT correctly — and when — protects you from that exposure. It also opens the door to reclaiming VAT on your business costs, which for some businesses represents a significant saving.

This guide covers the compulsory threshold, voluntary registration, the step-by-step online process, the VAT scheme options available at the point of registration, and the pitfalls that catch businesses out. Whether you’re approaching the threshold for the first time or registering a newly formed limited company, the information here will give you a clear picture of what’s involved.

The current VAT registration threshold is £90,000 of taxable turnover in any rolling 12-month period. That figure has been in place since April 2024, when it was raised from £85,000. HMRC’s internal guidance on the basic principles of registration was also updated in April 2026 to reflect changes around capital asset disposals and to modernise references to its own digital systems — so the rules are as current as they can be.

What counts as taxable turnover?

Taxable turnover means all sales of goods or services that are subject to VAT at any rate — standard (20%), reduced (5%), or zero (0%). Zero-rated sales count towards the threshold even though no VAT is actually charged. Sales that are exempt from VAT (for example, some financial services, insurance, and certain healthcare services) do not count. If you’re unsure whether your income is taxable, zero-rated, or exempt, that distinction is worth clarifying early.

The rolling 12-month window

The threshold applies to any 12-month period — not just the tax year or your financial year. That means you need to be checking your cumulative turnover on a rolling basis, month by month. A building contractor who earns £60,000 in the first half of the year and then wins a large contract in October could breach £90,000 before the calendar year ends. The trigger is the moment the rolling 12-month total crosses the line, not a year-end total.

What about capital asset disposals?

HMRC updated its registration guidance in April 2026 specifically to clarify how disposals of capital assets are treated in the registration context. In most cases, if you sell a capital asset as part of a one-off transaction rather than as part of your regular business activity, it may need to be considered in your threshold calculation. This is an area where the detail matters — if you’re selling business assets alongside trading income, it’s worth checking whether those proceeds affect your position.

There are two routes into VAT registration: you’re either required to register, or you choose to.

Compulsory registration

You must register if your taxable turnover has exceeded £90,000 in the past 12 months, or if you expect it to exceed £90,000 within the next 30 days alone. The second trigger — the forward-looking test — catches businesses that win a single large contract taking them over the line. You need to register before the 30-day period ends, not after.

The effective date of registration (EDR) is generally the first day of the second month following the month in which you breached the threshold. So if your rolling total crossed £90,000 in August, your EDR would be 1 October. HMRC updated its guidance on effective date of registration in August 2025, creating new reference pages for this area — the rules themselves haven’t changed, but the signposting within HMRC’s systems is cleaner than it was.

Voluntary registration

Any business can register voluntarily, regardless of turnover. This is often worth doing if:

• Your customers are VAT-registered businesses (who can reclaim the VAT you charge, so it costs them nothing).
• You have significant VAT on your costs — equipment, materials, or professional services — that you’d like to reclaim.
• You want to project a more established appearance to larger customers who expect to see a VAT number on invoices.

The downside is the administrative commitment: you’ll need to file MTD-compliant returns, maintain digital records, and manage the cashflow impact of collecting VAT before paying it over. For a sole trader on low margins selling mainly to consumers, voluntary registration can add cost without benefit. For a contractor buying tools and equipment, it often pays for itself quickly.

The registration process is done online via HMRC’s Government Gateway. Before you start, gather the information below — having it to hand keeps the process straightforward.

For sole traders and partnerships

• National Insurance number
• Unique Taxpayer Reference (UTR) if you’re already in Self Assessment
• Business contact details and trading address
• Bank account details for VAT repayments
• Details of your business activity and the main goods or services you supply
• Turnover figures for the past 12 months (or a forecast if registering in advance)

For limited companies

• Company Registration Number (from Companies House)
• Company’s registered address
• Details of all directors
• Bank account details
• Description of business activity
• Turnover figures or forecasts

Government Gateway access

You’ll need an HMRC Government Gateway account. If you already file Self Assessment or Corporation Tax online, you can add VAT to an existing account. If not, you’ll need to create one — have your details ready, as HMRC will send an activation code by post within seven to ten days. Factor this into your timeline if you’re close to a registration deadline.

Once registered, HMRC will send your VAT registration certificate (VAT 4) by post or through your online tax account. This confirms your VAT number, effective date of registration, and the date of your first return.

When you register, you can apply for one of several VAT accounting schemes. The default is the standard method — but for many small businesses, an alternative scheme reduces both the admin burden and sometimes the actual VAT bill.

Standard VAT accounting

You account for VAT on your sales invoices when they’re raised, and reclaim VAT on purchase invoices when received. Returns are filed quarterly. This works well for businesses with consistent cashflow and a good volume of reclaimable costs.

Cash accounting scheme

You account for VAT only when money actually changes hands — not when invoices are raised. This protects cashflow significantly if you deal with slow-paying customers, because you’re not paying VAT to HMRC before you’ve been paid yourself. Available to businesses with taxable turnover up to £1.35 million.

Flat rate scheme

Instead of calculating the difference between output and input VAT, you pay a fixed percentage of your gross (VAT-inclusive) turnover. The percentage varies by industry — from around 4% for food retailers to 14.5% for IT consultants. The advantage is simplicity and, for businesses with low costs, the possibility of keeping a small margin. Available to businesses with taxable turnover up to £150,000. It’s worth modelling the numbers before applying — for businesses with high input VAT (lots of bought-in materials), standard accounting often wins.

Annual accounting scheme

You submit one return per year instead of four, making advance payments on account during the year. Reduces the filing burden but requires careful cashflow forecasting to avoid over or underpaying. Available to businesses with taxable turnover up to £1.35 million.

You select your preferred scheme during the registration process. You can change scheme later, but starting on the right one saves time and avoids unnecessary switching admin.

All VAT-registered businesses are required to comply with Making Tax Digital (MTD) for VAT. This has been the case for businesses above the threshold since 2019, and for all VAT-registered businesses — including those voluntarily registered below it — since April 2022. If you’re registering now, MTD applies from your first return.

What MTD requires

You must keep your VAT records in functional compatible software — essentially, accounting software that can submit returns directly to HMRC’s systems. You cannot enter figures manually into HMRC’s portal. The most common compliant platforms include Xero, QuickBooks, FreeAgent, and Sage. HMRC maintains a full list of approved software on GOV.UK.

What counts as a digital record

You need to keep a digital record of each supply — the time, description, value, and VAT rate. For purchases, you need to record the VAT reclaimed. You don’t need to store invoices digitally (though it’s good practice), but the underlying transaction data must be held in your software.

Digital links

If you use more than one piece of software — for example, a spreadsheet that feeds into accounting software — there must be a digital link between them. Cutting and pasting data between systems manually doesn’t satisfy MTD requirements.

For most small businesses registering today, the straightforward approach is to use an MTD-compatible accounting platform from the start. If you’re already using Xero or similar software, connecting your VAT submissions is usually a matter of a few clicks once you have your VAT registration number. Setting this up correctly at registration avoids having to retrofit MTD compliance later.

The online process takes around 20 to 30 minutes once you have your documents ready. Here’s how it works.

These are the issues that come up regularly in practice — and most of them are preventable.