Missouri does not use a fixed alimony calculator or formula to determine spousal maintenance. Under Mo. Rev. Stat. § 452.335, courts evaluate nine statutory factors — including marriage length, earning capacity, and standard of living — to set both the amount and duration of maintenance awards. Senate Bill 562, effective August 28, 2025, introduced statutory duration caps that limit most maintenance awards to the lesser of 50% of the marriage length or 15 years. Filing for divorce in Missouri costs $133 to $178 depending on the county, and at least one spouse must have lived in Missouri for 90 days before filing.
Key Facts: Missouri Spousal Maintenance at a Glance
| Factor | Detail |
|---|---|
| Governing Statute | Mo. Rev. Stat. § 452.335 |
| Filing Fee | $133–$178 (varies by county; as of March 2026, verify with your local clerk) |
| Residency Requirement | 90 days in Missouri (Mo. Rev. Stat. § 452.305) |
| Waiting Period | 30 days from filing date |
| Grounds for Divorce | No-fault only (marriage is "irretrievably broken") |
| Property Division | Equitable distribution (not necessarily 50/50) |
| Maintenance Formula | No fixed formula; court discretion based on 9 statutory factors |
| Duration Cap (Post-SB 562) | Lesser of 50% of marriage length or 15 years |
| Tax Treatment | Not deductible by payor, not taxable to recipient (post-2018 divorces) |
| Recent Reform | SB 562, signed March 26, 2025, effective August 28, 2025 |
How Does Missouri Calculate Alimony in 2026?
Missouri courts do not use a mathematical alimony calculator to determine spousal maintenance. Under Mo. Rev. Stat. § 452.335(2), judges exercise broad discretion by weighing nine statutory factors on a case-by-case basis. Unlike child support, which follows Form 14 guidelines with specific income percentages, spousal maintenance in Missouri has no standardized formula, making outcomes highly dependent on the individual circumstances of each case.
The nine factors Missouri courts evaluate under Mo. Rev. Stat. § 452.335(2) are:
- Financial resources of the spouse seeking maintenance, including marital property apportioned to them and their ability to meet needs independently
- Time necessary to acquire sufficient education or training to find appropriate employment
- Comparative earning capacity of each spouse
- Standard of living established during the marriage
- Obligations and assets of each party, including both marital and separate property
- Duration of the marriage
- Age and physical and emotional condition of the spouse seeking maintenance
- Ability of the paying spouse to meet their own needs while making maintenance payments
- Conduct of the parties during the marriage
Before a court awards any maintenance, it must first find that the requesting spouse either lacks sufficient property to provide for their reasonable needs or is unable to support themselves through appropriate employment. Missouri courts treat maintenance as a secondary remedy — property division comes first, and maintenance fills the remaining gap.
What Changed Under SB 562 (Effective August 28, 2025)?
Senate Bill 562, signed by Governor Mike Kehoe on March 26, 2025, represents the most significant reform to Missouri spousal maintenance law in decades. The law took effect on August 28, 2025, and applies to all new divorce filings and modification requests decided on or after that date. SB 562 codified three distinct maintenance types, established statutory duration caps, and simplified the modification standard — replacing decades of informal judicial guidelines with binding statutory frameworks.
SB 562 created three formal categories of spousal maintenance in Missouri:
- Bridge Maintenance: Designed for short-term marriages (under 7 years) to address legitimate, identifiable short-term needs. Bridge maintenance is capped at a maximum duration of 2 years and is not modifiable in amount or duration once ordered.
- Rehabilitative Maintenance: Available for short-term (under 7 years) and moderate-term (7 to 17 years) marriages. Rehabilitative maintenance requires a specific, defined rehabilitative plan and is capped at 4 years. Courts may modify rehabilitative maintenance upon a substantial change in circumstances, noncompliance with the rehabilitative plan, or completion of the plan.
- Durational Maintenance: Reserved for moderate-term (7 to 17 years) and long-term (17+ years) marriages. Durational maintenance provides for needs as established during the marriage. Duration caps apply based on the length of the marriage.
How Long Does Alimony Last in Missouri Under the New Duration Caps?
