Most of us assume inheritance tax is something that happens to other people or families with wealth, land, and complicated finances. We rarely picture it affecting ourselves. Yet with house prices where they are today, it’s surprisingly easy to cross the tax threshold without realising it. Own a typical family home, add in a lifetime of quiet savings and a modest pension, and your family could suddenly be facing a tax bill you never anticipated.

That’s where the nil rate band and residence nil rate band come in. These two allowances sit at the heart of the UK inheritance tax system, and together they decide how much of an estate can pass to loved ones before HMRC takes a share. Understand them properly and you can plan with confidence. Misunderstand them, or simply never get round to checking how they apply to your own situation, and your family could end up paying far more tax than necessary.

This guide is written for anyone thinking about their own estate, helping a parent with theirs, or acting as an executor after a death. You don’t need a background in tax or law to follow it. What you do need is a clear explanation of how the rules actually work, with real numbers and realistic examples, which is exactly what follows.

What is the Nil Rate Band?

The Nil Rate Band (NRB) is the standard tax-free threshold for UK Inheritance Tax, currently set at £325,000 per person through April 2031. Any part of an estate value above available allowances is generally taxed at a standard rate of 40%.

The nil rate band, usually shortened to NRB, is the amount that a person can leave behind on death without any inheritance tax being due. It’s the foundation of the whole system, and every estate benefits from it regardless of what it contains or who inherits it.

For the current tax year, the nil rate band stands at £325,000 per person. It has been frozen at this level since 2009, and following the Autumn Budget in November 2025, that freeze has been extended, with the threshold set to remain unchanged until April 2031. In practical terms, this means that as house prices and other asset values continue to rise, more estates will find themselves drawn into inheritance tax simply because the allowance hasn’t moved with them.

Anything left within the nil rate band is taxed at 0%. Anything above it, once other allowances and exemptions have been applied, is generally taxed at 40%. That’s a significant jump, which is exactly why understanding how the allowance works matters so much.

The nil rate band applies to the whole of a person’s estate, not just property. This includes:

• Cash in bank and building society accounts
• Investments such as shares, funds and bonds
• Property, whether a main residence, second home or buy-to-let
• Personal possessions, including cars, jewellery and valuable items
• Business assets, where certain reliefs don’t already apply

Everyone who dies domiciled in the UK, or with UK assets, has access to their own nil rate band. It doesn’t depend on marital status, age, or how the estate is left in a will. A single person leaving their entire estate to a friend has exactly the same £325,000 allowance as someone leaving everything to their spouse or children.

Example: Margaret dies with an estate worth £280,000, made up of savings and a small flat. Because this falls entirely within her nil rate band of £325,000, no inheritance tax is due at all. Her estate passes to her nephew without any deduction.

What is the Residence Nil Rate Band?

The Residence Nil Rate Band (RNRB) is an additional tax-free allowance of up to £175,000 per person when leaving a qualifying residential property to direct descendants (such as children or grandchildren).

The residence nil rate band, or RNRB, was introduced in April 2017 to address a specific concern: that ordinary family homes, particularly in areas where property prices had risen sharply, were pushing estates into inheritance tax territory even though the families involved were far from wealthy.

The RNRB provides an additional allowance, but unlike the standard nil rate band, it comes with conditions attached. It only applies where a qualifying home is left to direct descendants, and the amount available depends on the value of that property and the size of the estate as a whole.

For the current tax year, the RNRB is worth up to £175,000 per person. Combined with the standard nil rate band of £325,000, this gives an individual a potential total allowance of £500,000 before inheritance tax becomes payable, provided the conditions are met.

Who counts as a direct descendant

This is where confusion often creeps in. Direct descendants include:

• Children, whether biological or adopted
• Stepchildren
• Grandchildren and great-grandchildren
• The spouses or civil partners of any of the above, provided they haven’t since remarried following the descendant’s death

Direct descendants do not include nieces, nephews, siblings, or friends. If a home is left to anyone outside this group, the RNRB simply doesn’t apply to that gift, no matter how deserving the recipient might be.

What counts as a qualifying property

The property must have been the deceased’s residence at some point, though it doesn’t need to be their home at the time of death. This matters for people who have moved into care, sold their home to downsize, or relocated for other reasons, since a downsizing addition can preserve some or all of the RNRB that would otherwise have been lost. It doesn’t need to be the only property someone owned, and a holiday home or buy-to-let generally won’t qualify unless it was genuinely lived in as a residence.

