Once your business grows past a certain size, registering for VAT stops being optional. The good news is that you no longer need to post paper forms to HMRC and wait weeks in the dark — you can register for VAT online in one sitting, and the whole process is designed around your Government Gateway account.
Whether you must register because you have crossed the £90,000 threshold or you are choosing to register voluntarily, the online route is the fastest and simplest way to get your VAT number. Here is exactly how it works, what HMRC asks for, and what to do while you wait.
How do I register for VAT online in the UK?
To register for VAT online, sign in to your HMRC Government Gateway account, go to the VAT registration service at gov.uk/register-for-vat, and complete the online application with your business details, turnover figures, bank details and the date you crossed the £90,000 threshold. Submit the form and wait for HMRC to issue your VAT number, usually within 30 working days.
Do I actually need to register for VAT?
Before you start the application, make sure registration is the right move. You must register if your VAT-taxable turnover went over £90,000 in the last 12 months, or if you expect it to go over £90,000 in the next 30 days alone. Once either trigger is hit, you have 30 days to tell HMRC — miss the deadline and HMRC can charge you a penalty based on the VAT you should have collected.
You can also register voluntarily below the threshold. That often makes sense if your customers are mostly VAT-registered businesses (they can reclaim the VAT you charge them) or if you spend a lot on VAT-able supplies and want to reclaim the VAT yourself. It usually does not make sense if you sell mainly to the public, because your prices effectively rise by 20%.
If you are still unsure where you stand on the threshold, the dates and the rates, our complete guide to VAT registration in the UK explains the £90,000 rule, the three VAT rates and the schemes you can choose from.
What you need before you start
HMRC rejects a surprising number of online applications simply because something does not match their records. Gather everything first and check the details carefully:
- Government Gateway user ID and password — if you do not have one, create it at GOV.UK before you begin; it takes a few minutes and you will need it for all HMRC online services.
- Business details — legal business name, trading name if different, business address, contact details, and what the business does.
- Company number — if you are a limited company, plus your Unique Taxpayer Reference (UTR).
- National Insurance number — required for sole traders and partners.
- Bank account details — the account HMRC will use for VAT refunds; make sure the account name matches the business.
- Turnover figures — your taxable turnover for the last 12 months and an estimate for the next 12 months.
- The registration date — the date you crossed the threshold (your “effective date of registration”), or the date you want a voluntary registration to start.
- Details of associated businesses — if you are linked to any other VAT-registered businesses.
The golden rule: every name, number and address must match exactly what HMRC and Companies House already hold for you. A mismatch on a director’s name or a UTR is the most common reason applications get held up.
The 7 steps to register for VAT online
Step 1: Sign in to Government Gateway. Go to the VAT registration service on GOV.UK and sign in with your Government Gateway ID. Keep your phone handy — HMRC may ask for a two-step verification code.
Step 2: Choose your registration reason. Tell HMRC why you are registering: you crossed the threshold, you expect to cross it in the next 30 days, you are registering voluntarily, or you are taking over a business as a going concern. This choice affects your effective date, so pick carefully.
Step 3: Enter your business details. Fill in the business name, address, contact details, what the business does and when it started trading. For a limited company, enter the company number and UTR exactly as they appear on your Companies House and HMRC records.
Step 4: Enter your turnover figures. Give your taxable turnover for the past 12 months and your expected turnover for the next 12 months. This is also where you confirm the date you crossed the £90,000 threshold, if that is what triggered registration.
Step 5: Add your bank details. Enter the sort code and account number HMRC should use for any VAT refunds. Double-check them — refunds to the wrong account cause real headaches.
Step 6: Review and submit. Read through the whole application before you hit submit. HMRC shows a summary screen; check every figure and every name. Once submitted, you get a submission reference — save it somewhere safe.
Step 7: Wait for your VAT number. HMRC says most applications are processed within 30 working days, though busy periods can take longer. Do not charge VAT on your invoices until your VAT number arrives — but you are still liable for VAT on sales from your effective date of registration, so keep clean records of everything you sell in the meantime.
Here is the whole process at a glance:
| Step | What you do | Time it takes |
|---|---|---|
| 1 | Sign in to Government Gateway | 5 minutes |
| 2 | Choose your registration reason | 2 minutes |
| 3 | Enter business details | 10 minutes |
| 4 | Enter turnover figures and threshold date | 5 minutes |
| 5 | Add bank details for refunds | 2 minutes |
| 6 | Review and submit | 5 minutes |
| 7 | Wait for your VAT number | Up to 30 working days |
What happens after you register for VAT online
When HMRC approves your application, you receive a VAT registration certificate showing your VAT number and your effective date of registration. From that date you must:
Once registered, you’ll charge VAT on your invoices — this free VAT calculator works out exactly how much to add.
- Charge VAT on your taxable sales at the correct rate (usually 20%) and show your VAT number on every invoice.
- Keep digital VAT records and submit your VAT returns through Making Tax Digital-compatible software such as Xero, QuickBooks or FreeAgent — this is compulsory for all VAT-registered businesses.
- File and pay on time. VAT returns are usually quarterly, and late returns or payments attract penalties and interest.
One more thing worth deciding early: which VAT scheme suits you. The standard scheme works for most businesses, but the Flat Rate Scheme or cash accounting can simplify life for smaller ones. GOV.UK has a clear overview of the VAT schemes and who each one suits, which is worth reading before your first return is due.
3 mistakes that delay VAT registration
Applying with mismatched details. As mentioned, names and numbers must match HMRC’s records exactly. If you recently changed a director’s name or moved address, update those records first.
Forgetting the forward-looking test. Many businesses watch the 12-month rolling total but miss the second trigger: if a single big contract means you will exceed £90,000 in the next 30 days, you must register immediately — not when the money lands.
Charging VAT before the number arrives. It is tempting to add VAT to invoices while you wait, but you cannot issue a valid VAT invoice without a VAT number. Price as though you are registered, keep records, and issue proper VAT invoices once the number lands.
Frequently asked questions
How long does it take to register for VAT online?
The online application itself takes about 30 minutes. HMRC aims to process applications within 30 working days, though it can take longer at busy times. You cannot charge VAT until your VAT number arrives.
Can I register for VAT online as a sole trader?
Yes. Sole traders register through the same online service. You will need your National Insurance number and your Unique Taxpayer Reference (UTR) from your Self Assessment records, plus your business and bank details.
What is the VAT registration threshold in 2026?
The threshold is £90,000 of VAT-taxable turnover in any rolling 12-month period, or £90,000 expected in the next 30 days alone. Once you cross it, you have 30 days to register.
Do I need an accountant to register for VAT?
No, the online process is designed for business owners to complete themselves. That said, an accountant is valuable for choosing the right VAT scheme and setting up Making Tax Digital software before your first return.
The bottom line
Registering for VAT online is one of the more straightforward HMRC processes: one Government Gateway login, seven steps, about half an hour of your time. The delays almost always come from sloppy details or missed deadlines, not from the system itself. Get your paperwork in order, match HMRC’s records exactly, apply as soon as the threshold bites, and your VAT number will arrive without drama.
