If a marriage is declared invalid, an agreement that would otherwise have been a premarital agreement is enforceable only to the extent necessary to avoid an inequitable result.
Mont. Code Ann. § 40-2-609
Enforcement when marriage void
Known as the Uniform Premarital Agreement Act
The act spans §§ 40–40 (10 sections).
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.