A UK landlord's IHT exposure in 2027/28 will not look like its 2024/25 baseline. Three policy moves in the last two Budget cycles have changed the picture: the £325,000 nil-rate band and £175,000 residence nil-rate band are now frozen until 5 April 2030 (Autumn Budget 2024 extension); a £1 million combined cap on Business Property Relief and Agricultural Property Relief takes effect on 6 April 2026; and unused defined-contribution pension funds come into the deceased's estate for IHT from 6 April 2027. None of these in isolation is dramatic. Together they shift the planning calculus for any landlord whose net estate sits above the simple combined £1 million couple's allowance, which is most active portfolio holders.

This page is not a description of the rules. The descriptive pillar lives at Inheritance Tax on Rental Property Portfolios: UK Guide 2026, and you should read that first if you want the mechanics. What follows here is the decision framework: how to size your exposure under the new picture, which mitigations still work for a buy-to-let landlord and which have stopped working, the events that should trigger a re-plan, and the cost of delay.

Why the question changed in 2025 to 2027

For roughly two decades, the standard advice to a property-rich UK estate boiled down to three sentences. Keep your main residence in the spousal exemption envelope. Use the seven-year PET rule to peel off bits of the BTL portfolio while you are healthy. Let the pension sit outside the IHT estate as a generational backstop. The first sentence is still true. The second is more constrained by CGT cost than it used to be (residential CGT is now 18%/24% rather than 18%/28%, but the £3,000 annual exempt amount no longer absorbs even a single small disposal). The third sentence is being deleted.

From 6 April 2027 the pension is in the estate. From 6 April 2026 BPR for the small number of landlords who claimed it via genuinely-trading serviced-accommodation or development arms is capped. From 6 April 2030 the bands either uplift or do not, but no longer through statutory inflation linkage. The cumulative effect is that an estate sized for £400,000 of IHT in 2024 may be sized for £600,000 in 2028 without any change to the underlying assets. The decision is not whether to plan; it is which mitigation to deploy and when.

Have you actually got an IHT problem? The sizing step

Before any mitigation discussion, run a one-page sizing exercise. Get this number in front of you on paper, not in your head.

Total your estate at projected second death:

  • Main residence at open market value, plus any second home and overseas property in scope under the post-April-2025 residence-based regime.
  • BTL portfolio at open market value (tenanted state, typically 5 to 15 per cent below vacant possession), less mortgages and secured debt.
  • Pensions (DC pots, SIPP, SSAS, master trust). Include from 6 April 2027 onwards as in-scope; before that date, exclude unused DC funds.
  • Other assets (cash, ISAs, listed investments, valuables).
  • Less spousal exemption used on first death (typically zero net effect on the second-death sizing unless the first death used a discretionary nil-rate-band trust).

From that gross estate, subtract:

  • The combined NRB of £650,000 (transferable from first death, assuming no lifetime gifts exhausted it).
  • The combined RNRB up to £350,000, but only where a qualifying main residence passes to direct lineal descendants (children, step-children, adopted, foster, grandchildren). Nieces, nephews and siblings do not qualify.
  • The RNRB taper: subtract £1 of RNRB for every £2 of net estate above £2,000,000.

The result, multiplied by 40 per cent, is your IHT bill before mitigations. Apply 36 per cent instead of 40 per cent only where at least 10 per cent of the net estate is left to charity.

Worked example: the Khan estate, projected 2028. A Manchester landlord couple, both 62, with a £750,000 main residence, a six-property BTL portfolio worth £1,250,000 with £200,000 of remaining mortgages, £600,000 in combined SIPPs, and £200,000 of cash and ISAs. Total gross estate: £2,600,000. Apply combined NRB £650,000 plus full RNRB £350,000 (estate is £600,000 above the £2m taper floor, so RNRB is reduced by £300,000 to £50,000). Net taxable estate: £1,900,000. IHT at 40 per cent: £760,000. In 2024, before the pension inclusion, the same family had a net taxable estate around £1,250,000 and an IHT bill of £500,000. The 2024-2027 reforms add £260,000 to the bill without any change in assets.

What does your exposure look like by 6 April 2027? The changed picture

Re-run the sizing on three different bases and lay them side by side.

