Short answer: Yes, in more cases than most people think. “Irrevocable” doesn’t mean carved in stone. California gives you at least five ways to change or unwind one: all the beneficiaries plus the settlor consenting (Probate Code §§15403–15404), a court order when circumstances have changed (§15409), decanting the assets into a better trust (§§19501–19530), a nonjudicial settlement agreement, or a trust protector using powers the document already grants. Some of these you can do with paperwork; others need a judge.
Figures and code sections verified against the California Probate Code, 2026. This is general information, not legal advice for your situation.
Why “irrevocable” doesn’t mean untouchable
People hear “irrevocable” and assume they’re stuck forever. That’s not how California law works. An irrevocable trust is harder to change than a revocable living trust — the settlor gave up unilateral control on purpose — but “harder” is not “impossible.” The Probate Code was written with the understanding that families, tax laws, and asset values shift over decades, and a trust drafted in 1998 may make no sense in 2026.
The most common reason we see people wanting a change: an old AB trust, also called a bypass or credit-shelter trust. Back when the federal estate-tax exemption was under $1 million, splitting a couple’s estate into two trusts at the first death made real tax sense. Today the exemption is $15,000,000 per person and permanent under the One Big Beautiful Bill Act, and California has no state estate tax at all. A Camarillo couple with a $3 million estate who set up a mandatory AB split is now locking half their assets into an irrevocable subtrust for no tax benefit — and losing a second step-up in basis in the process. That’s exactly the kind of trust worth revisiting. If that’s your situation, our page on whether you still need your AB trust walks through it.
The five ways to change or undo one
- Everyone agrees (§§15403–15404). If the settlor is alive and all beneficiaries consent, you can modify or even terminate the trust — as long as it wouldn’t defeat a material purpose the settlor still wants protected. If the settlor has died, all beneficiaries can still petition to modify or terminate under §15403, but a court weighs whether ending it frustrates the point of the trust.
- Court modification for changed circumstances (§15409). When circumstances the settlor didn’t anticipate would defeat or substantially impair the trust’s purpose, a judge can modify it. This is the route for the outdated AB trust, a trust holding an asset that no longer exists, or terms that have become impractical.
- Decanting (§§19501–19530). California’s Uniform Trust Decanting Act, operative since January 1, 2019, lets a trustee with distribution authority “pour” the assets from an old irrevocable trust into a new one with cleaner terms — no court needed in many cases. Think of it like decanting wine into a fresh bottle.
- Nonjudicial settlement agreement. Interested parties can sign a written agreement resolving certain matters — interpreting terms, approving accountings, or filling gaps — without going to court, so long as it doesn’t violate a material purpose.
- Trust protector powers. Newer trusts often name a “trust protector” with specific powers to amend administrative terms, swap trustees, or adapt to tax-law changes. If your document has one, that may be the fastest fix of all.
A real Ventura County example
Say a Thousand Oaks widow is the survivor under a 2001 AB trust. At her husband’s death, $1.5 million was funneled into an irrevocable bypass trust. She can’t touch the principal freely, the assets won’t get a step-up when she dies, and there’s zero estate tax to avoid at today’s exemption. Her options: if the trust language and beneficiaries allow, the trustee might decant into a trust with broader distribution rights; or the family petitions the court under §15409 arguing the tax landscape that justified the split no longer exists. Either path can free up the assets and restore that second basis step-up. Neither is a DIY project.
What you honestly can’t do alone
Here’s the blunt part. You can’t just sign a paper declaring your irrevocable trust changed. Consent modifications need every beneficiary — including minor or unborn ones, who need a court-appointed representative. Court petitions need a lawyer and a judge. Decanting has statutory limits on what terms you can and can’t alter, and doing it wrong can trigger tax consequences a CPA needs to review. If the change is tax-driven, that’s a conversation to have with your accountant too — and if it’s outside our lane, Eric will tell you and refer you out for free.
Can an irrevocable trust really be changed in California?
Yes. Depending on the situation you can use beneficiary-and-settlor consent (Prob. Code §§15403–15404), a court petition for changed circumstances (§15409), decanting into a new trust (§§19501–19530), or a nonjudicial settlement. “Irrevocable” limits the settlor’s unilateral control — it does not lock the trust forever.
What is trust decanting in California?
Decanting is when a trustee with authority to distribute trust property pours the assets into a new trust with improved terms, under the California Uniform Trust Decanting Act (Prob. Code §§19501–19530, operative January 1, 2019). It can fix outdated or impractical provisions, sometimes without a court order — but the statute limits which terms you can change.
Can I dissolve an old AB or bypass trust that no longer saves taxes?
Often, yes. With the federal exemption at $15 million per person and no California estate tax, many AB trusts created for tax savings no longer serve that purpose. Families use §15409 court modification, decanting, or beneficiary consent to unwind or simplify them and recover a second step-up in basis. It depends on the exact language and who the beneficiaries are.
Do all the beneficiaries have to agree to change an irrevocable trust?
For a consent-based modification or termination under §§15403–15404, yes — every beneficiary must agree, and minor or unborn beneficiaries need a court-appointed representative. If you can’t get everyone on board, a court petition under §15409 for changed circumstances may still work without unanimous consent.
Do I need to go to court to modify an irrevocable trust?
Not always. Decanting, nonjudicial settlement agreements, and trust-protector powers can work without a judge. But modifications based on changed circumstances (§15409) and any change involving minor or unborn beneficiaries generally require a court petition.
The bottom line
If you’ve been told your irrevocable trust can never change, that’s not the whole truth. California gives you real tools — consent, court modification, decanting, settlement agreements, and protector powers — and the right one depends on who’s still living, who the beneficiaries are, and what you’re trying to fix. Old AB trusts built for a tax problem that no longer exists are the classic case worth a second look. If you’re wondering whether yours can be updated, talk to Eric and bring the document — a lot of what feels permanent turns out to be fixable. You may also want to read up on the difference between revocable and irrevocable trusts first.
Sources: Cal. Prob. Code §§15403–15404 (modification/termination by consent), §15409 (modification for changed circumstances), §§19501–19530 (California Uniform Trust Decanting Act, operative Jan. 1, 2019); One Big Beautiful Bill Act, P.L. 119-21 §70106; IRC §2010(c) ($15,000,000 exemption); IRC §1014 (step-up in basis).
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