For years, the Basic Payment Scheme cheque was the line in the accounts you could count on. That certainty has now gone. In 2026, delinked payments have been cut by 98%, the SFI26 replacement opens in rationed windows that can shut early, and Defra’s own figures say 42% of farms are unprofitable without the old support.
This guide makes the case for barn-roof solar as the one source of farm income nobody in Whitehall can cut, shows you how to size a system to plug the exact hole in your accounts, and flags the inheritance tax trap that separates a roof array from a field lease. By the end, you will know whether your shed roof is the most dependable money left on the holding.
- Delinked BPS payments have been cut by 98% in 2026. A reference amount of £30,000 now pays a maximum of £600, down from roughly £7,200 the year before. 2027 is the last year of delinked payments, then it stops entirely.
- SFI26 is rationed, not guaranteed. Window 1 opens in June 2026 for small farms and those without an existing agreement, Window 2 in September 2026 for everyone. Both run on a controlled budget that can close early, and agreements are capped at £100,000 a year.
- Barn-roof solar cannot be cut by government. A 35-50kW array on a high-daytime-load farm can save roughly £7,200 a year at commercial electricity prices of 25-30p per kWh, the equivalent of one old BPS cheque.
- Solar saves a cost rather than earning taxable income. Money you do not spend on electricity is not taxed as income, unlike your delinked payment, which is.
- Roof and field are not the same for tax. A roof array for your own use generally keeps the building in agricultural and trading use. Leasing a field to a solar developer can strip that land of Agricultural Property Relief and expose it to the new April 2026 cap. Take any field offer to an agricultural tax adviser first.
The hole in the accounts
The Basic Payment Scheme used to underpin the farm. It arrived every year, no application required, and for many holdings it was the difference between profit and loss. That money is now all but gone.
For 2026, the Rural Payments Agency applies a 98% reduction to the first £30,000 of your reference amount, and a 100% reduction to anything above it. In plain terms, a farm with a £30,000 reference amount receives a maximum delinked payment of £600 this year, against roughly £7,200 the year before. Then it gets worse: 2027 is the last year of delinked payments, after which the cheque stops completely.
The replacement is meant to be the Sustainable Farming Incentive, but SFI26 does not work like the old scheme. There are two application windows. Window 1 opens in June 2026 for small farms (up to 50 hectares) and farms without an existing Environmental Land Management revenue agreement. Window 2 opens in September 2026 for everyone else. Both run on a controlled budget, and the government has been clear that Window 1 may close sooner if demand is high and its budget is fully allocated. Agreements are capped at £100,000 per business per year.
So the safety net has changed shape. You now have to apply, in a fixed window, for a pot of money that can run dry before you get to it. Defra’s own assessment is that 42% of farms are unprofitable without the old BPS support. That is the hole this article is about, and your barn roof is one of the few things that can fill it on terms you control.
BPS 98% cut, SFI26 windows and the Defra 42% figure fact-checked 28 Jun 2026 (Defra / RPA / GOV.UK)The one income line nobody can cut
Here is the core idea, and it is worth slowing down for. A subsidy is income someone chooses to give you. Solar is a cost you delete. Once the panels are on the roof, the electricity they make is electricity you do not buy, and no minister can vote to take that away.
That distinction matters more than any headline payback figure. Commercial electricity costs farms roughly 25-30p per kWh in 2026, and that is the price your own generation displaces. Every unit your panels produce and you use on-site is a unit you are not paying the grid for. The saving lands in your accounts whether or not a scheme is open, whether or not a budget is full, and whether or not the rules change again next autumn.
The table below is the heart of the case. It sets the old subsidy model against barn-roof solar on the things that actually decide whether money is dependable.
| Factor | BPS / SFI26 | Barn-roof solar |
|---|---|---|
| Can the government cut it? | Yes, and just did (98% cut in 2026) | No |
| Do you need to apply? | Yes, in a fixed window | No |
| Is there a budget cap? | Yes, the pot can close early | No |
| What is it, in tax terms? | Taxable income | A cost you delete, not taxed as income |
| How long is it guaranteed? | Ends in 2027 | Effectively 30 years (panel lifespan) |
Read that last column on its own and the point lands. The roof needs no form, sits under no budget, answers to no reduction percentage, and keeps working for around three decades. It is the only line in the farm accounts that nobody in Whitehall can touch.
