VAT registration for UK tradespeople: when to register and what it costs

Most tradespeople think about VAT once — the day their accountant says "you’ve gone over." Then the panic. Here’s the plain version, before the panic.

When registration becomes compulsory

If your rolling 12-month turnover (not profit, not calendar year — rolling 12 months) goes over £90,000, you must register within 30 days of the end of the month it happened. The threshold moves with HMRC budgets; it was £85,000 until 2024.

Turnover means everything you invoiced, including materials, labour and callouts. If you’re subcontracting, your invoices to the main contractor count.

Why you might register voluntarily

• Your customers are mostly businesses that reclaim VAT — you lose nothing by adding it
• You buy a lot of VAT-charged materials (boilers, cables, tools) and want to reclaim the 20%
• You want the credibility of a VAT number on invoices for commercial contracts

You lose out if most of your customers are homeowners — they don’t reclaim, so adding 20% to your prices hurts you competitively.

Standard VAT vs Flat Rate Scheme

Standard VAT: charge 20% on your invoices, reclaim 20% on your purchases, pay the difference every quarter.

Flat Rate Scheme (FRS): charge 20% on invoices, keep a flat percentage of gross turnover (around 9.5–12% depending on trade), pay the rest to HMRC. You can’t reclaim VAT on purchases under £2,000. Good for labour-heavy trades with few material purchases; bad if you’re buying a lot of parts.

As of 2026, the FRS percentages for relevant trades are roughly: general building (9.5%), electricians (11.5%), plumbers (9.5%), painters and decorators (10.5%), gas engineers (11.5%). Check the current list on gov.uk — rates change.

What VAT registration actually changes for you

• Your invoices must show your VAT number, the VAT rate applied per line, and the VAT amount
• You file a VAT return every 3 months (on MTD-compliant software — see our MTD guide)
• You pay HMRC by the 7th of the second month after the quarter end
• You reclaim VAT on legitimate business purchases by keeping receipts

Common mistakes

• Registering late. HMRC backdates the registration and you owe VAT on sales you thought were VAT-free. Brutal.
• Forgetting MTD. All VAT returns must go through MTD software from day one. No spreadsheets directly.
• Not adjusting prices. If you were charging £1,000 for a job and now it’s £1,200 with VAT, homeowners notice. Brief them before the first invoice.
• Not reclaiming on pre-registration purchases. You can reclaim VAT on goods bought up to 4 years before registration and services up to 6 months before, if they relate to current business use. Most tradespeople miss this.

Should you register?

Under £90k turnover, serving mostly homeowners: stay unregistered. You’re competitive. Over £90k: you don’t have a choice. Close to £90k and growing: plan the transition now — briefing customers, repricing, picking a scheme.

Holdfort handles VAT automatically on every invoice once you enter your VAT number and scheme. Quarterly returns ready in one chat message. £29.99/month, all in.

Flat Rate vs Standard — a worked comparison

Consider a plumber with £100,000 turnover (gross), £20,000 materials costs (VAT inclusive), and £70,000 labour.

Standard VAT

• Output VAT charged: £100,000 × 20% = £16,667 (on £83,333 net)
• Input VAT reclaimed: £20,000 × 20/120 = £3,333
• VAT paid to HMRC: £13,334
• Net income kept: £83,333 - £16,667 materials net = £66,666

Flat Rate Scheme (plumber rate 9.5%)

• Gross turnover with VAT: £120,000 (£100,000 + 20% VAT customers paid)
• FRS percentage applied to gross: £120,000 × 9.5% = £11,400 paid to HMRC
• No input VAT reclaim (except single capital items over £2,000)
• Net income kept: £120,000 - £11,400 - £20,000 materials = £88,600

In this example, FRS keeps more money if materials are a small portion of turnover. If materials were £60,000 (60% of turnover, e.g. a boiler-install-focused plumber), Standard wins because you’re reclaiming materials VAT that FRS ignores.

Rule of thumb: FRS wins if materials are under 15-20% of turnover. Standard wins above that. Calculate both for your specific business before choosing — you’re locked in for 12 months.

What changes in your day-to-day when you register

• Every invoice shows VAT. Your prices visibly go up 20% to the customer (unless you absorb it). Brief customers in advance — "from 1 May I’ll be charging VAT, so the quote we agreed of £5,000 becomes £6,000." Most accept it if warned.
• Quarterly VAT return. Add to your calendar: due one month + 7 days after quarter end. E.g. quarter ending 31 March, VAT return due 7 May.
• MTD software required. VAT has been MTD since April 2022. Can’t file VAT from paper records; must go through recognised software or bridging software on top of spreadsheets.

Pre-registration VAT reclaim — often missed

You can reclaim VAT on:

• Goods purchased up to 4 years before registration, if still owned at registration date and used in the VAT-registered business.
• Services received up to 6 months before registration.

For a plumber who bought a £12,000 van 18 months before registering for VAT, that’s £2,000 of VAT reclaimable on the first return. Most tradespeople miss this because they didn’t know to save the van invoice.