Knowing how to register for a VAT number is one of the first compliance steps many UK businesses face. VAT — Value Added Tax — is a consumption tax collected by businesses on behalf of HMRC, and once you’re registered you become responsible for charging it on taxable sales, reclaiming it on qualifying business costs, and filing regular VAT returns.

As of May 2026, the VAT registration threshold sits at £90,000 of taxable turnover in any rolling 12-month period. That figure catches a significant proportion of growing small businesses, and HMRC’s own data shows there are over 2.7 million VAT and/or PAYE registered businesses in the UK — so you won’t be navigating this alone.

This guide explains the full VAT registration process: who needs to register, when the obligation kicks in, what the online application involves, which VAT scheme to consider, and the mistakes that slow things down or cause problems later. Whether you’re a sole trader, a limited company, or a landlord with taxable supplies, the same core process applies.

VAT registration is compulsory once your taxable turnover exceeds the current threshold of £90,000 in any rolling 12-month period. That’s not a tax year — it’s any continuous 12-month window. So if your turnover from June 2025 to May 2026 crosses £90,000, you’re over the threshold even if your turnover in the 2025–26 tax year alone did not.

Mandatory registration triggers

• Retrospective basis: You exceeded £90,000 in the past 12 months. You must register within 30 days of the end of the month in which you crossed the threshold.
• Prospective basis: You have reasonable grounds to expect your turnover will exceed £90,000 in the next 30 days alone. You must register before that 30-day period ends.
• Taking over a VAT-registered business: If you acquire a business as a going concern and its combined turnover with yours exceeds the threshold, registration may be required immediately.

Voluntary registration

You can also register voluntarily if your taxable turnover is below £90,000 — or even nil. This is worth considering if you sell primarily to VAT-registered businesses (who can reclaim the VAT you charge) or if you have significant VAT costs you’d want to recover. The trade-off is the administrative burden and, for businesses selling to consumers, the visible price increase.

Businesses outside the standard rules

Some situations fall outside the standard threshold rules. If you only make exempt supplies — such as certain financial services or insurance — you cannot register for VAT. If you make a mix of taxable and exempt supplies, only the taxable element counts towards the threshold. Businesses based outside the UK but making taxable supplies in the UK may also need to register, regardless of their turnover level.

The VAT registration process is carried out online through your HMRC business tax account. Before you start the application, gather the following — incomplete applications are one of the most common reasons for delays.

Business details

• Legal name and trading name (if different)
• Business address and contact details
• Business structure — sole trader, partnership, limited company, LLP, or other
• National Insurance number (for sole traders) or company registration number (for limited companies)
• Unique Taxpayer Reference (UTR) if you are already registered for Self Assessment or Corporation Tax

Turnover and trading information

• The date your turnover crossed — or is expected to cross — the registration threshold
• A description of what your business sells and the nature of your taxable supplies
• Your expected taxable turnover for the next 12 months
• Details of any VAT-registered businesses you are taking over, if applicable

Bank account details

You’ll need your business bank account details. HMRC uses these for VAT repayments where your input tax exceeds output tax in a return period. If you don’t have a business account yet, this is a practical reason to set one up before registering.

Agents and authorisation

If an accountant is handling the registration on your behalf, they will need to be authorised as your agent in the HMRC system before submitting. If you’re using JD Accountancy for this, Joey will handle the authorisation request as part of the onboarding process — you’ll just need to confirm the agent code that HMRC sends you.

HMRC’s VAT registration service is accessed through the Government Gateway. You’ll need a Government Gateway user ID and password — if you don’t already have one, you can create one during the process. The registration itself is done at gov.uk/register-for-vat.

Logging in and starting the application

Sign in to your business tax account using your Government Gateway credentials. From the account home screen, select ‘Register for VAT’ under the VAT section. You’ll be taken through a series of questions about your business type and registration reason before the full application opens.

Completing the application form

The online form walks through your business details, the reason for registration (mandatory or voluntary), and the effective date of registration. The effective date matters — it determines when you first become liable to charge VAT. If you’re registering because you crossed the threshold, the effective date will typically be the first day of the second month after the month you crossed it.

Choosing your VAT scheme during registration

At this point you may be asked whether you want to apply for the Flat Rate Scheme or the Cash Accounting Scheme. It’s worth thinking about this in advance rather than defaulting. The standard scheme suits many businesses, but the Flat Rate Scheme can reduce admin for service-based sole traders with low input costs, while Cash Accounting aligns VAT payments with actual cash flow rather than invoice dates.