Size it to the hole, not the roof
The instinct with solar is to fill every square metre of south-facing steel you own. Resist it. The aim is not to cover the roof, it is to cover the hole the BPS cheque left, and to do that you size the system to your daytime electricity use, not your available roof space.
Solar only saves you money when you use the power as it is generated. A unit you produce at noon and use at noon saves you the full 25-30p. A unit you export to the grid earns you a Smart Export Guarantee payment of only a few pence. So the value of an array depends almost entirely on how much electricity your farm draws during daylight hours. A dairy with milking and cooling running all day is a near-perfect match. A beef farm with low daytime demand is not.
A well-matched system on a high-daytime-load farm sits in the 35-50kW range, and at UK output that produces roughly 33,000 to 47,000 kWh a year. Used on-site at commercial prices, that is where the £7,200 figure comes from: one old BPS cheque, replaced by your roof. Below are three worked examples, framed in the only unit that matters here.
Dairy farm: 1 to 1.5 BPS cheques replaced
Dairies are the strongest case for barn-roof solar in the country. Milking machines, vacuum pumps, plate coolers and bulk tank refrigeration all run hard through the day, exactly when the panels are producing. A 40-50kW array on a parlour or cubicle-shed roof can routinely cover a large share of that daytime load, saving in the region of £7,000 to £10,000 a year. For many dairies that is one full BPS cheque replaced, and then some.
Pig and poultry: 1 BPS cheque replaced
Intensive livestock buildings run ventilation fans, lighting and heating around the clock, with a strong daytime peak. The load is steady and predictable, which is ideal for solar. A 35-45kW array typically saves £6,000 to £8,500 a year, putting it squarely at one old BPS cheque. The high baseload also means very little is wasted to export.
Arable with a grain store: half a cheque, timed well
Arable is more seasonal. The big draw is grain drying and handling at harvest, which happens to land in the sunniest months. A 35-40kW array on a grain store roof might save £3,500 to £6,000 a year depending on how much drying you do. That is half to most of a BPS cheque, with the bonus that your peak generation and peak demand arrive together in late summer.
The honest caveat across all three: these figures assume you use most of the power on-site. If your daytime demand is low, a smaller array sized to your baseload will pay back far better than a big one exporting cheap units to the grid. Get an installer to look at your actual half-hourly electricity data before settling on a size.
Stack it, don’t swap it
A common worry is that putting solar on the roof somehow rules you out of other support. It does not. Barn-roof solar runs alongside the rest of the farm funding landscape, it does not replace it. The smart play is to stack every benefit you can.
- SFI26: solar on your own roof for your own use has nothing to do with your land-based SFI actions. You can still apply in Window 1 or Window 2 and run an agreement worth up to £100,000 a year.
- Capital grants such as the Farming Equipment and Technology Fund: these fund specific productivity items. Solar generation typically sits outside them, but installing panels does not affect your eligibility for grant-funded kit elsewhere on the holding. Watch for future rounds and check the current item list when one opens.
- 100% first-year tax relief (Annual Investment Allowance): this is the big one. Solar panels on a building you own usually qualify for the Annual Investment Allowance, which lets you write off the full cost of the installation against your taxable profits in the year you buy it. On a £35,000 system, a business paying tax can recover a meaningful slice of the cost almost immediately.
The combined effect is that you keep your existing and future scheme income, claim full tax relief on the capital outlay, and add a 30-year electricity saving on top. That is stacking, not swapping.
The roof versus field tax warning
This is the section to read twice, because it is where farmers can make an expensive mistake. Solar on your barn roof and solar in your field are treated very differently for inheritance tax, and the gap matters more than ever from April 2026.
Start with the rule change. From 6 April 2026, 100% Agricultural Property Relief (APR) and Business Property Relief (BPR) are capped at £2.5 million per individual (transferable between spouses, so up to £5 million for a couple). Above that cap, inheritance tax applies at an effective rate of 20% on qualifying agricultural and business property. For a farm of any scale, that cap is now a live planning issue rather than a distant one.
APR/BPR £2.5m cap from 6 Apr 2026 (20% effective rate) fact-checked 28 Jun 2026 (HMRC)Here is why the roof and the field part company.
Generates power for the trading farm business. The building stays in agricultural and trading use, so it generally continues to qualify for relief in the normal way. You are not changing the character of the asset, you are cutting its running cost.
