Inheritance Tax on £2.5 Million Estate UK: How Much IHT, RNRB Taper, and Reduction Strategies (2026)
At £2.5 million, the RNRB is fully tapered away for a single person (IHT = £870,000) and significantly eroded for a couple (£700,000). AIM BPR reduces the IHT but cannot restore the RNRB — only lifetime gifts that bring the estate below £2m can recover the full £350,000 combined RNRB and save up to £300,000 in tax.
| Scenario | Threshold | Taxable | IHT | Notes |
|---|---|---|---|---|
| Single, £2.5m, RNRB fully tapered | £325,000 (NRB only — RNRB = £0) | £2,175,000 | £870,000 | RNRB fully tapered at £2.35m; at £2.5m, single loses all £175k RNRB vs a £2m estate |
| Married couple, £2.5m (survivor's estate), partial tNRBs + partial tRNRBs | £750,000 (NRBs £650k + remaining combined RNRB £100k) | £1,750,000 | £700,000 | Taper: excess £500k; combined RNRB reduction £250k; remaining £100k RNRB; IHT = 40% × £1.75m |
| Married couple, £2.5m, tNRBs only (RNRB lost — home in discretionary trust) | £650,000 (tNRBs only; both tRNRBs lost) | £1,850,000 | £740,000 | RNRB lost on both deaths (discretionary trust); couple loses full £350k combined RNRB = £140k extra IHT |
| Single, £2.5m, AIM BPR £500k (2yr+, 100% exempt) | £325,000 (NRB only; RNRB still = £0) | £1,675,000 (£2.5m − £500k AIM exempt − £325k NRB) | £670,000 | BPR saves £200k IHT but does NOT restore RNRB; taper still based on £2.5m gross estate |
| Couple, £2.5m, AIM BPR £500k + partial tRNRBs | £750,000 (NRBs £650k + £100k remaining RNRB) | £1,250,000 (£2.5m − £500k AIM − £750k threshold) | £500,000 | BPR saves £200k vs no BPR; RNRB taper still on £2.5m; combined IHT reduction: £200k via BPR |
| Couple, £2.5m, lifetime PET £500k (survived 7yr) — estate at death = £2m | £1,000,000 (full tNRBs + tRNRBs restored at £2m) | £1,000,000 (£2m − £1m threshold) | £400,000 | Giving away £500k brings estate to £2m; full £350k combined RNRB restored; saving £300k vs no PET |
| Single, £2.5m, charitable legacy £600k (36% rate; estate reduced to £1.9m) | £500,000 (NRB + full RNRB restored below £2m) | £1,400,000 (£1.9m − £500k threshold) | £504,000 (36% × £1.4m) | Charity reduces estate to £1.9m (below £2m taper): RNRB restored; 36% rate (s36 IHTA). Estate leaves £600k to charity + £504k IHT. Net to family: £1.396m vs £870k if no charity (family gets more; HMRC gets less) |
IHT rate: 40% (s7 IHTA 1984). NRB: £325,000 (frozen to 2030). RNRB: £175,000 per person (frozen to 2030). RNRB taper: s8E IHTA 1984 — £1 per £2 above £2m adjusted net estate. Single RNRB fully tapered at £2,350,000 (excess £350k; reduction £175k). Couple combined RNRB (£350k) fully tapered at £2,700,000. Adjusted net estate for taper: s8F IHTA 1984 — BEFORE BPR/APR relief (AIM shares included at full value). Transferred NRB: s8A IHTA 1984 (IHT402). Transferred RNRB: s8G IHTA 1984 (IHT436). Spousal exemption: s18 IHTA 1984. RNRB LOST: discretionary trust. RNRB preserved: IPDI trust (s49A IHTA; s8H IHTA). BPR: s105(1)(bb) IHTA 1984 — AIM 100% after 2yr; £1m combined BPR/APR cap April 2026. PETs: s3A IHTA 1984 — 7yr clock. Normal expenditure from income: s21 IHTA — uncapped; immediate. 36% reduced rate: s36 IHTA 1984 — 10% charity of baseline. DC pensions: enter estate April 2027 (Budget 2024). Lifetime PETs: best tool to restore RNRB taper — brings estate below £2m; restores full RNRB.
