Residence Nil Rate Band: RNRB rules and £2 million taper explained

The Residence Nil Rate Band (RNRB) is an additional Inheritance Tax allowance that can apply when a qualifying home is passed to direct descendants. For 2026/27, the maximum RNRB remains £175,000 per individual, and the allowance is currently frozen at this level until 5 April 2030.

The RNRB operates alongside the standard Inheritance Tax nil rate band, but it has its own eligibility conditions. Simply owning a home does not automatically entitle an estate to the additional allowance. The type of property, who inherits it, the value passing to direct descendants and the overall size of the estate can all affect the amount available.

The Residence Nil Rate Band threshold is particularly important for families with substantial property wealth. Estates exceeding £2 million can begin to lose the allowance through the RNRB taper, potentially removing it completely for sufficiently large estates.

This guide explains how the RNRB works, who can qualify, how unused allowances can transfer between spouses and civil partners, what happens when an estate exceeds £2 million and how downsizing or selling a former home can affect the available Inheritance Tax residence allowance. These allowances sit within the wider tax planning framework explained in our ultimate guide to personal tax in the UK.

What is the Residence Nil Rate Band?

The Residence Nil Rate Band is an additional Inheritance Tax allowance available in qualifying circumstances where a residential interest is inherited by direct descendants.

For 2026/27, the maximum RNRB is £175,000 per person.

The allowance is separate from the ordinary Inheritance Tax nil rate band. Where both are fully available, they can work together to increase the amount of an estate that can potentially pass without an Inheritance Tax charge.

However, unlike the standard nil rate band, the RNRB is specifically linked to qualifying residential property and how that property is inherited.

How the RNRB works alongside the Inheritance Tax nil rate band

The standard Inheritance Tax nil rate band and the RNRB are separate allowances.

The standard nil rate band can generally be applied against the taxable estate without requiring a family home to pass to a particular beneficiary. The RNRB has additional conditions relating to residential property and direct descendants.

For an individual who qualifies for both allowances, the RNRB can therefore provide additional protection beyond the standard nil rate band.

Married couples and civil partners may also be able to transfer unused percentages of both allowances to the surviving spouse or civil partner’s estate. This is why some qualifying estates can ultimately benefit from substantially higher combined allowances.

The detailed calculation of the overall Inheritance Tax threshold is separate from determining whether an estate qualifies for the Residence Nil Rate Band itself.

Who qualifies for the Residence Nil Rate Band?

Broadly, the RNRB can apply where a person dies and a qualifying residential interest is closely inherited by one or more direct descendants.

Several conditions therefore need to be considered:

• The deceased must have had a qualifying residential interest or qualify under the downsizing provisions.
• The residence must pass in a way that satisfies the closely inherited requirement.
• The beneficiary must fall within the definition of a direct descendant.
• The amount claimed must not exceed the relevant limits.
• The allowance may be reduced where the overall estate exceeds the £2 million taper threshold.

The availability of the allowance should therefore be established from the facts of the estate rather than assumed simply because the deceased owned a house.

Which properties can qualify for the RNRB?

A qualifying residential interest is broadly an interest in a dwelling that has been the deceased’s residence at some point during their ownership.

The property does not necessarily need to have been occupied as the deceased’s home immediately before death.

For example, a person may have moved into residential care while continuing to own their former home. Depending on the circumstances, the property may still be capable of qualifying.

Where the deceased owned more than one property that had been used as a residence, the personal representatives may need to determine which qualifying residential interest should be used for the RNRB claim.

Buy-to-let properties that were never occupied as the deceased’s residence do not generally qualify merely because they are residential property. The question of who can claim the IHT residence nil rate band therefore depends as much on how a property was used as on its type.

Who counts as a direct descendant?

The Residence Nil Rate Band generally requires the qualifying residential interest to be inherited by direct descendants.

This category can include:

• Children.
• Grandchildren and other lineal descendants.
• Stepchildren.
• Adopted children.
• Foster children in qualifying circumstances.
• Certain children for whom the deceased acted as guardian.

Certain spouses, civil partners, widows and widowers of direct descendants can also fall within the rules where the statutory conditions are satisfied.

By contrast, leaving a home to other relatives such as a sibling, nephew or niece does not normally satisfy the direct descendant requirement simply because that person is a close family member.

How much Residence Nil Rate Band can be claimed?

The maximum Inheritance Tax residence allowance is £175,000 per individual for 2026/27, but this does not mean every qualifying estate automatically receives the full amount. Understanding how inheritance and tax interact more broadly helps put this specific allowance into context alongside the estate’s other reliefs and exemptions.

The actual RNRB can be restricted by factors including:

• The value of the qualifying residential interest.
• The amount of that interest passing to direct descendants.
• The size of the overall estate.
• Whether the deceased had previously downsized or disposed of a qualifying residence.

For example, where the qualifying residential interest passing appropriately is worth less than the maximum RNRB, the available allowance can be limited accordingly.

Transferring unused Residence Nil Rate Band between spouses

Where a spouse or civil partner dies without using all of their available RNRB, the unused percentage may generally be transferred to the estate of the surviving spouse or civil partner.

This can be particularly relevant where the first spouse leaves the family home to the surviving spouse. A transfer between spouses or civil partners is generally covered by the spouse exemption, meaning the first estate may not need to use its RNRB.

