VAT for Tradespeople: When to Register and How It Works

VAT is one of those things that feels fine to ignore — right up until your turnover creeps near the threshold and you're suddenly facing a 20% question you've never thought about. Get it wrong and you can land an unexpected bill that wipes out a chunk of a year's profit. Get it right and it's just another bit of admin.

This guide walks through when you have to register, how VAT actually works day to day, and the specific rules that catch trades out — like the construction reverse charge. It's a starting point, not tax advice, so check the current rules on GOV.UK or with your accountant before you make a decision.

When you must register for VAT

You're legally required to register for VAT once your VAT-taxable turnover crosses the registration threshold. Turnover here means your total sales that aren't VAT-exempt — for most trades that's basically everything you invoice, including labour and materials.

The threshold is a rolling figure, not a calendar-year one. Two tests apply:

• The looking-back test — your taxable turnover over the previous 12 months (any rolling 12-month period) goes over the threshold.
• The looking-forward test — you expect to go over the threshold in the next 30 days alone, for example after winning a big contract.

The threshold changes from time to time and there are de-registration and exception rules too, so always confirm the current figure on GOV.UK rather than relying on a number you half-remember from a mate in the pub.

Tip: Keep a rolling 12-month total of your sales, not just a year-to-date one. The looking-back test trips up trades who only check their figures each April.

If you go over and don't register in time, HMRC can backdate your registration and chase the VAT you should have charged — money you may never be able to claw back from customers. That's the worst-case scenario, and it's entirely avoidable with a bit of tracking.

Should you register voluntarily?

You can register before you hit the threshold, and for some trades it's worth it.

It can make sense if:

• Most of your customers are VAT-registered businesses (commercial work, other contractors). They reclaim the VAT you charge, so it doesn't make you look more expensive — and you get to reclaim VAT on your own purchases.
• You spend heavily on materials, tools, a van or plant. Registering lets you recover the VAT on those costs.
• You want to look more established. Some larger clients won't engage a non-registered trade.

It can hurt if:

• You mostly serve homeowners who can't reclaim VAT. Adding 20% effectively makes you 20% dearer than a non-registered competitor, or squeezes your margin if you absorb it.

The maths depends on your customer mix and your costs. If you're weighing how this hits your pricing, it pairs closely with how to price a job for profit — VAT changes the headline number your customer sees, so your quotes need to be clear about it.

How VAT works day to day

Once registered, you become an unpaid collector for HMRC. The mechanics are simpler than people fear:

1. You add VAT (usually the standard 20% rate, but check — some work qualifies for reduced rates) to your sales invoices. This is your output VAT.
2. You pay VAT on your business purchases — materials, fuel, tools. This is your input VAT.
3. Each VAT period (usually quarterly) you pay HMRC the difference: output minus input.

So if you charged £8,000 of VAT and paid £3,000 on materials, you'd hand over £5,000. You never actually owned the VAT you collected — it was always HMRC's. That's the single most important mindset shift: the VAT on your invoices is not your money.

The trap is spending it. The cash sits in your account between collecting and paying, and it's tempting to treat a healthy-looking balance as profit. Many trades open a separate account and move the VAT portion across as invoices get paid, so the quarterly bill never stings.

VAT is now filed digitally under Making Tax Digital, so you'll need compatible software or a bridging tool to submit returns.

VAT schemes that suit trades

You don't have to use standard VAT accounting. A few schemes are popular with smaller trade businesses:

• Flat Rate Scheme — you charge customers the normal 20% but pay HMRC a fixed lower percentage of your gross turnover, keeping the difference instead of reclaiming input VAT on most purchases. Simple, but watch the "limited cost trader" rules, which can make it far less attractive if you don't buy many materials.
• Cash Accounting Scheme — you account for VAT when you're actually paid, not when you invoice. A real help for cash flow if customers pay slowly, because you're not handing HMRC VAT on invoices you haven't collected yet.
• Annual Accounting Scheme — one return a year with instalments, smoothing the admin.

Eligibility usually depends on turnover, and the right choice depends on your margins and how prompt your customers are. Cash accounting in particular sits well alongside a tight approach to getting paid faster, so you're not financing HMRC out of your own pocket.

The construction reverse charge — don't get caught out

If you do construction work for other VAT-registered businesses, the domestic reverse charge almost certainly affects you. It's the rule that catches the most trades out.

Under the reverse charge, for qualifying construction services supplied to another VAT-registered contractor (who isn't the end user), you don't charge VAT on your invoice. Instead, the customer accounts for it themselves. Your invoice still shows the work and states that the reverse charge applies, but no VAT is added.

In plain terms:

• Working for a homeowner or end user → charge VAT as normal.
• Working as a sub-contractor for another VAT-registered builder within the CIS chain → reverse charge usually applies, so no VAT on your invoice.

It interacts with the Construction Industry Scheme, so if CIS is part of your world it's worth reading how CIS deductions work alongside this. The rules are detailed and there are exceptions, so confirm your specific situation against the current HMRC guidance before changing how you invoice.

Keeping VAT painless

VAT is mostly an admin and discipline problem, not a maths one. The trades who find it stressful are usually the ones reconstructing figures from a shoebox of receipts each quarter.

A job-management system like Gaffer helps by getting the VAT onto your quotes and invoices correctly and consistently, keeping a clean digital record of every sale, and chasing payment so the money to pay HMRC is actually in the bank when the return is due. That's most of the battle — accurate records and getting paid on time. If your admin is currently spread across notebooks and messages, cutting admin time in your trade business is the place to start.

The rest is routine: track your rolling turnover, ring-fence the VAT you collect, file on time, and keep your accountant in the loop.

FAQs

What is the VAT registration threshold for tradespeople?

There's a single VAT registration threshold based on your rolling 12-month taxable turnover — it's the same for all businesses, including trades. The figure is reviewed periodically, so always check the current threshold on GOV.UK before deciding whether you need to register.

Do I charge VAT on labour as well as materials?

Yes. For a standard-rated job, VAT applies to the whole invoice value — labour and materials together — not just the parts you buy in. Some work qualifies for reduced rates, so check whether your specific job is an exception.

What is the VAT reverse charge in construction?

The domestic reverse charge means that for qualifying construction services between VAT-registered businesses in the CIS chain, the customer accounts for the VAT instead of you. You don't add VAT to your invoice but must state that the reverse charge applies.

Can I claim back VAT on tools and my van?

Once VAT-registered, you can generally reclaim the input VAT on genuine business purchases such as tools, materials and a commercial van, provided you have valid VAT invoices. Some costs have restrictions, so keep every receipt and check with your accountant.