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Prenuptial Agreement Laws in Montana

Montana has adopted the Uniform Premarital Agreement Act; lack of financial disclosure matters only if the agreement was also unconscionable when signed, and the statute sets no waiting period or lawyer requirement.

Last checked . General information, not legal advice.

Montana at a glance

Uniform act
UPAA (Mont. Code Ann. 40-2-601 to 40-2-610)
Adopted in 1987.
Financial disclosure required
Only if also unconscionable
Lack of disclosure counts only if the agreement was also unconscionable when signed and there was no written waiver or adequate knowledge.
Waiting or review period
No statutory waiting period
The statute sets no minimum time between receiving and signing the agreement.
Independent counsel required
No
The statute's enforcement test does not list independent counsel as a requirement.

Sources

Last checked

The rules in Montana

Has Montana adopted the Uniform Premarital Agreement Act or a similar uniform law?

Uniform act in Montana: UPAA (Mont. Code Ann. 40-2-601 to 40-2-610). Adopted in 1987.

Does a prenuptial agreement in Montana require financial disclosure to be enforceable?

Only if also unconscionable. Financial disclosure required in Montana: only if also unconscionable. Lack of disclosure counts only if the agreement was also unconscionable when signed and there was no written waiver or adequate knowledge.

Is there a waiting or review period before signing a prenup in Montana?

Waiting or review period in Montana: No statutory waiting period. The statute sets no minimum time between receiving and signing the agreement.

Does Montana law require each party to have an independent lawyer for a prenuptial agreement?

No. Independent counsel required in Montana: no. The statute's enforcement test does not list independent counsel as a requirement.

Where do the Montana prenuptial agreement laws come from?

The rules above come from Mont. Code Ann. 40-2-608. Each source is linked on this page. We last checked them in October 2026.

Good to know

An agreement is also unenforceable if the challenging party proves it was not signed voluntarily.

What this means in practice

Sign well before the wedding. Courts may look closely at an agreement presented shortly before the ceremony, and some states set a minimum time between receiving the final draft and signing it. Leaving time to read, ask questions and negotiate helps show the agreement was entered voluntarily.

Exchange full financial information in writing. A schedule of each party's assets, debts and income attached to the agreement creates a record of what was disclosed. Where a party gives up the right to more information, that waiver should usually be in writing and signed as well.

Consider separate lawyers for each party. Even where independent counsel is not strictly required, having each person advised by their own attorney can make the agreement harder to challenge later. Terms about child support or custody are generally not binding, and spousal support waivers can face extra scrutiny, so a local attorney can confirm what is allowed.

General information, not legal advice. Laws change, and cities can add their own rules, so check the current statute before you rely on it.