That land typically stops being used for agriculture and becomes a let investment generating rent. It can lose its APR, be reclassified as an investment rather than a trading asset, and fall inside the new £2.5 million cap. A field that was once fully relieved could become a 20% inheritance tax liability.
The numbers on a field lease can look tempting, and for some holdings they genuinely work. But the tax consequences are specific to your business structure, your existing asset values and how close you already are to the cap. Take any field-array offer to an agricultural tax adviser before you sign anything. A barn roof for your own use carries far less of this risk, which is another reason it is the simpler, safer place to start.
This article is for general information only and does not constitute tax or legal advice. The treatment of solar for APR, BPR and other taxes depends on your individual circumstances, and you should take professional advice specific to your business before acting.
Frequently asked questions
How much can barn-roof solar save a UK farm in 2026?
A 35-50kW array on a high-daytime-load farm can save roughly £7,200 a year, the equivalent of one old Basic Payment Scheme cheque, at commercial electricity prices of 25-30p per kWh. The exact figure depends on how much of the power you use on-site. Dairies and intensive livestock units, which draw heavily during daylight, save the most.
Is barn-roof solar better than the SFI26 scheme?
They do different jobs and you can have both. SFI26 pays you for land management actions but runs on a rationed budget, opens only in fixed windows in June and September 2026, and can close early. Barn-roof solar cannot be cut, needs no application, and saves a cost for around 30 years. The strongest position is to claim SFI26 and install solar, not choose between them.
Why is solar treated as a saving rather than income?
Solar generates electricity you would otherwise buy from the grid, so it reduces a cost rather than paying you money. A cost you avoid is not taxed as income, whereas your delinked BPS payment is taxed as income. This is a quiet but real advantage, because every pound saved on electricity is worth more after tax than a pound of subsidy.
Will putting solar on my barn affect my inheritance tax position?
A roof array for your own farm’s use generally keeps the building in agricultural and trading use, so it usually continues to qualify for relief in the normal way. The risk lies with leasing a field to a solar developer, which can cause that land to lose Agricultural Property Relief and fall inside the new £2.5 million cap that applies from 6 April 2026. Always take a field-array offer to an agricultural tax adviser first.
Can I claim tax relief on the cost of a farm solar installation?
Yes, in most cases. Solar panels on a building you own usually qualify for the Annual Investment Allowance, which lets a tax-paying business write off the full cost of the installation against its profits in the year of purchase. This sits on top of any electricity savings and does not affect your eligibility for SFI26 or capital grant schemes.
How do I size a solar array for my farm?
Size it to your daytime electricity use, not your roof area. Solar only saves money when you use the power as it is generated, so the value depends on how much your farm draws during daylight. Pull your half-hourly consumption data and ask an installer to match the array to your daytime load, rather than simply filling the roof with panels.
Strip away the politics and the picture is simple. The BPS cheque is being switched off, SFI26 is a rationed pot you have to queue for, and 42% of farms do not work without the old support. Against that, a barn-roof solar array is income nobody can cut, needs no application, sits under no budget cap, saves a cost rather than earning taxable income, and keeps doing it for around 30 years.
For high-daytime-load farms – dairies, pig and poultry units, and arable holdings with grain drying – barn-roof solar is the most reliable money you can put on the farm in 2026. It will not suit everyone. If your daytime demand is genuinely low, the sums are weaker, and a field lease may look more attractive on paper, but only once you have weighed the inheritance tax cost with an adviser.
Your next step is straightforward. Pull your half-hourly electricity data, then get three quotes from MCS-certified commercial installers, and ask each to size the array to your daytime load and show you the saving in BPS cheques replaced, not just pounds per kWp.
This article was fact-checked on 28 June 2026. Seven main facts were verified: the 98% cut to delinked payments (£600 maximum versus £7,200, ending after 2027); the SFI26 two-window structure (June and September 2026), its £100,000 cap and the risk of early closure; the Defra figure that 42% of farms are unprofitable without BPS support; commercial farm electricity prices of 25-30p per kWh; the Annual Investment Allowance treatment of solar; and the £2.5 million APR/BPR cap with a 20% effective rate from 6 April 2026. Sources included GOV.UK, Defra and the RPA, HMRC, and the House of Commons Library.
Scheme rules, tax thresholds and energy prices change, and tax treatment depends on your circumstances – confirm current figures and take professional advice before acting.
