Leaving everything to one child in a will is legal in England and Wales. Under testamentary freedom, you can leave your estate to whomever you choose, and there is no rule that children must be treated equally. The main risk is a claim by an excluded child under the Inheritance (Provision for Family and Dependants) Act 1975, so the practical work is in making the decision hold.
Most guides on this are written for the child who has been left out. This one is for the person making the will: whether you can do it, how an excluded child could challenge it, and the steps that make the decision harder to overturn. Figures are current as at August 2026 and subject to change.
Can you legally leave everything to one child?
Yes. Under the principle of testamentary freedom in England and Wales, you can leave your whole estate to one child and exclude the others, and the law does not require you to divide an estate equally between children (gov.uk, making a will, as at August 2026, subject to change). What the law allows separately is a later claim for reasonable financial provision, so the question shifts from can you to will it hold.
Parents choose this for many reasons: one child gave years of unpaid care, another is already secure, a relationship broke down, or a disabled child needs the whole estate. The reason matters less to the will's validity than to how it fares if challenged, because a court weighs the background. Recording your reasons is part of doing this properly, covered below.
Can the other children challenge the will?
They can try, by two routes. The first accepts the will is valid but asks a court for a share anyway, under the 1975 Act. The second attacks the will itself as invalid. They are different claims with different requirements, and an excluded child will usually consider both.
| Route | Who can bring it | Time limit | What it needs to succeed |
|---|---|---|---|
| Claim for reasonable financial provision (Inheritance Act 1975) | A spouse or civil partner, former spouse, child (including an adult child), a child of the family (such as some stepchildren), a cohabitee of two or more years, or someone maintained by the deceased | Six months from the grant of representation, though a court has discretion to extend it | Evidence that the will fails to make reasonable financial provision for the claimant's maintenance, judged against the statutory factors |
| Challenge to the will's validity | Anyone with an interest, such as a child who would inherit under an earlier will or the intestacy rules | Best raised before probate; no fixed statutory deadline, but delay weakens the case | Grounds such as lack of mental capacity, undue influence, want of knowledge and approval, forgery, or a will not signed and witnessed correctly |
Source: Inheritance (Provision for Family and Dependants) Act 1975, legislation.gov.uk and gov.uk, wills and probate, as at August 2026, subject to change.
For an adult child, the 1975 Act claim is not a free pass. The court asks whether the will fails to provide for their reasonable maintenance, a narrower test than the one applied to a surviving spouse. In Ilott v The Blue Cross [2017] UKSC 17, an estranged adult daughter left out of an estate of about £486,000 was awarded just £50,000 by the Supreme Court, which stressed that provision is for maintenance, not to improve a claimant's lifestyle. An estranged, financially independent adult child faces a real hurdle, but the risk is rarely zero.
How do you make the decision stand up?
You cannot stop someone bringing a claim, but you can make it far more likely to fail and less likely to be started. The aim is a clearly valid will plus a contemporaneous record of why you decided as you did. In practice, these steps matter most.
- Use a professionally drafted will. Correct signing and witnessing, and a clear record of instructions, remove the easiest validity arguments, such as improper execution. Our guide on how to write a will explains what a valid will requires.
- Write a letter of wishes. This is a private document, stored with the will, setting out in your own words why you have left everything to one child. It is not binding, and it did not stop the claim in Ilott, but a court can take your reasons into account, and a calm, factual explanation carries more weight than silence.
- Record evidence of capacity. Where age, illness or a likely dispute is a factor, a mental-capacity assessment by a doctor at the time of signing directly answers a later claim of lack of capacity or undue influence.
- Consider a modest gift rather than total silence. Leaving an excluded child a small legacy, sometimes with a clause explaining it is deliberate, can be harder to attack than leaving them out entirely, because it shows they were considered.
- Review the will after major changes. Marriage usually revokes an earlier will, and divorce, new children and falling-outs all change the picture, so an old will may not say what you now intend.
None of this guarantees an outcome, and a determined claim can still be brought. What these steps do is shift the odds, and they are often the difference between a decision that holds and one negotiated away to avoid court.
Does leaving everything to one child change the inheritance tax?
No, and this is the point most people get wrong. Inheritance tax is charged on the estate before anything is shared out, not on each child who receives a share, so the bill is the same whether your estate passes to one child or to five. Splitting an estate does not reduce it, and concentrating it does not raise it.
