California: Irrevocable Trust Modification and Termination Requirements

Requirements one by one

Settlor and all beneficiaries can act without court

Section 15404 creates California's direct written-consent route: “A trust may
be modified or terminated by the written consent of the settlor and all
beneficiaries without court approval.” The section does not make trustee
consent an additional condition.

If the settlor consents but a beneficiary does not, the remaining beneficiaries
may petition. The court may modify or partially terminate only if the
nonconsenting beneficiary's interests are not substantially impaired. That is a
court route, not a way to declare the missing consent irrelevant.

Beneficiaries acting without the settlor face a material-purpose test

Under § 15403, all beneficiaries may petition to modify or terminate. If
continuation is necessary for a material purpose, the court weighs the reason
for the requested change against the interest in accomplishing that purpose.

Termination receives a separate transfer-restraint rule. If the trust has a
valid restraint on transfer, the court must find good cause to terminate. The
statute does not say that every spendthrift term automatically prevents
modification.

Representation has route-specific limits

Section 15405 permits a guardian ad litem, in a court proceeding and when
appropriate, to consent for a beneficiary who lacks capacity, is a minor, or is
unascertained or unborn. The guardian may consider general family benefit to
living family members.

Current § 15804 allows listed fiduciary and substantially identical-interest
representation, but only without a conflict for the particular matter. Consent
given for another person must be written, and the settlor may not represent and
bind a beneficiary regarding modification or termination of an irrevocable
trust.

Changed circumstances require both lack of anticipation and impaired purpose

A trustee or beneficiary may petition under § 15409. The circumstances must
have been both unknown to and unanticipated by the settlor, and continuing the
existing terms must defeat or substantially impair accomplishment of the trust
purposes.

The court may change administrative or dispositive terms, terminate, or direct
otherwise unauthorized acts when necessary to carry out the purposes. A
transfer restraint is a factor but not the sole reason to deny relief.

Uneconomic trusts use two different routes

If principal does not exceed $100,000, § 15408(b) gives the trustee power to
terminate without a court order. The statute does not state a beneficiary-
notice or objection period as a condition of that subsection.

At any value, a trustee or beneficiary may petition when principal is so low
relative to administration cost that continuing the existing terms would
defeat or substantially impair the trust purposes. The court may terminate,
modify, or appoint a new trustee while conforming as nearly as possible to
settlor intention. A transfer restraint does not prevent either route.

The cited statutes do not create general mistake or tax-objective tests

Sections 15403–15410 do not state an ordinary mistake-of-fact-or-law
reformation test or a general tax-objective modification test. Section
17200(b)(15) is narrower: it concerns conforming an instrument for a federal
charitable estate-tax deduction. That specialized charitable provision falls
outside this survey's ordinary noncharitable scope.

This statutory answer does not decide whether separate equitable case law might
support relief on a particular record. It prevents § 15409's unanticipated-
circumstances test from being presented as if it were itself a general mistake
or tax-planning statute.

Petition notice and distribution depend on the route

For a court petition, § 17203 requires at least 30 days' hearing notice to all
trustees and beneficiaries. An affected person who is neither a trustee nor a
beneficiary receives the notice and petition through the stated civil-service
route. The direct written-consent and trustee small-trust routes do not require
court approval under §§ 15404(a) and 15408(b).

On termination by settlor-plus-beneficiary consent, property is distributed as
they agree. Otherwise, § 15410 follows the trust instrument or a court direction
that conforms as nearly as possible to expressed settlor intent. A trustee using
the $100,000 route may apply that standard without court and, if the instrument
and expressed intent do not resolve distribution, may distribute actuarially to
living beneficiaries.

What trips people up

• Filing a petition for a route that does not need one. Unanimous written
  consent under § 15404(a), and trustee termination under § 15408(b), operate
  without court approval.
• Treating all consent routes alike. Settlor-plus-beneficiary action,
  beneficiary-only action, and settlor consent with a missing beneficiary use
  different tests.
• Using $100,000 as the court's ceiling. It marks the trustee's noncourt
  power. The court route is a value-versus-cost test without that ceiling.
• Letting the settlor represent a beneficiary. Current § 15804 expressly
  bars that representation for irrevocable-trust modification or termination.
• Relabeling changed circumstances as mistake or tax authority. Section
  15409 states its own unknown-and-unanticipated circumstance and impaired-
  purpose requirements.

Common questions

Must the trustee sign a settlor-and-beneficiary agreement?

Section 15404(a) requires written consent of the settlor and all beneficiaries.
It does not list trustee consent as another statutory signer.

Can all beneficiaries end a trust over the settlor's material purpose?

They may petition. If continuation is necessary for a material purpose, the
court decides whether the reason for ending or changing the trust outweighs the
interest in accomplishing that purpose.

Can a trustee terminate a trust worth exactly $100,000?

Yes under the value language of § 15408(b), which applies when principal “does
not exceed” $100,000. Distribution still follows § 15410(e).

Does a spendthrift term block every route?

No. Beneficiary-only termination requires good cause when a valid transfer
restraint applies; changed-circumstance relief treats it as a factor; and the
uneconomic-trust section says it does not prevent application of that section.

Statutes and sources

• Cal. Prob. Code §§ 15403–15406 — beneficiary and settlor consent,
  material-purpose balancing, nonconsenting-interest protection, guardian-ad-
  litem consent, and class determination. Official California Legislative
  Counsel bulk code
  (accessed 2026-08-11).
• Cal. Prob. Code §§ 15407–15410 — termination events, the $100,000 trustee
  power, court cost-benefit and changed-circumstance routes, transfer
  restraints, and distribution. Official California Legislative Counsel bulk
  code (accessed
  2026-08-11).
• Cal. Prob. Code § 15804 — current representation, conflict, written-
  consent, and settlor-representation limits. Authenticated 2025 AB 565,
  Chapter 39
  (accessed 2026-08-11).
• Cal. Prob. Code §§ 17200 and 17203 — petition authority, the narrow
  charitable-deduction proceeding, 30-day hearing notice, and affected-person
  service. Official California Legislative Counsel bulk
  code (accessed
  2026-08-11).