  1. 2025/26 baseline. Pensions excluded from the IHT estate (current rule). BPR and APR uncapped (pre-cap rule). This is the picture most advisor letters from before October 2024 were built on.
  2. 2026/27. Pensions excluded. BPR/APR capped at £1m combined. For pure BTL with no qualifying business property, identical to the 2025/26 number. For mixed estates with a genuine trading business or active serviced-accommodation operation, the number can jump materially.
  3. 2027/28 onwards. Pensions included. BPR/APR capped. This is the new structural baseline. Run this one as your default.

The deltas between the three rows are what each reform costs your specific estate. If the 2025/26 to 2027/28 delta is small (because you have minimal pension wealth and no trading-business element), most of the planning effort is unchanged from pre-2024 advice. If the delta is large (typical for landlord couples with serious pension provision), the structural decisions about pension decumulation order, when to start drawing down, and whether to fund a whole-of-life policy from current pension income all need to be re-opened.

Which mitigations still work for a BTL landlord?

Four mitigations survive the 2024-2027 reform package essentially intact. Each has a specific use case.

1. Lifetime gifting outside the GROB rules

The seven-year PET (Potentially Exempt Transfer) is the most reliable IHT mitigation for landlords with a BTL portfolio. Gift a property or a slice of a property to a child; survive seven years; the gift falls fully out of the estate. The constraint is the gift with reservation of benefit rule at s.102 Finance Act 1986: if you continue to benefit from the gifted property (live in it rent-free, take its rental income, use it as a holiday home), the gift is a GROB and remains in your estate notwithstanding the transfer. For BTL specifically, this is usually a clean gift: the donor was never living in the property, the donee takes the rental income from the date of transfer, no benefit reserved. For the main residence, the rules are tighter and require either paying full market rent to the donee or moving out completely. The depth on GROB lives in our sibling page on gifts with reservation of benefit.

Cost side: CGT at 18 per cent or 24 per cent on the gain at gift date, payable within 60 days under the UK Property service. The CGT side of the decision is covered in detail at CGT on Gifting Property to Family Members.

2. Whole-of-life cover written in trust

A whole-of-life policy on the second-death basis pays out on the second spouse's death and, where written into a discretionary trust at outset, the proceeds bypass the estate entirely. The executors receive a cash lump sum that can settle the IHT bill without selling the underlying properties. The premium is the trade-off. For a couple in their early 60s in good health with a £500,000 sum assured, an indicative premium is £400 to £800 per month, holding for life. The total cost over a 25-year horizon is usually well below the IHT saving for any meaningfully sized estate, but the cashflow has to be sustainable. Underwriting tightens after age 70 and becomes impossible past age 75 in many cases. The earlier the policy is written, the cheaper and the easier.

3. FIC share dilution

A Family Investment Company holding the BTL portfolio allows the founder to issue growth shares to the next generation (or to a trust holding shares for the next generation). Future capital appreciation accrues to the growth class from issue, removing it from the founder's estate. Lifetime gifts of the founder's freezer shares are PETs and fall out of the estate after seven years. The structure suits estates above roughly £1.5 million in residential property where the setup and ongoing cost (around £10,000 to set up, £4,000 a year to run) is small relative to the IHT saving. The persistent myth that BPR shelters the FIC's BTL holdings is wrong; Pawson v HMRC closed that door over a decade ago. We unpack this at length in our FIC IHT treatment and the BPR myth piece and the FIC framework decision at Family Investment Company for Property: Is It Worth It?

4. Downsize-and-gift

Where the main residence has reached a value the couple no longer needs (children moved out, retirement income covered), downsizing crystallises cash that can be gifted or used to fund cover. The Residence Nil Rate Band downsizing addition at IHTA 1984 ss.8FA-8FE preserves RNRB on a smaller replacement residence basis, so the band is not lost. The cash released from the move is then deployable for PET gifts, life cover premiums, or charitable bequests. This is a quietly powerful option for landlord couples in their mid-60s who are over-housed.

Which mitigations have stopped working, or never did, for BTL

The shadow side of the framework. Three options that show up in marketing material but do not, or no longer, work for a standard residential BTL landlord.

