Alaska: Prenuptial Agreement Requirements

Requirements one by one

Alaska uses a Statute of Frauds plus case law

Alaska has no comprehensive premarital-agreement act. Alaska Statute
§ 09.25.010(a)(5) puts an agreement made upon consideration of marriage within
the Statute of Frauds, while Andrew B. v. Abbie B. and Kilkenny v. Kilkenny
supply the current enforceability rules. Kilkenny expressly notes that Alaska
has not adopted the Uniform Premarital and Marital Agreements Act.

The cases nevertheless recognize valid prenups. Andrew B., following
Brooks v. Brooks, describes the baseline as agreements “legally procured and
ostensibly fair in result.”

The agreement must be written and subscribed

Section 09.25.010(a) makes the marriage-consideration agreement unenforceable
unless it, or a sufficient note or memorandum, is in writing and subscribed by
the party charged. A mutually enforceable agreement therefore should bear both
prospective spouses' signatures.

The bargain does not need separate monetary consideration. Andrew B. states
that marriage itself supplies consideration. Because the agreement is made in
contemplation of marriage, the contemplated marriage activates the marital
rights bargain.

No special notary, witness, or recording formality applies

The governing Alaska form statute requires a writing subscribed by the party
against whom enforcement is sought. It does not add a prenup-specific notary,
acknowledgment, witness, oath, attestation, or recording requirement for basic
enforcement between the parties.

Separate documents used to transfer or record real property may have their own
formalities. Those instrument rules are not universal execution conditions for
the prenup itself.

Disclosure is part of procedural fairness

Alaska's prenup cases do not use an UPAA statutory disclosure checklist.
Instead, Andrew B. confirms that misrepresentation or nondisclosure of a
material fact can make a premarital agreement unenforceable. The opportunity
and time to review financial disclosures also inform whether execution was
voluntary.

Estate-right waivers have a separate statute. Section 13.12.213 allows a signed
written waiver of elective-share and allowance rights, but makes the waiver
vulnerable when it was involuntary or was unconscionable at execution together
with the listed disclosure, written-waiver, and adequate-knowledge failures.
That probate rule should not be turned into a general UPAA provision for every
divorce term.

Counsel and timing are fact-specific voluntariness factors

Alaska has no fixed statutory number of review days and does not require that
each person actually retain counsel in every case. But Andrew B. makes three
considerations essential: time to review, the ability and opportunity to consult
independent counsel meaningfully, and the ability to understand the terms.

No single factor controls. Kilkenny confirms that courts assess their combined
effect when deciding whether signing was truly voluntary.

Courts review fairness at signing and enforcement

The fairness source is case law. Kilkenny describes the inquiry as both
procedural—whether the agreement was freely made—and substantive—whether its
terms were unconscionable. An involuntary agreement cannot be enforced.

Even a valid agreement receives an enforcement-time review. A court may ask
whether circumstances changed during the marriage so that enforcement became
unfair and unreasonable. If only certain terms fail that test, Kilkenny allows
the court to strike those terms without voiding the entire agreement. The court
may not add a promise the parties never made.

A support restriction is not absolute

Alaska law permits a prenup to contain a prospective-support restriction, but
the term remains within the case-law fairness review. In Kilkenny, domestic
violence and coercive financial dynamics supported nonenforcement of terms that
barred prospective support, attorney's fees, and unequal property division.

Section 25.24.160 separately authorizes divorce maintenance that is just and
necessary. Whether a particular prenup restriction displaces that default power
depends on voluntariness, execution-time fairness, and the later-circumstances
review.

Child support and custody remain court matters

Alaska Stat. § 25.24.160(a)(1)-(2) authorizes the court to order just and proper
contributions toward children's nurture and education. Section 25.24.150 keeps
custody and visitation orders with the court and requires a best-interests
determination. A prenup therefore cannot conclusively set the child's support or
bind the court's custody decision.

More specifically, § 25.24.150(a) permits the court to make, modify, or vacate
custody and visitation orders during the child's minority, while subsection (c)
requires the best-interests analysis.

Domestic violence also matters beyond custody. Kilkenny shows that violence
and resulting coercive control may be changed circumstances making enforcement
of financial terms unfair or unreasonable.

A post-marriage change enters the postnuptial-contract lane

Alaska has no prenup-specific statute prescribing amendment or revocation.
Estate of Lampert recognizes a postnuptial estate-planning agreement as a
valid contract governed by ordinary contract rules. The parties there jointly
amended and later reaffirmed their agreement; a spouse's later unilateral
unraveling of a pivotal term supported rescission.

When the change waives surviving-spouse elective-share or allowance rights,
§ 13.12.213 independently requires a signed written contract, agreement, or
waiver. A generic notarized amendment clause is not a substitute for the
applicable contract and fairness analysis.

What trips people up

• Alaska is not a uniform-act state. Similarity between Alaska's cases and
  uniform-act concepts does not mean Alaska enacted UPAA or UPMAA.
• Actual counsel and meaningful access to counsel are different. The cases
  focus on a real opportunity to obtain and consider independent advice, along
  with time and understanding.
• Enforcement can be term-specific. Changed circumstances may justify
  striking a support or property restriction without erasing every provision.

Common questions

Must an Alaska prenup be notarized?

The cited Alaska Statute of Frauds requires a writing subscribed by the party
charged, not notarization. A notary can help prove execution, and a separate
real-property instrument may require acknowledgment, but neither point creates
a universal prenup-validity rule.

Is there a minimum number of days before the wedding?

No fixed period appears in Alaska's governing framework. Timing still matters:
Andrew B. requires courts to consider the amount of time available to review
the agreement as part of voluntariness.

Can a court enforce some terms and reject others?

Yes. Kilkenny holds that a court may selectively strike terms made unfair or
unreasonable by changed circumstances, provided it explains the term-by-term
result and does not rewrite the agreement by adding new promises.

Statutes and sources

• Alaska Stat. § 09.25.010(a)(5) — writing and subscription for an
  agreement made upon consideration of marriage. Official Alaska Legislature
  text
  (accessed 2026-07-28).
• Alaska Stat. § 13.12.213 — signed waivers of surviving-spouse rights and
  the probate disclosure/unconscionability test. Official Alaska Legislature
  text
  (accessed 2026-07-28).
• Andrew B. v. Abbie B., 494 P.3d 522 (Alaska 2021), and Kilkenny v.
  Kilkenny, Alaska Supreme Court Opinion No. 7787 (2025) — voluntariness,
  counsel and timing factors, execution fairness, changed circumstances, and
  selective enforcement. Andrew B.
  and Kilkenny (accessed
  2026-07-28).
• Alaska Stat. §§ 25.24.150-.160 — custody, best interests, child support,
  and maintenance authority. Official §
  25.24.150
  and official §
  25.24.160
  (accessed 2026-07-28).
• Estate of Lampert v. Estate of Lampert, 896 P.2d 214 (Alaska 1995) —
  postnuptial estate-plan contract treatment, amendment history, material breach,
  and rescission. Opinion
  (accessed 2026-07-28).