Most married couples don’t know today whether they will owe estate tax when the second spouse dies. A disclaimer trust plan lets the surviving spouse make that decision later, with the tax law and asset values known at that time, instead of locking in a trust that may turn out to be unnecessary.
Disclaimer trust, in short: Everything passes to the surviving spouse, but the plan says that anything the survivor disclaims (refuses) goes into a trust that can still benefit the survivor and is not included in the survivor’s estate. The survivor has nine months after the first death to make a qualified disclaimer (26 U.S.C. § 2518), and can disclaim all, some or none of the assets.

Reviewed by Turner Henington, attorney and former KPMG tax accountant, Texas Bar No. 24148206 · Updated November 2026
A qualified disclaimer is treated as if the survivor never received the property, so it is not a gift by the survivor. To qualify under federal law (26 U.S.C. § 2518), the disclaimer must be:
Texas law on disclaimers is the Texas Uniform Disclaimer of Property Interests Act (Tex. Prop. Code ch. 240), which allows partial disclaimers by fraction, percentage or specific asset.
The surviving spouse can receive income and principal from the disclaimer trust for health, education, maintenance and support, and can often serve as trustee under that standard. The survivor generally cannot keep a power to decide who receives the trust after their death (Treas. Reg. § 25.2518-2(e)(2)), so the remainder beneficiaries, usually the children, are set in the plan.
| Option | Who decides | Growth sheltered from tax | New basis at second death |
|---|---|---|---|
| Portability only | Executor files Form 706 | No | Yes, on all assets |
| Disclaimer trust | Surviving spouse, within 9 months | Yes, on disclaimed assets | No, on disclaimed assets |
| Mandatory bypass trust | Set in the documents | Yes | No, on bypass assets |
| Clayton QTIP trust | Executor, up to 15 months | Yes, on non-elected assets | Yes, on elected assets |
Many plans combine these tools. A disclaimer plan works well when the couple trusts each other and wants simplicity. It is a poor fit for blended families, where a survivor might choose not to disclaim, or where the survivor is likely to need help managing assets.
We draft disclaimer provisions into revocable living trusts and wills, and after a death we advise the surviving spouse on whether and how much to disclaim, prepare the disclaimer, and coordinate the estate tax return with your CPA. See the Texas double step-up in basis for the income tax side of the decision.
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Nine months after the date of death for a qualified disclaimer under federal law, and the survivor must not accept the property or its benefits before disclaiming.
Yes. The survivor can receive distributions for health, education, maintenance and support, but generally cannot keep a power to change who receives the trust after their death.
It is more flexible, because the survivor decides after the first death. A mandatory bypass trust is more certain and better protects children in blended families. The right choice depends on the family and the size of the estate.
This page is general information, not tax or legal advice for your situation. Reading it does not create an attorney-client relationship.
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