VAT is the UK tax most likely to catch a growing business by surprise, because the trigger is not a tax year or a profit figure. It is a rolling twelve-month total that can be crossed in any month, including one where you made no profit at all.
Cross it and you have 30 days to register. Miss that and you owe VAT on sales where you never charged it — out of your own margin, because you cannot realistically go back to customers months later asking for another 20%.
This guide covers when registration becomes compulsory, the rule that removes the threshold entirely for overseas businesses, how Making Tax Digital changed filing, and the points-based penalty system that replaced the old surcharge regime.
The short answer
- Registration is compulsory once taxable turnover exceeds £90,000 in any rolling twelve-month period.
- It is also compulsory immediately if you expect to exceed £90,000 in the next 30 days alone.
- Businesses with no UK establishment have no threshold — registration is required from the first taxable sale.
- All VAT-registered businesses must keep digital records and file through Making Tax Digital software. Spreadsheets alone are not enough.
- Returns are usually quarterly, due one month and seven days after the period ends.
The threshold, and how it is measured
The registration threshold is £90,000 of taxable turnover, unchanged since April 2024 when it rose from £85,000.
Two features cause most of the trouble. It is rolling, not annual: you look back over the last twelve months from the end of every month, so it can be crossed in March as easily as at your year end. And it counts taxable turnover, not profit — a business with £95,000 of sales and £10,000 of profit is over the line.
Taxable turnover includes sales at the standard rate, the reduced rate and the zero rate. Zero-rated is not the same as exempt: zero-rated sales count towards the threshold even though no VAT is charged on them. Genuinely exempt supplies do not.
There is also a forward-looking test. If at any point you expect to exceed £90,000 in the next 30 days by itself — a single large contract, for instance — you must register immediately, without waiting to look back.
The rule that removes the threshold
This is the point most often missed by founders selling into the UK from abroad.
The £90,000 threshold is available to businesses established in the UK. A business with no UK establishment — a non-established taxable person — has no threshold at all and must register from its first taxable supply in the UK.
So the distinction matters enormously. If you have formed a UK limited company with a genuine UK establishment, the threshold applies to you normally. If you are selling into the UK through an overseas entity with no UK presence, you may be required to register from pound one.
Whether a company has a UK establishment is a question of substance — human and technical resources present in the UK — not simply whether it is registered at Companies House. If your structure is borderline, this is worth confirming rather than assuming, because getting it wrong means either registering unnecessarily or trading unregistered when you should not be.
Voluntary registration
You may register below the threshold, and it is often sensible.
It makes sense when your customers are VAT-registered businesses who reclaim what you charge, so your prices are effectively unchanged for them while you recover VAT on your own costs. It also helps if you have significant input VAT — equipment, software, professional fees — or if you export, since zero-rated sales still allow input recovery. Some larger clients also read a VAT number as a sign of scale.
It is a poor idea when you sell mainly to consumers or to non-registered small businesses, because adding 20% either raises your price or cuts your margin, with no offsetting benefit to the buyer.
Rates
| Rate | Level | Typical examples |
|---|---|---|
| Standard | 20% | Most goods and services |
| Reduced | 5% | Domestic fuel, some energy-saving materials |
| Zero | 0% | Most food, books, children’s clothing, most exports |
| Exempt | No VAT | Insurance, some financial and education services |
The distinction between zero-rated and exempt matters more than it appears. Zero-rated supplies count towards the threshold and let you reclaim input VAT. Exempt supplies do neither. A business making only exempt supplies generally cannot register at all.
You can model the effect of a rate on a net or gross figure with our VAT calculator.
Making Tax Digital
MTD for VAT applies to every VAT-registered business regardless of turnover. There is no small-business exemption.
It imposes two requirements. You must keep digital records of supplies made and received. And you must file through compatible software that connects directly to HMRC — you cannot type figures into the HMRC website any more.
There is a further requirement people overlook: digital links. Data must flow between systems digitally, without manual retyping. If your sales sit in one system and your return is prepared in another, copying a total across by hand breaks the rule. Bridging software or a linked spreadsheet formula satisfies it.
In practice this means ordinary cloud accounting software, which most businesses use anyway. Spreadsheets are permitted only where they are connected to HMRC through bridging software.
Filing and payment deadlines
Most businesses file quarterly. The return and the payment are both due one calendar month and seven days after the end of the VAT period.
A quarter ending 31 March is therefore due by 7 May. Payment must reach HMRC by then, so allow for clearing time — particularly if you are paying internationally, where a transfer initiated on the deadline will arrive late.
You must file a return for every period even if you had no sales. A nil return is still a return, and its absence still earns a penalty point.
The points-based penalty system
The old default surcharge was replaced by a points system that treats late filing and late payment separately — so a single late return that is also paid late can attract both.
