IHT on Estates Over £2 Million UK: RNRB Taper, Planning Strategies, and the £1 Million Threshold (2026)
Estates above £2,000,000 face a 60% effective IHT marginal rate in the RNRB taper band — for every £2 above £2m, £1 of RNRB is lost (worth £400 in extra IHT) plus 40% normal IHT on the amount itself. Estate equalisation between spouses, AIM BPR shares, and charitable legacies are the priority tools to recover the RNRB and reduce the large estate IHT bill.
| Estate Size (Single) | RNRB Available | Effective Threshold | Approx. IHT Bill |
|---|---|---|---|
| £1,500,000 | £175,000 (full) | £500,000 | £400,000 |
| £2,000,000 | £175,000 (full — right at taper threshold) | £500,000 | £600,000 |
| £2,100,000 | £125,000 (tapered) | £450,000 | £660,000 |
| £2,200,000 | £75,000 (tapered) | £400,000 | £720,000 |
| £2,350,000+ | £0 (fully lost) | £325,000 NRB only | £810,000+ |
Illustrative figures assuming all home passes to direct descendants and no other reliefs. 2026–27 rates. Professional advice essential for large estates.
IHT Planning for Estates Over £2 Million: Complete Guide
How the RNRB taper works above £2 million
The Residence Nil-Rate Band (RNRB — s8D IHTA 1984) tapers at a rate of £1 for every £2 by which the net estate exceeds £2,000,000. The net estate for taper purposes is the gross estate less liabilities (mortgages, debts) but before deducting the NRB or RNRB themselves. Examples of the taper in action: (1) Estate £2,100,000 (single): excess over £2m = £100,000; RNRB reduction = £50,000; remaining RNRB = £125,000; (2) Estate £2,350,000 (single): excess over £2m = £350,000; RNRB reduction = £175,000; remaining RNRB = £0 (fully tapered); (3) Estate £2,200,000 (couple, second death with transferred RNRB): combined RNRB = £350,000; excess = £200,000; reduction = £100,000; remaining RNRB = £250,000. For a married couple where all reliefs and transferred thresholds are available, the RNRB is completely lost at £2,700,000 (£2m + £350,000 combined RNRB × 2 = £2,700,000). The taper creates a 60% effective marginal IHT rate in the taper band (between £2m and the full-loss threshold): each £2 above £2m costs £1 in RNRB reduction (worth £400 in lost relief — 40% × £1,000 RNRB) plus 40% normal IHT on the £2 = £800 + £400 = £1,200 total IHT on £2,000, an effective rate of 60%. This makes the taper band a priority target for planning.
Why every £2 below £2m is worth more than £1 in IHT saving
In the taper band (£2m to £2.35m single; £2m to £2.7m couple), every £2 you reduce the estate saves not only 40% × £2 = £0.80 in normal IHT on that amount, but also recovers £1 of RNRB (worth £400). Total saving per £2 reduced: £0.80 + £0.40 = £1.20. Effective saving rate: 60%. This means planning to keep the estate just below £2m is disproportionately valuable compared with planning elsewhere in the estate. If your estate is £2,200,000: you are £200,000 into the taper; reducing the estate by £200,000 (a PET of £200,000 to children, or investing £200,000 in AIM BPR shares) would recover £100,000 of RNRB (saving £40,000 in IHT) and also reduce the taxable estate by £200,000 (saving £80,000 in IHT at 40%) — total saving £120,000. Effective rate of return on the planning action: 60% of the amount gifted or AIM-invested. Compare with planning on estates below £2m or above the taper range: the effective rate is 40% (standard IHT rate on estate reduction). The taper band is where large-estate planning is most leveraged.
Estate equalisation between spouses: reducing the taper exposure
Where the estate is concentrated in one spouse's name, and the combined estate exceeds £2m, estate equalisation (transferring assets between spouses during life) can reduce the larger spouse's estate below £2m. Transfers between spouses are IHT-exempt (s18 IHTA 1984 — spousal exemption). They are also CGT-free if made at no gain, no loss between spouses. Example: Husband has estate of £2.8m; wife has estate of £200,000. Combined: £3m. If husband dies first, his RNRB is fully tapered (estate £2.8m >> £2.35m threshold). If wife dies first, her RNRB is fully available (estate £200,000 well below £2m). If they equalise during life by transferring £800,000 from husband to wife: Husband: £2,000,000 (right at the taper threshold); Wife: £1,000,000. Neither estate is above £2m; both have full RNRB available. IHT saving: husband's estate recovers £175,000 RNRB = £70,000 IHT saving. Plus the wife's estate (on her death) also keeps full RNRB, saving further. This equalisation can save up to £140,000 in IHT (£70,000 per RNRB) for a couple where the asset imbalance was large. Equalisation requires actual legal transfer of assets — a change in bank account ownership, transfer of property (SDLT and legal costs apply to property transfers even between spouses), or investment account retitling.
AIM BPR shares: reducing a large estate to below £2m within 2 years
Investing in AIM-listed shares that qualify for Business Property Relief (BPR — s105(1)(bb) IHTA 1984) removes the value from the IHT estate after two years. For an estate of £2.3m, investing £300,000 in qualifying AIM shares would: (1) After 2 years: reduce the taxable estate from £2.3m to £2m (the AIM shares qualify for 100% BPR and are not counted in the taxable estate); (2) Bring the estate right to the £2m taper threshold; (3) Preserve the full £175,000 RNRB. IHT saving: £70,000 (40% × £175,000 RNRB recovered) + £80,000 (40% × £200,000 estate reduction below NRB) = up to £150,000. The AIM shares remain accessible during life (can be sold; if reinvested in qualifying AIM shares within 3 years, BPR is maintained — s107 replacement property relief). From April 2026, the combined BPR/APR relief cap is £1,000,000 — above £1m the relief is 50% (effective 20% IHT rate). For estates just above £2m, the amounts needed in AIM shares are typically well below £1m, so the 100% BPR rate applies in full. The two-year investment period is the key constraint — investing should happen as early as possible.
