Estate Planning for Grandchildren: Strategies for HNW Families (2026)

Transferring wealth to grandchildren is more tax-efficient than almost any other estate planning move — but it introduces a third layer of federal tax that most families overlook: the generation-skipping transfer (GST) tax. Done right, you can move hundreds of thousands of dollars to grandchildren with zero gift, estate, or GST tax. Done wrong, the same transfer triggers 40% at two separate events. This guide covers every tool in order of complexity.

The extra layer: generation-skipping transfer (GST) tax

When you leave money directly to a child, federal transfer taxes apply once — either at your death (estate tax) or at the time of a gift. But when you skip a generation and leave money directly to a grandchild (or great-grandchild), the IRS levies the GST tax on top of any estate or gift tax. At 40%, this is not a rounding error.

Example: You have a $20M estate. You die in 2026, leaving $5M to each of your four children and nothing directly to grandchildren. No GST tax issue — the $20M estate uses your $15M exemption with $5M subject to 40% estate tax. But if instead you leave $2.5M directly to each of your eight grandchildren: the transfer to each grandchild is a "direct skip" to a skip person. Each $2.5M bequest triggers GST tax (at 40%) on top of estate tax already owed on the $20M estate. You can avoid this entirely by using your $15M GST exemption allocation — but you have to allocate it deliberately. It doesn't happen automatically on bequests.

The good news: there are several strategies that move money to grandchildren while avoiding GST entirely — no exemption needed.

Strategy 1: Direct tuition and medical payments (IRC §2503(e)) — unlimited and fully excluded

The most tax-efficient grandparent gift is paying tuition or medical expenses directly to the institution. Under IRC §2503(e), unlimited direct payments to qualifying educational institutions (tuition only — not room/board) and to medical providers are completely excluded from gift tax.⁴ These payments don't count against your $19,000 annual exclusion and don't use any of your $15M lifetime exemption.

Critically, the GST tax exclusion follows. Under IRC §2611(b)(1), any transfer excluded from gift tax under §2503(e) is also excluded from the GST tax.⁵ A grandparent paying $80,000/year in private university tuition for a grandchild owes zero gift tax and zero GST tax on every dollar — permanently, and without reducing any exemption.

Requirements:

• Payment must go directly to the educational institution or medical provider — not to the grandchild or a 529 plan.
• Educational exclusion covers tuition only. Room, board, books, and living expenses do not qualify.
• Any accredited educational institution qualifies — undergraduate, graduate, private K-12.
• Medical exclusion covers amounts paid to a qualifying medical facility or to an insurance company for medical insurance.
• No Form 709 required if the payment stays under these exclusions.

Strategy 2: Annual gift tax exclusion — $19,000/year per grandchild

The annual exclusion of $19,000 per donor per recipient in 2026 ($38,000 for married couples using gift-splitting) allows gifts to grandchildren with zero gift tax and, importantly, zero GST tax.¹ Under IRC §2642(c)(1), a transfer that qualifies as a "nontaxable gift" because it falls within the annual exclusion is also excluded from GST — as long as the gift is a direct, present-interest transfer to the individual (not to a trust).

For a couple with four grandchildren in 2026: $38,000 × 4 = $152,000 per year removed from the estate with zero gift, estate, or GST tax consequence. Over 10 years, that's $1.52M moved out — no forms filed, no exemption used.

Trust caveat: Annual exclusion gifts to trusts for grandchildren do not automatically qualify for the GST annual exclusion unless the trust meets narrow requirements (a present interest trust under §2642(c)(2), typically requiring Crummey notices and a single beneficiary). If you want to fund a trust for multiple grandchildren using annual exclusion gifts, you'll need to allocate GST exemption to the trust. A dynasty trust funded with annual exclusion gifts is one common structure — see Strategy 5 below.