Common misconceptions

A surprising number of people assume the RNRB is automatic, applying to every estate that includes a home. It isn’t. If a house is left to a sibling, a friend, or a charity rather than a direct descendant, the RNRB doesn’t apply to that gift. Others assume the full £175,000 is always available regardless of the property’s value, but if the home is worth less than the allowance, only the actual value of the qualifying interest can be used.

Key Differences Between NRB and RNRB

Feature	Nil Rate Band (NRB)	Residence Nil Rate Band (RNRB)
Purpose	General allowance covering the whole estate	Specific relief for passing on the family home
Current value	£325,000 per person	Up to £175,000 per person
Eligibility	Available to every estate	Only available where a qualifying home is left to direct descendants
Qualifying assets	Any asset in the estate	Only a residential property that was lived in by the deceased
Restrictions	None based on estate size	Tapers away for estates above £2 million
Who benefits	Everyone	Only those leaving a home to children, grandchildren or similar

In plain terms, the nil rate band is unconditional and flexible, while the residence nil rate band is generous but narrow. It rewards a specific set of circumstances, namely home ownership combined with children or grandchildren as beneficiaries, and it withdraws that reward as estates grow larger. Someone without children, or without a home to leave, will never benefit from the RNRB no matter how their estate is structured, which is an important point to bear in mind during planning.

How They Work Together

When both allowances apply in full, they combine to shelter a substantial amount from inheritance tax. For a single person leaving a qualifying home to direct descendants, the maximum combined allowance is £500,000: £325,000 from the standard nil rate band plus £175,000 from the residence nil rate band.

For married couples and civil partners, this can effectively double, since unused allowances transfer to the surviving spouse. That gives a potential combined allowance of £1 million on the second death, made up of £650,000 in transferred nil rate bands and £350,000 in transferred residence nil rate bands.

Example one, single homeowner: David is unmarried and dies leaving an estate worth £450,000, including a house worth £280,000 left to his daughter. His nil rate band covers £325,000, and his residence nil rate band covers the remaining £125,000 of tax free allowance he needs, well within the £175,000 available. No inheritance tax is due.

Example two, married couple, first death: Alan dies leaving his entire estate to his wife, Susan. Because transfers between spouses are exempt from inheritance tax regardless of value, no tax is due on his death, and none of his nil rate band or residence nil rate band is used. Both allowances are preserved for later transfer to Susan’s estate.

Example three, second death: Susan later dies with an estate worth £900,000, including the family home worth £400,000 left to their two children. Because Alan’s allowances passed to her in full, Susan’s estate benefits from a combined nil rate band of £650,000 and a combined residence nil rate band of £350,000, giving a total of £1 million in allowances. Her £900,000 estate falls entirely within this, so no inheritance tax is payable.

These examples show why understanding transferable allowances matters so much for married couples in particular. Getting the claim wrong, or failing to make it at all, can mean an estate paying tax that should never have been due.

Married Couples & Civil Partners

Transfers between spouses and civil partners are exempt from inheritance tax entirely, no matter how large the estate. This is one of the most valuable reliefs in the whole system, and it’s the reason many couples pay no tax at all on the first death, with any liability arising only when the second partner dies.

Because of this exemption, it’s common for the first spouse to leave everything to the survivor, meaning their nil rate band and residence nil rate band go unused at that point. The good news is that unused allowances aren’t lost. They can be claimed by the surviving spouse’s estate, effectively doubling what’s available when they later die.

This does mean that planning shouldn’t stop after the first death. Wills should be reviewed periodically to make sure they still reflect current circumstances, particularly following remarriage, changes in family relationships, or significant shifts in the value of an estate. A will written decades ago, before the RNRB existed, may not be structured in a way that takes full advantage of it.

Planning consideration: Some older wills include trust arrangements designed around outdated tax rules, and these can inadvertently prevent a home from passing directly to children, which is a requirement for the RNRB to apply. Anyone with a will drafted before 2017, or one that hasn’t been reviewed in many years, should have it checked. Refer our Estate Planning Services.

Transferable Allowances

Both the nil rate band and the residence nil rate band can be transferred between spouses and civil partners, but the transfer isn’t automatic. It has to be claimed by the executors of the second estate.

How the transfer works

The unused percentage, rather than a fixed amount, is what carries forward. If the first spouse used none of their nil rate band, 100% transfers to the survivor. If they used half, only the remaining 50% is available to transfer. This matters because nil rate band values can change between the two deaths, so working in percentages ensures the surviving estate benefits from whatever the current threshold happens to be.

