On 6 April 2026, the most fundamental BPR/APR reform since the relief was introduced takes effect: the previously-unlimited 100% rate is capped at £1 million combined per estate. Value above the cap attracts 50% relief instead of 100%, producing an effective IHT rate of 20% on the excess above the allowance. AIM-listed shares drop to 50% relief regardless of the £1m allowance from the same date. The reform was announced in the Autumn Budget 2024 and is being legislated in the Finance Act 2026 cycle.

For most pure buy-to-let landlords, the reform changes nothing. Pawson v HMRC [2013] UKUT 050 settled over a decade ago that residential letting is investment, not trading, and therefore does not qualify for BPR in the first place. The cap matters where the estate already qualified for relief: farming families with APR-eligible land, property developers with trading work-in-progress, serviced-accommodation operators meeting the Pawson trading bar, and mixed estates running an active trading business alongside an investment portfolio. For those segments the cap can add hundreds of thousands of pounds of IHT to estates that previously paid nothing. This page walks the mechanics, names the affected segments precisely, and sets out the planning responses available before the reform date.

For the wider planning context (where this reform fits within the cumulative 2024-2027 IHT package), see the IHT Decision Framework for UK Landlords. For the underlying BPR eligibility question (does my property qualify at all?), the deeper page is Does Business Property Relief Apply to Rental Property?

What changed on 6 April 2026: the cap mechanics

Three concrete moves in the reform package.

  • £1 million combined cap at 100% relief. Each estate gets up to £1,000,000 of combined BPR plus APR-eligible value at 100% relief. The cap is single, not separate per relief; estates cannot stack £1m of BPR on top of £1m of APR.
  • 50% relief above the cap. Qualifying value above the £1m allowance attracts 50% relief, meaning 50% of the value is chargeable to IHT at the standard 40% rate (an effective 20% on the excess).
  • AIM-listed shares to 50%. Shares listed on the Alternative Investment Market previously qualified for 100% BPR after 2 years' ownership. From 6 April 2026 they qualify only at 50%, regardless of the £1m allowance (the published HMRC technical note suggests AIM shares sit outside the £1m allowance and have their own separate 50% tier; this is the most-likely-to-be-amended detail in the package).

The reform applies to deaths on or after 6 April 2026, and to chargeable lifetime transfers made on or after the same date. Anti-forestalling provisions catch arrangements designed to crystallise relief at the pre-reform rate via accelerated lifetime transfers in the run-up.

Who is actually affected: four segments

1. Farming families with APR-eligible land

The most-discussed segment in the public reaction to the reform. Working farms typically qualify for APR at 100% on the agricultural value of farmland and farm buildings, with associated farmhouse relief where the farmhouse is occupied for agricultural purposes. A £3m working farm pre-reform attracted £0 of IHT; post-reform, £2m sits above the cap at 50% relief = £1m chargeable at 40% = £400,000 of new IHT. Farmer estates with land values typical for a 200-to-500-acre arable or mixed farm in the UK frequently sit in the £2m to £8m range and are materially affected.

2. Property developers with trading work-in-progress

Property development is trading where the activity is buying-developing-selling continuously, not holding for rental. Work-in-progress (land plus partly-built stock held for sale) is a trading asset and qualifies for BPR at 100% on the wholly-or-mainly-trading test. The cap applies. A developer holding £4m of WIP at death pre-reform paid no IHT on the trading element; post-reform, £3m sits above the cap and attracts £600,000 of new IHT. The reform incentivises winding down WIP through completed sales before 6 April 2026, but the practical lead times for completion (12 to 24 months on residential schemes) mean many developers cannot exit before the reform date.

3. Serviced-accommodation operators meeting the Pawson trading bar

Serviced accommodation can qualify for BPR where the operator provides substantial additional services beyond simple letting: managed reception, daily cleaning, breakfast service, restaurant, concierge, comparable to a hotel rather than a holiday let. The Pawson decision sets a high bar; most serviced-accommodation businesses do not meet it. Where they do, the operation qualifies for 100% BPR pre-reform. Post-reform, the £1m cap applies, so a £3m hotel-style operation pays IHT on £1m of excess at the 50% rate. The sister page on the Pawson test in the serviced-accommodation context covers the eligibility question in detail: Serviced Accommodation and BPR: Clearing the Pawson Trading Threshold.