When the survivor later dies and leaves a qualifying residence to direct descendants, their personal representatives may potentially claim both the survivor’s own RNRB and the unused percentage transferred from the first spouse or civil partner.

The calculation is based on the unused percentage rather than simply carrying forward the original cash value of the allowance.

Does unused RNRB transfer automatically?

The transferable Residence Nil Rate Band should not simply be assumed to apply automatically when the surviving spouse or civil partner dies.

The personal representatives normally need to establish the unused percentage from the first death and make the appropriate claim as part of administering the second estate.

Keeping documentation from the first estate can therefore be valuable.

This may include:

• The deceased’s will.
• Probate documentation.
• Details of the first estate.
• Records showing how the family home passed.
• Previous Inheritance Tax returns and calculations.

These documents may be needed many years after the first death, so retaining them with wider estate planning records can make a future claim easier to support. The same principle applies when transferring the nil rate band for Inheritance Tax more generally, since both claims rely on accurate records from the first estate.

How the £2 million RNRB taper works

The £2 million taper is one of the most important restrictions affecting the Residence Nil Rate Band threshold.

Where an estate exceeds £2 million, the available RNRB is reduced by £1 for every £2 by which the estate exceeds that threshold.

The taper considers the value of the wider estate, not merely the value of the family home.

This means an individual can own a relatively modest home but still have their RNRB restricted because they also hold substantial investments, business interests or other assets. This is why valuing an estate for IHT purposes needs to capture the full picture of someone’s wealth, not just the value of their home.

For sufficiently large estates, the taper can remove the RNRB completely.

Worked example: Residence Nil Rate Band taper

Consider an estate valued at £2.2 million that would otherwise qualify for a £175,000 RNRB.

The estate exceeds the £2 million taper threshold by £200,000.

The allowance is reduced by £1 for every £2 above the threshold:

• Amount above £2 million: £200,000.
• RNRB reduction: £100,000.
• Original RNRB: £175,000.
• Remaining RNRB: £75,000.

Assuming no other restrictions apply, the estate would therefore have £75,000 of Residence Nil Rate Band available rather than the full £175,000.

This demonstrates why estate value should be monitored alongside the value of the family home.

What happens if you downsize or sell your home?

Selling or downsizing from a family home does not necessarily mean the estate will automatically lose access to the Residence Nil Rate Band.

A downsizing addition can potentially preserve some or all of the allowance where a person disposed of, downsized from or ceased to own a qualifying residence and other assets are subsequently left to direct descendants.

The rules are intended to prevent people from being disadvantaged simply because they moved to a smaller property, sold their home or moved into residential care before death.

However, the downsizing provisions contain detailed conditions and calculations. The amount potentially available depends on factors including the former qualifying residence, the value retained within the estate and the assets ultimately passing to direct descendants.

Records of previous property ownership and sale transactions should therefore be retained where a future downsizing claim may be relevant.

Why the frozen RNRB matters for estate planning

The maximum Residence Nil Rate Band remains £175,000 and is currently frozen until 5 April 2030. The standard Inheritance Tax nil rate band also remains frozen at its existing level during this period. Reviewing the current Inheritance Tax thresholds together, rather than looking at the RNRB in isolation, gives a clearer picture of how frozen allowances affect a growing estate over time.

Freezing the allowances can affect estates even where an individual’s circumstances have not materially changed.

If property, investments and other assets increase in value while the available allowances remain unchanged, a larger proportion of the estate may potentially become exposed to Inheritance Tax.

Increasing asset values can also be particularly significant for estates approaching £2 million because growth may push the estate into the RNRB taper.

For example, an estate below £2 million today could move above the taper threshold following several years of property or investment growth, reducing the Inheritance Tax residence allowance available on death.

Regular estate reviews can therefore be useful for individuals whose wealth is approaching the taper threshold.

Common Residence Nil Rate Band mistakes

Common misunderstandings surrounding the RNRB include:

• Assuming everyone who owns a home automatically receives the full £175,000 allowance.
• Assuming any relative qualifies as a direct descendant.
• Believing a buy-to-let property automatically qualifies because it is residential.
• Ignoring the £2 million estate taper.
• Assuming unused RNRB automatically transfers between spouses without the appropriate claim.
• Failing to retain documents relating to the first spouse or civil partner’s estate.
• Assuming selling or downsizing from the family home always means the RNRB is lost.
• Looking only at the value of the home when assessing the £2 million taper.

These distinctions are particularly important for estates containing substantial property or investment wealth because an incorrect assumption about RNRB eligibility can materially change the expected Inheritance Tax liability.

Key takeaways

The Residence Nil Rate Band provides an additional Inheritance Tax allowance where a qualifying residential interest passes to direct descendants. The maximum RNRB remains £175,000 for 2026/27 and is currently frozen at that level until 5 April 2030.

Eligibility depends on more than simply owning a property. The relationship between the deceased and beneficiary, the history and value of the residence, the amount passing to direct descendants and the overall estate value all need to be considered.

For estates above £2 million, the RNRB taper can significantly reduce or completely remove the allowance. Married couples and civil partners may also be able to transfer unused RNRB to the surviving partner’s estate, while the downsizing provisions can preserve relief where a qualifying home was sold or replaced before death.

Understanding these rules and reviewing the estate before it approaches the Residence Nil Rate Band threshold can help families identify whether the allowance is genuinely available and avoid relying on an Inheritance Tax calculation that does not reflect the estate’s actual circumstances.