The Residence Nil-Rate Band has been frozen three times. The first freeze in Spring Budget 2021 took the allowance through to 2025/26. The Autumn Statement of November 2022 extended the freeze through to 2027/28. The Autumn Budget of October 2024 extended it again, this time through to 5 April 2030. By that endpoint the RNRB will have sat at £175,000 in nominal terms for a full decade, and the £325,000 nil-rate band, which has been at its current level since 2009/10 and rides on the same Finance Act extensions, will have been frozen for 21 consecutive years.

The headline figures look familiar. Their real-world impact does not. Frozen allowances against rising house prices, rising pension values and rising inflation produce a phenomenon economists call fiscal drag: more estates drawn into inheritance tax, more substantial estates drawn into the £2m taper zone, and a roughly doubled IHT-paying estate count projected across the freeze period. The freeze is the largest single inheritance tax policy change of the decade, delivered without a headline rate increase.

This page is the news-led, fiscal-drag and planning-response pillar at orientation depth. It walks through the three-layer freeze timeline, explains fiscal drag as a mechanism, surfaces the often-omitted double-freeze (RNRB headline plus £2m taper threshold) and the 21-year frozen-NRB run by 2030, works a Surrey-couple example that quantifies the freeze cost, and lays out the planning-response menu at breadth. For the computational mechanics of the £2m taper itself, see our RNRB £2m taper for property portfolios deep.

The three-layer freeze timeline

Three Finance Acts deliver the freeze. Each builds on the last.

  • Layer one: Finance Act 2021 s.86 (Spring Budget March 2021). Froze the NRB at £325,000, the RNRB at £175,000 and the £2m taper threshold for the five tax years 2021/22 through 2025/26.
  • Layer two: Finance Act 2023 (Autumn Statement November 2022). Extended the freeze of all three allowances through 2027/28.
  • Layer three: Finance Act 2025 (Autumn Budget October 2024). Extended the freeze of all three allowances further, taking them through to 5 April 2030.

The structural reading is that the freeze has become an ongoing fiscal policy, not a temporary measure. Three successive Chancellors have chosen extension over uprating. Planning should be done on the assumption that the announced freeze holds and that the trajectory may extend further. Treating the freeze as transient is a planning error.

The same Finance Acts that froze the RNRB also froze the £325,000 nil-rate band. The NRB has been at that level since 2009/10. By 5 April 2030 that is 21 years of frozen NRB. Real-terms the NRB has lost roughly half its purchasing power over that period.

Fiscal drag: what the mechanism actually is

Fiscal drag is the simplest tax-policy concept and the most often misunderstood. It works in three steps.

  1. The cash rate of the allowance stays the same. £175,000 of RNRB, £325,000 of NRB, £2m taper threshold. No headline change.
  2. Everything around the allowance moves. House prices rise, pension pots grow with markets, inflation erodes purchasing power, wages drift upward, asset values reflect the broader economy.
  3. The cumulative effect is silent tax growth. Estates that were comfortably below the threshold drift over it. Estates that were below the taper zone drift into it. The number of estates paying IHT grows year on year without any rate change.

The OBR projects the proportion of UK deaths resulting in IHT-paying estates rising from roughly 4% pre-freeze toward 8% by the end of the decade. HMRC quarterly IHT receipts have been on a rising trend since the freeze began, recently reaching record highs. The driver is not the headline rate (40%, unchanged for decades) but the steadily expanding chargeable-estate base under the frozen thresholds.

Fiscal drag is often described as a "stealth tax". The descriptor is accurate as a matter of mechanism: the tax base grows without a legislated rate change. Whether that is good or bad policy is a matter outside this page's scope. The planning point is that fiscal drag is real, measurable, and going to continue across the announced freeze horizon.

The double-freeze: RNRB and the £2m taper threshold

Most generalist coverage of the freeze mentions the £175,000 RNRB and stops there. The £2m taper threshold is the often-omitted second half of the structural picture.

Under IHTA 1984 s.8D(5) and the s.8FA taper mechanic, the RNRB is reduced by £1 for every £2 by which the net estate exceeds £2,000,000. An estate of £2,350,000 has the £175,000 individual RNRB extinguished entirely; an estate of £2,700,000 (where the spouse's full RNRB has transferred) has the £350,000 combined RNRB extinguished entirely. The £2m taper threshold has been frozen alongside the RNRB headline rate since the 2017 introduction.

Why this matters: the £2m to £2.35m band (single individual) and the £2m to £2.70m band (couple with full TRNRB) is the highest-marginal-IHT-impact zone in the system. In that band, every £1 of estate growth costs the estate £0.50 of RNRB headroom, which translates into £0.20 of IHT exposure (because that £0.50 of lost RNRB would have shielded 40p of IHT). Combined with the 40p of IHT on the marginal pound itself, the effective marginal IHT rate in the taper zone is approximately 60%.

In London, the South-East and other high-value regions, the combination of a family home worth £1m or more, pension wealth of £500k or more, investments, and a buy-to-let or two can place a household in or near the taper band without the household realising it. The £2m threshold has not moved since 2017. Average UK house prices rose roughly 25% over the same period; in the South-East the figure is higher. The freeze plus property-price growth is steadily expanding the taper-band population.

