Nil-Rate Band Trusts
Using Your Inheritance Tax Allowance to Protect Family Wealth
A Nil-Rate Band Trust — often called a Nil-Rate Band Discretionary Trust, or NRBDT — is a strategic estate planning tool created within a will. It allows you to ring-fence assets up to the value of your inheritance tax (IHT) allowance so that on the first death those assets pass into trust rather than to the surviving spouse outright. This sits them outside the survivor's taxable estate, while still allowing them to be used flexibly for the family.
For some couples, it's a quietly elegant way to use both nil-rate bands and add a layer of protection and control that a simple "all to spouse" will can't provide.
Understanding the Nil-Rate Band
Understanding the Nil-Rate Band
The Nil-Rate Band (NRB) is the amount an individual can pass on free of inheritance tax.
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The threshold is currently £325,000 per person and has been frozen at that level until at least April 2030.
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The Transferable Nil-Rate Band. Since 2007, any unused portion of a deceased spouse or civil partner's NRB can be transferred to the survivor. In effect, a married couple or civil partners now have a combined tax-free allowance of up to £650,000 (£325,000 each).
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The Residence Nil-Rate Band (RNRB) is a separate, additional allowance — currently £175,000 — available where the family home is passed to direct descendants. It has its own qualifying rules and is tapered for larger estates.
Why an NRBDT Still Matters
The introduction of the Transferable Nil-Rate Band in 2007 reduced the pure tax reason for using an NRBDT — most couples can already use both NRBs without one. But these trusts remain valuable for a range of other reasons:
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Asset Protection. Because the trust owns the assets rather than the surviving spouse, they're generally insulated from the survivor's later creditors and from divorce settlements involving a subsequent partner.
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Care Fees. Because the survivor doesn't own the assets outright, they are generally excluded from the means-testing that applies to long-term care funding. (Note: as with all care-fee planning, the deliberate deprivation rules apply — the trust must be a genuine planning step, not set up principally to avoid care costs.).
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Bloodline Planning. For anyone with children from a previous relationship, the trust ensures your share of the estate ultimately reaches your own children — even if your surviving spouse remarries or makes a new will. This is one of the most common reasons couples in blended families still use NRBDTs.
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Capturing a Third Nil-Rate Band. A specific but valuable scenario: if a surviving spouse was previously widowed, they may already be carrying a transferred NRB from that first marriage. Because only one additional NRB can be transferred per person, an NRBDT in the new marriage's will can preserve the new spouse's NRB by using it on the first death — so the previously transferred NRB isn't lost. This is technical, but for the right family it can be very significant.
Potential Drawbacks to Weigh Up
An NRBDT isn't right for every couple. The genuine considerations include:
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Ongoing Administration. Once active, the trust must be registered with HMRC's Trust Registration Service, with annual reporting where applicable and professional management or trustee oversight.
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Impact on the Residence Nil-Rate Band. Leaving the family home directly to a trust can mean the RNRB is lost, as it only applies where the home passes to direct descendants. There are ways around this (see below), but you need to plan for the risk from the outset.
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Complexity in Family Decisions. A discretionary trust gives trustees considerable flexibility — which is part of its strength — but can also create the conditions for disagreement if the family hasn't been clearly briefed on the settlor's intentions.
How an NRBDT Is Set Up
The trust itself is created by your will and takes effect on your death. The structure involves four practical steps:
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Will Drafting. Your will must contain specific clauses that create the trust on first death and set out the class of beneficiaries, the trustees' powers, and any guidance.
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Severing the Tenancy. For property held jointly by a couple, ownership often needs to be changed from joint tenants to tenants in common so that each spouse owns a distinct share that can be directed into the trust.
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Appointing Trustees. You choose people you trust to manage the trust — often including the surviving spouse alongside an independent or professional trustee for balance.
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Registration on Activation. Once the trust becomes active (on the first death), the trustees register it with HMRC's Trust Registration Service. We support trustees through this process.
How NRBDTs Work in Practice
What gives the NRBDT much of its real-world value is the flexibility the trustees have after the first death.
A Wide Class of Beneficiaries
Unlike a simple will that names only a spouse or children, an NRBDT typically defines a broader class — the surviving spouse, children, grandchildren, and sometimes further descendants. This lets trustees support whoever needs it most as circumstances change: paying for a grandchild's education, helping a child through a financial difficulty, or making provision for a beneficiary who relies on means-tested benefits, without disqualifying them from that support.
Funding Through "Debt or Charge" Arrangements
Where the estate doesn't have enough liquid cash to fund a full £325,000 legacy into the trust, the trust can instead take a debt or a charge over the deceased's share of the family home. In practice, the surviving spouse continues to live in the property, with the trust holding either a formal IOU (debt) or an equitable charge for the value of the deceased's share. When the survivor later dies, that debt or charge reduces the value of their estate for IHT. It's a long-standing and effective approach — though HMRC may challenge these arrangements where they appear circular (for example, where the survivor effectively gifted the funds to the deceased in the first place), so they need careful structuring.
"Appointing Out" Within Two Years
Trustees also have the power to appoint assets out of the trust to a beneficiary, and there's a particularly useful rule here:
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The two-year window. Under section 144 of the Inheritance Tax Act 1984, where assets are appointed out of the trust within two years of death, the appointment is "read back" into the will for inheritance tax purposes — as if the deceased had left those assets directly to the recipient.
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Securing the RNRB. This is the practical answer to the RNRB risk mentioned earlier. If the home has gone into the trust but it would be better tax-treated passing to a direct descendant, the trustees can appoint it out to a child or grandchild within two years and retrospectively secure the RNRB.
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Winding up if no longer needed. If circumstances or the law change such that the trust is no longer the right structure, the trustees have the flexibility to distribute the assets and bring the trust to an end.
This combination — the trust on first death, plus the trustees' flexibility for two years afterwards — is what makes the NRBDT a remarkably adaptable planning tool, even in an era of transferable allowances.
Get Specialist Advice On Your Situation
An NRBDT can be genuinely valuable, but only where it's drafted carefully and matched to your family's situation. We help couples review whether an NRBDT fits their plans, support trustees through the practical work after a death, and review existing arrangements where families want to know the structure they have is still doing its job.