Strategy 3: 529 plan superfunding

A 529 plan contribution for a grandchild (or great-grandchild) is a completed gift — subject to gift tax rules — but offers a powerful acceleration tool. Under IRC §529(c)(2)(B), you can elect to treat a lump-sum contribution as if it were made in equal installments over five years.² This allows you to contribute five years' worth of annual exclusion in a single year:

• Single grandparent: $19,000 × 5 = $95,000 per grandchild
• Married grandparents: $38,000 × 5 = $190,000 per grandchild

This lump sum leaves your estate immediately, grows inside the 529 tax-deferred, and qualifies for the GST annual exclusion — no GST exemption needed. The IRS confirmed in Notice 2001-50 that 529 contributions that qualify for the gift tax annual exclusion also qualify as nontaxable gifts for GST purposes under §2642(c)(1).⁶

Key rules:

• File Form 709 in the year of the superfunding election, even if no gift tax is owed — the election must be reported.
• You cannot make additional annual exclusion gifts to the same beneficiary during the 5-year window without using lifetime exemption. (Additional contributions are still permitted — they just use exemption rather than annual exclusion.)
• Unused 529 funds can be transferred to another beneficiary's 529, used for the beneficiary's K-12 tuition (up to $10,000/year), used for student loan repayment (up to $10,000 lifetime), or — starting in 2024 — rolled to the beneficiary's Roth IRA (see below).

FAFSA and grandparent 529 plans

Under the new simplified FAFSA rules effective for the 2024–25 award year and continuing through 2026, grandparent-owned 529 plans are invisible to the federal financial aid formula. The simplified FAFSA pulls income data directly from IRS tax returns and no longer asks students to report cash support from grandparents.⁷ Distributions from a grandparent's 529 are no longer counted as student untaxed income.

Exception: Private colleges using the CSS Profile may still ask about grandparent 529s. Check whether your grandchild's target schools require the CSS Profile before assuming zero aid impact.

SECURE 2.0 §126: 529-to-Roth IRA rollover

Starting in 2024, unused 529 funds can be rolled directly into the beneficiary's Roth IRA — no income tax, no penalty. This is a powerful estate planning tool: grandparents can superfund a 529 knowing that any unused education funds automatically convert into retirement savings for the grandchild, with decades of Roth compounding ahead.⁸

Rules (2026):

• Lifetime limit: $35,000 per beneficiary (total across all years)
• Annual limit: Counted against the beneficiary's annual Roth IRA contribution limit — $7,500 (under 50) or $8,600 (age 50+) in 2026
• Account age: The 529 must have been open for at least 15 years
• Contribution age: Contributions (and earnings on them) made within the last 5 years cannot be rolled over
• No income limit: Unlike regular Roth IRA contributions, there is no MAGI phase-out on §529 rollovers to Roth — a high-income grandchild can still receive the rollover
• Earned income: The beneficiary must have earned income at least equal to the rollover amount in the year of the transfer

Strategy 4: UTMA/UGMA custodial accounts

A Uniform Transfers to Minors Act (UTMA) or Uniform Gifts to Minors Act (UGMA) account is the simplest way to hold assets for a grandchild without a trust. The grandparent is custodian; the grandchild owns the assets (irrevocably) and gains full control at the age of majority — typically 18 or 21 depending on state law, with some states allowing extension to 25.

Pros: No legal fees, no trust document, no annual filing. Accepts annual exclusion gifts. Useful for holding assets until the child is old enough to manage them.

Cons: The gift is irrevocable — you cannot take the money back. The child receives full control at majority with no restrictions. UTMA accounts are student assets on the FAFSA and assessed at 20% in the federal aid formula (significantly higher than the 5.64% rate for parent assets). "Kiddie tax" rules under IRC §1(g) tax unearned income above $2,500 at the parent's marginal rate until the child is 19 (or 24 if a full-time student).

For most HNW grandparents, UTMAs work well for modest amounts and liquid assets while more sophisticated strategies handle the larger wealth transfer.

Strategy 5: Dynasty trust for multi-generational wealth transfer

For grandparents with substantial estates, a dynasty trust is the most powerful tool for transferring wealth to grandchildren — and every generation below them — without repeated estate and GST tax at each death.

The mechanics: the grantor funds an irrevocable trust using gift tax exemption ($15M individual / $30M couple) and allocates GST exemption equal to the funding amount. Trust assets grow inside the trust, avoiding estate tax at each generation's death. Because the GST exemption was allocated at funding, assets can pass to grandchildren, great-grandchildren, and further generations with no additional GST tax.

Why the compounding math is compelling:

• $5M funded into a dynasty trust in 2026, growing at 7%/year, becomes approximately $75M in 40 years.
• Without a dynasty trust: $75M passes through two generations, each subject to estate tax on amounts above the exemption. At even a conservative 20% blended tax rate, the heirs lose $15M to transfer taxes.
• With a dynasty trust funded with GST exemption: $0 in additional estate or GST tax at each generation. The full $75M (minus trustee fees) stays in the family.

