Badenoch’s inheritance tax plan: proposal and estimated cost

The Conservatives say the plan would cost £6bn a year, but independent modelling estimates a higher bill once possible changes in behaviour are included.

MoneyOctober 11, 20264 min readHow Sureno writes this

The short version

Badenoch’s Conservatives propose excluding family homes from inheritance tax and raising the tax-free allowance to £500,000 per person. ¹
The party says the change would cost £6bn a year; Tax Policy Associates estimates £7.6bn to £10.8bn, while its article headline gives a rounded range of £7.7bn to £10.9bn. ¹
The higher estimate allows for possible changes in behaviour, including moving money from investments into a home to reduce a future tax bill. ¹
Tax Policy Associates estimates around 90% of the tax reduction would go to the wealthiest fifth of pensioner households. ¹

What is Badenoch proposing on inheritance tax?

The Conservative proposal has two parts: exempt family homes from inheritance tax and increase the tax-free allowance to £500,000 per person. Inheritance tax is charged on some estates—the money and property left behind when someone dies. ¹

The available source describes this as a Conservative Party proposal. It does not give a full policy document, detailed rules for what qualifies as a family home, or a timetable for introducing the change.

How much could the inheritance tax cut cost?

The Conservatives put the annual cost at £6bn. Tax Policy Associates estimates a cost between £7.6bn and £10.8bn a year after allowing for possible taxpayer responses; the article headline rounds this to £7.7bn–£10.9bn. ¹

The higher estimate is a model, not a confirmed bill. It depends partly on how people might adjust their finances if the proposal became law. The source does not give enough information to treat any one figure as certain.

Why do the estimates differ?

The main difference is whether the calculation accounts for people changing how they hold their wealth. Tax Policy Associates suggests someone could sell investments and put the money into a home, because a home might receive more favourable inheritance tax treatment under the plan. ¹

The group estimates the policy could move £60bn–£110bn from savings and investments into housing. It also estimates a possible annual reduction of 3%–6% in the number of homes worth more than £1m coming onto the market in London and the South East. These are projections, not observed outcomes. ¹

Who might benefit most from the change?

Tax Policy Associates estimates that around 90% of the tax reduction would go to the wealthiest fifth of pensioner households. ¹ This is an estimate about how the proposed tax cut might be distributed, not a claim that every household in that group would benefit equally.

The Guardian’s commentary also argues that wealthy households would be the main beneficiaries. It notes that inheritance tax is politically unpopular even among people who may not owe it. ² This is commentary on the policy’s politics and likely effects, not a separate cost estimate.

What could the proposal mean for families and the economy?

For a family with a valuable home, an exemption could reduce inheritance tax due on an estate, depending on the final rules. The sources do not explain how the exemption would apply to different ownership or family situations, so they cannot show the precise effect on an individual household.

Tax Policy Associates’ main wider concern is that the rules could lead people to hold more wealth in housing and less in savings and investments. It says this could also affect the number of expensive homes offered for sale in London and the South East. ¹ Both effects are forecasts.

What remains uncertain about the plan?

The sources give a broad description and differing cost figures, but not the full policy design. They do not establish how the home exemption would be defined, when a change might begin, or whether the proposal would be altered.

The annual cost is uncertain because it depends on assumptions about how taxpayers respond. The estimates should be read as projections, not as a final government costing or a guaranteed amount of public spending. ¹

What we don't know yet

How the proposal would define a family home and handle different ownership or household arrangements.
Whether the Conservatives would publish more detail, including a timetable or updated cost estimate.
How extensively people would change their financial choices in response to the proposed rules.
What the annual cost would be if the policy were implemented.

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Questions people ask

Would Badenoch abolish inheritance tax on family homes?

The Conservative proposal is to exempt family homes from inheritance tax and raise the tax-free allowance to £500,000 per person. The available source does not set out the detailed rules for the exemption. ¹

How much would Badenoch’s inheritance tax plan cost?

The Conservatives say it would cost £6bn a year. Tax Policy Associates estimates £7.6bn to £10.8bn a year when possible changes in behaviour are included; its article headline rounds the range to £7.7bn–£10.9bn. ¹

Why could the inheritance tax plan cost more than £6bn?

Tax Policy Associates says people might transfer wealth from investments into housing to reduce a future inheritance tax bill. Its estimate accounts for this possible response, while the party’s stated figure is £6bn a year. ¹

Who would benefit most from Badenoch’s inheritance tax cut?

Tax Policy Associates estimates that around 90% of the tax reduction would go to the wealthiest fifth of pensioner households. This is a modelled estimate of how the proposed cut might be distributed, not a certainty about any individual household. ¹

Could the plan affect the housing market?

Tax Policy Associates estimates that the proposal could move £60bn–£110bn from savings and investments into housing. It also projects fewer homes worth more than £1m being offered for sale each year in London and the South East, but these are modelled effects rather than established outcomes. ¹

Sources

Tory IHT cut could cost £11bn - almost twice the advertised price — Tax Policy Associates, 2026-10-08
Badenoch’s inheritance tax gambit makes no economic sense | Heather Stewart — the Guardian, 2026-10-07

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