Missouri Spousal Support Calculator
Updated for Senate Bill 562 (Effective Aug 28, 2025) — Statutory Duration Caps & Maintenance Types
Use this free Missouri spousal support calculator to estimate monthly maintenance under Senate Bill 562, effective August 28, 2025. Whether your divorce is filed in St. Louis (St. Louis County), Kansas City (Jackson County), Springfield (Greene County), Columbia (Boone County), or anywhere else in Missouri, this tool applies the new statutory duration caps — Bridge, Rehabilitative, and Durational Maintenance — alongside income, needs, and county cost-of-living factors. Wondering how much maintenance you’ll pay in Missouri, how long it lasts under SB 562, or whether an old permanent order can be modified? Enter your details below for a step-by-step estimate. Always consult a licensed Missouri family law attorney or Missouri divorce lawyer for advice tailored to your case.
Income Information
Marriage Details
Marriage less than 7 years? (SB 562 short-term)
Marriage 20+ years?
Is recipient custodial parent?
Missouri-Specific Factors
Domestic violence involved?
Fault-based divorce?
Needs and Resources
Earning Capacity
Recipient sacrificed career for marriage?
Recipient has disability?
Important Legal Note: Updated for SB 562 (effective Aug 28, 2025). Missouri now has statutory duration caps for maintenance. Judges retain discretion over the amount. Not legal advice — consult an attorney.
Missouri Spousal Maintenance Results (SB 562)
Maintenance Type
Selected Type:
Monthly Amount
Guideline Amount:
Duration (Statutory Cap)
Recommended Duration:
Judicial Range
Likely Range:
Key Factors:
Disclaimer: Reflects Missouri SB 562 (2025). Estimates only — not legal advice. Consult an attorney.
Updated Missouri Maintenance Case Law
Cohabitation & Reduced Need
Davis v. Davis, 603 S.W.3d 854 (Mo. Ct. App. 2020)
Cohabitation with any adult housemate can reduce need; the payor must prove financial interdependence. Still relevant under SB 562.
Standard of Living in Long-Term Marriages
In re Marriage of Hanks, 370 S.W.3d 300 (Mo. Ct. App. 2012)
Long-term marriages (25 years) — standard of living remains a factor, but duration is now capped under SB 562 limits.
Modification of Permanent Maintenance
C.R.S. v. J.M.S., 668 S.W.3d 241 (Mo. App. W.D. 2023)
Pre-SB 562 case affirming that permanent maintenance may be modified upon a showing of substantial change; SB 562 now provides statutory caps for retroactive modification.
Modifying Maintenance Under SB 562
Under RSMo § 452.370, as amended by SB 562 (effective Aug 28, 2025), maintenance can be modified upon a showing of a substantial and continuing change in circumstances.
1. Legal Standards for Modification
Substantial and Continuing Change Required: The change must be material and ongoing — temporary fluctuations are insufficient (RSMo § 452.370).
SB 562 Duration Caps Apply Retroactively: Existing maintenance orders may be modified to comply with the new durational limits — presumptive retroactivity applies to indefinite/permanent maintenance orders entered before the law's effective date.
Automatic Termination on Remarriage: Maintenance automatically terminates upon the recipient's remarriage.
Cohabitation Is Not Automatic: Cohabitation does not automatically terminate maintenance, but the payor may seek modification if cohabitation reduces the recipient's demonstrated financial need (Davis v. Davis).
Permanent Maintenance Now Rare: SB 562 eliminated permanent maintenance except in rare disability cases — most existing "permanent" orders may now be subject to the new duration caps.
2. Common Grounds for Modification
Recipient's Remarriage: Automatic termination; payor should still file to formally close out the order.
Payor's Retirement at a Reasonable Age: A recognized ground for modification under RSMo § 452.370.
Significant Change in Income: For either party — job loss, pay reduction, or unexpected increase.
Proven Cohabitation: A reduction in the recipient's financial need arising from cohabitation, established through petition (Davis v. Davis).
SB 562 Compliance: Existing indefinite or permanent orders that exceed the new statutory duration caps (Bridge ≤2y, Rehabilitative ≤4y, Durational ≤50% of marriage length, max 15y).
3. Step-by-Step Modification Process
Step 1 – Gather Evidence: Tax returns, pay stubs, retirement account statements, proof of cohabitation and reduced financial need.
Step 2 – File a Motion for Modification: Submit under RSMo § 452.370 as amended, to the circuit court that entered the original order.
Step 3 – Serve Notice: Formally serve the other party per Missouri Rules of Civil Procedure.
Step 4 – Mediation: Many Missouri circuit courts encourage mediation before a contested hearing.
Step 5 – Court Hearing: If unresolved, present evidence before the circuit court.
Step 6 – Order on Modification: For SB 562 duration-cap compliance, presumptive retroactivity applies; other modifications generally apply from the filing date forward.
4. Critical Practical Considerations
Never stop paying without a court order: Doing so risks contempt and arrears accumulation.
Review pre-SB 562 orders promptly: Indefinite or permanent maintenance orders predating August 28, 2025 may now be subject to modification to comply with the new duration caps.
Document reduced need from cohabitation carefully: The standard from Davis v. Davis requires showing an actual reduction in the recipient's financial need, not merely that cohabitation is occurring.
Confirm which duration category applies: Bridge, Rehabilitative, or Durational — since each has a different statutory cap under SB 562.
RSMo § 452.370 | Missouri SB 562 (2025), effective Aug 28, 2025 | Davis v. Davis