The Surrey-couple worked example

Persona: Mr and Mrs Holloway, both 68, owning a family home in Surrey at £950,000 current value, with £1.1m of combined pension drawdown plus investments plus cash, and one BTL flat at £400,000. Combined gross estate approximately £2.45m at first death. First death assumed in 2026; all-to-survivor by Will plus spouse exemption under IHTA 1984 s.18; no IHT at first death; full TNRB and TRNRB carried forward.

Estate composition at second death (2031, five years later)

Modest 2% per annum property growth assumption (below the South-East historical average of roughly 4%):

  • Family home: £1.05m (£950k × 1.02⁵).
  • BTL flat: £440k (£400k × 1.02⁵).
  • Pension drawdown net of withdrawals: ~£900k.
  • Cash and investments: ~£200k.
  • Survivor's estate at second death: £2.59m.

RNRB position under the freeze

  • Combined RNRB available pre-taper: £175k plus £175k transferred = £350,000.
  • Estate exceeds the £2m taper threshold by £590k.
  • Taper reduction: £590k ÷ 2 = £295k.
  • Residual RNRB: £350k less £295k = £55,000.

(HMRC's view per IHTM46035 is that the s.8FA taper applies once to the combined NRB + RNRB allowance suite, with cumulation-rule precision required at the IHT computation step. Personal representatives should follow the form IHT400/IHT436 walkthrough or take advice.)

IHT computation at second death

  • Available allowances: NRB £325k + TNRB £325k + residual RNRB £55k = £705k.
  • Chargeable estate: £2.59m less £705k = £1.885m.
  • IHT at 40%: £754,000.

Sensitivity check at 4% growth

If property growth follows the South-East historical average of 4% per annum, the family home grows to £1.16m and the BTL to £487k by 2031. Survivor's estate ~£2.75m. The £350k combined RNRB is almost fully extinguished; the chargeable estate is ~£2.10m; IHT at 40% is ~£840,000. The freeze plus modest growth costs an extra £86k versus the 2% baseline.

Counterfactual: what would the IHT bill be if the allowances had uprated with CPI?

A rough indicative calculation. If the NRB had uprated with CPI from 2009 to 2030 (cumulative CPI of approximately 50%), the NRB might have reached £480k per individual by 2030. If the RNRB had uprated with CPI from 2017 to 2030, it might have reached £260k per individual. Combined allowances on the same Surrey couple's estate: £480k + £480k + £260k + £260k = £1.48m (ignoring the taper threshold uprating). On a £2.59m estate the chargeable amount would be ~£1.11m, IHT at 40% = ~£444,000.

The freeze costs this couple approximately £310k of additional IHT exposure versus a counterfactual uprated-allowances baseline (£754k less £444k). At the 4% growth sensitivity, the freeze cost is closer to £400k. The structural reading: the freeze costs typical home-plus-portfolio estates hundreds of thousands of pounds across the freeze horizon. The freeze is the largest single inheritance tax cost driver of the decade for this profile.

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The £2m taper illustration

Showing the marginal-pound impact across the taper band for a single individual (with full RNRB available):

Estate valueRNRB availableCombined NRB + RNRBEffective marginal IHT
£2.0m or below£175,000 (full)£500,00040p per £1 of growth
£2.1m£125,000£450,000~60p per £1 of growth
£2.2m£75,000£400,000~60p per £1 of growth
£2.3m£25,000£350,000~60p per £1 of growth
£2.35m and above£0 (fully tapered)£325,00040p per £1 of growth

The structural insight: the £2m to £2.35m band is where modest estate growth maps onto maximum marginal IHT impact. A £35,000 gain in that band (typical of one good year of property growth on a family home plus inflation on a pension pot) translates into roughly £21,000 of IHT exposure once the lost RNRB headroom is priced in. For couples with the full TRNRB available, the band extends to £2.70m on the same arithmetic.

The planning-response menu (breadth, not depth)

The freeze does not unlock any single silver-bullet planning lever. It tilts the calculus on the existing menu. The principal seven levers, in approximate order of suitability across the population:

Lever 1: spouse exemption plus transferable allowances

The baseline. IHTA 1984 s.18 exempts inter-spouse transfers (subject to the long-term-resident test from FA 2025). IHTA 1984 s.8G and s.8H allow the unused percentage of the first-to-die's NRB and RNRB to transfer to the survivor's estate, with the claim made on form IHT402 (TNRB) and IHT436 (TRNRB) within two years of the second death. This is the source of the headline £1m combined allowance for couples (subject to the closely-inherited condition and the £2m taper).

Lever 2: IPDI (Immediate Post-Death Interest) in the Will

The defensive will-trust route under IHTA 1984 s.49A. The first-to-die's will settles assets (typically the family home or a share of it) into trust with the surviving spouse as life tenant. Spouse exemption applies at first death; the IPDI is treated as part of the life tenant's estate for IHT under s.49(1); on second death the trust capital passes to the named remaindermen (typically the children) outside the survivor's personal-estate planning. IPDI preserves RNRB on closely-inherited routing and adds defensive value in blended-family or vulnerable-beneficiary scenarios.

