How inheritance tax applies to UK property and estates in 2026: thresholds, the residence nil-rate band, and how mortgage and estate structuring can affect an IHT bill.
The conversation tends to go one of two ways. Either a client tells us they’re not worried about inheritance tax because they’ve “sorted it,” and it turns out they sorted it ten years ago before their estate doubled in value. Or they’ve never thought about it at all, because they assumed IHT was something that happened to other people — wealthier people, better-prepared people.
The reality is that rising property values and a decade-and-a-half of frozen thresholds have brought a lot of ordinary estates into IHT territory. In the 2024/25 tax year, HMRC collected a record £8.2 billion in inheritance tax receipts, up from £7.5 billion the year before. (Source: HMRC / IFA Magazine, 2025.) That number is heading in one direction, and it’s not down.
If you own property, whether a family home, a buy-to-let portfolio, or both this guide sets out how IHT applies in 2026, what’s changed, and where the interaction between property ownership and estate planning becomes particularly important.
The basics: how IHT works in 2026
Inheritance tax is charged at 40% on the value of an estate above the available tax-free threshold. The standard nil-rate band (NRB) is £325,000 per person a figure that hasn’t moved since April 2009 and is now frozen until April 2031 under the 2024 Autumn Budget.
On top of the NRB sits the residence nil-rate band (RNRB), worth a further £175,000 per person, but only where a qualifying residential property is left to direct descendants’ children, stepchildren, grandchildren or adopted children. Nieces, nephews, and unmarried partners do not qualify.
For married couples and civil partners, any unused allowances can be transferred to the surviving spouse, meaning a couple can effectively shelter up to £1 million from IHT before a penny of tax is due: two NRBs of £325,000 each, plus two RNRBs of £175,000 each.
One important caveat on the RNRB: it tapers away at a rate of £1 for every £2 by which the net estate exceeds £2 million. For larger estates particularly those built on appreciating London property this taper can quietly wipe out the residence relief entirely.
A simple worked example
| Total estate value | £1,800,000 |
| Less: combined NRB (couple) | −£650,000 |
| Less: combined RNRB (home left to children) | −£350,000 |
| Taxable estate | £800,000 |
| IHT at 40% | £320,000 |
That’s a substantial liability and it’s arrived at before any complexity is introduced.
How property is valued for IHT
Property is included in an estate at its open market value at the date of death: what it would reasonably fetch between a willing buyer and a willing seller. For most residential properties that means instructing a surveyor, and HMRC has become significantly more active in challenging valuations it considers too low. Referrals from HMRC to the Valuation Office Agency rose by 23.5% between the year to September 2024 and the year to September 2025. (Source: MoneyWeek / HMRC data.) For any property worth £250,000 or more or where the IHT position is borderline a RICS red-book valuation is worth commissioning rather than relying on an estate agent’s estimate.
For jointly owned property, there can be a valuation discount to reflect the difficulty of selling a share rather than the whole typically 10–15%, depending on the circumstances, though it does not apply between spouses.
Buy-to-let portfolios
A BTL portfolio is included in the estate at the full open market value of each property. There is no Business Property Relief (BPR) available on rental property: HMRC treats a letting portfolio as an investment business rather than a trading business, so the valuable 100% BPR relief that applies to some other business assets simply doesn’t apply here. This is one of the starkest IHT traps for landlords who have spent decades building a portfolio and have never given serious thought to what happens on death.
Where mortgages and lending structures come in
Outstanding mortgage debt can be deducted from the value of the estate before IHT is calculated. In practical terms, a buy-to-let property worth £600,000 with £200,000 still owed on the mortgage contributes £400,000 to the taxable estate, not £600,000. What’s less well understood is how the structure of that debt can interact with planning.
Some landlords have explored interest-only mortgages as a deliberate estate planning tool — keeping the loan balance high to reduce the net estate value. This can work, but HMRC applies anti-avoidance rules where liabilities are seen to have been arranged specifically to manufacture a tax advantage, so the commercial rationale matters. It’s not a strategy to implement without proper advice.
Holding property within a limited company adds further layers of complexity. Company shares may qualify for BPR in some circumstances though the rules here are nuanced and turn on the nature of the business so this is an area where the interaction between ownership structure, IHT planning, and mortgage affordability genuinely requires specialist input.
One change worth noting: from April 2027, undrawn pension funds will be brought within the IHT net for the first time. HMRC estimates that around 10,500 additional estates will face an IHT charge as a result, and approximately 38,500 estates will pay more than they would have previously. (Source: HMRC, 2024 Autumn Budget.) For clients who have historically held significant pension wealth alongside property, the combined picture looks meaningfully different to how it looked even two years ago.
