Most parents assume that writing their children into their will is enough. Name the kids, split the estate, done. But if your children are minors, this assumption leads to one of the most avoidable and expensive problems in estate planning: court-supervised guardianship of their inheritance.
Minors cannot legally own or control significant assets. When a child under 18 is left money in a will without a trust, a probate court steps in — appoints a property guardian, requires annual accountings, and controls how the money is spent until the child turns 18. At 18, everything is handed over at once, regardless of the child's maturity or financial readiness.
This guide explains how to leave an inheritance to minor children the right way — keeping courts out of it, keeping control where you intend it, and ensuring the money actually serves your children's long-term interests.
Under U.S. law, minors (anyone under 18, or 19 in some states) lack legal capacity to enter into contracts, own real property in their own name, or manage significant financial accounts. If you leave $200,000 to a 10-year-old in a will, what happens?
This process is expensive (attorney fees, court costs, bond premiums), time-consuming, and completely avoidable with the right estate plan.
The 18-year-old problem: Even if the court guardianship process goes smoothly, the end result is a legal adult receiving potentially hundreds of thousands of dollars all at once. Research consistently shows that young adults who receive large lump-sum inheritances before their mid-20s are significantly more likely to exhaust those funds within a few years. Planning for this is not pessimism — it's love.
A testamentary trust is created inside your will and comes into existence only when you die. It's one of the most widely used tools for parents leaving money to minor children.
Here's how it works:
Pros: Relatively simple to draft, no ongoing maintenance while you're alive, no separate trust document required.
Cons: Because the trust is created through your will, it must go through probate before it takes effect. The trust assets will be subject to probate court oversight for creation, but once established, operate independently. Also, a testamentary trust doesn't help with assets that pass outside the will (life insurance, retirement accounts, joint accounts).
A revocable living trust is generally superior to a testamentary trust for parents with minor children because it avoids probate entirely. Assets held in the trust pass directly to your children's subtrust at your death, without court involvement of any kind.
Within your revocable trust, you create a children's subtrust (sometimes called a "children's pot trust" or separate subtrusts for each child) that:
This is the gold standard for most parents with young children. It's more expensive upfront than a simple will, but eliminates probate, court fees, and the 18-year-old lump-sum problem entirely. See our guide on how to set up a living trust and living trust vs. will for more detail.
💡 Pot trust vs. separate subtrusts: A "pot trust" pools all children's assets in one trust, giving the trustee flexibility to spend more on whichever child has greater needs at any given time (useful when children are very different in age). Separate subtrusts give each child their own pool — cleaner accounting, but less flexibility. Many families use pot trusts until the youngest child reaches a certain age, then split into separate shares.
For smaller inheritances or gifts during your lifetime, a Uniform Transfers to Minors Act (UTMA) or Uniform Gifts to Minors Act (UGMA) custodial account is a quick, inexpensive option. You name a custodian (an adult you trust) to manage the account on the child's behalf. When the child reaches the age of majority (18 or 21 depending on state and account type), they receive the assets outright.
Pros: Simple to set up (available at most brokerages), inexpensive, no ongoing legal fees, appropriate for modest amounts.
Cons: The child gets the money at 18 or 21 — no control over this. No spendthrift protection. Once the custodian transfers assets in, the gift is irrevocable. Counts against the child in financial aid calculations for college. For larger inheritances, a trust is almost always the better choice.
Best use case: Grandparents making regular gifts to grandchildren, or for accounts under ~$50,000 where trust setup costs aren't justified.
A 529 plan is specifically designed for education savings and can be an effective component of leaving assets for minor children — though it's not a substitute for broader estate planning.
Key features relevant to inheritance planning:
529 plans work well alongside a broader trust strategy — the trust handles general inheritance, the 529 specifically addresses education funding.
One of the most important decisions in any minor children's trust is when to distribute assets. You have complete flexibility to set any age or conditions you wish. Common approaches:
| Distribution Strategy | How It Works | Best For |
|---|---|---|
| Lump sum at 25 | Trust ends; child receives full balance at 25 | Moderate estates; parents who trust their children's judgment by mid-20s |
| Staged distributions | 1/3 at 25, 1/3 at 30, remainder at 35 | Larger estates; provides a "second chance" if first distribution is mismanaged |
| Income only until milestone | Trust pays income (not principal) until child completes college or reaches 30 | Parents who want to encourage education or career before windfall |
| Discretionary trust | Trustee decides distributions based on need, with principal preserved as long as possible | Large estates; children with special needs or financial vulnerability |
Most estate planners recommend against distributing large inheritances before age 25. Brain development research suggests that financial judgment and impulse control continue maturing into the mid-20s. Staged distributions provide both the security of having funds available and protection against a single catastrophic decision.
The trustee is the most important appointment in your children's trust. They will manage the money, make distribution decisions, and be accountable to your children for potentially decades. Choose carefully.
💡 Always name a successor trustee. If your first-choice trustee dies, becomes incapacitated, or resigns, you need a backup. Don't leave it to a court to appoint one. Name at least two successors in your trust document.
A critical mistake parents make is naming their minor children directly as beneficiaries on life insurance policies and retirement accounts. This triggers the same problem as naming them directly in a will — courts must supervise the assets until the child turns 18.
Instead, name your trust as the beneficiary of these accounts. The trust document's instructions then govern how and when the assets are distributed to your children — on your terms, without court involvement.
Proper setup:
See our guide on how to name beneficiaries and testamentary trust guide for more.
If your child has a disability that makes them eligible for government benefits (SSI, Medicaid), leaving them a direct inheritance can disqualify them from those benefits — which may be worth far more than the inheritance itself. A special needs trust (also called a supplemental needs trust) solves this: the trust owns the assets, supplements government benefits without replacing them, and preserves your child's eligibility.
See our comprehensive special needs trust guide if this applies to your family.
Trust & Will lets you create a will with testamentary trust provisions or a full revocable living trust online — protecting your kids without the court involvement or legal fees. Trusted by over 400,000 families.
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