The same principle applies to the residence nil rate band, with its own separate claim.

Deadlines and documentation

When applying for a Grant of Probate, executors will need to submit specific HMRC paperwork to make the transfer claim. The claim must generally be made within two years of the end of the month in which the second spouse died, though HMRC does have some discretion to accept later claims in appropriate circumstances. Executors will need:

• The deceased’s death certificate
• The marriage or civil partnership certificate
• Details of the first spouse’s estate and what allowances were used
• The relevant HMRC forms, typically IHT402 for the transferable nil rate band and IHT436 for the transferable residence nil rate band

Example: Peter’s first wife died in 2003, leaving her entire estate to him and using none of her nil rate band. When Peter dies many years later, his executors can claim 100% of his late wife’s nil rate band in addition to his own, provided they have the necessary paperwork to support the claim when applying for probate. Without this documentation, the claim can be delayed or challenged.

Tapering for Larger Estates

The residence nil rate band isn’t available without limit. For estates valued above £2 million, it begins to taper away, reducing by £1 for every £2 that the estate exceeds this threshold.

For a single individual, the RNRB is lost entirely once an estate reaches £2.35 million. For a surviving spouse or civil partner claiming a fully transferred RNRB (giving a total combined RNRB allowance of £350,000), the taper wipes out the allowance completely once the estate reaches £2.7 million.

This taper applies to the whole estate before reliefs like business property relief are deducted, which catches some people out. An estate that looks comfortably below £2 million after available reliefs may still have used the gross value for taper purposes, resulting in a reduced or lost RNRB.

Example: Richard’s estate is valued at £2.2 million. This is £200,000 over the £2 million threshold, so his residence nil rate band is reduced by £100,000 (that is, £1 for every £2 over the limit), leaving him with only £75,000 of RNRB rather than the full £175,000.

Planning consideration: For estates approaching the taper threshold, lifetime gifting, restructuring ownership of assets, or making use of trusts may help preserve some or all of the residence nil rate band. For estates approaching or exceeding £2 million, seeking specialist IHT advice for high-net-worth estates can help mitigate tapering and preserve your tax-free allowances.

Worked Examples

1. Single homeowner below the threshold. Janet, unmarried with no children, dies with an estate worth £310,000. Her home passes to a close friend rather than a direct descendant. Only the standard nil rate band applies, since the RNRB requires a direct descendant. Her estate falls within £325,000, so no tax is due.

2. Married couple, modest estate. Tom and Linda have a combined estate worth £550,000, including their home worth £300,000. Linda dies first, leaving everything to Tom, using none of her allowances. When Tom later dies leaving the estate to their children, he has his own £325,000 NRB and £175,000 RNRB, plus Linda’s transferred £325,000 NRB and £175,000 RNRB, giving £1 million in total allowances against an estate worth £550,000. No tax is due.

3. Widowed spouse with a substantial estate. Barbara, a widow, dies with an estate worth £1.2 million, including a home worth £500,000 left to her three children. Her late husband’s allowances transferred in full. Her combined NRB is £650,000 and her combined RNRB is £350,000 (though only £175,000 of RNRB is needed since her own share of the home’s value doesn’t require the full transferred amount, the rules cap what’s actually used against the property value). Her total allowance covers £1 million of her £1.2 million estate, leaving £200,000 taxable at 40%, an inheritance tax bill of £80,000.

4. Estate below the threshold. Harold dies with total assets of £180,000, entirely in savings and personal possessions, with no property. His nil rate band alone comfortably covers this. No RNRB is relevant since there’s no qualifying home, and no tax is due.

5. Estate above the taper threshold. Elizabeth dies with an estate worth £2.5 million, including a family home worth £600,000 left to her children. Because her estate exceeds £2.35 million as a single individual, her residence nil rate band is reduced to nil. She retains her standard £325,000 nil rate band, leaving £2.175 million taxable at 40%, a bill of £870,000.

6. Family with children, mid-sized estate. Michael and Sarah have a combined estate worth £700,000, including their home worth £350,000, left entirely to their two children on the second death. Between them, their combined allowances of up to £1 million comfortably exceed the estate value, meaning no inheritance tax is payable, provided both nil rate bands and residence nil rate bands are properly claimed.