Late submission. Each late return earns one point. When you reach the threshold for your filing frequency you receive a £200 penalty, and a further £200 for every subsequent late return while you remain at the threshold.
| Filing frequency | Points before a penalty |
|---|---|
| Monthly | 5 |
| Quarterly | 4 |
| Annual | 2 |
Points expire after a period of compliance, so an isolated late return does not follow you indefinitely — but repeated lateness accumulates quickly on a quarterly cycle, where four misses over two years reaches the threshold.
Late payment. Charged as a percentage of the VAT outstanding: nothing if paid, or a payment plan agreed, within 15 days; 2% if 16 to 30 days late; 4% from 31 days, with further interest accruing.
The practical lesson is that if you cannot pay in full, contacting HMRC to agree a time-to-pay arrangement early is materially cheaper than silence.
Choosing a VAT scheme
Standard VAT accounting is not the only option, and for a small business the alternatives can be worth real money or real time.
Cash accounting lets you account for VAT when you are actually paid rather than when you invoice. For a business whose clients pay in 60 or 90 days, this is a significant cash-flow benefit — under standard accounting you can owe HMRC VAT on an invoice your customer has not yet settled. Available to businesses below a turnover limit.
Annual accounting replaces quarterly returns with one annual return plus instalments. It reduces administration and makes payments predictable, at the cost of visibility — a large balancing payment at year end can surprise you.
The flat rate scheme lets you pay a fixed percentage of gross turnover instead of tracking input VAT on every purchase. It suits businesses with few costs, though the limited-cost trader rules mean many service businesses with minimal expenditure pay a high fixed rate that removes the advantage. Run the arithmetic on your own numbers rather than assuming it is simpler and therefore cheaper.
Schemes have eligibility limits and joining conditions, and you cannot always switch freely. Check the current thresholds before committing.
What records you must keep
MTD does not only change how you file. It changes what you must hold and in what form.
You must keep, digitally, the time and value of each supply you make and the rate applied; the time and value of each supply you receive and the input tax you are claiming; your business name and address, VAT number and any schemes you use; and a digital summary from which the return figures are drawn.
VAT records must generally be retained for six years. Invoices themselves may be stored digitally rather than on paper, which for an overseas founder is a practical relief.
The requirement that catches people is the digital link. If your invoicing tool exports a spreadsheet and you retype the total into your VAT software, that manual step breaks the chain even though the numbers are correct. Link the systems, or use one that does both.
Getting your invoices right
Once registered, a VAT invoice must carry specific information, and customers who cannot reclaim because your invoice is deficient will come back to you.
Include a unique sequential invoice number, your business name, address and VAT registration number, the date of issue and the time of supply, the customer’s name and address, a description of the goods or services, the rate and amount charged for each item, the total excluding VAT, the VAT amount, and the total payable.
Charging VAT before your registration number arrives needs care. You cannot show a number you do not yet have, so the usual approach is to raise invoices at a VAT-inclusive value and reissue proper VAT invoices once the number is issued — explaining this to clients in advance avoids an awkward second invoice.
Coming out of VAT
Deregistration is available if your taxable turnover falls below the deregistration threshold, or if you stop making taxable supplies altogether — for instance when a company becomes dormant.
It is not automatic. You apply, and until HMRC cancels the registration you must keep charging VAT and filing returns. Businesses that stop filing on the assumption they have fallen out of the system accumulate penalty points for returns they did not know were still due.
There is a sting on the way out. On deregistration you may owe VAT on business assets you still hold on which input tax was reclaimed, above a de minimis amount — stock and equipment included. Factor that into the decision rather than discovering it on the final return.
If you get it wrong
Errors on past returns are normal and there is a defined route for them. Small errors within limits can usually be corrected on your next return. Larger ones must be disclosed separately to HMRC.
The distinction that determines the penalty is whether the error was careless, deliberate, or an honest mistake despite reasonable care — and, crucially, whether you told HMRC or they found it. Unprompted disclosure attracts substantially lower penalties than a discovery during a compliance check.
If you realise you should have registered months ago, the same logic applies. Late registration is expensive because you owe VAT you never charged, but approaching HMRC yourself is consistently better than waiting.
A worked example
Sana runs a UK limited company providing marketing services, mostly to UK business clients. Her rolling twelve-month turnover reaches £92,000 at the end of September.
She has crossed the threshold in September, so she must register within 30 days — by the end of October — and will be registered from 1 November. From that date she charges 20% on her standard-rated sales.
Because her clients are VAT-registered businesses who reclaim it, her invoices rise by 20% but her clients’ net cost does not change. She can now also recover VAT on her software, subcontractors and professional fees, which she could not before.
Had her customers been consumers, the same registration would have meant either raising prices by a fifth or absorbing the VAT from her margin — which is why the same threshold feels very different depending on who you sell to.
Common mistakes
- Checking turnover only at the year end. The test is rolling and monthly.
- Confusing turnover with profit. The threshold looks at sales.
- Excluding zero-rated sales from the calculation. They count.
