If you farm land worth more than £2.5 million, your estate now faces an inheritance tax bill your parents never had to plan for. Here’s what changed, and what to do about it.
From 6 April 2026, the UK’s inheritance tax rules for agricultural and rural estates changed for the first time in more than 40 years. For farming families, landowners, and rural business operators, this is not a minor policy tweak — it is a trigger point for estate planning decisions already underway across the country.
The Big Picture
For over four decades, farming families relied on Agricultural Property Relief (APR) and Business Property Relief (BPR) to pass land, buildings, livestock, and business assets to the next generation without inheritance tax. In many cases, estates worth five or ten million pounds could be transferred entirely tax-free.
That era is now over. The Finance Act 2026 received Royal Assent on 18 March 2026, enshrining the new rules into law.
What Changed
- 100% IHT relief is now capped at £2.5 million per individual for combined APR and BPR assets.
- Above £2.5 million, only 50% relief applies, creating an effective 20% tax rate on assets above the threshold.
- Married couples and civil partners can transfer unused allowances, effectively shielding up to £5 million in qualifying assets combined.
- Existing nil-rate bands can lift total protection to approximately £5.65 million per couple.
- Unpaid tax can be spread over 10 annual interest-free instalments, reducing the risk of forced sales.
- The £2.5 million cap will be index-linked to CPI from 6 April 2031.
- AIM-listed and EIS shares (enterprise investment scheme shares that previously attracted full business property relief) will now only attract 50% relief.
- Transfers into trust from 6 April 2026 now incur an IHT entry charge at an effective rate of 10% on the value above the £2.5 million allowance.
Important: transitional rules apply to gifts and transfers made between 30 October 2024 and 6 April 2026. If the donor dies after 6 April 2026 within seven years of making such a gift, those transfers may reduce the relief allowance available on death.
What This Means in Practice
For the first time in a generation, many working farms face real inheritance tax exposure.
| Estate Value | Previous System | New System (Single Owner) | New System (Couple) |
| £2m | £0 | £0 | £0 |
| £3m | £0 | £100,000 | £0 |
| £5m | £0 | £500,000 | £0 |
| £8m | £0 | £1,100,000 | £500,000 |
| £10m | £0 | £1,500,000 | £900,000 |
Figures are illustrative and exclude nil-rate bands for clarity.
Even modest estates can now see six-figure liabilities where none existed before.
The Political Backdrop
When the reform was announced at the Autumn Budget in October 2024, it triggered immediate and widespread backlash across the UK farming sector.
Key developments included:
- Tractor protests outside Westminster, with farmer convoys driving through central London.
- Sustained pressure from the National Farmers’ Union and Country Land and Business Association.
- Strong internal concern from rural Labour MPs.
The government softened the policy on 23 December 2025:
- The threshold rose from £1 million to £2.5 million.
- Unused allowance became transferable between spouses and civil partners, including retrospective transferability in some cases.
- The estimated number of affected estates fell from roughly 375 to around 185 per year.
The Legal Challenge
A judicial review challenge was brought by Cambridgeshire farmer Tom Martin, his father George Martin, and the campaign group Farmers and Businesses for Fair Tax Relief. The claimants argued the government had acted unlawfully by failing to conduct a proper public consultation under its own Tax Consultation Framework.
The two-day High Court hearing took place on 17 and 18 March 2026 at the Royal Courts of Justice — the same week the Finance Act received Royal Assent. Judgment was handed down on 12 May 2026. Lady Justice Whipple and Mr Justice Fordham dismissed the claim. The court found there was no enforceable legal obligation on the government to consult on the reforms, and that tax policy arising from a Budget is primarily a matter for Parliament rather than the courts.
The claimants are considering their position in relation to a possible appeal to the Court of Appeal. Any such proceedings would not suspend the legislation.
| The legislation remains fully in force from 6 April 2026. The legal challenge has been heard and lost at first instance. Landowners should not wait for any further proceedings before reviewing their position. |
Land Values
Farmland values entered 2026 at historically elevated levels, even after a modest softening.
- Arable land averaged £11,000 per acre in 2025 — down 2% year-on-year but still 18% higher than five years ago.
- Pasture land averaged £8,600 per acre in 2025 — down 4% year-on-year but still 15% above five years ago.
- Knight Frank reported a slightly lower headline average of £8,700 per acre across England and Wales, with a 5% fall across 2025.
Regional variation matters. A 130-acre mixed holding could carry an agricultural value of £1 million to £1.4 million, but many farms in the Midlands, Home Counties, and South West hold land values well above £2.5 million — particularly where parcels sit on the edge of settlements and carry development hope value.
Hope Value
One of the most important and least understood drivers of inheritance tax liability is development potential — the hope value above agricultural use.
Inheritance tax is based on market value, not just farming value. If land has proximity to settlements, inclusion or potential inclusion in a local plan, an active promotion or option agreement, or credible long-term development prospects, it may be valued significantly above its agricultural use value for IHT purposes.
A tribunal case illustrates how sharply valuations can move. In Foster v HMRC, the executor of the estate valued the land at £191,700. HMRC, using a top-down approach, valued the same land at £590,000. The tribunal agreed with HMRC’s methodology. The principle is clear: hope value forms part of market value for IHT, and HMRC will apply it.
Why This Matters for Land Promotion
For landowners working with promoters or considering a land promotion agreement, timing is critical.
- Land identified in a local plan as having development potential may already attract hope value that inflates its estate value for IHT.
- As promotion progresses through pre-application, allocation, and planning consent, hope value increases at each stage — and with it, the potential IHT liability.
- If the landowner dies before the land is sold, the estate may face IHT on an inflated value even though no cash proceeds have yet been received.
This creates a specific risk: a significant IHT bill can crystallise before any sale proceeds arrive.
Legal specialists therefore recommend structures such as transferring a portion of land into trust before hope value is crystallised, when the value still sits within the £2.5 million cap, to shelter part of any eventual sale proceeds.
What Landowners Are Doing Now
Since the October 2024 Budget, legal and land agency practices have reported measurable shifts in landowner behaviour.
- Landowners who had never previously engaged with developers are now seeking option and promotion discussions.
- Demand for combined advice from land agents, tax advisers, and solicitors has increased sharply, particularly where agricultural value already approaches or exceeds £2.5 million.
- Some landowners are exploring lifetime gifting, but the seven-year survival rule and potential capital gains tax charges make this a nuanced route rather than a quick fix.
- Agents report farms taking longer to sell, as buyers adopt a more cautious approach amid land market softening and policy uncertainty.
The farms most likely to take proactive action are those with values between £2.5 million and £10 million, realistic development potential, and a live succession question.
What to Do Next
The 2026 inheritance tax reforms are not just a tax change. They are prompting landowners to reassess what their land is worth today, what it could be worth tomorrow, and how much will realistically pass to the next generation.
The question is no longer whether change is coming. It came into force on 6 April 2026, and the High Court has confirmed the legislation stands. The opportunity to plan ahead—before hope value rises further—is now.
If you’re unsure how these reforms may affect your land, Müller Property Group offers a no-obligation land appraisal. We’ll assess your land’s agricultural and development value, provide context on its planning potential and realistic promotion timescales, and explain how land promotion can be structured alongside professional tax and legal advice.
To request your confidential land appraisal, contact Müller Property Group today.
This article is intended as general commentary and does not constitute tax or legal advice. Landowners should seek specialist advice tailored to their own circumstances.
