Missouri is a no-fault divorce state where adultery is not required to obtain a dissolution of marriage, but infidelity can significantly impact spousal maintenance awards, property division outcomes, and custody arrangements under specific circumstances. Under RSMo § 452.320, if one spouse denies that the marriage is irretrievably broken, the court may consider adultery as evidence supporting dissolution. Courts also factor marital misconduct into maintenance decisions under RSMo § 452.335 and may adjust property division when an affair involved dissipation of marital assets under RSMo § 452.330. Filing fees range from $133 to $250 depending on county, with a mandatory 30-day waiting period before finalization.
Key Facts: Adultery Divorce in Missouri
| Factor | Missouri Law |
|---|---|
| Divorce Type | No-Fault (Irretrievably Broken) |
| Filing Fee | $133-$250 (varies by county) |
| Waiting Period | 30 days minimum |
| Residency Requirement | 90 days in Missouri |
| Adultery as Ground | Only if spouse denies marriage is broken |
| Impact on Alimony | Yes, as one of ten factors |
| Impact on Property | Yes, if assets were dissipated |
| Impact on Custody | Rarely, unless children affected |
| Property Division | Equitable Distribution |
| Governing Statute | RSMo Chapter 452 |
Is Missouri a No-Fault Divorce State?
Missouri operates exclusively as a no-fault divorce state, requiring only that the marriage be irretrievably broken with no reasonable likelihood of preservation under RSMo § 452.305. The petitioning spouse does not need to prove adultery, abandonment, or any other marital misconduct to obtain a dissolution. This no-fault approach has been Missouri law since the legislature eliminated traditional fault-based grounds decades ago to reduce litigation hostility and emotional damage to families.
The irretrievably broken standard means that one spouse must simply assert that the marriage cannot be saved. Courts generally accept this assertion without extensive inquiry when both parties agree. However, when the responding spouse contests this claim under oath, the divorce proceeding takes a different path that can bring adultery back into consideration.
When Does Adultery Matter in Missouri Divorce?
Adultery becomes legally relevant in Missouri when the responding spouse denies under oath that the marriage is irretrievably broken, triggering the court to examine five specific statutory factors under RSMo § 452.320. The first of these factors is that the respondent committed adultery and the petitioner finds it intolerable to continue living with the respondent. If the court finds this factor established, it may grant the dissolution despite the denial.
The five statutory factors Missouri courts consider when a spouse contests divorce include:
- The respondent committed adultery and the petitioner finds it intolerable to remain in the marriage
- The respondent behaved in such a way that the petitioner cannot reasonably be expected to continue cohabitation
- The respondent abandoned the petitioner for a continuous period of at least six months before filing
- The parties lived separate and apart by mutual consent for twelve continuous months before filing
- The parties lived separate and apart for twenty-four continuous months before filing regardless of consent
Missouri courts require proof of at least one of these factors if the respondent spouse contests the irretrievably broken claim. Failing to prove any factor results in the court refusing to dissolve the marriage, making adultery evidence potentially crucial in contested cases.
How Adultery Affects Spousal Maintenance in Missouri
Missouri courts consider marital conduct including adultery as one of ten statutory factors when determining spousal maintenance awards under RSMo § 452.335. Adultery may influence the amount or duration of maintenance payments, though Missouri judges balance this factor against the requesting spouse's financial need and the paying spouse's ability to pay. Courts typically will not deny maintenance to a financially dependent spouse solely because that spouse committed adultery, nor will they award punitive maintenance to punish an unfaithful spouse who can independently support themselves.
The ten factors Missouri courts weigh when awarding spousal maintenance include:
- Financial resources available to each party including marital property distribution
- Time necessary for the requesting spouse to acquire education or training for employment
- Comparative earning capacity of each spouse
- Standard of living established during the marriage
- Duration of the marriage
- Age and physical and emotional condition of each spouse
- Ability of the paying spouse to meet personal needs while paying maintenance
- Conduct of the parties during the marriage
- Custody of children and impact on employment capacity
- Other relevant factors the court deems appropriate
Missouri maintenance awards typically range from 20% to 33% of the difference between spousal incomes, with duration often calculated at one year of maintenance for every three years of marriage. Adultery may shift these calculations by 5-15% when the affair involved significant misconduct or financial waste.
Adultery and Property Division in Missouri
Missouri follows equitable distribution principles for marital property under RSMo § 452.330, meaning courts divide assets fairly though not necessarily equally. The statute explicitly lists the conduct of parties during the marriage as a relevant factor, allowing judges to consider adultery when determining what constitutes a just division. Courts possess broad discretion to adjust property allocations when an affair involved dissipation of marital assets.
Dissipation of marital assets occurs when one spouse spends marital funds on an extramarital affair without the other spouse's knowledge or consent. Common examples include:
- Purchasing gifts, jewelry, or vehicles for an affair partner
- Paying for hotel rooms, vacations, or travel with an affair partner
- Renting apartments or paying living expenses for an affair partner
- Transferring marital funds to an affair partner's accounts
- Accumulating credit card debt for affair-related expenses
Missouri applies a burden-shifting framework in dissipation cases established in Landewee v. Landewee, 515 S.W.3d 691 (Mo. 2017). The spouse alleging dissipation must first identify the wasted asset and provide supporting evidence. The accused spouse must then account for the missing asset and explain its disposition. Courts evaluate credibility and evidence to determine whether dissipation occurred and may award the innocent spouse a larger share of remaining marital property to compensate for the waste.
Does Adultery Affect Child Custody in Missouri?
