VAT Registration for Tradespeople: Threshold, Flat Rate Scheme and Reverse Charge

Quick Answer: UK VAT registration is mandatory once taxable turnover exceeds £90,000 in any rolling 12-month period (threshold raised from £85,000 on 1 April 2024 and held at this level in subsequent budgets). Once registered, charge 20% standard rate VAT on most domestic work (5% reduced rate on some energy-saving installations; 0% zero rate on new build dwellings). The Construction Industry Domestic Reverse Charge (DRC) moves VAT accounting to the customer for B2B construction services to other VAT-registered contractors. The Flat Rate Scheme simplifies bookkeeping for small businesses with turnover under £150k but is rarely beneficial for tradespeople with significant materials purchases.

Summary

VAT is the single biggest tax decision a growing trade business will make. Below £90k turnover, you have a choice — register voluntarily or stay below the threshold and operate VAT-free. Above £90k, registration is mandatory. The decision affects your pricing (domestic customers can't reclaim VAT, so your effective prices rise by 20%), your competitiveness with non-registered sole traders, and your administrative burden (quarterly returns under Making Tax Digital).

For a tradesperson, the key questions are: when do I have to register? Should I register voluntarily? Which scheme should I use? And how does the Construction Industry Reverse Charge change my invoicing to other contractors?

This article covers each of those questions in plain trade-business language — not accountant-speak. It is general guidance only; the rules change and personal circumstances vary. For any decision that will significantly affect your business cash flow or growth strategy, consult a qualified accountant.

Key Facts

Quick Reference Table

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Decision When applies Action
Mandatory registration Taxable turnover > £90k in any 12-month rolling period Register within 30 days of crossing threshold
Voluntary registration Turnover below threshold Can register at any time; mainly useful if customers are VAT-registered businesses
Charge 20% standard rate Most domestic repair/maintenance work Invoice with VAT line
Charge 5% reduced rate Energy-saving installation, certain conversions Invoice with reduced VAT; need evidence the installation qualifies
Charge 0% zero rate New build dwellings (after RICS appraisal) Invoice zero VAT; reclaim input VAT on costs
Reverse charge (DRC) B2B construction services to VAT+CIS registered customer Invoice no VAT, mark "Reverse Charge — customer to account for VAT"
Flat Rate Scheme Turnover <£150k, simple operation Apply via HMRC; pay flat % of gross
Cash Accounting Scheme Slow-paying customers Apply via HMRC; pay VAT when paid
Deregister Turnover drops below £88k Apply within 30 days

Detailed Guidance

When do I have to register?

You must register for VAT when your taxable turnover exceeds £90,000 in any rolling 12-month period. "Rolling" means you check each month: the previous 12 months ending today. As soon as the cumulative total crosses £90k, you have 30 days to register from the end of that month.

Two scenarios:

  1. Gradual growth. You finish March 2026 with £91k turnover for the year ending March 2026. You must register by 30 April 2026, with effective registration date 1 May 2026.
  2. One-off large job. You normally do £60k/year but win a £40k extension contract that pushes you to £100k. Same rule — once the rolling 12 months crosses £90k, register within 30 days.

Forward-looking test: if you know you'll cross the threshold in the next 30 days alone (e.g. you've just signed a £100k contract starting next month), you must register immediately, with effective date the day you knew.

Failure to register on time results in penalties (10–15% of VAT due, increasing with delay) plus interest on the unpaid VAT.

Should I register voluntarily?

Below £90k turnover, registration is optional. Voluntary registration helps you if:

Voluntary registration hurts you if:

For most domestic-focused trades (general builders, plumbers, electricians, decorators), the right answer is to stay below the threshold for as long as possible and only register when forced. The 20% price disadvantage when you cross the threshold is significant — many sole traders deliberately cap turnover at £85–88k to stay below.