4. Mixed estates with both trading and investment elements

The case that catches most family wealth at scale. A family with a £2m active trading business (manufacturing, services, professional practice) plus a £1.5m BTL portfolio plus a £1m main residence has a £4.5m estate. Pre-reform: £2m trading business at 100% BPR, £1.5m BTL at no BPR (investment), £1m main residence at standard treatment. IHT bill: £1.5m + £1m less NRB+RNRB allowances, taxed at 40% (with possible RNRB taper given the £2m threshold). Post-reform: £1m of the trading business at 100% BPR, £1m at 50% BPR, BTL and main residence as before. Net effect: £200,000 of additional IHT on the trading element previously fully sheltered.

Who is not affected: pure BTL landlords

Worth saying explicitly. The most common reader of this page is a UK landlord with a residential BTL portfolio. The reform changes nothing for that reader, because residential BTL never qualified for BPR in the first place. Pawson v HMRC [2013] confirmed that residential letting is investment activity, not trading. The wholly-or-mainly-trading test at IHTM25000 fails on the basic facts: a landlord collecting rent on residential property is making an investment, however actively managed.

The cap matters where the estate already qualified for relief. For pure BTL landlords:

  • The IHT bill on the BTL portfolio at death is unchanged by the cap (was 40% above NRB and RNRB pre-reform, is 40% above NRB and RNRB post-reform).
  • The persistent FIC-marketing claim that a limited-company structure delivers BPR on residential property is wrong, and the cap does not change that. The depth is at FIC IHT Treatment and the BPR Myth.
  • For mitigation routes that actually work for a pure BTL landlord (lifetime gifting outside GROB, life cover written in trust, FIC share dilution for growth-transfer, downsize-and-gift), see the decision framework.

The landlord segment most affected by the cap is the small subset operating serviced accommodation at the Pawson-distinguishing trading bar. Former FHL operators who shifted to serviced-accommodation post-April-2025 may sit close to this line; the abolition of the FHL regime in April 2025 is itself a relevant context, covered in Serviced Accommodation Tax After FHL Abolition. For the incorporation alternative post-FHL-abolition, see Transferring a Former FHL Portfolio to a Limited Company.

Worked example: mixed estate with trading business plus BTL

The Singh-estate persona. Family-owned manufacturing company with a current open-market valuation of £2,500,000. Owner-managers (two spouses) own 100% of the shares. They also hold a residential BTL portfolio in their personal names worth £1,200,000 (with £200,000 of remaining mortgages). Main residence worth £900,000. Combined pensions £400,000. Combined cash and ISAs £150,000.

The trading company shares qualify for BPR (manufacturing is trading). The BTL portfolio does not (residential letting is investment, Pawson). Main residence is standard. Pensions enter the estate from 6 April 2027.

Estate sizing on the 2027/28 basis (pension included). Gross estate: £2,500,000 + £1,000,000 net BTL + £900,000 main residence + £400,000 pensions + £150,000 other = £4,950,000.

Pre-cap (illustrative, on 2025/26 rules): £2,500,000 BPR at 100% = nil chargeable. Remaining estate £2,450,000 less combined NRB £650,000 less RNRB (fully tapered, estate over £2.35m) = £1,800,000 chargeable at 40% = £720,000 IHT.

Post-cap (on 2027/28 rules): £1,000,000 BPR at 100% = nil chargeable on first £1m of company. £1,500,000 BPR at 50% = £750,000 chargeable. Plus remaining estate as before. Combined chargeable: £1,800,000 + £750,000 = £2,550,000 at 40% = £1,020,000 IHT. The cap adds £300,000 of new IHT exposure to this estate.

Planning responses for the Singh estate: gift trading-company shares to children now (uses BPR at the time of gift; survives 7 years removes value from estate entirely); separate the spouses' ownership of the company shares so both £1m allowances are usable at second death; consider whole-of-life cover for the residual liability; review pension decumulation strategy in light of April 2027 inclusion.

Planning responses for affected estates

The four highest-impact moves before 6 April 2026, in priority order for most affected estates.

