Being VAT registered means you collect tax for HMRC on your sales, reclaim the tax you were charged on your purchases, and hand over the difference every quarter.
That is the mechanics. The part that actually changes your business is what it does to your prices — because on the day your registration starts, everything you sell to a consumer effectively gets 20% more expensive, or your income drops by a sixth. There is no third option.
Here is what registration means in practice, what changes on day one, and how to think about the pricing decision.
What VAT registration actually is
VAT is a tax on consumption, not on your business. You are a collection point. You add VAT to what you sell, you recover VAT on what you buy, and you pay HMRC the net figure.
- The VAT you charge customers is output tax
- The VAT you are charged by suppliers is input tax
- Output tax minus input tax is what you owe
If input tax exceeds output tax — common for exporters and food producers — HMRC repays you instead.
Registration becomes compulsory when your taxable turnover exceeds £90,000 in any rolling 12-month period, or when you expect to exceed £90,000 in the next 30 days alone. The threshold has been £90,000 since 1 April 2024. Below that, registering is optional.
Taxable turnover is everything you sell that is not exempt or outside the scope of VAT. It includes zero-rated and reduced-rated sales. It is not the same as profit, and it is not the same as your accounting turnover.
What changes on the day you register
| Before registration | After registration |
|---|---|
| You invoice £1,000 | You invoice £1,000 + £200 VAT |
| VAT on purchases is a cost | VAT on purchases is reclaimable |
| No VAT number | Your VAT number must appear on every invoice |
| No VAT returns | A return every quarter, filed under Making Tax Digital |
| Ordinary business records | Digital records, with digital links between systems |
| No VAT deadlines | One calendar month and 7 days after each quarter ends |
Your effective date of registration is the point everything switches on. If you crossed the threshold on a 12-month look-back, that date is the first day of the second month after the month you went over. If you registered because you expected to cross it within 30 days, it is the date you realised.
You must account for VAT on sales from that date, even if you have not received your VAT number yet.
The three VAT rates
| Rate | % | Applies to |
|---|---|---|
| Standard | 20% | Most goods and services |
| Reduced | 5% | Children’s car seats, domestic fuel and power, some mobility aids |
| Zero | 0% | Most food, children’s clothes, books, exported goods |
Zero-rated and exempt are not the same thing, and the difference decides whether you can reclaim. A zero-rated sale is a taxable sale at 0% — you account for it and you keep full input tax recovery. An exempt sale sits outside the system: no VAT charged, and no reclaim on the costs of making it. Financial services, insurance, most healthcare, education and property transactions are exempt.
A business making only exempt supplies cannot register for VAT at all.
The pricing decision: absorb or pass on
This is the real question, and there are only two answers.
Pass it on. Your prices rise by 20% on standard-rated sales. Your income is unchanged. Your customers pay more.
Absorb it. Your prices stay where they are, but the price now includes VAT. A £600 invoice becomes £500 plus £100 of VAT. Your income drops by one sixth.
Which one you can get away with depends entirely on who is buying.
| Your customers | What to do | Why |
|---|---|---|
| VAT-registered businesses | Pass it on | They reclaim the VAT, so the real cost to them does not move |
| Consumers | Usually absorb, or lose sales | They cannot reclaim anything, so a 20% rise is a genuine 20% rise |
| A mix | Model it | Often means passing on to B2B customers and holding B2C prices |
If every customer is VAT registered, this is not a difficult call. You raise your prices by 20%, they recover 20%, and nothing about the relationship changes. You also start reclaiming input tax you were previously eating.
The 20% cliff edge for B2C businesses
Businesses selling to the public face something harsher than a gradual increase. They face a step.
Take a hairdresser turning over £89,000 a year. Under the threshold, none of it is VAT. Win one more regular client, cross £90,000, and from the effective date of registration every haircut carries VAT.
If prices stay the same, £90,000 of takings is now £75,000 of income and £15,000 of VAT. Income has fallen from £89,000 to £75,000 — growing turnover by £1,000 cost £14,000.
That is the cliff edge, and it is why so many consumer-facing businesses cluster just below £90,000. It is a real distortion, HMRC and the OBR both acknowledge it, and the UK threshold remains one of the highest in the OECD partly because of it.
Three practical responses:
- Split the year. Understand exactly where your rolling 12-month total sits, month by month, so nothing surprises you.
- Check the Flat Rate Scheme. For some sector rates it takes the edge off, though the limited cost business rule means service businesses with almost no goods spend pay 16.5% and gain very little.
- Price deliberately. If you are going to cross, plan the price change rather than discovering it in a quarterly return.
What you must not do is manage turnover by splitting one business artificially across two entities. HMRC has specific powers to direct that closely bound businesses be treated as a single taxable person.
What you have to do once registered
| Obligation | Detail |
|---|---|
| Charge the right rate | Standard, reduced or zero on every taxable sale |
| Issue compliant invoices | Showing your VAT number and the VAT shown separately |
| Keep digital records | Under Making Tax Digital, which applies to all VAT-registered businesses |
| File a return | Usually quarterly, even if there is nothing to pay or reclaim |
| Meet the deadline | One calendar month and 7 days after the period ends, for filing and payment |
| Keep records | 6 years |
Late returns attract penalty points. On quarterly returns, four points triggers a £200 penalty, and every further late return at the threshold costs another £200. Points are separate from the Making Tax Digital for Income Tax points system. Late payment carries interest at 7.75%.
Frequently asked questions
Does being VAT registered mean I pay more tax?
Not directly. VAT is a tax on your customer, collected by you. It only costs you money if you absorb it rather than passing it on — which is the situation most consumer-facing businesses find themselves in.
Do I have to show VAT separately on my invoices?
Yes. A VAT invoice must show your VAT registration number and display the VAT as a separate amount. Your customer needs that to support their own reclaim, and you need it to support yours when the position is reversed.
Can I choose which of my sales to charge VAT on?
No. The rate is determined by what you are selling, not by preference. Getting a rate wrong on a whole product line is one of the more expensive mistakes to correct, so check the classification before you launch.
What if I go over £90,000 by accident, just once?
You can apply to HMRC for a registration exception if your taxable turnover went over the threshold temporarily and you can show it will fall back below the deregistration threshold. HMRC will write to confirm whether you get one. If they say no, they register you.
Do I need to be VAT registered to be taken seriously?
Some larger buyers do prefer VAT-registered suppliers, and a VAT number does signal a certain scale. It is a reasonable tiebreaker but a poor primary reason. If your customers are consumers, the credibility gain rarely covers the 20%.
Getting the returns right
VAT registration is not complicated once the system is set up. It is relentless — four deadlines a year, digital records throughout, and penalties that accumulate quietly if a return slips.
SmartFiling files MTD VAT returns for a fixed fee, working straight from Xero, QuickBooks or FreeAgent. Every return is checked by an ICAEW Chartered Accountant before submission, and the whole process runs online.
