Synoria AI CorporationAutonomous software company
Accounting & Finance

The Flat Rate Applies to the Gross

Under a VAT flat rate scheme the percentage is charged on VAT-INCLUSIVE turnover, and that is not the figure most people put it against. On 100,000 of net turnover the gross is 120,000, so 12% is 14,400 — not the 12,000 that the same percentage produces on the net. Nothing fails, no rate is wrong, and the return is simply short by 2,400 every time it is done that way. The scheme is also not automatically cheaper: input VAT is not reclaimed, so it wins only while the input VAT given up is smaller than the output VAT saved, and the break-even is exact — 20,000 of output VAT less 14,400 payable = 5,600. Below it the scheme is worth money; above it, it costs money. And the goods test can remove the point entirely: a business whose spending on goods falls below the higher of 2% of gross turnover and 1,000 pays the limited cost rate on its WHOLE turnover, which at 16.5% is 19,800 of the 20,000 charged — 200 kept, against input VAT that still cannot be reclaimed. The test is on goods, not on costs.

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Accounting & Finance

Small UK businesses on, or considering, the VAT flat rate scheme, and the bookkeepers who have to show why the payable figure is what it is.

How it works

  1. Enter your net turnover, the VAT rate you charge and your trade's flat rate.
  2. Read the payable figure against what the same percentage gives on the net — that difference is the usual error.
  3. Enter the input VAT you would have reclaimed and compare the two schemes against the break-even.
  4. Enter your spending on goods to see which side of the goods test you are on, and by how much.

What you gain

  • Tells you the exact point of input VAT at which the UK flat rate scheme stops paying off, comparing both schemes on your own turnover instead of a rule of thumb.

Screenshot

The Flat Rate Applies to the Gross

Technical details

Standard57.99 USD · 1500 requests · 31-day license · one-time payment · 31-day access
Pro115.98 USD · 6000 requests · 31-day license · one-time payment · 31-day access
Isolationdedicated instance per license
Usage meteringLLM usage metered per license
Accessweb sign-in with license key

How to set up & use

  1. Buy the license — your key (lic_...) appears on the order page and in your email.
  2. Sign in at app.synoriaai.com with your license key.
  3. No installation — the product runs in your browser, on your own isolated instance.
  4. 1. Enter your VAT-inclusive turnover and the VAT rate.
  5. 2. Enter the flat rate percentage for your trade, and choose whether this is your first year of VAT registration.
  6. 3. Click 'Calculate' to see the flat rate payable on the gross amount, alongside what the same percentage would give on the net figure, and the difference between them.
  7. 4. Enter your input VAT (VAT you can reclaim) to see the break-even point where the flat rate scheme stops being beneficial compared to standard VAT accounting.
  8. 5. Review the results, including the goods test check and the self-check that VAT charged equals VAT paid over plus VAT kept.

Frequently asked questions

Does this tool store my turnover or VAT figures?

No. All calculations happen in your browser. We do not save or transmit any of the numbers you enter.

What does the 'goods test' do?

It checks if you spend enough on goods (as a percentage of gross turnover) to stay on your current flat rate. If you fall below the threshold, the tool shows how far short you are, because that would move your entire turnover to the higher limited cost rate.

Does this tool give me tax advice or guarantee my VAT return is correct?

No. It performs arithmetic based on the rates and figures you enter. It does not account for every possible rule or edge case. Always confirm with HMRC or a qualified accountant before submitting your return.

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Each plan includes a fixed number of requests for the license period. A small overage allowance is defined beyond that; once it is used up, requests pause until a new license is purchased.
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Each product is built for its target market and uses that market's language; this storefront is available in 9 languages.

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