Three businesses with identical turnover can pay materially different amounts of VAT depending on which scheme they elect. The differences are not small. We recently moved a marketing consultancy off the Flat Rate Scheme and saved them £4,800 a year — pure margin, no operational change. The opposite has happened too: clients who joined Flat Rate without modelling it properly and overpaid quietly for years.
Here is a clear-headed guide to picking the right scheme, and the trigger points to switch.
The three schemes that matter for SMEs
Standard VAT Accounting
You charge 20% (or the relevant rate) on outputs, you reclaim VAT on inputs, you pay the difference quarterly. This is the default. It is administratively heavier but mathematically neutral — you only ever owe HMRC the genuine VAT on your value added.
Flat Rate Scheme (FRS)
Designed for simplicity. You charge customers 20% as usual but pay HMRC a flat percentage of your gross (VAT-inclusive) turnover — between 4% and 16.5% depending on trade. You generally cannot reclaim input VAT, except on capital purchases over £2,000.
The catch — and it is a big one — is the "limited cost trader" rule. If your business spends less than 2% of turnover (or less than £1,000 a year) on relevant goods, you pay 16.5% flat. After the 1% first-year discount that is 15.5%. On a VAT-inclusive turnover of £100,000 you remit £16,500 — but you only collected £20,000 of output VAT. The maths only works if your trade-specific flat rate is genuinely low and you have minimal input VAT to reclaim.
Cash Accounting Scheme
You account for VAT on the date money moves, not on the invoice date. This is gold for businesses with slow-paying customers because you never fund HMRC's share of an invoice your customer has not paid you for. Available up to £1.35m turnover.
How to choose: the decision framework
- Calculate your input VAT ratio. Total reclaimable input VAT divided by total output VAT for the last 12 months. If it is above 25%, Standard almost always wins. If it is below 10%, FRS is worth modelling carefully.
- Test the limited cost trader rule. Add up your spend on relevant goods (excluding services, food consumed by you, vehicles, and capital items). If it is under 2% of turnover, you are stuck on 16.5% — FRS is almost certainly bad value.
- Look at debtor days. If your customers pay 60+ days late, Cash Accounting on top of Standard is a cashflow lifesaver — you can combine the two.
- Project capital expenditure. Planning a major equipment purchase? Standard lets you reclaim 100% of the input VAT in full. FRS only lets you reclaim on single items over £2,000.
Worked example
Consultancy turning over £80,000 net (£96,000 gross). Inputs are £4,000 net (£800 input VAT) — mostly software and a laptop.
- Standard: Owes £16,000 output VAT minus £800 input VAT = £15,200.
- FRS at 14.5% (management consultancy): £96,000 × 14.5% = £13,920. Saving of £1,280.
- FRS at 16.5% (limited cost trader): £96,000 × 16.5% = £15,840. Loss of £640.
That £1,280 swing depends entirely on whether the consultancy buys £1,920 of "relevant goods" each year. Stationery, hardware, and printed marketing count. Software, accountancy fees, and travel do not. The detail matters.
Common mistakes we see
- Staying on FRS after growth. A business that started service-only and added physical product sales should re-test the limited cost trader rule annually. Many do not.
- Confusing zero-rated and exempt supplies when calculating the FRS percentage. Zero-rated turnover is included; exempt is not.
- Missing the first-year 1% discount. If you registered in the last 12 months, you get a 1% reduction on whichever FRS rate applies. Worth claiming.
- Forgetting the £230,000 anti-forestalling rule when leaving FRS — there are conditions on rejoining.
When to review your scheme
Re-run the analysis whenever:
- Turnover changes by more than 20% in either direction
- You take on a major new supplier or shift cost mix
- Customer payment terms shift
- HMRC updates the relevant percentages — review the published rates annually
Want us to model it?
We run scheme comparisons as a standard part of our VAT compliance service. Send us your last 12 months of accounts and we will tell you which scheme is correct, by how much, and how to switch without triggering anti-avoidance flags. Or jump straight to booking a VAT review.