When low yield meets a high IHT bill
Prime central London property often delivers modest income yields of 2–3%, with the investment case resting on long-term capital growth. That strategy works well during a lifetime. On death, however, it can leave beneficiaries facing a very large IHT bill on a portfolio that produces relatively little rental income which means either selling assets to fund the tax or borrowing against them.
This is a structural risk that a lot of portfolio landlords haven’t modelled. The question isn’t just what the estate is worth at death; it’s whether the beneficiaries can afford to keep it.
What can actually be done?
This guide doesn’t set out to provide personal tax advice. IHT planning is genuinely complex, turns on individual circumstances, and requires input from both a solicitor and a qualified financial adviser. What we can say is that there are legitimate planning routes worth exploring with the right professionals.
Gifting assets during your lifetime can reduce the taxable estate, provided you survive seven years after the gift the so-called seven-year rule. Some gifts attract taper relief if you die between three and seven years after making them. Trusts can hold property outside of the estate in certain circumstances, though the rules are detailed and the correct structure matters. Life insurance written in trust specifically to cover an anticipated IHT liability is a straightforward and often underused solution that doesn’t require you to give anything away.
For property owners with larger estates, the sooner these conversations happen, the more options are available. The advice we give our clients is not to wait for a trigger event. An unexpected health diagnosis, a marriage breakdown, or a sharp rise in property values can all make planning harder at exactly the wrong moment.
A note on the 2026 landscape
The freeze on both the NRB and RNRB until 2031 combined with continued house price growth in most parts of the country means the number of estates caught by IHT will keep rising. The OBR projects that IHT receipts will exceed £9 billion annually within the next few years, driven almost entirely by fiscal drag rather than any change in rates.
For anyone who owns property, this is no longer a niche concern. It’s increasingly a mainstream financial planning issue that deserves the same attention as a pension or mortgage review.
Frequently Asked Questions
What is inheritance tax and when is it charged?
Inheritance tax is a tax on the estate of someone who has died. It’s charged at 40% on the value of the estate above the available nil-rate bands. The estate pays the tax before assets are distributed to beneficiaries which means liquid assets (or life insurance) need to be available to meet the bill.
What is the inheritance tax threshold in 2026?
The standard nil-rate band is £325,000 per person. If you’re leaving a residential property to direct descendants, you can add the residence nil-rate band of £175,000, giving £500,000 per individual. Married couples and civil partners can combine their allowances for a potential combined threshold of £1 million. Both bands are frozen until April 2031.
Is my home included in my estate for IHT?
Yes. Your main residence is included at open market value, less any outstanding mortgage balance. If you leave it to direct descendants, you may be able to use the residence nil-rate band to reduce the taxable value but check whether the RNRB taper applies if your estate exceeds £2 million.
Does IHT apply to buy-to-let properties?
Yes. BTL properties form part of the estate at their open market value, less outstanding mortgage debt. Business Property Relief is not available on standard rental portfolios, as HMRC treats them as investment businesses rather than trading businesses.
Can I reduce my estate’s IHT by leaving a mortgage in place?
Outstanding mortgage debt is deductible from the estate value for IHT purposes, which reduces the taxable amount. However, arrangements designed purely to manufacture a tax advantage rather than for genuine commercial reasons can be challenged by HMRC under anti-avoidance provisions.
What is the residence nil-rate band (RNRB) and who qualifies?
The RNRB is an additional £175,000 allowance per person for estates that include a qualifying residential property left to direct descendants. It tapers away by £1 for every £2 by which the net estate exceeds £2 million.
What happens to IHT when a spouse dies?
The estate of the first spouse to die typically passes to the survivor free of IHT under the spousal exemption. Any unused nil-rate band and RNRB from the first death is transferable to the surviving spouse’s estate up to doubling the available allowances.
Will pension funds be subject to IHT from 2027?
From April 2027, undrawn pension funds and death benefits will generally be included in an estate for IHT purposes. HMRC estimates that around 38,500 existing estates will pay more IHT as a result. Anyone with significant pension wealth alongside property assets should review their overall estate position with an adviser.
How does HMRC value property for IHT?
Property is valued at open market value at the date of death. HMRC has significantly increased its scrutiny of property valuations in IHT returns, with referrals to the Valuation Office Agency rising by 23.5% in 2025. For higher-value properties or borderline cases, a RICS red-book valuation is advisable.
When should I start thinking about IHT planning?
The earlier the better. Most IHT planning strategies: gifting, trusts, life insurance in trust are more effective and more flexible when implemented early, before health or family circumstances change. If you own property worth significantly more than the nil-rate bands, it’s worth having the conversation with a solicitor and financial adviser rather than leaving it for another year.
Nothing in this article constitutes financial, legal, or tax advice. IHT rules are complex and depend on individual circumstances. Please speak with a qualified solicitor, tax adviser, and financial planner before making any decisions about your estate.
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