The UK VAT registration threshold is £90,000 of taxable turnover, and it's checked on a rolling 12-month basis — not against your annual accounts. Once your turnover crosses that figure in any trailing 12-month period, you have 30 days to notify HMRC, and your registration becomes effective from the first day of the second month after you crossed the threshold. Non-UK sellers storing inventory in UK warehouses, including Amazon FBA sellers, face a completely different rule: a £0 threshold, meaning registration is required from the very first sale.
Disclaimer: This article is for general educational purposes only and isn't personalized tax or legal advice. VAT rules involve genuine complexity around specific business circumstances — confirm your situation with a UK accountant or HMRC directly before registering or choosing a VAT scheme.
The #1 Misconception: "I'll Check My VAT Threshold at Year-End"
This is worth clearing up immediately, because it's the single most common way UK businesses end up with an unexpected backdated VAT bill.
Most business owners assume HMRC checks their turnover against their accounting year or the UK tax year. It doesn't. VAT registration is assessed on a rolling 12-month basis, recalculated at the end of every single calendar month. That means a business could be comfortably under £90,000 for its official accounting year, and still trigger a mandatory registration obligation partway through — purely because the trailing 12-month total tipped over the line in, say, May.
Here's a concrete example: at the end of August 2026, a business adds up all taxable turnover from September 2025 through August 2026. If that total exceeds £90,000, HMRC must be notified by 30 September 2026, and the effective registration date becomes 1 October 2026. Miss this, and HMRC can backdate your registration — meaning you may owe VAT on sales where you never charged your customers for it in the first place.
The practical fix: check your rolling 12-month taxable turnover at the end of every month, not once a year.
What Is VAT, and What Is the Registration Threshold?
VAT (Value Added Tax) is a tax charged on the sale of most goods and services in the UK. Businesses below the registration threshold don't have to charge it; once registered, you must charge VAT on your taxable sales, file regular returns, and can generally reclaim VAT on your own business purchases.
The current threshold: £90,000 of taxable turnover in any rolling 12-month period. This figure has been unchanged since April 2024 and remains the same for the 2026/27 tax year.
Taxable turnover includes:
- Standard-rated sales (most goods and services)
- Reduced-rated sales
- Zero-rated sales (like books and children's clothing) — these are taxed at 0%, but they still count toward your £90,000 threshold, which surprises a lot of business owners
Taxable turnover does NOT include:
- VAT-exempt supplies (such as insurance, finance, or certain education and healthcare services)
If your business only makes exempt supplies, you generally don't need to register for VAT at all, regardless of how much you turn over.
The Two Tests: Rolling 12-Month Rule vs. Forward-Look Test
Most guides only mention one of these. Understanding both is genuinely important, because the second one catches even well-run businesses off guard.
Test
How It Works
Notification Deadline
Effective Registration Date
Rolling 12-Month (Historical) Test
At the end of every calendar month, check your total taxable turnover for the trailing 12 months
Within 30 days of the month-end you crossed the threshold
First day of the second month after crossing
Forward-Look Test
If you expect turnover to exceed £90,000 in the next 30 days alone (e.g., a large one-off contract)
Immediately
From the start of those 30 days
The forward-look test exists specifically for businesses that land a large contract or project that would push them well past £90,000 before month-end — it prevents businesses from "waiting out" the rolling test when a big, obvious jump is already known.
Do I Need to Register for VAT? A Quick Decision Framework
- Has your rolling 12-month taxable turnover exceeded £90,000? → Mandatory registration required.
- Do you expect to exceed £90,000 in the next 30 days alone (e.g., a large contract just signed)? → Mandatory registration required, immediately.
- Are you a non-UK seller storing inventory in a UK warehouse (including Amazon FBA)? → Registration required from your first sale, regardless of turnover.
- Is your turnover below £90,000 and you don't meet the above? → Registration is optional (voluntary).
Voluntary VAT Registration: When It Makes Sense
You don't have to wait until you hit the threshold. Many businesses register voluntarily — HMRC data shows a significant share of VAT-registered businesses have turnover below the mandatory threshold.
Voluntary registration can make sense if:
- You sell mainly to other VAT-registered businesses (who can reclaim the VAT you charge, so it's not a real cost to them)
- You have significant VATable expenses and want to reclaim input VAT
- You want to appear more established to clients, since some businesses associate VAT registration with credibility and scale
Voluntary registration is usually less appealing if:
- Your customers are mostly individual consumers who can't reclaim VAT — meaning your prices effectively rise by the VAT rate, or your margins shrink to absorb it
- You have very few VATable business expenses, so there's minimal input VAT to reclaim
Sole Traders and VAT: Does It Work the Same Way?
Yes — the £90,000 threshold and rolling 12-month rule apply identically to sole traders as to limited companies. One detail that surprises many sole traders: the threshold applies to the individual, not to each separate trade. If you run two different sole trader businesses, HMRC doesn't give you two separate £90,000 allowances — your combined turnover across all your business activities counts toward the single threshold.
This applies equally to freelancers, contractors, and consultants. If you're weighing whether operating as a sole trader or forming a limited company makes more sense for your situation more broadly (VAT is just one factor among several), our comparison of sole trader vs. limited company tax treatment covers the wider decision.