The "threshold trap" and how to manage it

The hard threshold creates a perverse incentive: a sole trader at £85k turnover faces a choice between staying below £90k (no VAT) or growing to (say) £110k (where you pay £22k VAT on £110k of sales, partially offset by reclaiming input VAT on (say) £40k of materials = £8k input VAT, so net £14k VAT bill). The economic cost of the threshold is significant.

Practical approaches:

  1. Stay below by spreading customers — bring in a junior trade or work fewer days; cap turnover deliberately
  2. Cross the threshold cleanly — accept the 12-month transition pain, increase prices to absorb VAT, win bigger and commercial customers who can reclaim
  3. Form a limited company and split — only works if there are genuinely separate businesses; HMRC's "disaggregation" rules treat artificially split businesses as one VAT entity. Get accountant advice.
  4. Subcontract — pay your work out to subcontractors so their turnover doesn't appear in yours (must be genuine subcontractor relationship)

Standard rate (20%), reduced rate (5%), zero rate (0%)

Most domestic repair, maintenance, improvement and new-build kitchen/bathroom work is 20% standard rate. The exceptions:

5% reduced rate (under VAT Notice 708/6 "Energy-Saving Materials" — ESM list):

The 5% rate applies to the installation including labour and materials — provided the installation is in a residential building or charity-occupied building. You need evidence: the materials supplied and installed must be on the ESM list, and the installation must be at a qualifying property.

0% zero rate:

Zero rate is hugely advantageous if you do new build — you charge no VAT, but you reclaim all the input VAT on materials. Effectively, the customer pays £100k for a job that cost you £80k inc VAT (you reclaim the input VAT = £80k - £16k = £64k net cost), leaving £36k margin. Get the paperwork right (RICS appraisal, planning consent, evidence of "new build") because HMRC audits zero-rated work carefully.

Construction Industry Domestic Reverse Charge (DRC) — from March 2021

The DRC fundamentally changed B2B construction VAT. Before March 2021, a VAT-registered subcontractor would charge VAT on labour and materials to the main contractor; the main contractor would reclaim the VAT through their input VAT. HMRC's experience was that the system was widely abused — a "missing trader" would charge VAT, collect it, and disappear without paying it to HMRC, while the contractor still claimed the input VAT recovery. DRC eliminates the abuse by moving the VAT accounting to the customer.

DRC applies when ALL of:

  1. The supply is a construction service under the CIS (Construction Industry Scheme) list of qualifying activities
  2. The customer is VAT-registered AND CIS-registered (i.e. a contractor who's registered for CIS)
  3. The customer is not an "end user" or "intermediary supplier"
  4. The supply is standard rate or reduced rate (zero-rated supplies are unaffected)

Practical effect: you (subcontractor) invoice for the work but charge no VAT. Your invoice says "Reverse Charge — customer to account for VAT". The main contractor accounts for VAT on the supply themselves (both output and input on their VAT return — usually net zero impact).

Common DRC traps:

Cash flow effect: subcontractors lose the "VAT cash cushion" they used to enjoy. Under traditional accounting, a subcontractor charged VAT, collected it from the contractor, and held it for 1–3 months before paying HMRC. Under DRC, no VAT is collected — cash flow is materially worse. Many small subcontractors found this painful in 2021 and some applied for the Cash Accounting Scheme to mitigate.

Flat Rate Scheme — is it worth it?

The Flat Rate Scheme (FRS) lets small businesses (turnover under £150k) pay HMRC a fixed percentage of gross sales instead of calculating output minus input VAT. The percentages by trade:

The flat rate is applied to your gross sales including VAT — so the effective rate on net sales is higher. A 9.5% flat rate is equivalent to 11.4% of net sales.

FRS is worse than normal accounting for most tradespeople because:

FRS makes sense for:

For most building tradespeople, stay on normal VAT accounting and reclaim your input VAT properly. Test on a year's actual figures before deciding.

Cash Accounting Scheme

Under standard VAT accounting, you owe HMRC output VAT on the invoice date even if the customer hasn't paid yet — a real cash flow problem if customers are 60–90 days late.

Cash Accounting Scheme (CAS) lets you pay output VAT only when the customer pays you, and reclaim input VAT only when you pay your supplier.

