A Flexible Life Interest Trust (FLIT) is a hybrid will trust that gives a surviving spouse guaranteed income or use of assets for life, while trustees keep the discretion to release capital to them or to other beneficiaries. Its main advantages are the spousal exemption from inheritance tax, a preserved nil-rate band, flexibility for changing family circumstances, and protection of children’s inheritance. Its main drawbacks are the tax charges that apply after the life tenant dies, plus administration and running costs.

FLITs have quietly become one of the most useful modern planning tools for married couples and civil partners, and recent Budget changes have made them more relevant, not less. Below, we explain how a FLIT works, weigh up the genuine pros and cons, and set them against the current tax rules so you can see the full picture.

What is a Flexible Life Interest Trust?

A Flexible Life Interest Trust (FLIT) is a trust created within your will that only takes effect on your death. It’s designed mainly for couples who want to protect a surviving partner while safeguarding what’s left for children or other loved ones.

It works as a hybrid of two trust types. During the surviving spouse’s lifetime, it behaves like a life interest trust, giving them the right to income and to occupy or use the assets. Underneath that, trustees hold flexible powers more like a discretionary trust, so they can respond to whatever life throws up.

That combination is the whole point: security for the survivor now, flexibility for the family later. You can read more about how we structure these on our Flexible Life Interest Trust page.

How does a FLIT work in practice?

When the first partner dies, their share of the assets often half the family home and investments passes into the trust fund rather than directly to the survivor.

Three things then happen:

• The surviving spouse becomes the “life tenant.” They receive income from the trust and can usually continue living in the property for the rest of their life.
• The trustees can exercise their discretion to advance capital to the life tenant if they need it, for example, to fund care costs or to other named beneficiaries such as children from a first marriage.
• When the life tenant dies, the trust converts into a full discretionary trust, and the assets are held for the remaining beneficiaries according to the trustees’ judgement.

This is why a FLIT is so flexible. It doesn’t lock everything down on day one; it gives your trustees room to adapt as circumstances change, while still honouring your original wishes.

How does a FLIT differ from a standard life interest trust?

This is a distinction worth understanding, because the two are easily confused.

A standard life interest trust is largely fixed in how it operates: the life tenant receives income for life, and the capital then passes to the remainder beneficiaries on their death, with very little room to vary things. A FLIT keeps that same income entitlement but layers discretionary powers over the capital on top.

The practical effect is significant. Trustees of a FLIT can respond to changing family circumstances, releasing capital early or redirecting it without needing a court application or a formal deed of variation. That’s exactly why FLITs are increasingly chosen where there are children from a previous relationship, a spouse with fluctuating care needs, or a family dynamic likely to shift over the years. Our guide on whether someone with a life interest can sell the property explores how life interests work in more detail.

What are the advantages of a FLIT?

The Flexible Life Interest Trust pros and cons come down to a trade-off between protection and complexity. We’ll start with the advantages, because for the right family they’re substantial.

• Spousal exemption from inheritance tax. Because the life interest passes to a qualifying surviving spouse, no inheritance tax is due when assets move into the trust on the first death. Transfers between spouses and civil partners are exempt, so the trust creates no immediate IHT liability exposure is simply deferred until the life tenant dies or capital leaves the trust.
• Preserves the deceased’s nil-rate band. As the assets pass spouse-exempt, the first partner’s tax-free allowance isn’t used up. It can be carried forward for use on the second death, often producing a better outcome than an outright gift to the survivor, particularly where assets are likely to grow in value.
• Flexibility for changing family circumstances. Blended families, second marriages, and future care needs are hard to predict. A FLIT lets trustees adapt rather than being tied to rigid instructions written years earlier, which is valuable over the long horizons estate planning often spans.
• Protection against remarriage and third-party claims. If the survivor later remarries, divorces, or faces creditor or care-fee pressures, ring-fencing assets in trust can help shield them. Crucially, because the life tenant doesn’t own the trust assets outright, those assets are generally not available to satisfy a divorce financial remedy order in the way personally owned property would be. It also guards against the accidental disinheritance of children from a first marriage.

In short, a FLIT can give a surviving spouse genuine security while making sure your children aren’t unintentionally cut out. Our guide on protecting property wealth with a trust on death explores this protective role further.

What are the disadvantages of a FLIT?

No planning tool is perfect, and we believe in being straight about the downsides. A FLIT carries real trade-offs that make it the wrong fit for some families.