How to Register for VAT: Step by Step
- Confirm you've crossed the threshold (or decide to register voluntarily).
- Gather your details — business turnover figures, bank details, Unique Taxpayer Reference (UTR), and business activity information.
- Register online through your Government Gateway account, or via post using a VAT1 form in certain circumstances (some business types, like specific overseas businesses, must use paper forms).
- Notify HMRC within 30 days of crossing the threshold, or immediately under the forward-look test.
- Receive your VAT registration certificate (VAT4) and VAT number — this typically takes around 30 working days, though it can vary.
- Start charging VAT on all taxable sales from your effective registration date.
- Set up Making Tax Digital (MTD) compatible software, since all VAT-registered businesses must keep digital records and submit VAT returns digitally from their very first return — voluntary or mandatory.
If you're setting up a UK company as part of this process and haven't registered with Companies House yet, our guide on registering a UK company as a non-resident walks through that earlier step, and our Companies House compliance checklist covers what follows afterward.
What Happens If You Register Late?
Late VAT registration carries real financial consequences:
- Backdated VAT liability — HMRC can require you to pay VAT on sales made from your correct effective registration date, even if you never charged your customers for it during that period
- Penalties — late registration penalties can reach up to 15% of the VAT owed, depending on how late the registration is and whether HMRC judges it deliberate or careless
- Interest — on top of the VAT owed and penalty, interest accrues on the outstanding amount
If you suspect you've already crossed the threshold without registering, proactively disclosing this to HMRC generally results in significantly reduced penalties compared to waiting for HMRC to identify the gap independently — the same principle that applies broadly across UK tax compliance. Our guide on what happens when you miss a tax deadline covers this broader dynamic in more depth.
VAT Registration for Non-UK Sellers and Amazon FBA Businesses
This is where the rules diverge sharply from the standard UK business threshold, and it catches a lot of international ecommerce sellers off guard.
If you're a non-UK business storing inventory in a UK warehouse — including via Amazon FBA — the £90,000 threshold does not apply to you. Instead, you face a £0 threshold, meaning VAT registration is required from your very first sale into the UK, regardless of volume.
This is a fundamentally different rule than the domestic threshold, and it's a common trap for US and international sellers expanding into the UK market who assume the same £90,000 buffer applies to them. If you're planning cross-border ecommerce operations and weighing structure decisions around this, our comparison of LLC vs. Ltd for ecommerce businesses is a useful companion resource for the broader entity-structure question.
VAT Schemes Worth Knowing About
Once registered, businesses can choose between different VAT accounting schemes, most notably:
- Standard VAT Accounting — charge VAT on sales, reclaim VAT on purchases, pay the difference each quarter
- Flat Rate Scheme — pay a fixed percentage of your VAT-inclusive turnover, simplifying record-keeping for smaller businesses, though it isn't always the most cost-effective option depending on your expense profile
Choosing the right scheme depends heavily on your specific expense structure and sales pattern, and it's genuinely worth discussing with an accountant before committing, since switching later adds administrative complexity.
Frequently Asked Questions
What is the VAT registration threshold in 2026? £90,000 of taxable turnover in any rolling 12-month period. This has been unchanged since April 2024 and remains the same for 2026/27.
Do I have to register for VAT if my turnover is under £90,000? Not unless you're a non-UK seller storing inventory in a UK warehouse (where the threshold is £0) or you expect to exceed £90,000 in the next 30 days alone. Otherwise, registration below the threshold is voluntary.
How long do I have to notify HMRC after crossing the threshold? 30 days from the end of the month in which your rolling 12-month turnover exceeded £90,000.
What happens if I register for VAT late? HMRC can backdate your registration, requiring VAT payment on sales during the missed period, plus penalties of up to 15% of the VAT owed and interest on the outstanding amount.
Can I register for VAT voluntarily? Yes. Voluntary registration is available to any business below the threshold and can make sense if you sell mainly to VAT-registered businesses or have significant reclaimable input VAT.
Do exempt sales count toward the VAT threshold? No. VAT-exempt supplies don't count toward the £90,000 threshold, but zero-rated supplies do, even though they're taxed at 0%.
Do non-UK businesses need to register for UK VAT? Yes, and the rules are stricter than for UK businesses. Non-UK sellers storing stock in UK warehouses face a £0 threshold, requiring registration from their first sale.
Final Thoughts: Monitor Monthly, Not Annually
The businesses that get caught out by VAT registration rarely do so through negligence — they simply check the wrong number at the wrong time. Reviewing turnover once a year against annual accounts misses the rolling 12-month test entirely, and it's exactly this gap that leads to backdated VAT bills and unnecessary penalties. Checking your trailing 12-month taxable turnover at the end of every month takes a few minutes and eliminates the single most common VAT registration mistake in the UK.
For authoritative source information on current thresholds and registration procedures, HMRC's official VAT registration guidance on GOV.UK is the most reliable place to confirm your specific requirements before registering.
Approaching the VAT threshold, or unsure whether your business needs to register? Brandora Services helps UK and international sellers determine their VAT obligations, register correctly, and choose the right VAT scheme for their situation. Explore our services or get in touch for guidance tailored to your specific business.