- Assuming the threshold applies to an overseas business. Without a UK establishment there is no threshold.
- Skipping nil returns. They are still due and still earn points if missed.
- Retyping figures between systems, breaking the digital links requirement.
- Spending the VAT you collected. It is HMRC’s money held temporarily.
Place of supply, and who accounts for the VAT
Every question that begins “do I charge VAT to a customer in another country” is really a question about place of supply — the rules that decide which country’s VAT applies at all. They are detailed, but the shape of them is learnable and it settles most cases.
| What you supply | To whom | General position |
|---|---|---|
| Services | A business outside the UK | Outside the scope of UK VAT. The customer accounts for it |
| Services | A consumer outside the UK | Usually where you belong, so UK VAT — with important exceptions |
| Digital services | A consumer outside the UK | Where the consumer is. May mean registering abroad |
| Goods | Exported from the UK | Zero-rated, if you hold evidence of export |
The first row is the one most service businesses live in, and it is where the reverse charge appears. Supplying consultancy, design or development to a business in Germany or the United States, you do not charge UK VAT. Your customer accounts for the VAT in their own country, at their own rate, and in most cases recovers it in the same return so nothing actually moves. You still record the sale and show on the invoice that the reverse charge applies.
The zero-rating in the last row is conditional, not automatic. You need commercial evidence that the goods actually left the country, obtained within the time limit — commonly three months. No evidence, no zero-rating, and HMRC assesses the VAT as though the sale had been domestic.
Now the part that catches small companies, because it works in the opposite direction from everything above. The reverse charge applies to what you buy, too. When a UK business buys in services from a supplier abroad — advertising, cloud hosting, software subscriptions, an overseas contractor — it must account for UK VAT on that purchase itself, charging itself the output tax and reclaiming it as input tax.
And here is the sting: the value of those purchased services counts towards your VAT registration threshold. A consultancy turning over £70,000 and spending £25,000 a year on overseas advertising and software is over £90,000 for registration purposes, despite having sold nothing like that much. Businesses discover this late, and by then the registration date has already passed.
The gap between applying and getting your number
Registration is not instant, and the weeks in between create a practical problem nobody warns you about.
When HMRC registers you it sets an effective date of registration, and your liability to account for VAT runs from that date — not from the day the number arrives. If processing takes six weeks, you owe VAT on six weeks of sales made before you had a number to put on an invoice.
You are not permitted to issue a VAT invoice without a VAT number, and you cannot describe an amount as VAT before you are registered. The accepted way through is to raise invoices in the interim for the VAT-inclusive amount without identifying any VAT on them, explain to the customer why, and then reissue proper VAT invoices once the number comes through so a business customer can reclaim it.
The alternative — invoicing at your old prices and absorbing the VAT yourself — is a straight cut to your margin of one sixth on every standard-rated sale in the gap. On a busy quarter that is a real number.
Two things reduce the pain. Apply as soon as you can see the threshold approaching rather than after you cross it, since the forward-looking test may already require it. And tell affected customers in advance: a business client reclaiming the VAT is indifferent, but a consumer receiving a corrected invoice for 20% more than they expected is a conversation worth having before it happens rather than after.
Frequently asked questions
How quickly must I register after crossing?
Within 30 days of the end of the month in which you exceeded the threshold. Registration then takes effect from the first day of the following month.
Can I register before I need to?
Yes. Voluntary registration is common where customers are VAT-registered or input VAT is significant.
Do I charge VAT to overseas customers?
It depends on the place-of-supply rules, which differ for goods and services and for business and consumer customers. Many exports are zero-rated, but do not assume it — the rules are detailed and worth checking for your specific situation.
What if I go over the threshold once and then fall back?
You may apply for exception from registration if you can show turnover will fall below the deregistration threshold in the next twelve months. It must be applied for — it is not automatic.
Can I still use spreadsheets?
Only with bridging software connecting them to HMRC, and with digital links between systems. A spreadsheet alone does not satisfy MTD.
What happens if I register late?
You owe VAT from the date registration should have started, whether or not you charged it, plus possible penalties. Late registration is one of the more expensive VAT errors precisely because the tax comes from your margin.
Do points ever disappear?
Yes. They expire after a sustained period of filing on time, provided all outstanding returns are up to date.
Staying on top of it
VAT rewards monitoring and punishes discovery. Check your rolling twelve-month turnover monthly rather than annually, know whether the threshold applies to your structure at all, keep the VAT you collect separate from your working capital, and file nil returns as diligently as busy ones.
We handle UK VAT registration and quarterly MTD filing for non-resident founders alongside UK company formation and confirmation statements. Get in touch if you are approaching the threshold or already past it.
This article is general information, current as at September 2026, and is not tax advice. Remotix BPO is a business process outsourcing company and is not an accounting firm. VAT rules are detailed and change — confirm your position with HMRC or an adviser before acting.
