The VAT Flat Rate Scheme (FRS) was built for small businesses that find normal VAT accounting a burden: instead of tracking VAT on every sale and purchase, you pay HMRC a fixed percentage of your gross turnover. For businesses classified under "repairing vehicles", the flat rate is 8.5% — one of the lowest rates in the table. Done right, a small garage can keep a meaningful slice of the VAT it charges. Done wrong, the limited cost trader rule flips the rate to 16.5% and you'd be better off on normal VAT. Let's work through both.
How the Scheme Works
On the FRS you still charge your customers 20% VAT as normal. But instead of paying HMRC the VAT charged minus the VAT reclaimed, you simply pay a flat percentage of your VAT-inclusive turnover. In exchange, you give up the right to reclaim input VAT on most purchases (with one exception: capital assets costing over £2,000 including VAT — a vehicle lift or diagnostic machine, for example).
A Worked Example at 8.5%
| Item | Normal VAT | Flat Rate (8.5%) |
|---|---|---|
| Labour + parts billed (net) | £80,000 | £80,000 |
| VAT charged to customers | £16,000 | £16,000 |
| Input VAT on parts/costs (say £30,000 net) | −£6,000 | not reclaimable |
| Paid to HMRC | £10,000 | 8.5% × £96,000 = £8,160 |
| Better off by | — | £1,840 |
The picture reverses as your parts bill grows: a garage spending heavily on parts, consumables and oil reclaims more under normal VAT than it saves on the flat rate. Run the numbers both ways before joining — or use our VAT calculator as a starting point.
Eligibility and Thresholds
- You can join if you expect taxable turnover of £150,000 or less (excluding VAT) in the next 12 months
- You must leave once total income exceeds £230,000 (including VAT)
- There's a 1% discount on your rate in your first year of VAT registration — so 7.5% for a newly registered garage
Full rules are in VAT Notice 733 and the overview at gov.uk/vat-flat-rate-scheme.
The Limited Cost Trader Trap — 16.5%
Since 2017, you must check every VAT period whether you're a "limited cost trader". You are one if your spending on goods is less than:
- 2% of your VAT-inclusive turnover, or
- £1,000 a year (£250 a quarter), even if above 2%
If you're caught, your rate for that period is 16.5% — which on VAT-inclusive turnover means handing over almost all the VAT you charged, while still being unable to reclaim input VAT. For a limited cost trader the FRS is nearly always a bad deal.
Crucially, "goods" excludes capital equipment, fuel for vehicles (unless you're a transport business), food, and services — software subscriptions, insurance, rent and subcontract labour don't count. A parts-buying garage will normally clear the 2% test comfortably. A mobile mechanic who mostly supplies labour, with customers buying their own parts, can fail it — and that's exactly who should check before joining.
Flat Rate and the Margin Scheme Don't Mix
One critical interaction for garages: you cannot use the margin scheme for used vehicle sales while on the Flat Rate Scheme — the FRS percentage applies to your full turnover, including the entire selling price of vehicles. If used car sales are part of your business, the margin scheme on normal VAT accounting will almost always beat the FRS. Similarly, MOT fees handled correctly as outside the scope stay outside the FRS calculation — but only if invoiced properly.
The Decision in Short
- Labour-heavy garage, modest parts spend, no car sales → FRS at 8.5% is often a winner
- Heavy parts spend → normal VAT accounting usually reclaims more
- Mobile mechanic supplying mostly labour → check the limited cost trader test first
- Selling used cars → stay off the FRS; use the margin scheme
At SMD Accountancy we run this comparison with real numbers from your last 12 months before recommending a scheme — and we review it every year, because the right answer changes as your business does. Book a free 20-minute call and we'll tell you which scheme keeps more money in your garage.