Best trust situs states for dynasty trusts: South Dakota, Nevada, Delaware, and Wyoming (no rule against perpetuities, strong asset protection, no state income tax on trust). You don't need to live in these states — you establish the trust there with a local institutional trustee or trust company.

See the GST tax complete guide and dynasty trust guide for deeper mechanics.

After-death planning: naming grandchildren in your estate documents

If you plan to leave assets directly to grandchildren in your will or revocable trust — not just during life — coordinate these moves with GST exemption allocation:

• Direct bequest to a grandchild: A direct bequest from a grandparent to a grandchild is a "direct skip" subject to GST tax unless covered by your $15M GST exemption. GST exemption is not automatically allocated at death — you (or your executor) must make the allocation on Form 706.
• Trust for grandchildren at your death: A testamentary trust for grandchildren (often used with an IRA naming a see-through trust as beneficiary) should have GST exemption allocated to it. An inclusion ratio of zero means no GST tax will ever apply as assets pass within the trust.
• Portability and GST: Portability (the ability for a surviving spouse to use the deceased spouse's unused estate tax exemption) does not apply to GST exemption. Each spouse has their own $15M GST exemption — use it or lose it. This is a significant planning point: a surviving spouse cannot inherit GST exemption from a deceased spouse, unlike estate tax exemption.

ABLE accounts for grandchildren with disabilities

If a grandchild has a qualifying disability, an ABLE account (Achieving a Better Life Experience) allows tax-free savings without disqualifying them from Medicaid and SSI. Effective January 2026, the ABLE Age Adjustment Act expanded eligibility to individuals whose disability onset was before age 46 (up from 26).⁹

ABLE accounts accept up to $19,000/year (the annual exclusion amount) from any contributor — grandparents included. Funds grow tax-free and distributions for qualified disability expenses are tax-free. For grandchildren who also have a special needs trust, ABLE accounts can serve as a complementary vehicle for more flexible everyday expenses. See the special needs trust guide for integration strategies.

5 common mistakes grandparents make

1. Skipping direct tuition payments in favor of 529 contributions. A grandparent who writes a $50,000 check to a 529 plan uses up the annual exclusion and must file Form 709. A grandparent who writes a $50,000 check directly to the university files nothing, uses zero exemption, and the gift is entirely outside the estate with zero GST tax. If the grandchild is already in school, direct tuition payment dominates.
2. Making additional annual exclusion gifts in the 5-year superfunding window. After superfunding $95,000, the donor cannot make any additional annual exclusion gifts to the same beneficiary for 5 years. Additional gifts in years 2-5 of the election period will use lifetime exemption. Most grandparents don't track this correctly — the Form 709 election needs to be flagged and followed every year.
3. Funding a trust for multiple grandchildren with annual exclusion gifts without allocating GST exemption. A trust for multiple beneficiaries does not qualify for the GST annual exclusion automatically. Contributing $19,000/year to a trust for "my grandchildren" creates a transfer subject to GST tax unless you allocate GST exemption. Work with your advisor to structure properly.
4. Forgetting that portability doesn't apply to GST. Many surviving spouses who inherited a DSUEA (deceased spousal unused estate tax exemption) assume they also inherited GST exemption. They didn't. If the deceased spouse's GST exemption was never allocated, it's gone. This typically surfaces when the surviving spouse makes large gifts to grandchildren and the advisor discovers there's less GST exemption available than expected.
5. Using UTMAs for large transfers without considering kiddie tax and aid impact. A $200,000 UTMA account generates investment income taxed at the parent's marginal rate until the child is 19 (or 24 for students). That income is visible to the FAFSA as a student asset at 20%. A 529 or dynasty trust is almost always more tax-efficient for large transfers to minors.

Planning matrix: by estate size

Action checklist: grandparent estate planning

• Inventory all grandchildren (ages, education timelines, disability status)
• Calculate current annual exclusion capacity: $38,000/grandchild/year (married couple)
• Identify grandchildren with college enrollment in next 1–4 years — direct tuition payment strategy
• Review 529 plans: owned by you or the parents? Superfunding opportunity?
• Pull prior Form 709 returns — how much lifetime/GST exemption has been used?
• Review existing will and revocable trust: do any bequests go directly to grandchildren? GST exemption allocated?
• For $10M+ estates: discuss dynasty trust siting and funding with your advisor and estate attorney
• For surviving spouses: verify GST exemption was properly allocated on Form 706 at first death — portability does not carry GST exemption