Trusts are widely used in UK estate planning, but “trust” is not a single product. Two common structures are discretionary trusts and life interest trusts (often called interest in possession trusts). People often ask which one “minimizes IHT,” but tax outcomes depend on context, and non tax goals like protecting children and managing second marriages often drive the decision.
Discretionary trusts, what they are
A discretionary trust gives trustees the power to decide:
- which beneficiaries receive benefits
- when they receive them
- whether benefits are income, capital, or both
Beneficiaries do not have an automatic right to a fixed share. This can help keep control and add protection when family circumstances change.
Common uses:
- beneficiaries who are young or not good with money
- protecting family wealth from beneficiary divorce or creditor risk
- flexibility across children and grandchildren
IHT notes at a high level:
- discretionary trusts can fall under the relevant property regime, which may involve periodic and exit charges.
- lifetime transfers into discretionary trusts can be chargeable if above the nil rate band.
- trusts created on death can still be effective, but results depend on how the estate is structured.
Life interest trusts, what they are
A life interest trust gives one person (the life tenant) a right to benefit, often:
- the right to income from trust assets, or
- the right to live in a property
After the life tenant dies (or the interest ends), the assets pass to the remaindermen, often children.
Common uses:
- second marriages, where you want to provide for a spouse but preserve capital for children
- letting a spouse stay in the home for life, with the property passing to children later
- balancing support and control with more certainty than a discretionary trust
IHT notes at a high level:
- spouse exemption may apply if the spouse is the life tenant and the trust is structured appropriately, often deferring IHT.
- in some setups, the trust assets may be treated as part of the life tenant’s estate for IHT.
Many people compare these trusts after they have clarified their overall estate goals.
Which minimizes IHT?
There is no automatic winner. A better way to decide is to match the trust to the goal.
A life interest trust can make sense where you want to:
- provide a spouse with housing or income
- protect capital for children from a previous relationship
- reduce the risk of assets being redirected away from children
A discretionary trust can make sense where you want:
- trustee control and flexibility
- stronger protection against beneficiary risks
- the option to adjust distributions based on changing circumstances
Tax is part of the decision, but many families accept a structure with some administration if it achieves control, fairness between family branches, and protection for children.
Choosing between them, a practical checklist
- Who needs support first, and what type (income, housing, capital)?
- Is a second marriage involved?
- Are beneficiaries financially responsible?
- Are there divorce or creditor risks in the family?
- Who will act as trustees, and are they capable and independent?
- Is ongoing administration acceptable?
