Missouri Alimony / Spousal Support Estimator

Missouri has no formula for calculating spousal maintenance. Under RSMo § 452.335, judges use full discretion to determine the amount and duration based on ten statutory factors, including each spouse's financial resources, earning capacity, marriage duration, and standard of living. With median attorney rates of $280 per hour in Missouri, contested maintenance disputes can significantly increase the cost of a dissolution proceeding beyond the $10,000 median.

Missouri courts award three types of spousal maintenance under § 452.335. Temporary maintenance (pendente lite) provides support during the dissolution proceeding until the final order. Short-term or rehabilitative maintenance supports a spouse while they acquire education or job training to become self-sufficient. Modifiable long-term maintenance is reserved for spouses who cannot achieve financial independence due to age, health conditions, or disability after long-duration marriages.

Missouri law sets no statutory duration limits for spousal maintenance. Judges determine the appropriate length based on factors like the marriage duration, the recipient's ability to become self-supporting, and the time needed for education or training under RSMo § 452.335.2. The Missouri Court of Appeals has expressed a judicial preference for open-ended modifiable maintenance over fixed-term awards, meaning most orders continue until the recipient remarries, either spouse dies, or the court modifies the order.

Missouri courts evaluate ten factors under RSMo § 452.335.2: the requesting spouse's financial resources, time needed for education or training, comparative earning capacity, standard of living during the marriage, obligations and assets of each party, marriage duration, age and physical condition of the requesting spouse, the paying spouse's ability to meet their own needs while paying maintenance, and the conduct of both parties during the marriage. Judges weigh all factors together — no single factor is determinative.

Missouri spousal maintenance can be modified unless the court order specifically states it is non-modifiable. Under RSMo § 452.335.3, the party seeking modification must prove a substantial and continuing change in circumstances, such as job loss, disability, or a significant change in either spouse's income. Missouri courts have held that modifications cannot be based on speculation — the changed circumstances must be documented and ongoing before the original maintenance end date.

Adultery can influence spousal maintenance in Missouri, but it is not determinative. Under RSMo § 452.335.2(9), 'the conduct of the parties during the marriage' is one of ten statutory factors judges consider. Missouri courts take a holistic approach — an affair alone rarely changes the outcome unless it caused direct financial harm to the marriage. Misconduct involving financial waste or domestic violence typically carries more weight than infidelity in maintenance determinations.

For Missouri dissolutions finalized after January 1, 2019, spousal maintenance is no longer tax-deductible for the paying spouse and is not taxable income for the recipient under the federal Tax Cuts and Jobs Act (TCJA). Agreements finalized before December 31, 2018 retain the prior tax treatment unless specifically modified to adopt the new rules. This change eliminated the tax benefit that previously allowed divorcing couples to maximize total family income through the maintenance deduction.

Missouri law permits spouses to waive spousal maintenance in a prenuptial agreement, but courts evaluate 'substantive fairness' before enforcing such waivers. A waiver that leaves one spouse destitute while the other is financially secure may be challenged as unconscionable. Family law practitioners in Missouri recommend including flexible, tax-aware language in prenuptial agreements to account for changes like the 2019 TCJA elimination of the maintenance tax deduction, ensuring the agreement remains fair regardless of future tax law changes.