Lever 3: downsizing addition

Where the deceased has sold or downsized from a qualifying residence on or after 8 July 2015, IHTA 1984 s.8L plus ss.8FB-8FE preserves RNRB up to the value of the foregone qualifying interest. Critical: the personal representatives must claim the addition explicitly on form IHT435 with supporting evidence (original residence, disposal value, disposal date, subsequent estate composition). The downsizing addition is a structurally important lever for the retirement-downsize narrative and is missed in a meaningful proportion of estates.

Lever 4: lifetime gifting (PETs and the 7-year clock)

Outright gifts to individuals are Potentially Exempt Transfers under IHTA 1984 s.3A. The gift becomes fully exempt at year seven; failure (donor dies within seven years) brings the gift back into the estate with taper relief on the IHT (not on the value) for years four through seven. The CGT-versus-IHT trade-off needs careful work: appreciated property gifted in lifetime crystallises CGT under TCGA 1992 s.17 with no holdover for non-trading assets, and the s.62 CGT uplift on death is lost. See our lifetime-vs-death decision pillar for the comparative framework.

Lever 5: charitable bequest at 36% reduced rate

Estates leaving 10% or more of the "baseline amount" to qualifying charity are taxed at 36% rather than 40% on the chargeable estate, under IHTA 1984 s.7(4) and Sch 1A. On the Surrey-couple example, redirecting £200k+ of the chargeable estate to charity could trigger the 36% rate and save roughly £75k-£100k in IHT versus the 40% baseline, after netting the cost of the charitable gift itself. The lever is most attractive at the margin where a family is already philanthropically inclined.

Lever 6: BPR and APR portfolio restructuring

Business Property Relief and Agricultural Property Relief continue to apply to qualifying assets, but the FA 2026 combined £2.5m cap on 100% relief under IHTA 1984 s.124D as inserted by FA 2026 Sch 12 para 4 (with 50% relief above the cap, plus the trust anti-fragmentation framework) materially constrains the lever from 6 April 2026 onwards. BPR is not available on pure investment BTL portfolios per Pawson v HMRC [2013] UKUT 50 (TCC). Where a landlord has a genuine trading business alongside the rental portfolio (property development, qualifying FHL on a trading-line-passing basis, or a separate trading company), BPR planning may have a role. See our BPR planning pillar for the detail.

Lever 7: settled-property routes (trusts)

Lifetime CLT into a discretionary trust with s.260 holdover for the CGT is available but carries the trade-off: 20% entry charge over the NRB, up to 6% periodic charge every ten years, the GROB trap if the settlor wants to remain a beneficiary, and loss of RNRB on the gifted property (because RNRB requires the qualifying residential interest to be in the estate at death and closely-inherited). See our trust orientation pillar (sibling page in this batch) for the suited-vs-not-suited framing. The trust route is not a default response to the freeze and is suited only to substantial, multi-generational, advice-budgeted estates.

Lever 8: post-death deeds of variation

Under IHTA 1984 s.142 and TCGA 1992 s.62(6), beneficiaries can vary an inheritance within two years of death. The variation reads back for IHT and the redirection does not count as a market-value disposal for CGT. The DoV is the only mechanism that achieves both IHT savings and the CGT uplift simultaneously. Common uses: skip a generation to grandchildren; equalise between siblings; redirect to charity (triggering the Sch 1A 36% rate); redirect into a discretionary trust for the survivor's IHT benefit.

What the freeze does NOT change

Several things are worth saying clearly because the freeze has triggered a wave of poorly-targeted marketing content.

  • The freeze does not change the rates. 40% headline IHT, 36% reduced charity rate, 20% lifetime CLT rate. All unchanged.
  • The freeze does not change the £3,000 annual gifting exemption (s.19), the £250 small gifts exemption (s.20), the normal-expenditure-out-of-income exemption (s.21), or the marriage gifts (s.22). The exemptions remain available and remain useful for high-income donors who can document a habitual gifting pattern.
  • The freeze does not change the spouse exemption. Inter-spouse transfers under s.18 remain unlimited (subject to the post-FA-2025 long-term-residence test in cross-border cases).
  • The freeze does not change the CGT uplift on death. TCGA 1992 s.62 continues to wipe the deceased's accrued gain at probate value. This often weighs against lifetime gifting for appreciated property; the freeze does not alter the trade-off.
  • The freeze does not change BPR or APR qualification rules. The FA 2026 £2.5m cap on 100% relief (IHTA 1984 s.124D) is a separate, parallel reform. Both run in tandem.

The freeze is significant but it is one variable in a system of many. Planning that focuses on the freeze in isolation often produces poorly-targeted decisions, particularly around lifetime gifting where the CGT cost can swamp the IHT saving for appreciated property.

The freeze is the largest single inheritance tax policy change of the decade. It does not warrant a panic response. It warrants a measured estate-model refresh against the announced freeze schedule, with planning levers chosen for fit rather than for headline appeal. The cost of inaction grows steadily across the freeze horizon; the cost of the wrong action can be larger still.