A single parent leaving a home to their children can use the nil-rate band of £325,000 plus the residence nil-rate band of up to £175,000, up to £500,000 before tax, and leaving the home to just one child still qualifies, because one child is a direct descendant (gov.uk/inheritance-tax and gov.uk residence nil-rate band, as at August 2026, subject to change). The same £600,000 estate is taxed identically either way.
| Estate of £600,000 (home plus savings) | All to one child | Split between three children |
|---|---|---|
| Nil-rate band | £325,000 | £325,000 |
| Residence nil-rate band (home to a direct descendant) | £175,000 | £175,000 |
| Total tax-free | £500,000 | £500,000 |
| Taxable estate | £100,000 | £100,000 |
| Inheritance tax at 40% | £40,000 | £40,000 |
Illustration only. Nil-rate band £325,000, residence nil-rate band up to £175,000 and the 40% rate are as at August 2026. As announced at Budget 2025 on 26 November 2025, these bands and the £2,000,000 taper threshold are frozen until 5 April 2031 (gov.uk/inheritance-tax, subject to change). The residence band is withdrawn by £1 for every £2 of estate above £2,000,000. See our inheritance tax guide.
Is it better to give everything to one child while you are alive?
Giving during your lifetime is possible but carries its own trade-offs, and it does not remove the risk of a later claim. An outright gift leaves your control at once, may still be counted if you die within seven years, and can be caught by other rules. For many families a will remains the more controlled route.
| Approach | How it works | Main considerations |
|---|---|---|
| Leave everything to one child in your will | The estate passes on death under the will | You keep full control during life; the estate can still face a 1975 Act claim; inheritance tax is charged as normal |
| Give everything to one child during your lifetime | An outright gift now, using the annual £3,000 exemption and the seven-year rule for larger gifts | You lose control of the asset; the gift may still count for inheritance tax if you die within seven years; giving away assets to reduce care costs can be treated as deliberate deprivation of assets |
Gift exemptions and the seven-year rule: gov.uk, inheritance tax on gifts, as at August 2026, subject to change.
Moving assets specifically to limit the impact of care fees can also be treated by a local authority as deliberate deprivation. Our guides on gifting money to children and giving your home to your children cover these traps.
What happens if you leave no will at all?
If you want one child to inherit everything, you must say so in a valid will, because the intestacy rules that apply when there is no will do the opposite. They divide an estate equally between all of your biological and adopted children where there is no surviving spouse or civil partner (gov.uk, intestacy rules, as at August 2026, subject to change).
Intestacy cannot deliver everything to one child. It shares the estate out on a fixed formula that ignores your wishes, so anyone who wants an unequal result must make a will to achieve it.
Scotland and Northern Ireland
This guide describes the law of England and Wales, where testamentary freedom is wide. Scotland is different: children have legal rights to a share of the moveable estate, such as cash and investments, which a will cannot cut out, so leaving everything to one child is harder there. Northern Ireland has a separate framework broadly similar to England and Wales. Where an estate crosses a border, advice in the relevant jurisdiction is worthwhile.
Frequently asked questions
Can I leave everything to one child in my will?
Yes. In England and Wales, testamentary freedom lets you leave your whole estate to one child and exclude the others, and there is no requirement to treat children equally (gov.uk, as at August 2026, subject to change). An excluded child may be able to claim reasonable financial provision under the Inheritance (Provision for Family and Dependants) Act 1975, so the decision is best recorded and properly drafted.
Can my other children contest the will if I leave them out?
They can try, by two routes. They can accept the will but claim reasonable financial provision under the 1975 Act, normally within six months of the grant of representation, or they can challenge the will's validity on grounds such as lack of capacity or undue influence (legislation.gov.uk, as at August 2026, subject to change). An estranged, financially independent adult child faces a harder task than a dependent one.
Do I have to explain why I left everything to one child?
No, you are not required to explain, but doing so helps. A letter of wishes stored with your will, setting out your reasons in your own words, is not binding, yet a court can take it into account if a claim is brought. A clear, factual explanation tends to carry more weight than leaving a child out in silence.
Does leaving my home to one child affect inheritance tax?
It does not increase the bill. Inheritance tax is charged on the estate before it is shared out, so it is the same whether you leave everything to one child or split it. Leaving your home to one child still qualifies for the residence nil-rate band of up to £175,000, because one child is a direct descendant (gov.uk, as at August 2026, subject to change).
How long do my other children have to make a claim?
A claim under the 1975 Act must normally be brought within six months of the date of the grant of representation, although a court has discretion to allow a late claim in some circumstances (legislation.gov.uk, as at August 2026, subject to change). A challenge to the will's validity has no fixed statutory deadline, but is best raised early, before the estate is distributed.
Can I disinherit a child in Scotland?
Not fully. Scottish succession law gives children legal rights to a share of the moveable estate, such as money and investments, which a will cannot remove, so leaving everything to one child is harder to achieve in Scotland than in England and Wales. Advice under Scottish law is sensible where the estate is based there.