IHT on £2.5 Million Estate: Complete Guide
IHT on a £2.5 million estate — the taper has struck
At £2,500,000, the RNRB taper (s8E IHTA 1984) has done serious damage for a single person: the taper starts at £2m (£1 per £2 excess) and fully eliminates the RNRB at £2,350,000. So at £2.5m, the single person's RNRB = £0 — they receive no RNRB benefit despite being exactly the sort of person the policy was meant to help. Their IHT threshold is just the NRB: £325,000. Taxable estate: £2,175,000. IHT: 40% × £2,175,000 = £870,000. This is £210,000 MORE IHT than if the estate were just £2m (where the full RNRB is still available, giving IHT of £660,000 if RNRB + NRB = £500k threshold). For a married couple on the survivor's second death: the taper reduces the combined RNRBs (£350,000) proportionately. At £2.5m: excess over £2m = £500,000; combined RNRB reduction = £250,000; remaining combined RNRB = £100,000; threshold = transferred NRBs £650,000 + remaining RNRBs £100,000 = £750,000. IHT = 40% × £1,750,000 = £700,000. If no RNRB at all (home in discretionary trust): threshold = £650,000; IHT = 40% × £1,850,000 = £740,000. At £2.5m, the couple's remaining RNRB (£100,000) is only worth £40,000 in IHT saving — a shadow of its full £140,000 value at £2m.
Reducing IHT on a £2.5m estate — lifetime gifts are the most effective tool
The most impactful strategy for a £2.5m estate is reducing it below £2m through lifetime gifts — which both reduces the IHT bill AND restores the RNRB. This is a double benefit that no other strategy delivers: AIM BPR reduces the IHT on the exempt assets, but NOT the RNRB taper (which uses the gross estate including AIM shares — s8F IHTA). Charitable legacies can partially help if they bring the estate below key thresholds. Only actual transfers (lifetime PETs, annual exemption, normal expenditure from income) reduce the gross estate. Scenario: couple with £2.5m estate; give away £500,000 to children as PETs; survive 7 years; estate on second death = £2m; full combined RNRB (£350,000) restored; threshold = £1m; IHT = 40% × £1m = £400,000. This compares to £700,000 IHT without the PETs — a saving of £300,000 (the IHT saved on the gifts themselves is zero after 7yr + the RNRB restoration is worth 40% × £250,000 = £100,000, combined with the direct estate reduction of 40% × £500k × (1 - combined effect) = approximately £300,000 total). Annual exemption: each person can give £3,000/yr — a couple giving £6,000/yr; over 10 years = £60,000; modest vs the £500,000 needed to get below £2m but certain and immediate. Normal expenditure from income (s21 IHTA): uncapped, immediate — a high-income couple can gift thousands per year from investment income, pension income, or rental income surplus, reducing the estate progressively year by year.
AIM BPR for a £2.5m estate — significant but not complete
AIM Business Property Relief (s105(1)(bb) IHTA 1984) at 100% after 2 years remains one of the most powerful IHT tools for a £2.5m estate, but its interaction with the RNRB taper means it works differently than many expect: (1) AIM BPR reduces IHT: £500,000 in AIM BPR qualifying shares reduces the chargeable estate. Single person with £2.5m estate and £500k AIM: taxable = £2.5m − £500k (AIM exempt) − £325k (NRB) = £1.675m; IHT = 40% × £1.675m = £670,000. Saving: £200,000 vs no BPR. For a couple: taxable = £2.5m − £500k AIM − £750k threshold = £1.25m; IHT = £500,000; saving £200,000. (2) AIM BPR does NOT restore the RNRB taper: HMRC uses the adjusted net estate (s8F IHTA) including the AIM shares at full value when calculating the taper. So a £2.5m estate with £500k in AIM shares: adjusted net estate for taper = £2.5m; single person: RNRB still = £0 (fully tapered). The saving from AIM BPR is real (£200,000) but does not address the RNRB loss. (3) From April 2026 — £1m combined BPR/APR cap: only the first £1m of qualifying BPR/APR assets is fully exempt; the excess is 50% exempt (20% effective IHT rate). For a £2.5m estate, investing £1m in AIM BPR qualifying shares: first £1m = 100% exempt; IHT saved = 40% × £1m = £400,000. Effective combined strategy: £1m AIM BPR + lifetime PETs to bring remaining estate below £2m + RNRB restoration.
