Do you need to register for VAT?

VAT is the point where a lot of tradespeople stop growing on purpose. They get near the threshold, work out that going over means adding 20% to every domestic price, and quietly turn work away for the rest of the year.

That's sometimes the right call and often not. It depends almost entirely on who your customers are. Here's how the decision actually works. The threshold, rates and scheme rules change — confirm the current figures on gov.uk before you act. Everything below is the shape of the decision, not tax advice.

When you must register

You must register for VAT when your VAT taxable turnover passes the registration threshold. There are two tests, and people usually only know the first:

1. The backward look — your taxable turnover over the previous rolling 12 months exceeds the threshold. Note: rolling 12 months, not your accounting year, not the tax year. You have to watch it monthly.
2. The forward look — you expect to exceed the threshold in the next 30 days alone. This catches people who land one big job. If a single contract will take you over inside a month, you register immediately, and the registration takes effect from the start of that period.

Taxable turnover is turnover, not profit. It's what you invoiced, including materials you supplied. That surprises people: a plumber turning over a lot of boilers has a big taxable turnover and a modest profit, and it's the turnover that counts.

There's also a deregistration threshold, lower than the registration one, if your turnover falls.

There can be an exception if you go over temporarily and can show you'll drop back under — but you have to apply for it, not assume it.

The domestic problem, stated plainly

If your customers are homeowners, they can't reclaim VAT. So when you register, one of two things happens:

• You add VAT on top and your prices effectively jump 20% overnight, or
• You absorb it and your margin drops by roughly a sixth of your prices

Neither is fun. That's the real reason trades hover under the threshold.

If your customers are VAT-registered businesses — main contractors, landlords with VAT-registered property businesses, commercial clients — it's completely different. They reclaim the VAT, so your price to them is unchanged in real terms, and you get to reclaim VAT on everything you buy. Registration is often a straight win.

Most trades are somewhere in between, and the mix is what decides it.

The arithmetic of voluntary registration

You can register voluntarily below the threshold. It's worth doing when:

• Most of your customers are VAT registered. They don't care, you reclaim on materials, van, tools, fuel and overheads. Free money.
• You're materials-heavy. If you buy a lot, the reclaim is meaningful.
• You want to look bigger. A VAT number on your paperwork reads as an established business. Some commercial clients treat it as a filter.
• You're about to buy something big — a van, a plant item. You may be able to reclaim VAT on certain pre-registration purchases, subject to time limits and conditions.

It's a bad idea when you're purely domestic and labour-heavy — you'd be adding 20% to your prices to reclaim VAT on very little.

Watch the cliff edge

The genuinely awkward zone is turnover a bit above the threshold on domestic work. You've added VAT to all your prices but you're only marginally bigger — so your take-home can actually fall as you cross over.

Two honest options:

Stay under, deliberately. Manage turnover, take fewer materials-heavy jobs, do labour-only where the customer buys the materials (which keeps their cost off your turnover). This is legitimate business planning. What isn't legitimate is artificially splitting one business into two to keep both under the threshold — HMRC treats that as disaggregation and will aggregate them.

Push well past it. If you're going to be VAT registered, be comfortably above the line so the extra volume covers the hit. The bad place is the first few thousand over.

The strategic version: use the threshold as the moment to shift your customer mix towards commercial and trade work, where VAT doesn't hurt you.

The Flat Rate Scheme

The Flat Rate Scheme lets smaller businesses pay a fixed percentage of gross turnover to HMRC instead of accounting for VAT on every sale and purchase. You still charge customers the normal rate; you just hand over less than you collected and generally can't reclaim input VAT (with an exception for certain capital assets above a value threshold).

It was very popular with labour-only trades. Then the limited cost business rules came in, which push businesses spending little on goods onto a much higher flat rate — which killed the advantage for a lot of service businesses. Whether it still helps depends on your goods spend as a proportion of turnover, and on the current percentages for your trade sector.

Worth an accountant running both ways on your actual numbers. It's a ten-minute sum for them and can be worth thousands.

Other schemes worth knowing exist: cash accounting (account for VAT when you're paid rather than when you invoice — genuinely useful if customers pay late) and annual accounting (one return a year with instalments).

Construction-specific things that bite

The Domestic Reverse Charge. For construction services supplied to another VAT-registered business that isn't the end user, the reverse charge may apply: you don't charge VAT, and your invoice must state that the customer accounts for it. This has a real cashflow consequence for sub-contractors, who lose the VAT they used to hold between collecting and paying. If you sub for other trades, check whether it applies to you — and see getting paid as a subbie.

Reduced and zero rates. Certain construction work isn't at the standard rate — some new build, some conversions, renovations of properties empty for a long period, and certain energy-saving materials have had reduced or zero rating. The conditions are specific and they've changed repeatedly. If a job might qualify, check the current rules for that job — getting it wrong in either direction is expensive.

Materials vs labour. Materials you supply are part of your taxable turnover. If the customer buys their own, they aren't. That's a lever if you're managing turnover near the threshold — just be straight about who's warranting the goods.

What changes day to day once you're registered

• Every price needs a VAT position. Quotes must say whether the figure includes VAT. Ambiguity costs you 20% or an argument. Same on invoices — see what to put on an invoice.
• Returns. Usually quarterly, filed digitally under Making Tax Digital, using compatible software. Paper and spreadsheets alone generally won't do it.
• Record keeping tightens. VAT records have their own retention requirements and must be kept digitally in a specified way.
• VAT is not your money. Put it in a separate account the day it's paid to you. This is the single most common way businesses get into trouble with HMRC — see how much to set aside for tax.
• Penalties. Late registration, late returns and late payment all carry penalties, and the regime for these has been reformed to a points-based system. Check the current one.

The decision, in five questions

1. What's my rolling 12-month turnover? Check it monthly, not annually.
2. What proportion of my customers are VAT registered? Mostly businesses → register. Mostly homeowners → think harder.
3. How materials-heavy am I? More materials → more to reclaim.
4. Where do I want the business to be in two years? If it's growing, you'll cross the line anyway — better to plan it than trip over it.
5. Have I had an accountant run the numbers? Do this before deciding. It's cheap and it's the only version of this article with your actual figures in it.

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