Missouri prenup checklist.

Signing formalities

Confirm the complete agreement and every incorporated schedule use the required form and signatures.

• Mo. Rev. Stat. § 451.220 · A marriage contract affecting an estate must be in writing and acknowledged or proved in the manner Missouri law specifies.
• Mo. Rev. Stat. § 432.010 · An agreement made upon consideration of marriage, other than mutual promises to marry, must be written and signed by the party to be charged.

Acknowledgment

Check whether the agreement or a related instrument uses an acknowledgment, notarization, witness, or recording formality.

No separate source record is catalogued for this topic. That is a research-coverage statement, not a claim that no applicable law exists.

Effective date

Identify the event and date on which the agreement says it becomes effective.

• Mo. Rev. Stat. §§ 432.010, 451.220 · Missouri's statutory text addresses contracts made in consideration or contemplation of marriage, so occurrence of the contemplated marriage and the execution chronology matter.
• Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998); Mo. Rev. Stat. §§ 432.010, 451.220 · Missouri has not enacted a UPAA or UPMAA applicability schedule; execution date and then-current statutes and common law govern historical instruments.
• Ferry v. Ferry, 586 S.W.2d 782 (Mo. Ct. App. 1979); Wilson v. Wilson, 354 S.W.2d 532 (Mo. Ct. App. 1962) · Older Missouri cases remain useful on disclosure, duress, and public policy but must be read through Miles and current statutes.

Permitted subjects

Map each material clause to a subject the cited authorities address and flag terms requiring separate authority.

• Gould v. Rafaeli, 822 S.W.2d 494 (Mo. Ct. App. 1991) · Missouri permits premarital agreements to address property and financial consequences of dissolution, subject to execution safeguards and mandatory law.

Property

Reconcile property labels with title, income, appreciation, debt, and disposition terms.

• Whitenton v. Whitenton, 659 S.W.2d 542 (Mo. Ct. App. 1983) · Missouri applies contract construction to determine which property and rights the executed language covers after validity is established.
• Whitenton v. Whitenton, 659 S.W.2d 542 (Mo. Ct. App. 1983); Mo. Rev. Stat. ch. 452 · Later title, transfers, joint use, and tracing may affect whether an asset remains within a separate-property clause.
• Mo. Rev. Stat. § 474.120 · An intestate surviving-spouse waiver requires a written agreement, full disclosure of legal rights and all property interests, and fair consideration under section 474.120.
• Mo. Rev. Stat. § 474.220 · A surviving spouse may waive the right to elect against a will through a written signed agreement after full disclosure of the right and fair consideration.

Spousal support

Identify every support waiver, cap, formula, review event, and enforcement-time safeguard.

• Gould v. Rafaeli, 822 S.W.2d 494 (Mo. Ct. App. 1991) · A premarital agreement may address maintenance, but enforceability depends on the agreement text, Miles safeguards, and current statutory limits.

Children and support

Flag any term that attempts to predetermine child support, custody, or another child-related decision.

• Mo. Rev. Stat. § 452.375 · A court must decide custody under current statutory best-interest requirements and required findings rather than treat an advance private allocation as conclusive.
• Mo. Rev. Stat. § 452.340 · Child-support duties and duration remain governed by current Missouri statute and judicial review despite a private financial agreement.

Amendment and revocation

Confirm every claimed amendment or revocation is complete and follows the applicable form.

• Mo. Rev. Stat. §§ 432.010, 451.220; Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998) · Missouri has no enacted uniform-act amendment section; a claimed later change must satisfy the agreement, contract law, and every applicable writing or acknowledgment rule.

Voluntariness

Build a factual timeline of drafts, negotiations, pressure, capacity, language access, and signing.

• Mo. Rev. Stat. § 451.220 annotations; Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998) · Miles supplies the modern Missouri formulation for voluntary, fair, knowing, understanding, good-faith execution with full disclosure and absence of unconscionability.
• Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998) · A Missouri premarital agreement must be entered freely, fairly, knowingly, understandingly, in good faith and with full disclosure, and it must not be unconscionable.
• Whitenton v. Whitenton, 659 S.W.2d 542 (Mo. Ct. App. 1983); Wilson v. Wilson, 354 S.W.2d 532 (Mo. Ct. App. 1962) · Threats, wedding pressure, bargaining disparity, concealment, and overreaching may undermine the free and fair execution Missouri requires.

Financial disclosure

Compare the agreement and schedules against assets, debts, income, business interests, trusts, and any waiver.

• Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998) · Missouri's fairness inquiry requires full disclosure of the nature and extent of property interests material to the bargain.
• Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998) · Actual knowledge, education, business experience, and participation in drafting may bear on whether the signer understood the disclosed interests and waived rights knowingly.
• Mo. Rev. Stat. §§ 474.120, 474.220 · Missouri's intestate-waiver provision calls for disclosure of legal rights and all property interests, while the testate-election provision separately addresses disclosure of the right waived.

Independent counsel

Record who advised each party, when advice occurred, and which draft was reviewed.

• Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998); Gould v. Rafaeli, 822 S.W.2d 494 (Mo. Ct. App. 1991) · Access to conflict-free counsel, advice actually received, and the opportunity to revise the draft are important evidence of knowing and voluntary execution.

Timing

Measure the time between first draft, material revisions, legal review, wedding, and signing.

• In re Marriage of Thomas, 199 S.W.3d 847 (Mo. Ct. App. 2006); Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998) · Missouri has no fixed premarital waiting period; draft delivery, wedding proximity, counsel access, negotiation, and practical alternatives are assessed together.

Public assistance

Identify support terms that could interact with public-benefit eligibility at enforcement.

No separate source record is catalogued for this topic. That is a research-coverage statement, not a claim that no applicable law exists.

Void marriage

Identify whether the agreement addresses a marriage later determined to be void.

No separate source record is catalogued for this topic. That is a research-coverage statement, not a claim that no applicable law exists.

Other limitations

Identify severability, limitations, public-policy, choice-of-law, and other enforcement boundaries.

• Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998) · Even an otherwise knowing agreement must not be unconscionable under Missouri's premarital-enforcement framework.
• Miles v. Werle, 977 S.W.2d 297 (Mo. Ct. App. 1998); Ferry v. Ferry, 586 S.W.2d 782 (Mo. Ct. App. 1979) · Prospective spouses must deal candidly and in good faith when allocating marital, support, and estate rights.