Should you go VAT registered before you have to

You do not have to register for VAT until your turnover passes £90,000. But you are allowed to register earlier. And for some businesses, registering early is smart.

For others, it is a costly mistake. Here is how to tell which one you are.

The rule that forces your hand

You must register for VAT if your taxable turnover goes over £90,000 in any rolling 12 month period. That clock runs on the last 12 months, not your accounting year.

There is also a forward test. If you expect to pass £90,000 in the next 30 days alone, you must register right away. One big contract can trigger this.

Miss the deadline and HMRC backdates your registration. You then owe VAT on sales from the date you should have registered, even if you never charged it.

Below £90,000, registration is your choice.

When registering early pays off

1. Your customers are businesses. If your clients are VAT registered themselves, they reclaim the VAT you charge. The extra 20 percent costs them nothing. Meanwhile you get to reclaim VAT on your own costs.

2. You spend a lot on materials and tools. Every power tool, van part, and bag of materials you buy carries 20 percent VAT. Once registered, you reclaim it. For a builder fitting a kitchen, that adds up fast.

3. You look bigger than you are. A VAT number on your invoice tells larger clients you run a proper operation. Some contractors will not work with suppliers who are not VAT registered.

4. You can reach back in time. When you register, you can reclaim VAT on goods you bought up to four years before registering, as long as you still own them and use them in the business. VAT on services you bought in the last six months can count too. That van you bought two years ago may still hand you money back.

5. The Flat Rate Scheme suits your numbers. If your VAT turnover is £150,000 or less, you can join the Flat Rate Scheme. You charge clients 20 percent but pay HMRC a lower fixed rate for your trade. For general building and construction it is 9.5 percent. For carpentry 10.5 percent. For plumbing and electrical work 14.5 percent. Your first year gets a 1 percent discount on top.

Watch the trap. If you spend less than 2 percent of turnover on goods, or under £1,000 a year, HMRC calls you a limited cost trader. You then pay 16.5 percent whatever your trade is, and the scheme rarely beats standard VAT. Run both sums on your real figures before you opt in.

When registering early costs you money

1. Your customers are homeowners. A homeowner cannot reclaim VAT. Your £5,000 job becomes £6,000 overnight. Either you lose the work to a cheaper unregistered rival, or you swallow the VAT and lose margin.

2. You do the admin. Registration means quarterly VAT returns and digital records from day one. Paper and memory do not count.

3. Your cash flow feels it. On standard VAT you owe HMRC the VAT when you invoice, not when the customer pays. If clients pay slowly, you are handing over tax on money you have not received. The Cash Accounting Scheme fixes this by taxing you on payment instead. You can use it if your turnover is £1.35 million or less.

The simple decision test

Ask one question first. Who pays your invoices.

Mostly other businesses. Registering early probably pays for itself through reclaimed VAT.

Mostly the public. Wait until the £90,000 threshold forces your hand. Adding 20 percent to your prices before you must is giving away margin.

A mix of both. Split the maths. Work out the VAT you would reclaim on costs, then weigh it against the prices your private customers will bear.

Watch your turnover anyway

Even if you stay unregistered, keep an eye on that rolling 12 month total. The £90,000 test is always running in the background. Cross it without noticing and the backdated bill is yours.

How PlusWise helps

PlusWise keeps your invoices, expenses, and client records in one digital place. That is exactly the foundation VAT registration asks for.

You can see your real sales figures any time, so you know how close you are to the £90,000 line before it surprises you. And if you do register, your invoices and expenses are already organised for your quarterly returns.

Quick answers

Can I deregister if it does not work out? Yes. If your turnover drops below £88,000 you can apply to leave VAT.

Does the threshold count profit or sales? Sales. It is taxable turnover, which includes standard, reduced, and zero rated sales before expenses. Exempt sales usually do not count.

What if I run two businesses as a sole trader? HMRC normally adds the turnovers together for the threshold test.

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Sources checked October 2026: GOV.UK VAT registration guidance; HMRC guidance on pre registration VAT claims and the Flat Rate Scheme.