Charitable legacy strategy at £2.5m — using the 36% rate and RNRB restoration
For a single person with a £2.5m estate, strategic charitable giving can: (1) reduce the adjusted net estate below £2m (restoring the RNRB); and (2) trigger the 36% reduced IHT rate (s36 IHTA 1984 — Finance Act 2012) simultaneously. To reduce the estate below £2m: the charitable legacy must be at least £500,000 (to bring £2.5m to £2m). Combined effect: estate = £2.5m; charitable legacy = £600,000; chargeable estate = £1.9m (below £2m — RNRB restored); 10% charity condition: 10% of baseline (£1.9m − £500k threshold) = 10% × £1.4m = £140,000; but the charity legacy is £600,000 (much more than 10%) — 36% rate applies; IHT = 36% × £1.4m = £504,000. Net to family: £1.9m − £504k IHT = £1.396m. Net to charity: £600,000. Total distributed: £1.396m + £600k = £1.996m ≈ full £2m. Compare: no charity — IHT = £870,000; family gets £1.63m. With charity £600k + 36% rate + RNRB restored: family gets £1.396m and charity gets £600k. The family loses £234k (because they chose to give £600k to charity but got £366k IHT reduction in return — net cost of the donation to the family = £600k − £366k savings = £234k, which funds the charity at a highly subsidised rate). This is the 'HMRC subsidises the donation' principle at work: HMRC effectively contributes over 60% of the charitable gift.
April 2027 pension reform — additional IHT exposure for a £2.5m estate
From 6 April 2027, unspent DC pension funds (SIPPs, personal pensions, DC occupational schemes) enter the IHT estate (Budget 2024 reform). For a person with a £2.5m personal estate PLUS a £500,000 SIPP: currently (pre-April 2027): SIPP is outside the estate; IHT on £2.5m estate = £870,000 (single, no RNRB). From April 2027: estate = £2.5m + £500k SIPP = £3m; IHT = 40% × (£3m − £325k) = 40% × £2.675m = £1,070,000 — an additional £200,000 IHT from the pension alone. Planning before April 2027: (1) draw down the pension strategically (taxable income reduces IHT estate; may be more tax-efficient than leaving it in the SIPP); (2) reinvest drawn pension income in AIM BPR qualifying shares (immediately IHT-exempt after 2yr); (3) give surplus pension drawdown income as PETs or normal expenditure from income (s21 IHTA) to reduce the estate; (4) for a couple: pension drawdown into lifetime gifts to children progressively reduces the estate below key thresholds (£2m RNRB taper; below NRB for small estates); (5) update pension nominations — in an estate where the pension is now entering IHT anyway (from April 2027), the nomination may be less critical for IHT avoidance; but updating nominations to include charities or trusts may still be beneficial.
Frequently Asked Questions
How much inheritance tax is payable on a £2.5 million estate?
IHT on a £2.5 million estate depends on your situation: Single person — the RNRB is fully tapered to zero at £2.35m, so at £2.5m the threshold is NRB £325,000 only; taxable = £2,175,000; IHT = £870,000. Married couple — combined RNRB (£350,000) is partially tapered: excess £500k over £2m; reduction £250k; remaining RNRB = £100k; threshold = £750,000; taxable = £1,750,000; IHT = £700,000. If the home is in a discretionary trust (RNRB lost): couple's threshold = £650,000 (NRBs only); IHT = £740,000. The most impactful reduction: lifetime PETs of £500,000 (survive 7yr) bring the estate to £2m — full £350k combined RNRB restored for a couple; IHT falls from £700k to £400k — saving £300,000.