  • BPR for a BTL portfolio. Never worked. Pawson v HMRC [2013] UKUT 050 settled it. Residential letting is investment activity, not trading, and fails the wholly-or-mainly-trading test at IHTM25000. The April 2026 cap is downstream of this; the cap matters only to estates that already qualified for BPR (active hotel businesses, property development, mixed trading-and-investment estates). For pure BTL the cap is irrelevant because the starting position is no relief in the first place. Our deeper page is at Does BPR Apply to Rental Property?
  • Pension as IHT shelter. Worked until 5 April 2027 (under the current rules, unused DC pension passes to nominated beneficiaries outside the estate). Stops working from 6 April 2027 as announced in Autumn Budget 2024. The "use pension last" decumulation strategy that was rational from 2015 to 2024 needs reopening.
  • Holding BTL in an offshore company. Has not worked for IHT since 6 April 2017 under Schedule A1 IHTA 1984. UK residential property held through an overseas company is looked-through for IHT and remains chargeable. Combined with the April 2025 residence-based regime replacing the historic domicile rules, the offshore-envelope route is now a compliance burden with no IHT benefit.

The decision matrix: by estate size and decade of life

The right first move depends on where you are. Use this matrix as a starting point, not as a substitute for specialist advice.

Estate bandUnder 60, good health60 to 75, good health75+ or health concerns
Under £1m (sheltered by NRB+RNRB) Monitor only. Confirm RNRB qualifying main residence path. Monitor. Form 17 plus tenants-in-common to bank both NRBs. Will review. Confirm executor liquidity.
£1m to £2m Lead with lifetime gifting (small annual + larger PETs). Optional cover. Mix of gifting and cover. Start cover before age 70. Cover where available. Charitable bequests for rate reduction.
£2m to £3m (in RNRB taper zone) Aggressive gifting plus FIC restructuring where portfolio fits. Cover plus gifting. Decumulate pension to avoid stacking on death. Cover plus spousal repositioning. Discretionary NRB trust on first death.
£3m+ FIC plus gifting plus cover. Specialist work. FIC plus cover. Pension decumulation strategy critical. Cover plus charity plus discretionary trust planning.

The diagonal pattern is informative. Estates under £1m mostly need defensive monitoring. Estates over £3m mostly need structural moves regardless of age. The middle bands are where the age axis matters most, because the seven-year PET clock and the cover-underwriting window are both age-sensitive.

Trigger events that should force a re-plan

The plan is not a one-shot exercise. Mark these triggers in your calendar.

  • Regulatory dates that are coming. 6 April 2026 (BPR/APR cap takes effect). 6 April 2027 (pension inclusion). 5 April 2030 (current NRB/RNRB freeze ends). Any further surcharge announcement in the Autumn Budget cycle.
  • Personal events. Birth, marriage, or divorce in the family. Change in your or your spouse's residence status. Significant health change either spouse. Crossing one of the threshold tiers (£500k, £1m, £2m, £2.35m, £2.7m).
  • Portfolio events. Major acquisition or disposal that materially changes the gross estate value. Switching from joint tenants to tenants in common. Form 17 election. Refinancing that materially changes the secured debt against the portfolio.
  • Behavioural events. A child reaching the age where direct ownership becomes practical. A child marrying (which affects the gift recipient's matrimonial position). A grandchild born (which expands the RNRB-eligible donee class).

Practically, an annual review on the same date each tax year (typically the start of the new tax year in early April) plus an event-triggered review on any of the items above is the right rhythm.

The four most expensive decision mistakes

Patterns we see in real estates.

  1. Treating the residence nil-rate band as automatic. The RNRB is conditional. It applies only where a qualifying main residence passes to direct lineal descendants. It tapers above £2m. Couples who assume "we get a million tax-free" without checking the conditions routinely lose £140,000 to £280,000 because the residence does not pass to qualifying descendants (e.g., it is left to a sibling or a non-lineal beneficiary), or because the estate has crossed the taper threshold and most of the RNRB has been withdrawn.
  2. Gifting the main residence and continuing to live there rent-free. Classic GROB case. The house is gifted to children for legal title purposes, the parents continue to live there with no rent, the gift fails the s.102 FA 1986 test, and the property remains in the parents' estate at full market value. Years of seven-year-clock running are wasted. If the gift was intended, full commercial rent must be paid for as long as the donor occupies, or the donor must move out.
  3. Building the plan on the assumption that the pension stays outside IHT. Valid pre-6-April-2027. Invalid thereafter. Couples who have spent 10 years deferring pension drawdown in favour of taxable rental income (so the pension grows tax-free and passes outside the estate) need to revisit the entire decumulation order. The Autumn Budget 2025 cycle is expected to publish detailed implementation rules; the principle is set.
  4. Leaving the seven-year clock too late. The PET only works if you survive the gift by seven years. A landlord who decides to start gifting at 78 is rolling a dice. A landlord who starts at 62 is using a near-certainty. The compounding power of one well-timed PET in your early 60s often beats three rushed PETs in your late 70s.