Eligibility: turnover under £1.35m (entering); under £1.6m (continuing).

Pros: removes the cash flow gap between invoicing and payment. Particularly helpful for tradespeople with slow-paying commercial customers.

Cons: input VAT recovery is also deferred (you don't recover VAT on materials until you've paid the supplier). For tradespeople paying suppliers on 30-day account but waiting 60–90 days for customer payment, CAS is usually a clear win.

Making Tax Digital (MTD) for VAT

Since April 2022, all VAT-registered businesses must file VAT returns via MTD-compatible software. No more spreadsheet-and-HMRC-website filing.

Compatible software:

Records must be kept digitally — the days of paper invoices in a shoebox passed in 2022. Photo-and-upload is acceptable if the resulting data is digitally captured.

Choosing an accountant

For VAT-registered tradespeople, an accountant is typically essential — not optional. Cost: £1,200–£2,500/year for a sole trader with VAT, CIS and self-assessment; £1,500–£3,500/year for a limited company.

What an accountant should do:

What a good accountant should ask you:

Don't pay for "tax planning" that's just a discount on the accountant's fee. Pay for genuine advice tailored to your business.

Frequently Asked Questions

What counts towards the £90k threshold?

All taxable supplies in the UK — standard rate, reduced rate, zero rate. Outside the threshold: exempt supplies (e.g. financial services), supplies that are outside UK scope (e.g. work in another country), and capital asset sales (one-off, not your normal trading).

For a typical tradesperson: all your labour and materials charged to customers, including any small jobs paid in cash. HMRC will reconcile against bank deposits.

If I'm just under £90k, can I avoid VAT by stopping work?

Yes — many sole traders deliberately stop taking work in the last few weeks of their 12-month rolling period to stay below. Legitimate as long as it's not artificial structuring. "Disaggregation" (splitting into separate businesses to stay below threshold) is challenged by HMRC if the businesses are not genuinely separate.

Do I need to charge VAT on a domestic customer if I'm not registered?

No. Below the threshold and not registered, you charge no VAT and reclaim no input VAT. Your invoices simply quote the gross price; no VAT line.

How do I work out if I should register voluntarily?

Calculate:

  1. Your expected annual gross sales
  2. Your expected annual input VAT recoverable (materials, fuel, tools, business overheads × 20/120)
  3. The proportion of your customers who can reclaim VAT (other VAT-registered businesses)

If most of your customers can reclaim, voluntary registration is roughly neutral to you and lets you recover input VAT — net benefit positive. If most are domestic, voluntary registration costs you 20% on prices to recover input VAT — usually negative.

A useful rule of thumb: voluntary registration is positive when expected input VAT recoverable per year exceeds 25–30% of expected output VAT — and your customer mix favours VAT-recoverable customers.

My customer asks me to "leave the VAT off" so they don't have to pay it. What do I do?

If you're VAT-registered: you must charge VAT on the work, regardless of customer preference. Not charging VAT when you should is tax evasion — penalties up to 100% of the unpaid VAT plus criminal prosecution in serious cases. If the customer is VAT-registered, they can reclaim the VAT on their own return — point them to that.

If you're not registered: you don't charge VAT, but it's because you genuinely don't owe it — not as a discount.

Do I charge VAT on the materials a customer buys directly?

If the customer buys materials directly (e.g. from B&Q in their name), you don't supply those materials — you only supply labour. VAT on the materials is on the customer's purchase and they paid VAT to the merchant. You charge VAT on your labour only (if registered).

If you buy materials in your name and then "on-sell" them to the customer (with or without mark-up), VAT applies to the full supply at the rate applicable to the type of work.

Can I reclaim VAT on my van?

Yes if VAT-registered, but with rules:

For purchase of a new commercial van, the input VAT recovery is significant (£3,000–£5,000 saving on a £15,000–£25,000 van) — a reason for voluntary registration if you're planning a vehicle upgrade.

Regulations & Standards