Kemi Badenoch Inheritance Tax Policy: Family Home Exemption Sparks £11bn Cost Row

Conservative Party leader Kemi Badenoch has promised to abolish inheritance tax on family homes and allow married couples to pass on a further £1 million tax-free if the Conservatives return to government, triggering a fresh political debate over property wealth, taxation and the future of Britain’s housing market.

The announcement, made during her keynote speech at the Conservative Party conference in Birmingham on 7 October 2026, represents one of the party’s most significant tax-cutting commitments ahead of the next general election.

However, the proposal is already facing scrutiny over its potential cost. While the Conservatives estimate that the reform would reduce tax revenues by approximately £6 billion annually, subsequent analysis by tax specialists suggests the annual cost could approach £11 billion.

The disagreement has placed Badenoch’s inheritance tax policy at the centre of a wider debate about whether reducing taxes on inherited property would support economic growth or disproportionately benefit wealthy homeowners, particularly in London and the South East.

What Has Kemi Badenoch Proposed for Inheritance Tax?

Under the Conservative proposal, a person’s main family home could be passed to children or grandchildren without inheritance tax, regardless of its value.

The party would also increase the standard inheritance tax-free threshold from £325,000 to £500,000 per individual, replacing the existing £175,000 residence nil-rate band with a broader allowance.

This would enable married couples and civil partners, where the relevant allowances are transferable, to leave their qualifying main home to direct descendants and pass on a further £1 million in other assets without an inheritance tax liability.

Speaking about the proposals, Badenoch said:

“That is why the next Conservative government will legislate so nobody will ever pay Inheritance Tax on their family home.”

The Conservative leader described homeownership as central to her party’s economic philosophy, arguing that families who work hard, save and purchase property should be able to transfer their wealth to future generations.

She also confirmed that her longer-term ambition remains the complete abolition of inheritance tax once the public finances permit it.

Shadow Chancellor Andrew Griffith supported the announcement, arguing that inheritance tax penalises families who accumulate assets over their working lives.

The Conservatives say they would finance their tax commitments through a wider programme of public spending reductions, including welfare reforms. Their conference savings plan identifies £71 billion in proposed savings, with half allocated towards reducing the deficit.

However, these are commitments by the opposition rather than changes to current legislation. Inheritance tax rules have not changed as a result of Badenoch’s announcement.

At present, HMRC generally charges inheritance tax at 40% on the taxable portion of an estate above the available allowances and after exemptions and reliefs.

The standard nil-rate band remains £325,000, while a qualifying residence passed to direct descendants can provide an additional £175,000 allowance. This means some married couples can already transfer up to £1 million tax-free under existing rules.

The full position depends on the estate’s circumstances, including whether allowances have been transferred from a deceased spouse and whether the residence allowance is reduced for estates exceeding £2 million.

These distinctions are particularly important when assessing how much inheritance tax families currently pay and how Badenoch’s proposal would change their liabilities.

Experts Warn Wealthy London Homeowners Could Benefit Most

The proposed exemption has received a mixed response from economists, with particular concern about its distributional impact and potential consequences for London’s property market.

Stuart Adam, Senior Economist at the Institute for Fiscal Studies (IFS), said in his analysis published on 7 October:

“The biggest beneficiaries would be those with the highest wealth and the most valuable homes.”

Adam explained that removing inheritance tax from principal residences while maintaining the levy on other assets could encourage wealthy households to retain expensive properties or invest more money in housing.

Rather than downsizing during retirement, some homeowners might have a stronger financial incentive to remain in large family properties, potentially restricting the supply of homes available to younger buyers.

The concern is especially relevant in London, where high property values can result in significant inheritance tax liabilities even when much of an estate’s wealth is concentrated in a single residence.

Further analysis by tax lawyer Dan Neidle, founder of Tax Policy Associates, suggests that the richest 20% of pensioner households could receive approximately 90% of the total benefit from the Conservative reforms.

