Flat Rate vs Standard VAT Calculator
Enter your farm's rough annual sales and purchase figures. This estimates what the Agricultural Flat Rate Scheme would keep you against what standard VAT registration would let you reclaim, so you know which conversation to have with your accountant.
Feed, fuel, vet bills, contracting, machinery, anything you'd normally pay VAT on.
Enter both figures above to compare the two schemes.
Under the Agricultural Flat Rate Scheme (AFRS), you may add 4% to sales to VAT-registered buyers and keep the whole addition, with no VAT return required. You cannot add it to sales to people who are not VAT-registered, to other flat rate farmers, or to machinery and land. Under standard VAT registration, you charge and reclaim VAT normally. Whichever gives you the bigger number, the 4% addition or the input VAT you'd reclaim, points toward the better-value scheme for those figures.
How does this estimate work?
The calculator multiplies your annual sales to VAT-registered buyers by 4%, the current AFRS addition, to estimate what you'd keep under the flat rate scheme. It multiplies your annual VAT-bearing purchases by 20% to estimate the input VAT you could reclaim under standard registration. Whichever total is larger is the direction the numbers point.
Run this again after a year with a big capital purchase, a new shed, a replacement tractor, on its own. A single large purchase can flip the answer even if the scheme made sense for years beforehand.
Why is this an estimate, not an answer?
Two simplifications matter here. Not every farm input sits at the standard 20% VAT rate, some are zero-rated or reduced-rated, so your real reclaimable input VAT may be lower than this tool assumes. And the 4% addition only applies to sales made to VAT-registered buyers, if a meaningful share of your sales go direct to the public, the real AFRS benefit is smaller than the full sales figure suggests. Treat the result as a starting point for the conversation, not the final word, the guide itself is explicit that this is a numbers question worth working through properly with an accountant.
Where can you read the full rule?
For how AFRS actually works, what it replaces, and how it interacts with Making Tax Digital, see the Flat Rate Scheme guide.
The numbers, tracked as you go
FarmHQ codes every receipt to VAT automatically, so the real comparison between AFRS and standard registration is sitting in your actual records rather than a rough annual estimate typed in once a year.
See how FarmHQ worksWhat does a worked example look like, line by line?
Everything below is an illustration with made-up figures, not a real farm and not advice. A livestock farm sells £120,000 of cattle and lambs: £100,000 to VAT-registered buyers, £20,000 to others. It buys £60,000 of things carrying 20% VAT (vet, fuel, repairs, contractors) and £30,000 of feed. Live animals for food and most feed are zero-rated.
- Flat rate scheme: 4% of £100,000 is £4,000. The £20,000 earns no addition, because HMRC says you must not charge the addition on sales to people who are not VAT-registered.
- Standard registration: 20% of £60,000 is £12,000 of input VAT reclaimed. Sales are zero-rated, so there is no output VAT to set against it, and the feed carries no VAT to reclaim.
- Difference: £12,000 minus £4,000 is £8,000 in favour of registering, before the time returns take.
Entering all £120,000 as sales would show £4,800 and flatter the scheme by £800, so enter only sales to VAT-registered buyers. Because 4% is a fifth of 20%, the two come out level when VAT-bearing purchases equal a fifth of those sales, here £20,000. At £15,000 of purchases you would reclaim £3,000 against £4,000, so the scheme keeps more.
Who can join the flat rate scheme, and who cannot?
The conditions are in HMRC's Notice 700/46. To join, farming turnover must be under £150,000, and you can stay until it goes over £230,000. Non-farming turnover, such as holiday lets or bed and breakfast, must be below the VAT registration threshold, which GOV.UK puts at £90,000.
You cannot join if you mainly buy and sell animals, or process other people's produce, such as dairy co-operatives that buy members' milk and make products. Riding lessons and pony trekking are also outside it. Even if you qualify you do not have to join. You apply on form VAT98, and the certificate takes effect from the date HMRC receives it. Allow up to three weeks. Our flat rate scheme guide covers the choice.
How does the 4% addition work on an invoice?
The addition is not VAT. HMRC says you may add 4% to sales of qualifying goods to VAT-registered customers, even where the sale would be zero-rated, and you keep it. You do not have to add it. You must not add it to sales to people who are not VAT-registered, to other flat rate farmers, or on sales of machinery or land. You file no VAT returns.
Invoices must show your flat rate certificate number, the price excluding the addition, and the rate and amount of the addition. For example, £10,000 of cattle sold to a VAT-registered buyer is invoiced at £10,000 plus £400, a total of £10,400. The buyer treats the £400 as input tax. Keep copies for 6 years. Sales through a mart depend on whether the auctioneer buys and sells in their own name, so ask the livestock markets and auctioneers you use how they want it handled. See our farm invoice requirements guide.
What happens if you leave the scheme?
The notice says you must leave if farming turnover goes over £230,000 for the year, or over £230,000 for the prior 30-day period at the end of any month. You must also leave if non-farming sales pass the registration threshold, if you stop producing qualifying goods, or if you sell the business or change from sole trader to company. Tell HMRC in writing within 30 days of the certification anniversary when you become ineligible. To leave by choice you must have been in the scheme at least a year.Leaving usually means registering for VAT, with returns and Making Tax Digital software; our farm VAT registration threshold guide covers when. Rejoining is restricted: if you registered after leaving, you can rejoin only after 3 years, or after 1 year if the tax due on assets on hand is under £1,000. On registering, HMRC's general VAT guide lets you treat VAT on goods bought up to 4 years earlier and still held, and on services from the last 6 months, as input tax, subject to conditions. Ask your accountant first.
What do farmers actually ask?
How does this calculator compare the two schemes?
It multiplies your annual sales to VAT-registered buyers by the current 4% AFRS addition to estimate what you would keep under the flat rate scheme, and multiplies your annual VAT-bearing purchases by 20% to estimate the input VAT you could reclaim under standard registration. Whichever figure is bigger points toward the better-value scheme for those numbers.
Is the result exact?
No, it is an estimate. It assumes all your VAT-bearing purchases sit at the standard 20% rate, when in reality some farm inputs are zero-rated or reduced-rated, and it assumes all your sales go to VAT-registered buyers. Treat the result as a starting point for a conversation with your accountant, not a final answer.
What is the current AFRS flat rate addition?
4%, as of the current guidance, though HMRC reviews this figure periodically. Always check GOV.UK for the rate in force before relying on it.
Do I have to register for VAT if nearly all my sales are zero-rated?
Zero-rated sales still count towards the £90,000 threshold. HMRC allows you to apply for exemption from registration if all or most of your supplies are zero-rated, but if it is granted you cannot reclaim input tax. A farm with heavy standard-rated spending often does better registered. Our farm VAT registration threshold guide sets out the tests.
Does farming turnover over £90,000 force me off the flat rate scheme?
HMRC's notice tests farming turnover against £230,000 and non-farming turnover against the registration threshold. It does not name £90,000 of farming sales as a trigger. Confirm your own position with HMRC or your accountant, especially if you have lets or other non-farming income.
Can I reclaim VAT on a new tractor while on the flat rate scheme?
No. A flat rate farmer cannot reclaim input tax, and the addition only compensates for that loss. Re-run the numbers before any big purchase. Income tax relief on machinery is a separate matter, covered in our farm expenses and capital allowances guide.