Since 6 April 2026, the inheritance tax relief available on business and agricultural property has worked differently than it did before — a change confirmed in the Autumn Budget 2025 and now in effect. It’s worth setting out precisely what changed, since the coverage of this shift has often been more alarming than the actual mechanics warrant.
The core change, stated plainly
Before this change, qualifying business property and agricultural property could generally receive 100% inheritance tax relief with no upper limit. From 6 April 2026, that unlimited 100% relief has been replaced with a combined cap: the first £2.5 million of qualifying agricultural and business property (assessed together, not separately) still receives 100% relief. Anything above that £2.5 million combined threshold now receives 50% relief instead of 100%.
This is a meaningful change for larger estates, but it’s not the elimination of relief that some early coverage implied — it’s a cap on the unlimited version of a relief that still exists.
Where this figure came from, and why it moved once already
It’s worth knowing this cap wasn’t the original number floated. When first announced at the Autumn Budget 2024, the proposed cap was £1 million. It was subsequently revised upward to £2.5 million before taking effect. That revision matters beyond trivia — it’s a reminder that a rule discussed while still a proposal can change materially before it’s actually implemented, which is exactly why an article like this one should be checked against the current position rather than an earlier announcement, however recent that announcement felt at the time.
What married couples and civil partners should know
The £2.5 million allowance is transferable between spouses and civil partners in the same way the existing nil-rate band already works: any unused portion of the first spouse’s allowance can pass to the survivor. GOV.UK’s guidance doesn’t itself state a single combined ceiling in pounds — it describes the transfer mechanism rather than a headline figure — but the arithmetic of two individual £2.5 million allowances combining means a married couple or civil partnership can, in principle, shelter up to £5 million of qualifying business and agricultural property at the full 100% relief rate between them, not just £2.5 million as individuals. Whether a specific estate actually achieves that depends on how much of the first spouse’s allowance went unused.
How this sits alongside the standard inheritance tax thresholds
It’s worth placing this alongside the general rules that apply to any estate, not just those with business or agricultural assets:
- The standard nil-rate band is £325,000 — the amount any estate can pass on before inheritance tax applies at all
- The residence nil-rate band is a further £175,000, available specifically where a home (or its sale proceeds) passes to direct descendants — children, grandchildren, or their spouses
- Combined, these give many estates an effective £500,000 threshold before inheritance tax is due, before any business or agricultural relief is even considered
- The residence nil-rate band tapers away — reduced by £1 for every £2 the estate’s value exceeds £2 million — so very large estates may not benefit from the full £175,000 regardless of the business/agricultural relief question
- Both the nil-rate band and residence nil-rate band are currently frozen, with that freeze extended to remain in place until 5 April 2031
- Where inheritance tax is due, the standard rate is 40%, reduced to 36% where at least 10% of the net estate passes to charity
Two related changes worth knowing about, even though they’re not the main event
The same reform package has also been reported, by professional tax and legal advisers covering the Autumn Budget 2024 changes, to include two further adjustments that often get overlooked alongside the headline £2.5 million cap. First, relief on certain categories of unlisted shares — including shares traded on the Alternative Investment Market (AIM) — has been reduced from 100% to 50% in all circumstances, regardless of the £2.5 million threshold discussed above. Second, the option to pay inheritance tax in interest-free instalments over ten years has been extended to cover all property qualifying for agricultural or business relief from 6 April 2026. Both changes are consistently reported across professional advisory coverage of the reform, though readers relying on either point for a specific transaction should confirm the current detail directly with GOV.UK or an adviser, since neither is set out on the general guidance pages cited for the main £2.5 million cap above.
It’s also worth being aware, separately, that a further change — bringing most unused pension funds into the value of an estate for inheritance tax purposes — has been announced for a later date, currently understood to be April 2027. That’s a distinct reform from anything described above, affects a different asset category, and shouldn’t be conflated with the business and agricultural property changes already in effect.
