How to Register for VAT in the UK

VAT registration is one of those business milestones that feels like a big deal — and it is, in the sense that it changes how you price, invoice and file. But the actual registration takes about 30 minutes online. The harder part is knowing when you must register, when you should register voluntarily, and what changes afterwards.

How Do I Register for VAT in the UK?

Register online through your HMRC Government Gateway account — it takes around 30 minutes and your VAT number usually arrives within 30 working days (often faster). You must register if your VAT-taxable turnover exceeds £90,000 in the last 12 months (or will exceed it in the next 30 days). You can also register voluntarily below the threshold.

When You Must Register

The £90,000 threshold applies to your “VAT-taxable turnover” — the total value of everything you sell that isn’t VAT-exempt, over a rolling 12-month period (not the tax year, not the calendar year — any 12 months). Two triggers:

• You realise at the end of any month that your taxable turnover for the previous 12 months exceeded £90,000 → register within 30 days.
• At any point you expect to exceed £90,000 in the next 30 days alone (big contract landed) → register immediately.

Miss it and HMRC charges penalties plus backdated VAT — the bill for late registration is painful. Track your rolling 12-month turnover monthly once you’re anywhere near £70k. Don’t guess; know.

When to Register Voluntarily

Below £90k, registration is optional — and sometimes smart:

• You sell mainly to VAT-registered businesses. They reclaim the VAT you charge, so it costs them nothing extra — but you get to reclaim VAT on your own purchases and expenses. Win-win.
• You have significant VAT-able costs. Big equipment purchases, stock, subcontractors — reclaiming 20% VAT on these is real money.
• It looks professional. Some larger clients expect suppliers to be VAT-registered. A VAT number signals “established business”.

Don’t register voluntarily if you sell mainly to consumers — you can’t reclaim from them, so VAT just makes you 20% more expensive than non-registered competitors. A café or high-street shop serving the public gains nothing from voluntary registration.

The Registration Process

1. Log into (or create) your HMRC Government Gateway account.
2. Go to “Register for VAT” and complete the online form — business details, turnover estimate, business activity, bank details for repayments.
3. Submit. HMRC usually processes within 30 working days; straightforward applications often come back in 1–2 weeks.
4. You’ll receive your VAT number, date of registration, and deadlines for your first return.

Most businesses must follow Making Tax Digital — keeping digital records and filing VAT returns through compatible software (not the old HMRC portal). Our guide to Making Tax Digital explains who’s affected and what to do.

What Changes After Registration

• You charge 20% VAT on most sales (some goods/services are 5% or 0% — check your category).
• You reclaim VAT on business purchases and expenses. Keep every VAT receipt — no receipt, no reclaim.
• You file VAT returns quarterly (usually), paying HMRC the difference between VAT charged and VAT reclaimed.
• Your invoices must show your VAT number, the VAT rate, and VAT amount per line — get a proper invoicing template from your accounting software from day one so this is automatic.
• The Flat Rate Scheme may suit small businesses with turnover under £150k — you pay a fixed percentage of turnover instead of tracking every reclaim. Simpler, sometimes cheaper.

Common Mistakes

• Forgetting the rolling 12 months. The threshold isn’t “this tax year” — it’s any consecutive 12 months. Seasonal businesses get caught by this.
• Charging VAT before you’re registered. You can’t charge VAT until your registration date. If there’s a gap, you absorb the cost.
• Not reclaiming everything. Fuel, phones, software, professional fees, stock — if it has VAT and it’s for the business, reclaim it.
• Missing return deadlines. Usually one month and seven days after quarter-end. Late filing = penalties + interest.

The Bottom Line

Track your rolling turnover, register the moment you hit £90k (or earlier if it benefits you), and get MTD-compatible software from day one. VAT feels daunting until you’ve filed two returns — then it’s just admin. If you’re newly incorporated, read our guide to registering a limited company for the full setup sequence. The definitive reference is gov.uk’s VAT registration pages — bookmark them.

VAT Registration: Questions, Answered

What happens if I go over the threshold without realising?

Register as soon as you discover it and tell HMRC — voluntary disclosure gets much lighter penalties than being caught. You’ll owe VAT on sales from the date you should have registered, which you can’t retrospectively charge customers, so it comes out of your pocket. This is why tracking rolling 12-month turnover monthly matters once you’re anywhere near £70,000.

Can I deregister from VAT?

Yes, if your taxable turnover drops below the deregistration threshold (£88,000) — or if you stop making taxable supplies. Deregistration is online via HMRC. Note: you may need to account for VAT on stock and assets held at deregistration (the “deemed supply” rule) if they exceed £6,000. It’s not quite as simple as just stopping.

Do I charge VAT to customers outside the UK?

Exports of goods outside the UK are generally zero-rated (0% VAT) — you don’t charge it, but you still reclaim VAT on related costs, which is why exporters love VAT registration. Services to overseas business customers are usually “outside the scope” of UK VAT. EU sales have specific rules post-Brexit (the goods are exports now, with customs declarations). Get this right — it’s one of the most common VAT error areas.

What’s the VAT Flat Rate Scheme?

A simplification for businesses with turnover under £150,000: instead of tracking VAT on every purchase, you pay HMRC a fixed percentage of your VAT-inclusive turnover (the percentage depends on your trade — e.g., 14.5% for many retailers, lower for some services). You keep the difference between VAT charged and the flat rate paid. It saves admin and often saves money for businesses with low VAT-able costs — but costs money if your costs are VAT-heavy. Run both calculations before choosing.