Common Mistakes

• Assuming everyone receives the RNRB automatically. The RNRB only applies where a qualifying home passes to direct descendants. Estates without children, or where the home is left to someone else, won’t benefit from it at all.
• Misunderstanding who counts as a direct descendant. Nieces, nephews, siblings and friends don’t qualify, even if they’re the natural choice of beneficiary for someone without children of their own.
• Forgetting to claim transferable allowances. These aren’t applied automatically during probate. Executors need to actively make the claim using HMRC forms IHT402/IHT436, and missing the deadline can mean losing out on a valuable allowance.
• Overlooking the taper rules. Estates near or above £2 million need careful calculation, since the RNRB can shrink or disappear entirely, sometimes catching families by surprise when the estate includes valuable property or investments.
• Failing to update wills. Older wills, particularly those written before 2017 or structured around outdated trust arrangements, may not take advantage of the RNRB, or could even prevent it from applying. Reviewing a will every few years helps avoid this.
• Poor estate planning generally. Leaving matters until the last minute, failing to keep records of lifetime gifts, or overlooking strategies like setting up UK trust structures, can lead to unnecessary tax liabilities.

Frequently Asked Questions

Does everyone get the nil rate band?

Yes. Every individual has their own £325,000 nil rate band, regardless of marital status or how their estate is left.

Is the residence nil rate band automatic?

No. It only applies where a qualifying home is left to direct descendants, and the estate’s executors typically need to confirm this is the case when applying for probate.

Can I use my RNRB if I don’t own a home when I die?

In most cases, no, though the downsizing addition allows some or all of the allowance to be preserved if you sold or moved out of a qualifying home before death, provided other conditions are met.

What happens if my estate is worth more than £2 million?

Your residence nil rate band starts to taper, reducing by £1 for every £2 over the threshold. It disappears entirely at £2.35 million for a single estate, or £2.7 million for a surviving spouse with full transferred allowances.

Can unused allowances really be transferred between spouses?

Yes, both the nil rate band and the residence nil rate band can transfer, but the claim must be made by the executors of the second estate, usually within two years of the end of the month of death.

Do civil partners get the same treatment as married couples?

Yes, civil partners have identical rights to spouses under inheritance tax law, including the spouse exemption and transferable allowances.

What if I leave my home to a sibling rather than a child?

The residence nil rate band won’t apply, since siblings aren’t classed as direct descendants. Only your standard nil rate band would be available for that gift.

Do stepchildren count as direct descendants?

Yes, stepchildren are included in the definition, alongside biological children, adopted children, and grandchildren.

What rate is inheritance tax charged at?

The standard rate is 40% on the value of an estate above the available allowances, though a reduced rate of 36% can apply where at least 10% of the estate is left to charity.

Can gifts made during my lifetime affect my estate’s tax position?

Yes. Gifts made to individuals within seven years of death are classed as Potentially Exempt Transfers (PETs). They can be brought back into the estate for inheritance tax calculations if you die within seven years of making the gift.

Will inheritance tax rules change again soon?

From April 2027, most unused pension funds are due to be brought within the scope of inheritance tax for the first time, which will affect many estates that previously relied on pensions passing tax-free. This is a significant change and worth discussing with an adviser well before it takes effect.

Should I get professional advice for my own estate?

If your estate is close to or above the available allowances, includes business assets, involves blended families, or you’re unsure how the transferable allowances apply to your circumstances, speaking to a solicitor or financial adviser is generally worthwhile.

What documents should executors keep?

Death certificates, marriage certificates, wills, and records of any lifetime gifts (PETs) should all be kept, as these are needed when applying for probate to support claims for transferable allowances.

Bringing It All Together

Inheritance tax may apply whenever an estate exceeds the allowances available to it, but for a great many families, particularly married couples with a home to leave to their children, the combination of the nil rate band and residence nil rate band means no tax is due at all. The two allowances work differently: one is unconditional and covers the whole estate, the other is generous but depends on specific circumstances involving property and descendants.

Getting the most from these allowances often comes down to details that are easy to overlook: keeping wills up to date, understanding exactly who counts as a direct descendant, claiming transferable allowances correctly during probate, and being alert to how the taper affects larger estates. None of this needs to be complicated, but it does benefit from a bit of care.

Where an estate is approaching the thresholds discussed here, where family circumstances are more complex than a straightforward marriage and children, or where business or agricultural assets are involved, professional advice from a solicitor or financial adviser is generally money well spent.

Disclaimer: This article is provided for informational and educational purposes only and does not constitute formal tax, legal, or financial advice. Inheritance tax rules depend heavily on individual circumstances and may change over time. Always consult a qualified solicitor or FCA-regulated financial adviser before making decisions regarding your estate.