Charitable legacy and the 36% reduced rate for large estates
Leaving 10% or more of the net estate to charity triggers the 36% reduced IHT rate (s36 IHTA 1984 / Finance Act 2012) on the remaining chargeable estate. For a large estate, this has two IHT benefits: (1) The charitable amount is exempt from IHT under s23 IHTA 1984 — directly reducing the taxable estate; (2) The remaining estate pays IHT at 36% rather than 40% — a 4% saving on the residual chargeable estate. Additionally, for estates just above the £2m RNRB taper threshold, a charitable legacy of sufficient size may reduce the net estate below £2m (or into a lower taper zone), recovering some or all of the RNRB. Example: estate £2,200,000; charitable legacy of £200,001 (just over 10% of net estate): the net estate is now £1,999,999 — below the £2m taper threshold; the RNRB is fully available; the 36% rate applies on the residual estate. The exact arithmetic requires professional calculation, but the principle is well-established: strategic charitable giving in the will can generate disproportionate IHT savings for estates near the taper band.
Will structure for estates above £2 million: NRB trust and RNRB optimisation
For estates well above £2m where the RNRB is tapered or lost, the will should be structured with professional advice to: (1) Ensure the main home passes outright or via an IPDI to direct descendants — claiming whatever RNRB remains after the taper; (2) Use an NRB discretionary trust for the NRB amount (£325,000) — directing other estate assets into the trust to use the NRB efficiently on first death, preventing the NRB being 'wasted' on assets passing to a surviving spouse under the spousal exemption; (3) Consider a surviving spouse's IPDI for the balance of the estate — the spousal exemption applies, deferring the IHT until the second death while preserving the assets; (4) On the second death, the trustees' appointment of trust assets to beneficiaries can optimise the NRB and transferred NRB. Large-estate will planning requires professional legal and financial advice — the optimal structure depends on the specific asset mix, family circumstances, and tax position. WillSafe kits provide the legal foundation; specialist IHT and estate planning advice is recommended for estates significantly above £2m.
Frequently Asked Questions
What happens to the RNRB for estates over £2 million?
The RNRB (s8D IHTA 1984) tapers by £1 for every £2 the net estate exceeds £2,000,000. A single person's RNRB (£175,000) is fully tapered at £2,350,000. A married couple's combined RNRB (£350,000) is fully tapered at £2,700,000. In the taper band, the effective IHT marginal rate reaches 60% — making estate reduction in this range disproportionately valuable. Every £2 reduced below £2m saves £1.20 in IHT (vs £0.80 outside the taper band).
What is the effective IHT rate for estates in the RNRB taper band?
60% effective marginal IHT rate in the taper band. This is because each £2 above £2m generates: (a) £1 of RNRB reduction (worth £400 in lost IHT relief — 40% × £1,000) + (b) standard IHT of £0.80 (40% × £2). Total IHT cost: £1.20 per £2 = 60%. This is why planning to reduce the estate below £2m (via AIM shares, PETs, charitable legacy, or estate equalisation) is so high-value for larger estates.
What are the best strategies for IHT planning on an estate over £2 million?
The priority strategies for estates over £2m (in rough order of impact): (1) Estate equalisation between spouses — move assets to bring both estates below £2m; (2) AIM BPR portfolio — reduces taxable estate by 100% of invested amount after 2 years; (3) Lifetime PETs to children — reduces estate immediately (7yr clock starts); (4) Charitable legacy of 10%+ for 36% reduced rate AND estate reduction below £2m (recovering RNRB); (5) Pension contributions before April 2027; (6) Annual gifting (£3,000/yr); (7) Professional will planning to maximise available RNRB despite the taper.
What is estate equalisation and how does it help with the RNRB taper?
Estate equalisation is transferring assets between spouses so both estates are roughly equal — typically to bring the larger estate below the £2m RNRB taper threshold. Transfers between spouses are IHT-exempt (s18 IHTA 1984) and CGT-neutral (no gain/no loss). If one spouse has £2.8m and the other £200,000: transferring £800,000 to the lower-value spouse brings both estates below £2m, preserving both full RNRBs (£175,000 each) — saving up to £140,000 in IHT.
Can a charitable legacy help with the RNRB taper on a large estate?
Yes — a charitable legacy reduces the net estate directly (the charitable amount is IHT-exempt under s23 IHTA 1984). If the charitable gift is large enough to reduce the estate below £2m, it recovers RNRB that was being tapered away. Additionally, if the charity gift is 10%+ of the net estate, the 36% reduced IHT rate (s36 IHTA 1984) applies on the residual estate. The combination of charitable gift reducing the estate AND triggering the 36% rate can produce very efficient IHT outcomes for large estates near the taper band.
Large Estate? Start With the Right Will
For large estates, the will structure directly determines how much RNRB is available and whether the NRB is used optimally. WillSafe will kits for England and Wales provide the legal framework — backed by specialist IHT planning to maximise what your family receives.
View Will Kits from £39.99