A worked decision: Mark and Priya, BTL landlords in Bristol

To make the framework concrete. Mark and Priya are 63 and 61. They own their main home in Clifton (open market £950,000, no mortgage). They have a six-property BTL portfolio across Bristol and Bath (combined open market £1,750,000, total mortgages £550,000, so net BTL equity £1,200,000). They have combined SIPPs of £400,000 and ISAs of £250,000. They have two adult children, both married, no grandchildren yet.

Sizing on the 2027/28 basis. Gross estate: £950k + £1,200k + £400k + £250k = £2,800,000. Combined NRB: £650,000. RNRB: estate is £800,000 over the £2m taper floor, so RNRB is reduced by £400,000 from the £350,000 ceiling, fully eliminated. Net taxable estate: £2,800,000 less £650,000 = £2,150,000. IHT at 40 per cent: £860,000. They had not seen this number before; their 2023 letter from a generalist advisor sized it at £570,000, which excluded the pension and applied full RNRB without taper.

Decision sequence. First, the structural move: switch from joint tenants to tenants in common, update wills so the first-to-die's £325,000 NRB drops into a discretionary nil-rate-band trust rather than passing automatically to the survivor. This banks both NRBs at today's value regardless of what happens to the residence nil-rate band thereafter. Cost: roughly £1,500 in legal fees.

Second, the gifting move: gift two of the six BTL properties to the children now. Joint open market value £550,000, mortgages £180,000, so equity transferred £370,000. CGT at 24 per cent on the gain over base cost (assume £250,000 gain): £60,000 across both spouses (use of two annual exempt amounts shaves £1,440). The gift is a PET; survival of either spouse beyond seven years removes £550,000 of gross value from the estate, an IHT saving of around £220,000.

Third, the cover move: whole-of-life, joint-life-second-death, sum assured £400,000, written in trust. Indicative premium £550 per month for life. The cover handles the residual liability without forcing a fire-sale of remaining properties at death.

Fourth, the pension move: start drawing modest taxable income from the SIPPs to slow their growth, and use the income to top up the cover premiums. This converts pre-April-2027 pension growth into post-tax cashflow at known rates rather than letting it compound into a future IHT liability at 40 per cent.

Net effect projected to second death (assume 22 years, both surviving the seven-year clock on the gift): IHT down from around £860,000 to around £200,000. Total cost of the plan (legal fees, CGT, cover premiums over 22 years): around £210,000. The package saves around £450,000 net of all costs, with most of the benefit locked in by year eight after the PET clock runs.

When to act, and the cost of delay

The dominant cost of doing nothing is not the IHT itself; it is the loss of cheap mitigations as time passes. Cover is cheap at 60 and expensive at 70. The seven-year clock is a near-certainty at 60 and a flip of a coin at 78. The £3,000 annual exemption banks £6,000 a year per couple and is lost forever if unused. The £2 million RNRB taper threshold drifts inexorably closer with portfolio appreciation; once you cross it, recovering RNRB requires shrinking the estate, which is exactly the problem you started with.

The minimum first move for any landlord who has not actively reviewed their IHT plan since the Autumn Budget 2024 is the sizing exercise above on the 2027/28 basis. That sizing usually surfaces an unexpectedly large number; the unexpectedly large number is what drives the rest of the plan. The framework above gives you the structure to act on it, in priority order, by estate band and life stage. Lateral reading on the disposal side of the lifetime decision sits at Property Investment Exit Strategy, and the wider 2026 reform context at Landlord Tax Changes Coming in 2026.