  1. Accelerate lifetime gifts of qualifying property. Gifts of qualifying BPR / APR property made before 6 April 2026 use the pre-reform 100% relief at the time of the gift (subject to the donor surviving 7 years for the gift to fall fully out of the estate). The 7-year clock starts at the gift date. For donors in good health under their mid-70s, this is the most direct way to lock in 100% relief on the affected value.
  2. Split ownership between spouses. Each spouse has their own £1m allowance at death. Transferring property between spouses to ensure each estate holds qualifying property up to the cap maximises the combined allowance at second death. Spousal transfers under s.18 IHTA 1984 are exempt from IHT and (under s.58 TCGA 1992) no-gain-no-loss for CGT, so the transfer itself is tax-neutral.
  3. Review the trading / investment split in business structures. The BPR eligibility test is wholly-or-mainly-trading. Where a business has crept into a mixed trading-investment profile (e.g. a trading company that has accumulated significant property assets held for rental rather than business operations), the entire business may have lost BPR eligibility. Restructuring to ring-fence the investment side (often into a separate property holding company) restores BPR on the trading side and keeps the cap question relevant rather than the eligibility question.
  4. Reassess AIM portfolios held for IHT shelter. AIM portfolios held primarily to qualify for 100% BPR after 2 years' ownership are now at 50%. The total tax efficiency of the AIM-shelter strategy is meaningfully reduced. For estates with significant AIM allocations, the question is whether the funds are better deployed in life cover written in trust (which delivers a known IHT-paying outcome) or simply repositioned to non-AIM equities held outside the BPR-shelter framework.

Anti-forestalling rules and the legislative pipeline

The reform was announced in the Autumn Budget 2024 (30 October 2024) with an effective date of 6 April 2026, giving around 17 months of run-up. Anti-forestalling provisions catch arrangements designed to crystallise relief at the pre-reform 100% rate where the underlying intent is to defeat the cap. The published draft legislation in the Finance Act 2026 cycle includes the following key transitional features.

  • Lifetime transfers made before 30 October 2024 are unaffected. Pre-announcement gifts retain their full pre-reform treatment regardless of when the donor dies, provided the gift was a genuine transfer of value at the time and not part of a defeating arrangement.
  • Lifetime transfers between 30 October 2024 and 6 April 2026 receive the pre-reform 100% relief at the time of the gift, but where the donor dies within 7 years of the gift and after 6 April 2026, the failed-PET calculation applies the post-reform rules to the gift value above the £1m allowance. This is the window most actively used for pre-reform gifting; the planning must factor the failed-PET risk for donors not expected to survive 7 years.
  • Trusts in existence at 6 April 2026 retain the pre-reform treatment for the property held at that date. Property added to existing trusts post-cap is subject to the £1m allowance and the cap regime. Anti-fragmentation rules expected in the technical note prevent the creation of multiple new trusts to multiply the £1m allowance per trust.
  • Business reorganisations intended to maximise BPR-qualifying property within the £1m allowance are generally permissible where the underlying activity is unchanged. Reorganisations designed primarily to create artificial qualifying property attract general anti-avoidance scrutiny under the GAAR.

The legislative pipeline. The reform sits in the Finance Act 2026 cycle, with the technical note published on gov.uk and the draft legislation under consultation. The published HMRC technical note carries the operative figures; the exact AIM mechanics and the trust anti-fragmentation rules are the two areas where the published detail is most likely to differ from the announcement headline. Any worked example a reader relies on should be re-checked against the consolidated published guidance at the time of action, not against summary commentary.

The reform's interaction with the consultation on pensions in IHT (effective 6 April 2027) is significant for affected estates. The two reforms together produce the most material change to UK estate planning for landlord-business families since the introduction of the residence nil-rate band in 2017. Practical planning needs to address both reforms together: a sequence that optimises for the BPR cap in 2025/26 may worsen the pension-IHT exposure for 2027/28 and vice versa.

Common misunderstandings about the cap

  • "BPR is being abolished." No. The 100% rate is being capped at £1m. Above the cap, 50% relief still applies (effective 20% IHT rather than the standard 40%). The relief continues to work; it just costs more above the cap.
  • "My BTL portfolio is now caught." Not by the cap directly. Pure BTL never qualified for BPR. The reform changes nothing for pure BTL landlords.
  • "I should just put my BTL in a company now to get BPR before the cap." The company structure does not deliver BPR on residential letting, before or after the cap. Pawson applies to the underlying activity, not the legal wrapper. See the FIC BPR myth page.
  • "The £1m allowance is per relief, so I get £2m total." No. The £1m is combined across BPR and APR. Estates with both reliefs share the single £1m allowance.
  • "I can transfer the allowance to my spouse like the NRB." No. The transferable nil-rate band mechanism does not apply to the £1m BPR/APR allowance. Each spouse's £1m is fixed to their own estate at their own death.

For the cross-cutting view of the 2026 landlord tax landscape (MTD, S24 stability, the April 2027 surcharge, and how this reform fits within it), see Major Landlord Tax Changes Coming in 2026.