Under SB 562, Missouri maintenance duration is now capped at the lesser of 50% of the marriage length or 15 years. For a 20-year marriage, the maximum maintenance duration is 10 years. For a 10-year marriage, the maximum is 5 years. These caps represent binding statutory limits that courts must follow unless exceptional circumstances justify deviation, replacing the informal judicial practice of awarding maintenance for one-third to one-half the length of the marriage.
| Marriage Duration | Maintenance Type | Maximum Duration |
|---|---|---|
| Under 3 years | Rarely awarded | Case-by-case |
| 3–7 years | Bridge | 2 years |
| 3–7 years | Rehabilitative | 4 years |
| 7–10 years | Durational | 5 years |
| 10–12 years | Durational | 5 years |
| 12–17 years | Durational | 7 years |
| 17+ years | Durational | 10 years |
| Any length (default cap) | Any type | Lesser of 50% of marriage or 15 years |
SB 562 also includes a retroactivity provision. Either party in an existing maintenance order may file to modify the order to conform with the new statutory categories and duration caps. This presumption in favor of modification means that pre-2025 maintenance orders paying indefinite maintenance may now be subject to the new duration limits upon a proper motion.
How to Estimate Spousal Maintenance in Missouri Without an Official Calculator
While Missouri has no official alimony calculator, attorneys and financial planners commonly use informal estimation methods to predict likely maintenance outcomes. A widely referenced guideline suggests maintenance of 20% to 25% of the income difference between spouses, awarded for 30% to 50% of the marriage duration. For example, if one spouse earns $120,000 annually and the other earns $40,000, the $80,000 income gap could produce estimated monthly maintenance of $1,333 to $1,667 (20% to 25% of the $80,000 difference, divided by 12 months).
These estimation steps provide a starting framework:
- Calculate the gross monthly income of each spouse from all sources
- Determine the income gap between the higher-earning and lower-earning spouse
- Apply an estimated percentage of 20% to 25% to the income difference
- Consider the marriage duration to estimate the likely award period using the SB 562 caps
- Adjust for specific statutory factors such as the requesting spouse's employability, health conditions, and contributions as a homemaker
- Factor in the property division — a spouse receiving a larger share of marital assets may receive less maintenance
These percentages are informal guidelines, not binding rules. Missouri judges retain full discretion to award more or less than any calculator estimate. An alimony calculator for Missouri can provide a ballpark figure, but the actual court award depends on the specific facts presented and the judge's interpretation of the Mo. Rev. Stat. § 452.335 factors.
What Are the Missouri Residency and Filing Requirements for Divorce?
At least one spouse must have been a resident of Missouri for a minimum of 90 days immediately preceding the filing of the divorce petition, as required by Mo. Rev. Stat. § 452.305(1). Missouri imposes a 30-day mandatory waiting period from the date the petition is filed before a court may enter a final dissolution judgment. Filing fees range from $133 in smaller counties to $178 in Jackson County, with additional costs of approximately $25 for service of process through the sheriff.
Missouri is a purely no-fault divorce state. The only ground for dissolution is that the marriage is "irretrievably broken" with no reasonable likelihood of preservation. Missouri courts do not require proof of adultery, abandonment, cruelty, or any other fault-based ground. Either spouse may file for divorce by demonstrating the irretrievable breakdown of the marriage. Military personnel stationed in Missouri satisfy the 90-day residency requirement even without establishing domicile in the state.
Fee waivers are available for individuals who cannot afford the filing costs. A petitioner may file a "Motion and Affidavit in Support of Request to Proceed As a Poor Person" to request the court waive filing fees based on financial hardship.
How Does Property Division Affect Spousal Maintenance in Missouri?
Missouri is an equitable distribution state, meaning courts divide marital property fairly but not necessarily equally under Mo. Rev. Stat. § 452.330. Property division directly affects maintenance calculations because courts first allocate marital assets and then determine whether the requesting spouse still has unmet financial needs. A spouse who receives a larger share of marital property — such as the family home, retirement accounts, or business interests — may receive a lower maintenance award or no maintenance at all.
The relationship between property division and maintenance operates as a two-step analysis in Missouri courts:
- The court divides all marital property equitably between the spouses
- The court then evaluates whether the requesting spouse's share of marital property, combined with their earning capacity, is sufficient to meet their reasonable needs
- Only if a gap remains between the spouse's resources and their reasonable needs does the court award maintenance
Missouri courts classify property as either marital or separate. Marital property includes all assets acquired during the marriage regardless of title, while separate property includes assets owned before marriage, inherited property, and gifts received by one spouse individually. The equitable distribution process considers each spouse's economic circumstances, contributions to the marriage (including homemaking), and the value of nonmarital property already held by each party.