Who this actually affects
In practical terms, this change is specifically relevant to estates that include business or agricultural property worth more than £2.5 million combined (or up to £5 million for a married couple using both allowances) — a meaningfully narrower group than “anyone inheriting a family business” might suggest. An estate with a smaller qualifying business, or one below the combined threshold, continues to receive the same 100% relief it always did. It’s one of several ways UK tax policy has shifted for wealth holders this year — alongside, separately, the end of the non-domiciled tax regime that’s been reshaping decisions elsewhere in wealth planning.
A worked illustration, with the assumptions stated plainly
It can help to see the mechanics applied to a round-number example — clearly labelled as illustrative, not a real case, and simplified by ignoring other estate assets or reliefs that would apply in practice. Take an estate with £4 million of qualifying business property and no other relevant assets. The first £2.5 million receives 100% relief — effectively removed from the inheritance tax calculation entirely. The remaining £1.5 million receives 50% relief, meaning £750,000 of that remaining amount is treated as relieved, and £750,000 is not. That £750,000, taxed at the standard 40% rate, would produce an inheritance tax liability of £300,000 — on an estate that, before April 2026, would have owed nothing on this property at all, since the old rules applied 100% relief without any upper limit. This is a simplified illustration only; a genuine estate would also need to account for the standard nil-rate band, any residence nil-rate band, and other assets and reliefs, all of which would change the actual figure.
What’s worth watching before this article is read, not just when it was written
The Autumn Budget for 2026 is scheduled for 28 October 2026. Inheritance tax, business property, and agricultural property have all been subjects of genuine policy attention over the past two Budget cycles, and it would be a mistake to assume no further adjustment is possible simply because this specific change is now in effect. Anyone making a decision based on this article should confirm the current position directly with GOV.UK or a qualified professional, particularly if reading this after that Budget date.
Why this change was made in the first place
It’s worth briefly noting the stated rationale, since understanding why a rule changed helps make sense of what it’s actually trying to achieve. The previous unlimited 100% relief on qualifying business and agricultural property had been criticised, including by some tax policy researchers, for being usable in ways that went beyond its original purpose of protecting working farms and genuine trading businesses from being broken up to pay an inheritance tax bill — for instance, by supporting arrangements where assets were restructured into qualifying form primarily to reduce an estate’s tax liability, rather than because the underlying business needed that specific protection. The £2.5 million cap is the government’s attempt to preserve the relief’s original protective purpose for smaller and mid-sized genuine businesses and farms, while limiting how much of it very large estates can access. Reasonable people disagree about whether the specific £2.5 million line is the right one — that’s a genuine policy debate this article isn’t taking a side in — but the underlying logic is worth understanding rather than treating the change as arbitrary.
What this article is not
This is a description of a public policy change, not personalised guidance. It doesn’t tell you what to do with a family business, a farm, or an estate plan — those are decisions that depend entirely on individual circumstances, and they’re exactly the kind of decisions where a general-information article is the wrong tool. If this change is relevant to your own situation, that’s a conversation worth having directly with a solicitor or tax adviser qualified to look at your specific position, not something to act on based on a general explainer.
What “qualifying” actually depends on
One further point worth flagging, without turning this into a full technical guide: whether a given business or agricultural asset actually qualifies for the relief at all — before the question of the £2.5 million cap even arises — depends on specific conditions around ownership period, the nature of the business, and how the asset is used, among other factors that HMRC’s own detailed guidance sets out. Not every business or farming asset automatically qualifies simply because it’s a business or a farm, which is precisely why this is a question for a qualified adviser to assess against the specific facts of an individual estate, not something a general explainer like this one can determine on a reader’s behalf.
The practical summary
From 6 April 2026, the first £2.5 million of combined qualifying business and agricultural property still receives 100% inheritance tax relief; the amount above that threshold now receives 50% relief rather than 100%; and married couples and civil partners can combine their allowances for up to £5 million at the full rate. This sits alongside — not instead of — the standard £325,000 nil-rate band and £175,000 residence nil-rate band that already apply to any estate.
Sources: GOV.UK — Inheritance Tax, GOV.UK — Agricultural Relief for Inheritance Tax, GOV.UK — Inheritance Tax Residence Nil Rate Band Guidance, House of Commons Library — Inheritance Tax: A Basic Guide
