The £90,000 VAT threshold: every tradesman's cliff edge, explained

There’s a number that quietly shapes how thousands of UK trades run their year: £90,000. Cross it and you must register for VAT — and for a trade whose customers are homeowners, that can mean becoming 20% more expensive overnight without earning a penny more.

Here’s how the threshold actually works (it’s sneakier than most people think), what it looks like historically, and a calculator to check how close you are.

The rule most trades get wrong

VAT registration isn’t about the tax year. HMRC tests your rolling 12-month turnover at the end of every month. Add up the last 12 months, every month; the moment that total passes £90,000, the clock starts — you must register within 30 days of the end of that month.

That’s why the busy trades get ambushed. A cold snap fills a heating engineer’s winter; by March the rolling total quietly crosses the line, while the “tax year” view still looks safe.

Check your headroom

If you’re in the amber zone, don’t wait: the worst version of this is finding out in hindsight that you crossed months ago — HMRC can backdate your registration and expect VAT on work you already invoiced without it.

How we got to £90,000

The threshold barely moved for seven years while prices — and every tradesman’s material costs — soared:

Because the threshold lagged inflation so badly, “a decent year for a one-man band” and “VAT registered” now describe roughly the same business. This isn’t a big-company problem anymore.

Your three real options at the edge

1. Manage the workload. Plenty of sole traders deliberately sit at £80–85k: fewer jobs, better margins, no VAT admin. The catch — materials count toward turnover. Billing £15k of bathroom fittings you bought for a customer eats headroom that never touched your pocket. (Trick of the trade: on big jobs, have customers buy major materials directly.)

2. Register and reposition. VAT stings customers, but registration cuts both ways: you reclaim VAT on the van, fuel, tools and materials. Combined with moving upmarket — bigger jobs, higher day rates, more commercial and landlord work (who reclaim VAT and don’t care) — plenty of trades come out ahead.

3. Grow through it on purpose. The worst place to sit is just over: all the admin and price pain, none of the scale. If you cross, cross with a plan — a second pair of hands, higher-value work, and marketing that keeps the diary full at the new prices.

Whichever way you lean, decide before the rolling total decides for you — with an accountant, not a forum thread.

Growth you can steer

The uncomfortable truth in all of this: most trades don’t control their growth — work arrives by word of mouth in lumps, and turnover does whatever it wants. A steady, controllable source of enquiries changes that. When your website brings a predictable stream of the jobs you want, you can pick the work that fits the plan — bigger jobs if you’ve registered, premium small jobs if you’re staying under.

That’s the bit we build. Get a free mockup — and keep an eye on that rolling twelve.