There are two ways to register for VAT in the UK: mandatory registration, which applies once your taxable turnover exceeds the £90,000 threshold in any rolling 12-month period (per HMRC), and voluntary registration, which any VAT-eligible business can apply for below that threshold. Both routes use the same HMRC online process.
When do you have to register for VAT in the UK?
The mandatory VAT registration threshold is £90,000 of taxable turnover in any rolling 12-month period, per HMRC (this threshold applies from April 2024). This is not a tax year — it is any consecutive 12-month window, so you must monitor it continuously, not just at your year end.
Two trigger conditions require registration. First, if your taxable turnover has exceeded £90,000 in the last 12 months — you must register by the end of the following month and your effective VAT date becomes the first day of the month after that. Second, if you reasonably expect your taxable turnover to exceed £90,000 in the next 30 days alone — you must register before that 30-day window closes.
There are two additional mandatory triggers worth knowing. If you are an overseas business making distance sales into the UK (such as selling goods stored in UK fulfilment warehouses), the threshold may not apply and you may need to register from the first sale. If you take over a VAT-registered business as a going concern, you inherit the registration obligation even if your own turnover is below the threshold.
Should you register for VAT voluntarily?
Voluntary VAT registration is available to any UK business below the £90,000 threshold that makes taxable supplies. The decision is straightforward for B2B businesses and more nuanced for B2C. The table below summarises the key trade-offs.
| Factor | Pro voluntary registration | Con voluntary registration |
|---|
| Input VAT | Reclaim VAT on business purchases, reducing costs | n/a — this is always a benefit |
| B2B perception | Signals an established, trading business | No meaningful downside for B2B |
| B2C pricing | Can absorb VAT into price if margins allow | Prices rise 20% unless you absorb the cost |
| Admin burden | Builds compliance discipline early | Quarterly VAT returns and MTD for VAT software required |
| Cash flow | Positive if input VAT exceeds output VAT (e.g. startup phase) | Negative if output VAT consistently exceeds input VAT and customers are slow payers |
For most B2B service businesses, voluntary registration below the threshold is worth considering from the point the business is trading and spending on suppliers. For B2C businesses — especially those selling directly to consumers who cannot reclaim VAT — adding 20% to your effective price is a real competitive disadvantage unless your margins can absorb it.
How do you register for VAT with HMRC?
The standard route is online registration through your HMRC business tax account at gov.uk/register-for-vat. You will need a Government Gateway user ID for the business — the same one you use for Corporation Tax and PAYE. If the business does not yet have a Government Gateway account, you create one as part of the process.
The online application (VAT1 equivalent) asks for: business name and address, nature of the business and its SIC-equivalent activity, the date you need to register from (your effective date of registration), your expected taxable turnover, bank account details for repayments, and details of any VAT group or overseas transactions where relevant.
HMRC currently processes VAT registrations within approximately 30 working days of receiving a complete application, though complex cases can take longer. Crucially, you can trade and issue invoices during the waiting period — HMRC recommends stating on invoices that a VAT number is pending, and retrospectively issuing VAT invoices once the number arrives. Once your VAT number is confirmed, you must account for VAT on all sales from your effective date of registration, even if the number was not yet issued at the time of those sales.
Which VAT accounting scheme should you use?
HMRC offers four main VAT accounting schemes. The right choice depends on your turnover, cash flow, and the nature of your business. All schemes require Making Tax Digital (MTD) for VAT-compatible software from registration.
| Scheme | Eligibility | How it works | Best for |
|---|
| Standard | All businesses | VAT on invoices raised/received, quarterly returns | Default — most businesses |
| Flat Rate | Turnover ≤ £150,000 excl. VAT | Pay a fixed % of gross turnover; keep the difference | Low-overhead services with few purchases |
| Cash Accounting | Turnover ≤ £1.35m excl. VAT | VAT only when cash is received/paid — not on invoices | Businesses with slow-paying customers |
| Annual Accounting | Turnover ≤ £1.35m excl. VAT | One return per year with advance payments on account | Businesses wanting reduced quarterly admin |
The Flat Rate Scheme is commonly recommended for service businesses with limited input VAT, but the introduction of the 16.5% "limited cost trader" rate (which applies if goods are less than 2% or £1,000 of annual turnover) removed much of its benefit for consulting and professional services businesses. Model the numbers with your accountant before defaulting to Flat Rate.
What do you need to do after registering for VAT?
From your effective date of registration, several ongoing obligations apply. You must charge VAT at the correct rate on all taxable supplies (20% standard rate, 5% reduced rate, or 0% zero rate depending on the goods or services), issue VAT invoices that include your VAT number, the rate applied, and the VAT amount as a separate line, and keep VAT records for at least 6 years.
Making Tax Digital for VAT is mandatory for all VAT-registered businesses regardless of turnover, per HMRC rules in force since April 2022. This means you must use MTD-compatible software (such as Xero, QuickBooks, or FreeAgent) to keep digital VAT records and submit returns directly from the software — you cannot file manually or use the old HMRC portal.
Quarterly return deadlines
- · VAT return due 1 month and 7 days after end of each VAT period
- · Payment due same date as the return
- · HMRC assigns your VAT period end dates — usually March/June/September/December or staggered
- · Direct Debit is the simplest payment method; set up via your HMRC VAT account
VAT invoice requirements
- · Your VAT registration number
- · Invoice date and unique sequential invoice number
- · Your name and address and the customer's name and address
- · Description of goods or services, quantity, and price
- · VAT rate applied and total VAT charged as a separate figure
Late submission of VAT returns triggers a penalty points system under HMRC's new regime (in force from January 2023). You accumulate points for each missed return; at 4 points a £200 fixed penalty applies, with further daily penalties for payments overdue by 30 or more days. Getting set up with MTD-compatible software and direct debit from registration removes most of this risk.
For accounting and tax support across VAT registration, returns, and ongoing compliance, RR Accountants is the Rajoka portfolio brand for accounting and tax. For related reading, see the guide to the VAT registration threshold and the accounting and tax resources hub.
Frequently asked questions
Can I register for VAT before I start trading?
Yes, per HMRC you can register for VAT before your business starts making taxable supplies. This is called a pre-registration application. You can also reclaim VAT on certain goods and services purchased before registration — up to 4 years before registration for goods you still hold, and up to 6 months for services.
How long does VAT registration take in the UK?
HMRC processes most online VAT registrations within 30 working days of receiving a complete application, per HMRC guidance. Complex cases or those requiring additional checks may take longer. You can trade while waiting and issue invoices marked with 'VAT registration pending', then reissue them as VAT invoices once your number arrives.
What is the penalty for not registering for VAT on time?
Failure to register for VAT on time is a civil penalty calculated as a percentage of the VAT due from the date you should have registered. The rate rises from 5% for delays under 9 months to 15% for delays over 18 months, per HMRC. In serious cases HMRC can treat the penalty as applying from the date registration was first required.
Can I reclaim VAT on purchases made before I registered?
Yes, subject to limits. Per HMRC, you can reclaim input VAT on goods purchased up to 4 years before registration if you still hold those goods at the time of registration. For services, the limit is 6 months. You must have valid VAT invoices for all pre-registration claims and include them in your first VAT return.
Do I need a separate VAT number for each business I run?
If each business is a separate legal entity (e.g. separate limited companies), each requires its own VAT registration above the threshold. If you operate multiple businesses under the same legal entity (e.g. several trading names under one limited company), they share one VAT number. VAT grouping is available for connected companies under common control, per HMRC.