Submitting and receiving your VAT number

Once submitted, HMRC will send a VAT registration certificate to your online account. This includes your VAT registration number (a 9-digit number in the format GB 123 4567 89), your effective date of registration, and your first VAT return period. HMRC aims to process applications within 40 working days, though many come through considerably faster — sometimes within a few days for straightforward applications.

Below the £90,000 threshold, registering for VAT is entirely optional. Whether it makes sense depends on who your customers are and the shape of your cost base.

The case for registering voluntarily

• Reclaim VAT on costs: If you have significant business purchases — equipment, materials, professional fees — that carry VAT, registration allows you to recover that input tax. A builder buying £20,000 of materials each year is paying £4,000 in VAT on those purchases. Recovering that is a meaningful saving.
• Credibility with business customers: Many larger businesses and procurement teams automatically expect their suppliers to be VAT registered. Having a VAT number can signal that you are a credible, established business.
• Preparation for growth: If you’re approaching the threshold, voluntary registration now means you won’t face the administrative scramble of a rushed mandatory registration later.

The case against registering voluntarily

• Higher prices for consumers: If most of your customers are private individuals (not VAT-registered businesses), adding 20% VAT to your prices either cuts your margin or makes you less competitive. A freelance photographer whose clients are mostly private individuals would feel this directly.
• Quarterly filing obligation: Once registered, you must file VAT returns — typically quarterly — even in periods when your turnover is low. That’s an ongoing compliance commitment.
• MTD for VAT compliance: All VAT-registered businesses must use Making Tax Digital (MTD)-compatible software to keep digital records and submit returns. This is manageable with the right setup, but it’s an additional requirement to be aware of.

There’s no single right answer here. It comes down to your customer mix, your cost structure, and how close you are to the threshold.

Once registered, you don’t have to use the standard VAT accounting method. HMRC offers several schemes designed to reduce admin or improve cash flow for smaller businesses. The main options are:

Standard VAT accounting

You charge VAT on sales (output tax) and reclaim VAT on purchases (input tax). The difference is paid to HMRC — or refunded if your input tax exceeds your output tax. Returns are usually quarterly. This is the default and suits most businesses with significant purchases that carry VAT.

Flat Rate Scheme (FRS)

Instead of tracking every input and output individually, you pay a fixed percentage of your gross (VAT-inclusive) turnover to HMRC. The percentage varies by business sector — for example, IT consultants currently pay 14.5% under the scheme. It simplifies record-keeping and can produce a small surplus compared to standard accounting, particularly for service businesses with low VAT-able costs. Available to businesses with expected taxable turnover of £150,000 or less (excluding VAT).

Cash Accounting Scheme

You account for VAT based on when payment is actually received or made, rather than when invoices are raised. This helps businesses with long payment terms avoid paying VAT to HMRC before the customer has actually paid. Available to businesses with taxable turnover up to £1.35 million.

Annual Accounting Scheme

You file a single VAT return per year rather than quarterly, making advance payments throughout the year. This can reduce admin for very small businesses, though it removes the early warning that quarterly filing provides if something has gone wrong with your VAT records. Available to businesses with taxable turnover up to £1.35 million.

Choosing the right scheme at registration — rather than switching later — saves time and avoids any administrative complications from changing mid-year.

Getting your VAT registration certificate is not the end of the process — it’s the start of your ongoing VAT compliance obligations.

Update your invoices immediately

From your effective date of registration, your sales invoices must show your VAT number, your business name and address, the invoice date, a description of the goods or services, the net amount, the VAT rate applied, and the VAT amount charged. Non-compliant invoices can cause problems when your customers try to reclaim the VAT you’ve charged them.

Set up MTD-compatible software

All VAT-registered businesses are required to use Making Tax Digital for VAT. This means keeping digital VAT records and filing returns through MTD-compatible software — you cannot file manually through your HMRC account. Xero, QuickBooks, and Sage all support MTD for VAT. Joey sets up Xero for all JD Accountancy clients as standard.

Know your filing deadlines

VAT returns are typically due one month and seven days after the end of each return period. So if your return period ends 31 March, your return and payment are due by 7 May. Missing the deadline triggers a late-submission point under HMRC’s current penalty regime — accumulate enough points and you’ll face a financial penalty.

Consider back-claiming pre-registration VAT

Many newly registered businesses don’t realise they can reclaim VAT on certain costs incurred before registration. The rules allow you to reclaim VAT on goods purchased up to four years before registration (if the goods are still on hand) and services purchased up to six months before registration. This is worth reviewing carefully when you first set up your VAT account.

Here is the VAT registration process from start to finish, in the order you will actually complete it.

These are the errors that cause the most problems in practice — either delaying registration or creating compliance issues once you’re registered.