How Are Alimony Payments Taxed in Missouri?
For all Missouri divorces finalized after December 31, 2018, spousal maintenance payments are not deductible by the paying spouse and are not taxable income for the receiving spouse. This federal tax rule, established by the Tax Cuts and Jobs Act of 2017 (Public Law 115-97), permanently eliminated the alimony tax deduction and applies to all states including Missouri. Divorces finalized on or before December 31, 2018, continue under the old rules where the payor deducts payments and the recipient reports them as income.
The tax treatment change has significant implications for Missouri alimony calculator estimates and settlement negotiations:
- For the paying spouse, maintenance payments come from after-tax dollars, effectively increasing the real cost of each payment by their marginal tax rate (22% to 37% for most filers)
- For the receiving spouse, maintenance payments are tax-free, increasing the real value of each dollar received
- Settlement negotiations should account for the after-tax cost to the payor and after-tax benefit to the recipient when structuring maintenance amounts
- Missouri does not impose any separate state-level tax treatment that differs from the federal rules
For divorces involving high-income earners in Missouri, where combined state and federal marginal tax rates can reach 42% to 43% (37% federal plus Missouri's top rate of 4.8% under 2026 rates), the after-tax cost of a $5,000 monthly maintenance payment effectively rises to approximately $8,620 in pre-tax earnings needed to fund that payment.
When Can Missouri Spousal Maintenance Be Modified or Terminated?
Missouri spousal maintenance automatically terminates upon the death of either party or the remarriage of the receiving spouse, unless the parties expressly agreed otherwise in writing under Mo. Rev. Stat. § 452.370. Cohabitation by the receiving spouse does not automatically terminate maintenance in Missouri — the paying spouse must file a formal modification motion and prove the cohabitation has caused a substantial and continuing economic change in circumstances.
Under the simplified modification standard introduced by SB 562, either party may now seek modification by demonstrating "substantial and continuing changed circumstances." The previous standard required showing that changed circumstances were "so substantial and continuing as to make the terms unreasonable" — a higher bar that SB 562 deliberately lowered. This change makes it easier for either party to request modifications when circumstances genuinely change.
Key modification and termination rules in Missouri include:
- The original court order must explicitly state whether maintenance is modifiable or non-modifiable
- Bridge maintenance (under SB 562) is never modifiable in amount or duration
- Rehabilitative maintenance may be modified upon substantial change, noncompliance with the rehabilitation plan, or plan completion
- Durational maintenance may be modified based on substantial and continuing changed circumstances
- Either party may file to reclassify existing pre-SB 562 maintenance orders under the new statutory categories
- The court considers all financial resources of both parties, including shared living expenses with a cohabiting partner, when evaluating modification requests
Contested vs. Uncontested Divorce: Timeline and Cost Comparison in Missouri
An uncontested divorce in Missouri, where both spouses agree on all issues including maintenance, typically costs $1,500 to $5,000 in total legal fees and takes 60 to 90 days from filing to final judgment. A contested divorce involving disputes over spousal maintenance, property division, or child custody costs $10,000 to $50,000 or more and takes 6 to 18 months to resolve. The 30-day mandatory waiting period under Mo. Rev. Stat. § 452.305 applies to both contested and uncontested cases.
| Factor | Uncontested Divorce | Contested Divorce |
|---|---|---|
| Total Legal Costs | $1,500–$5,000 | $10,000–$50,000+ |
| Timeline | 60–90 days | 6–18 months |
| Court Appearances | 1 (prove-up hearing) | Multiple hearings + possible trial |
| Maintenance Agreement | Negotiated between parties | Decided by judge after evidence |
| Attorney Fees | Flat fee common | Hourly billing ($200–$400/hr) |
| Filing Fee | $133–$178 | $133–$178 (same) |
| Discovery/Experts | Rarely needed | Financial experts, vocational evaluators |
When spousal maintenance is the primary contested issue, both parties typically retain forensic accountants or vocational rehabilitation experts. A vocational evaluation, which assesses the requesting spouse's earning capacity and employability, costs $2,000 to $5,000 in Missouri. Forensic accounting to trace separate versus marital property and calculate accurate income figures costs $3,000 to $10,000 depending on the complexity of the marital estate.
