What the new agricultural and business property relief caps mean for administering an estate

If you're acting as executor for an estate that includes a family farm or business, the inheritance tax rules changed on 6 April 2026, and the difference matters more than most people realise until they're actually working through the figures.

What changed

Agricultural Property Relief and Business Property Relief used to offer 100% relief on qualifying assets, regardless of value. That's no longer the case. From April 2026, the 100% relief is capped at £2.5 million per individual, and any qualifying assets above that threshold now attract relief at only 50%, which equates to an effective 20% inheritance tax charge on the excess. For a married couple or civil partners, any unused portion of that allowance can now be transferred between them, in a similar way to how the nil rate band already works, effectively giving a couple up to £5 million of combined relief.

Why this matters during administration

For an executor, this isn't an abstract policy change; it's a calculation that now has to be done properly rather than assumed. Estates that would previously have passed a farm or business entirely free of inheritance tax may now have a real tax liability to account for, and that liability has to be identified, calculated and paid as part of administering the estate, generally within six months of the end of the month in which the person died, to avoid interest and penalties accruing.

This is where the practical difficulty tends to arise. Farms and businesses aren't cash, and paying a tax bill on an asset that can't easily be sold or divided is a genuine problem. HMRC allows inheritance tax on certain assets, including property, to be paid in instalments over ten years, which can ease the immediate pressure. However, the estate still needs advice on how to structure this properly and how it affects when a Grant of Probate can be obtained, since inheritance tax generally needs to be paid, or a payment plan agreed, before the Grant is issued.

Valuing the estate correctly

None of this works without an accurate valuation, and that's become more important, not less, now that the relief has a cap rather than being unlimited. Getting the valuation of a farm or business wrong, whether too high or too low, directly affects how much relief applies and how much tax is due. This is exactly the kind of detail and responsibility that an executor working through it alone, may not wish to shoulder on their own, since errors here carry personal liability for the Personal Representative if the estate ends up underpaying or overpaying HMRC.

What this means if you're administering an estate now

If someone has died since April 2026 and their estate includes agricultural or business assets, this needs to be factored into the administration from the outset, not discovered partway through. The relief cap changes the inheritance tax position, the payment timeline, and potentially the order in which assets need to be dealt with, particularly if part of the estate needs to be sold or a payment plan needs to be agreed with HMRC before the Grant can be obtained.

This is also a reminder of something the SRA-regulated probate process already accounts for well: full estate administration means dealing with HMRC directly, handling the inheritance tax calculation and payment, and obtaining the Grant of Probate, rather than the executor trying to navigate a legislative change like this one on their own, often at the same time as they're grieving.

Administering an estate with a farm or business?

If you're dealing with the administration of an estate that includes agricultural or business assets, get in touch. We can talk you through what the new relief caps mean for that estate specifically, and handle the inheritance tax calculation, payment and Grant application as part of the full administration.