• Tax charges after the life tenant dies. Once the life tenant dies or when capital exits during their lifetime, the trust enters the relevant property regime under the Inheritance Tax Act 1984 and becomes a discretionary trust for tax purposes. The periodic (ten-yearly) charge is calculated at up to 6% of the trust’s chargeable value, applied to the value above the available nil-rate band, with proportionate exit charges when capital leaves between anniversaries. For larger estates, this can be a meaningful cost over time. 
• Administrative burden. A FLIT is not “set and forget.” Trustees must keep proper accounts, file trust tax returns, report to HMRC, and consider their duties carefully whenever they exercise discretion. Professional trustee fees, if appointed, are a recurring cost a simple will wouldn’t create.
• Potential family tension. The life tenant benefits from income and capital preservation, while remainder beneficiaries may prefer capital released sooner. Trustees must balance these competing interests impartially, which can be difficult in emotionally charged situations. Choosing the right trustees matters enormously.
• Less useful for unmarried couples. The spousal exemption and transferable nil-rate band apply only to married couples and civil partners. An unmarried partner named as life tenant doesn’t get the same treatment, so assets may attract an immediate IHT charge on the first death.
• Ongoing running costs. For smaller estates where IHT is unlikely, and circumstances are straightforward, a well-drafted simple will with mirror provisions may achieve broadly similar outcomes at considerably lower cost and with less ongoing obligation.

FLIT pros and cons at a glance

What has changed after the Autumn Budget 2025?

This is where most existing content on FLITs is out of date. Two recent changes have made inheritance tax planning more relevant for ordinary families, the context a FLIT sits within.

First, the nil-rate bands are frozen for even longer. In the Autumn Budget on 26 November 2025, the Chancellor confirmed that both the standard nil-rate band (£325,000) and the residence nil-rate band (£175,000) will stay frozen until April 2031, extending the previous 2030 deadline by a further year. Because thresholds stay fixed while property and asset values rise, more estates are pulled into the IHT net over time, an effect often described as fiscal drag. Estates sitting below or near the threshold today may well breach it before 2031 without any deliberate action. 

Second, pensions are being brought into the IHT net. From 6 April 2027, most unused pension funds and death benefits will be included in the estate for inheritance tax for the first time. For many people, a pension is one of their largest assets, so overall estate values will rise for IHT purposes, and the interaction between pensions, property, and trust structures will need more careful coordination.

Together, these changes mean more families will face an IHT bill than before. They don’t make a FLIT the automatic answer, but they do reinforce the case for reviewing your will and trust arrangements now rather than later. We’d frame this as context, not personal tax advice, which should always be tailored to your circumstances by a qualified professional. Our inheritance tax planning page explains how we approach this.

Key questions to ask before setting up a FLIT

Before committing to a FLIT, it’s worth working through these questions honestly:

1. Does the estate involve assets likely to exceed the nil-rate band thresholds, either now or by 2031?
2. Are there children from a previous relationship whose interests need protecting alongside a surviving spouse?
3. Is the surviving spouse likely to need care funding later, where trustee discretion over capital would genuinely help?
4. Are the proposed trustees willing and able to meet their ongoing duties, including tax reporting and impartial decision-making?
5. Has the interaction between pension assets and the trust been considered, especially given the April 2027 changes?

Honest answers here usually reveal whether a FLIT is the right vehicle, or whether an alternative structure would serve your objectives better.

When should you consider a Flexible Life Interest Trust?

A FLIT tends to make most sense when protection and flexibility both matter. In our experience, it’s worth serious consideration if you:

• Are married or in a civil partnership and want to provide for your partner while protecting your children’s inheritance.
• Have a blended family or children from a previous relationship.
• Are concerned about a surviving spouse remarrying or facing third-party claims such as divorce or creditors.
• Want to keep options open for future care needs without giving up control now.
• Have an estate that may be exposed to inheritance tax under the frozen thresholds.

It’s usually less suitable if you’re unmarried, have a very simple estate, or would prefer the lower cost of a straightforward will. If you’re weighing that choice, our blog on why you might set up a trust instead of just writing a will is a useful starting point, and you can compare options on our trusts overview.

Flexible Life Interest Trust: The Key Points at a Glance

• A FLIT gives a surviving spouse income and use of assets for life, while trustees keep discretion over capital, then converts to a discretionary trust when the life tenant dies.
• It differs from a standard life interest trust by adding flexible powers over capital, without needing a court application or deed of variation.
• Pros: spousal exemption (no IHT on first death), preserved nil-rate band, flexibility, and protection against remarriage, divorce claims, and disinheritance.
• Cons: ten-yearly and exit charges under the relevant property regime, administration, possible family tension, fewer benefits for unmarried couples, and running costs versus a mirror will.
• Current context: the nil-rate band (£325,000) and residence nil-rate band (£175,000) are frozen until April 2031, and unused pensions enter the IHT estate from April 2027, both increasing the relevance of IHT planning.

Speak to Our Trusts Team

Every family is different, and a FLIT is only worth setting up if it genuinely fits your circumstances. We’re always happy to talk it through honestly, including whether a simpler option might serve you better, explaining the tax implications in plain terms and drafting a trust that reflects your intentions accurately.

Your legacy is too important to leave to chance, and planning it shouldn’t feel like climbing a mountain. Paradigm Wills makes the process of protecting your loved ones and securing your estate genuinely straightforward, with friendly, no-obligation consultations designed to put you at ease from the very first conversation. Whether you’re in Leicester, London, Birmingham, or anywhere in between, expert guidance is closer than you think. Take the first step today call the Leicester Office on 0116 464 7055 or the London Office on 0208 194 7189.