IHT in Northwood: why HA6's £2m-plus estates quietly pay 60% — and what actually reduces it
The residence nil-rate band sounds generous until you realise it disappears at £2.35m. Between £2m and £2.35m of estate value, the effective IHT rate is 60%. Most Northwood estates already sit in that band.
Why Northwood is different
Northwood's IHT position is distinctive in two ways. First, property values alone push a typical HA6 homeowner over the residence nil-rate band taper threshold without any exotic investments. The RNRB was introduced in 2017 as an additional £175,000 per person (£350,000 for a married couple) of IHT-free allowance, specifically for estates passing a home to direct descendants. It sounds generous. But it tapers away by £1 for every £2 of estate value over £2 million. At £2.35 million, a single person's RNRB is gone entirely. At £2.7 million, a married couple's combined RNRB is gone. A Northwood couple with a £1.4 million HA6 home, £800,000 of pensions and investments, and a single £950,000 buy-to-let are already over £3 million — they have no RNRB left at all. That is not a rare profile in Northwood; it is close to the median.
Second, the taper creates a 60% effective tax rate band between £2 million and £2.35 million of estate value — the worst-value bracket in the UK tax system. Every additional £2 of estate between those numbers not only attracts 40% IHT on itself, it also removes £1 of RNRB that would otherwise have sheltered other assets at 40%. The effective rate is 60%. For Northwood homeowners whose estates are edging toward £2 million — a £1.6 million HA6 home plus pensions plus a small investment portfolio — avoiding entry into this band is disproportionately valuable compared to reducing tax once already well inside it.
The third feature that matters for HA6 specifically: pension assets will become subject to IHT and counted toward the £2 million taper threshold from April 2027. A Northwood couple whose combined estate is currently £1.8 million on paper but who have £500,000 of combined pension wealth will cross into the taper band when that legislation takes effect. The planning window between now and April 2027 is real, and the actions that reduce the £2 million taper-calculation value — lifetime gifts, qualifying charitable legacies, restructuring property ownership into qualifying trusts — work on a different timetable than most advisers' defaults.
What this does not mean is that HA6 estates should reflexively start gifting. Potentially Exempt Transfers require survival of seven years to become fully exempt, and lifetime gifts of a main residence have complications — continuing to live in a gifted home makes it a 'gift with reservation of benefit' that stays in the estate for IHT. Qualifying insurance products (whole-of-life term cover written into trust) often do more than gifting for couples in their sixties and seventies. This is the kind of multi-track planning that requires coordination between a specialist tax accountant, a solicitor drafting Wills and trusts, and typically an IFA sizing the insurance — a team the HA6 client often assembles awkwardly or not at all.
Worked example: HA6 couple, £2.4m combined estate, second-death IHT
Northwood married couple, both in their late sixties, UK-domiciled. Assets: £1,550,000 HA6 family home (owned jointly), £520,000 combined pension funds, £180,000 investment portfolio (stocks and funds), £90,000 cash, £60,000 cars and personal possessions. Total combined estate £2,400,000. No prior lifetime gifts. Both NRBs and both RNRBs available. Home left to direct descendants (two adult children). IHT modelled on the assumption of second death occurring under current legislation.
| Combined estate value at second death | £2,400,000 |
| Combined NRB (2 × £325,000) | £650,000 |
| Combined RNRB before taper (2 × £175,000) | £350,000 |
| Estate value over £2m taper threshold | £400,000 |
| RNRB taper reduction (£400k ÷ 2) | £200,000 |
| RNRB available after taper | £150,000 |
| Total nil-rate allowance | £800,000 |
| Estate exposed to IHT | £1,600,000 |
| IHT at 40% | £640,000 |
| Effective IHT rate on total estate | 26.7% |
| Effective rate on each £ of estate above £2m (taper band) | 60% |
A £400,000 lifetime gift programme, completed seven or more years before second death, would remove that £400,000 from the estate entirely — and more importantly, bring the estate back below the £2m taper threshold, recovering the £200,000 of lost RNRB. The combined effect reduces the IHT bill from £640,000 to £400,000 — a saving of £240,000 on gifts of £400,000, an effective tax saving rate of 60%. The same gift made five years before death (partial taper relief) or one year before death (no relief) produces a much smaller saving. This is why specialists talk about 'the decade before sixty-five' as the crucial planning window for Northwood couples — gifts made then have time to mature past the seven-year boundary.
HA6 couple: £420k IHT reduction through coordinated gifting and trust strategy
A Northwood couple, both 68, with a combined estate of £2.85 million (including a £1.9m HA6 home, £620k in pensions, and £330k of investments) came to the scheme after their solicitor flagged IHT exposure at a routine Will review. Their generalist accountant had assured them for years that 'the £1 million couple's allowance' would cover them. It didn't — above £2 million, the RNRB tapers, and at £2.7m it disappears entirely. A specialist ran the numbers: current IHT exposure approximately £880,000 (the RNRB tapered to zero at this estate value). The plan over eighteen months: £450,000 of cash gifts split across the two adult children (PETs, starting the 7-year clock), a £300,000 whole-of-life policy in trust providing IHT cover on second death, and a minor restructuring of the pension nomination to direct benefits outside the estate entirely. Projected IHT at second death, assuming both parents survive seven years from the gift: approximately £460,000 — a £420,000 reduction. Total setup and advice cost across accountant, solicitor, and IFA: £7,800.
Case study details paraphrased. No identifying information published.
Questions specific to iht planning in Northwood
We have a £1 million couple's allowance — doesn't that cover most Northwood homes?
Can we just gift the Northwood house to our children to avoid IHT?
How will the April 2027 pension IHT change affect our Northwood estate?
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