Does the RNRB still apply to a £2.5 million estate?
For a single person: no — the RNRB is fully tapered to zero at £2,350,000. At £2.5m, a single person has zero RNRB; the threshold is NRB £325,000 only. For a married couple (survivor's estate): the combined RNRB (£350,000) is partially tapered at £2.5m — excess £500,000 over £2m; combined RNRB reduced by £250,000; remaining combined RNRB = £100,000; threshold = £750,000. Strategies to restore the RNRB: lifetime gifts to bring the estate below £2m (single) or below the taper (couple); charitable legacies reducing the chargeable estate below £2m. BPR does NOT restore the RNRB — it reduces IHT on exempt assets but does not reduce the adjusted net estate for taper purposes (s8F IHTA 1984).
Can AIM BPR reduce the IHT on a £2.5 million estate?
Yes — but it does not restore the RNRB. AIM BPR qualifying shares (s105(1)(bb) IHTA 1984) are 100% IHT-exempt after 2 years (up to the £1m combined BPR/APR cap from April 2026). For a single person with £2.5m and £500k in AIM BPR shares: taxable = £2.5m − £500k (AIM exempt) − £325k (NRB) = £1.675m; IHT = 40% × £1.675m = £670,000 — saving £200,000 vs no BPR. However: HMRC calculates the RNRB taper on the adjusted net estate INCLUDING the AIM shares (s8F IHTA 1984 — gross estate before BPR). So the single person's RNRB is still zero at £2.5m even with AIM BPR. To restore the RNRB, the actual estate must be reduced below £2m (single) or £2.35m (full RNRB for single) through lifetime gifts.
What is the most effective way to reduce IHT on a £2.5 million estate?
The most effective strategies, ranked by impact: (1) Lifetime PETs to bring the estate to £2m (couple): give away £500,000 to children; survive 7 years; full £350k combined RNRB restored; IHT falls from £700k to £400k — saving £300,000. This is the single highest-impact strategy for a couple. (2) AIM BPR £1m (from April 2026 cap) — saves £400,000 IHT (single); or £400,000 (couple) on the non-taper affected portion; combined with PETs for maximum impact. (3) Charitable legacy £600k + 36% rate + RNRB restoration (single): estate reduced to £1.9m; RNRB restored; 36% on £1.4m = £504k; family net = £1.396m vs £1.63m (no charity, IHT £870k). (4) Normal expenditure from income (s21 IHTA): uncapped, immediate; reduces estate year on year from income surplus. (5) Annual exemption: £3,000/yr per person; modest but certain.
How does the April 2027 pension reform affect a £2.5 million estate?
From 6 April 2027, unspent DC pension funds (SIPPs, personal pensions) enter the IHT estate. A person with a £2.5m estate and £500k SIPP: currently the SIPP is outside IHT; from April 2027 it enters the estate adding £200,000+ in IHT (40% × £500k). For a single person: total estate £3m; IHT = 40% × (£3m − £325k) = £1,070,000 — versus £870,000 on the estate alone. Planning before April 2027: draw down the pension strategically; reinvest drawn income in AIM BPR shares (100% exempt after 2yr) or give as PETs/normal expenditure from income (s21 IHTA). Reducing the estate from £2.5m to below £2m also recovers the RNRB for a single person — making pre-2027 estate reduction especially valuable.
At £2.5m, the Will Still Matters — and So Does Starting to Gift Now
The right will (RNRB-preserving, charitable legacy, IPDI trust) is essential — but the biggest IHT savings at £2.5m come from lifetime planning. WillSafe will kits from £39.99 ensure the will is right; start the gifting programme today.
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