His modelling also estimates that London and the South East, despite accounting for roughly a quarter of Britain’s pensioner households, could receive around 70% of the tax reduction.

These figures are independent model estimates rather than established outcomes, but they highlight the potential geographical concentration of the proposed benefits.

Paul Johnson, former director of the Institute for Fiscal Studies, also criticised the proposed home exemption during an interview with Sky News.

“I think it’s a very, very bad policy,” Johnson said, arguing that it could discourage older homeowners from moving into smaller, more appropriate properties.

His comments reflect a wider concern among housing economists that generous property-specific tax exemptions can influence decisions about when to sell, downsize or transfer assets.

For families navigating inheritance following the death of both parents, the existing arrangements for inheritance tax when the second parent dies remain particularly relevant while the proposed reforms are not in force.

New Analysis Challenges the Conservatives’ £6bn Estimate

The financial implications of the proposal have become an increasingly contentious issue following competing economic assessments published after Badenoch’s speech.

Research by Oxford Economics, commissioned by the centre-right think tank Onward, estimated that combining a full inheritance tax exemption for qualifying main residences with a £500,000 standard allowance would cost approximately £6 billion annually by 2029/30.

Its modelling suggested inheritance tax liabilities could fall from £12.6 billion under existing policy assumptions to approximately £6.6 billion.

The number of estates liable for inheritance tax could also decline from around 52,100 to 21,500, a reduction of approximately 59%.

However, a separate assessment published by Dan Neidle on 8 October challenged those figures.

Tax Policy Associates estimated an annual cost of approximately £7.6 billion to £10.8 billion after accounting for potential changes in homeowner behaviour.

The analysis suggests some wealthy households might retain more expensive properties, avoid downsizing or shift money from savings and investments into their principal residence to reduce future inheritance tax bills.

Neidle’s modelling estimates that between £60 billion and £110 billion in financial assets could potentially be redirected towards housing under the assumptions used.

It also suggests the number of properties valued above £1 million coming onto the market in London and the South East could fall by approximately 3% to 6% annually.

Neidle concluded:

“But if the priority is growth, then inheritance tax is the wrong tax to cut.”

Oxford Economics responded on 9 October, defending its modelling approach and acknowledging that different assumptions can produce materially different tax costings. It said its initial estimate of the tax cut before behavioural adjustments was £6.2 billion for 2029/30.

The disagreement illustrates the uncertainty surrounding the long-term fiscal impact of a reform that could materially alter incentives in Britain’s housing market.

The figures remain forecasts and should not be treated as a final independently verified cost of the policy.

Meanwhile, the IFS has highlighted how inheritance tax is expected to affect a growing proportion of estates under current rules.

According to its October assessment, approximately 4.6% of estates were liable in 2023/24. That share is forecast to reach 5.5% in 2026/27 and potentially 9.5% by 2030/31, although future house prices and government policy could significantly alter those projections.

Frozen inheritance tax thresholds, rising property values and the planned inclusion of most unused pension funds within estates from April 2027 are among the factors adding pressure to the existing system.

Labour has criticised Badenoch’s proposals for concentrating tax relief among wealthier households, while the Conservatives maintain that families should be able to pass on property without facing an additional tax burden on death.

The central disagreement is increasingly about who would benefit, how the reform would affect housing decisions and whether substantial reductions in inheritance tax revenue can be justified alongside competing demands on public services.

For London homeowners, the announcement offers the prospect of significant future inheritance tax savings, particularly for families holding high-value properties over several generations.

But the practical benefits remain entirely dependent on a future Conservative government implementing the proposals and Parliament approving the necessary legislation.

With the party’s £6 billion costing now disputed and economists warning about possible distortions in the housing market, Kemi Badenoch’s inheritance tax policy is likely to remain an important test of the Conservatives’ wider economic strategy.

For now, families planning estates, property transfers or inheritances must continue to use the inheritance tax rules currently in force rather than the opposition’s proposed exemptions.