Frequently Asked Questions About Alimony in Missouri
Does Missouri have an official alimony calculator?
Missouri does not have an official alimony calculator or spousal maintenance formula. Unlike child support, which follows Form 14 income-share guidelines, maintenance is determined entirely at the court's discretion based on nine factors listed in Mo. Rev. Stat. § 452.335(2). Online spousal support calculators can provide rough estimates but carry no legal authority in Missouri courts.
How much alimony will I pay or receive in Missouri?
Missouri maintenance amounts typically range from 20% to 25% of the income difference between spouses, though this is an informal guideline, not a statutory formula. For a couple where one spouse earns $150,000 and the other earns $50,000, estimated monthly maintenance would be $1,667 to $2,083. The actual amount depends on the nine factors in Mo. Rev. Stat. § 452.335(2) and the specific circumstances of the case.
How long does alimony last in Missouri after SB 562?
Under SB 562, effective August 28, 2025, Missouri maintenance is capped at the lesser of 50% of the marriage duration or 15 years. A 20-year marriage yields a maximum of 10 years of durational maintenance. Bridge maintenance for short-term marriages is capped at 2 years, and rehabilitative maintenance is capped at 4 years. These caps apply to all new orders and may retroactively apply to existing orders upon a modification motion.
Can I modify alimony in Missouri?
Yes, Missouri allows modification of spousal maintenance under Mo. Rev. Stat. § 452.370 when either party demonstrates substantial and continuing changed circumstances. SB 562 simplified this standard from the previous higher threshold. Bridge maintenance is the sole exception — it cannot be modified in amount or duration once ordered. Either party may also file to reclassify existing maintenance orders under the new SB 562 categories.
Does remarriage end alimony in Missouri?
Remarriage of the receiving spouse automatically terminates spousal maintenance in Missouri under Mo. Rev. Stat. § 452.370, unless the original divorce agreement expressly provides otherwise in writing. Remarriage of the paying spouse does not automatically terminate the obligation. The paying spouse must file for modification and demonstrate that the new financial obligations constitute a substantial and continuing change in circumstances.
Does cohabitation affect alimony in Missouri?
Cohabitation does not automatically terminate spousal maintenance in Missouri. The paying spouse must file a formal modification motion and prove that the receiving spouse's cohabitation has caused a substantial and continuing economic change in circumstances under Mo. Rev. Stat. § 452.370. Courts examine whether the cohabiting partner shares living expenses, contributes to household costs, or otherwise reduces the receiving spouse's financial needs.
What is the filing fee for divorce in Missouri?
Missouri divorce filing fees range from $133 to $178 depending on the county. Jackson County charges $177.50, St. Louis County charges approximately $148.50, and smaller counties such as Morgan County charge around $132.50. As of March 2026, verify with your local clerk. An additional $25 applies for service of process. Fee waivers are available for those who demonstrate financial hardship.
Is alimony taxable in Missouri?
For Missouri divorces finalized after December 31, 2018, spousal maintenance is not deductible by the paying spouse and not taxable as income for the receiving spouse. The Tax Cuts and Jobs Act of 2017 permanently eliminated the alimony tax deduction at the federal level, and Missouri follows the federal treatment. Divorces finalized on or before December 31, 2018, continue under the prior rules where the payor deducts payments and the recipient reports them as taxable income.
How does SB 562 affect existing Missouri maintenance orders?
SB 562 includes a retroactivity provision creating a presumption in favor of modifying existing maintenance orders to conform with the new law. Either party may file a motion to reclassify an existing maintenance order as bridge, rehabilitative, or durational maintenance under the new statutory framework. This means indefinite maintenance orders entered before August 28, 2025, may now be subject to the new duration caps if the paying spouse files for modification.
What factors matter most in a Missouri alimony case?
Missouri courts consistently emphasize three factors above others: the length of the marriage, the income disparity between spouses, and the requesting spouse's ability to become self-supporting through employment. A 25-year marriage with a stay-at-home spouse who sacrificed career development produces significantly higher maintenance awards than a 5-year marriage where both spouses maintained independent careers. Health conditions, age, and contributions as a homemaker also carry substantial weight under Mo. Rev. Stat. § 452.335(2).