The Spousal Exemption and Your Will

If you're married or in a civil partnership, there's a rule in inheritance tax law that works quietly in your favour — and it's worth understanding, even if you never think about tax day to day.

It's called the spousal exemption, and it means that anything you leave to your husband, wife, or civil partner on your death is entirely free of inheritance tax (IHT) — no matter how much it's worth. There's no cap, no percentage, no sliding scale. If everything passes to your spouse, there's simply no IHT to pay on the first death between the couple.

That sounds straightforward, and for most couples, it is. But it also opens the door to something people often haven't thought about: what happens to your unused tax-free allowances when you die.

A quick primer: the nil-rate band and residence nil-rate band

Every individual has certain amounts they can leave before IHT applies:

- The nil-rate band (NRB) is currently £325,000. It's the amount anyone can leave, to anyone, free of IHT. [1]

- The residence nil-rate band (RNRB) is an additional £175,000, available when your family home is left to children or grandchildren. [2]

Between the two reliefs, an individual can currently pass on up to £500,000 free of IHT.

Why the spousal exemption matters here

If you leave everything to your spouse when you die, you won't have used any of your own nil-rate band or residence nil-rate band — because the spousal exemption meant you didn't need to.

The good news is that allowance isn't wasted. Under current rules, any unused NRB and RNRB can be transferred to your surviving spouse, to be used on their death, in addition to their own. In practice, this means a surviving spouse's estate can potentially benefit from both partners' allowances — up to £1 million between them — when the second spouse dies and assets pass on to the next generation.

This is why many married couples structure their Wills so that everything passes to the surviving spouse first, preserving both allowances for the family in the longer term, rather than triggering unnecessary tax on the first death.

Why this needs to be written into your Will properly

None of this happens automatically just because you're married. It depends on:

- What your Will actually says, and whether it directs assets to your spouse in a way that qualifies for the exemption

- Both estates being properly recorded, so the unused allowance can be claimed when it's needed

- Your circumstances — for example, this general position assumes both spouses are UK long-term resident; different rules can apply where one spouse is not a long-term resident.

This is a good example of why a Will is about more than "who gets what." A well-drafted Will thinks about how things pass, not just to whom — because the how can make a real difference to what's left for the people who matter to you.

Getting it right

The spousal exemption and the transfer of unused allowances are genuinely helpful reliefs, but they work best when a Will is drafted with them in mind. I help clients understand how these rules apply to their own circumstances as part of preparing a Will — always tailored to your situation.

If you'd like to talk through how this might apply to you and your spouse or civil partner, I'd be glad to help.

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[1] A note on the NRB: this explanation assumes the full £325,000 is available, but lifetime gifts within seven years of death can reduce how much of it is left. What's set out here doesn't account for gifting history — just the basic mechanics of how the spousal exemption interacts with the allowance.

[2] A note on the RNRB: it's one of the more complicated parts of IHT law, with its own conditions and tapering rules for larger estates. What's set out here is a simplified explanation, focused on how it interacts with the spousal exemption — not a complete guide to how the RNRB works.

This article is general information only and does not constitute legal or tax advice. On Yin Li Solicitor is regulated by the SRA (SRA number 8006709) and provides Will and Lasting Power of Attorney services only; this practice does not offer standalone lifetime tax planning advice. Please get in touch to discuss your individual circumstances. All rights reserved.