Should you register for VAT before you have to?

Most business owners think about VAT registration as something that happens to them once turnover gets high enough. For some businesses, registering before you have to is the better commercial decision. For others it is an expensive mistake. Here is how to tell them apart.

When you have to register

The VAT registration threshold is £90,000 of taxable turnover, and it remains at that level for the 2026/27 tax year. Two separate tests can trigger it:

• The backward look. If your taxable turnover in any rolling twelve month period exceeds £90,000, you must register. This is not your accounting year. It is any twelve consecutive months, checked at the end of every month.
• The forward look. If you expect to exceed £90,000 in the next thirty days alone, you must register immediately, and this test can catch you long before the rolling total does. One unusually large contract can do it.

The case for registering early

You reclaim VAT on what you buy. If you are spending meaningfully on stock, equipment, software, subcontractors or vehicles, that reclaim is real money. For a business investing ahead of growth, it can be significant.

Your customers may not care. This is the decisive question. If you sell to other VAT registered businesses, they reclaim the VAT you charge, so your price to them is effectively unchanged. Registering costs you nothing commercially and gains you the input tax.

It removes a growth ceiling. Businesses that manage turnover to stay under the threshold are letting a tax rule dictate their strategy, which rarely ends well.

Credibility. A VAT number signals a certain scale. For some buyers that matters more than it should.

The case against

If you sell to the public, you have a problem. Consumers cannot reclaim VAT. You either raise prices by 20% and become less competitive, or absorb it and lose a fifth of your margin. For a hairdresser, a café or a domestic trades business, this is usually decisive.

It is real administration. Quarterly returns, digital records, and Making Tax Digital for VAT compliance, which applies to all VAT registered businesses regardless of turnover.

Mistakes cost money. Getting the wrong rate on a supply, or reclaiming on something blocked, is the sort of error that surfaces at inspection with interest attached.

The schemes worth knowing about

Registration is not one single thing. Depending on your business, one of these may improve the position considerably:

• Cash accounting. You account for VAT when you are paid rather than when you invoice. If your customers pay slowly, this is a meaningful cash flow gain.
• Annual accounting. One return a year with instalments through the year, which smooths the admin and the cash impact.
• Flat rate scheme. A fixed percentage of gross turnover instead of tracking input and output tax separately. Simpler, and better for some low-cost service businesses, worse for anyone with significant purchases.

How to decide

Answer three questions. What proportion of your customers are VAT registered? How much VAT are you currently paying out on purchases and not reclaiming? And how close are you to the threshold on a rolling twelve month basis right now?

If most customers are VAT registered and your input VAT is material, register now. If you sell mainly to consumers and you are nowhere near £90,000, do not. If you are somewhere in between, the answer depends on numbers we can run for you in an afternoon.

What you should not do is find out you crossed the threshold four months ago. Late registration means paying HMRC the VAT you should have charged, whether or not you actually charged it, and that comes straight out of your pocket.

Source: HM Revenue & Customs, VAT registration threshold for 2026/27.