Missouri courts determine child custody based solely on the best interests of the child under RSMo § 452.375, and adultery alone rarely affects custody outcomes. The 2023 amendments to Missouri custody law established a rebuttable presumption that equal or approximately equal parenting time serves children's best interests, and this presumption remains in effect for 2026. Adultery by one parent does not automatically rebut this presumption or disqualify that parent from custody.
Courts may consider adultery in custody matters only when the extramarital relationship demonstrably harmed the children or reflects negatively on the parent's fitness. Scenarios where adultery might influence custody include:
- Exposing children to inappropriate adult situations during the affair
- Introducing children to an affair partner who poses safety risks
- Neglecting parental duties or child supervision during the affair
- Using marital funds needed for children's expenses on an affair
- Creating household instability that negatively affected the children
Missouri courts examine moral fitness as one of eight statutory custody factors, but judges focus on how parental conduct affects children rather than punishing parents for infidelity. A parent who conducted a discrete affair that never impacted the children will likely face no custody consequences, while a parent whose affair created demonstrable harm to the children may see reduced parenting time.
Missouri Divorce Timeline: Uncontested vs. Contested
| Divorce Type | Minimum Timeline | Typical Timeline | Factors |
|---|---|---|---|
| Uncontested (no children) | 30-45 days | 60-90 days | Both parties agree on all terms |
| Uncontested (with children) | 30-60 days | 90-120 days | Parenting plan required |
| Contested (settles) | 6 months | 6-12 months | Negotiations or mediation |
| Contested (trial) | 12 months | 12-18+ months | Full discovery and trial |
| Default divorce | 30-45 days | 60-90 days | Spouse fails to respond |
Missouri requires a mandatory 30-day waiting period under RSMo § 452.305 between filing the petition and finalizing the dissolution. This waiting period cannot be waived even when both parties agree to all terms. The 30-day period begins on the filing date, not the service date, allowing couples to count time while the respondent is being served.
Contested divorces involving adultery allegations often take longer because discovery may include subpoenas for financial records, credit card statements, phone records, and other evidence documenting the affair and any associated spending. Depositions of affair partners sometimes occur in high-conflict cases. These discovery disputes can add 3-6 months to the contested timeline.
Proving Adultery in Missouri Courts
Missouri courts require clear and convincing evidence to establish adultery as a factor in contested divorces, maintenance awards, or property dissipation claims. Direct evidence such as a spouse's admission or photographs documenting the affair provides the strongest proof. Circumstantial evidence combining opportunity (the accused spouse had access to the affair partner) and inclination (evidence of romantic interest) may also establish adultery.
Evidence commonly used to prove adultery in Missouri includes:
- Text messages, emails, and social media communications
- Credit card and bank statements showing suspicious expenditures
- Hotel receipts, restaurant charges, and travel records
- Phone records documenting extensive contact with an affair partner
- Photographs or video surveillance footage
- Private investigator reports documenting meetings
- Testimony from witnesses who observed the affair
- DNA evidence in cases involving children born from affairs
Missouri follows the Uniform Dissolution of Marriage Act approach, which deemphasizes fault while still allowing courts to consider misconduct in appropriate circumstances. Courts generally discourage extensive litigation over proving adultery unless the evidence directly relates to dissipation of assets or impact on children.
Filing for Divorce in Missouri: Requirements and Process
Missouri requires that at least one spouse reside in the state for 90 days immediately preceding the filing of the dissolution petition under RSMo § 452.305. Military service members stationed in Missouri satisfy this requirement even without establishing civilian residency. The petitioning spouse may file in the circuit court of any county where either spouse resides.
The Missouri divorce process follows these steps:
- File Petition for Dissolution of Marriage with circuit court clerk ($133-$250 filing fee)
- Serve the petition on the respondent spouse via sheriff or private process server ($25-$100)
- Wait for respondent's Answer (30 days from service)
- Complete mandatory disclosure of assets and debts
- Negotiate settlement or proceed through discovery and trial
- Wait minimum 30 days from filing before finalization
- Attend final hearing for court approval of settlement or ruling after trial
- Receive Judgment of Dissolution signed by the judge
The divorce becomes final when the judge signs the Judgment of Dissolution. Missouri courts retain jurisdiction for 30 days after entry of judgment under Missouri Supreme Court Rule 75.01, allowing parties to file post-trial motions. No waiting period applies to remarriage after the judgment becomes final.
Cost of Adultery Divorce in Missouri
| Cost Category | Uncontested Range | Contested Range |
|---|---|---|
| Filing Fee | $133-$250 | $133-$250 |
| Service of Process | $25-$100 | $25-$100 |
| Attorney Fees | $0-$3,000 | $5,000-$30,000+ |
| Private Investigator | N/A | $1,500-$5,000 |
| Forensic Accountant | N/A | $2,500-$10,000 |
| Expert Witnesses | N/A | $1,000-$5,000 each |
| Mediation | $500-$2,000 | $1,000-$3,000 |
| Court Costs | $100-$300 | $500-$2,000 |
| Total Estimate | $500-$3,500 | $10,000-$50,000+ |
Missouri attorney fees for divorce typically range from $200 to $500 per hour depending on experience and location. St. Louis and Kansas City attorneys generally charge higher rates than rural practitioners. Adultery cases often cost more because proving dissipation requires financial discovery, and emotions run higher leading to more contested hearings.
2026 Missouri Divorce Law Updates
Missouri Governor Mike Kehoe signed House Bill 1908 on April 7, 2026, eliminating the state's prohibition on finalizing divorces while a spouse is pregnant. The legislation passed unanimously with 147-0 in the House and 29-0 in the Senate. Previously, Missouri courts refused to grant final divorce decrees until after the birth of any child, regardless of paternity. The new law allows pregnant spouses to finalize divorce immediately, with paternity determined separately if disputed.
The 2023 amendments establishing presumptive equal parenting time under RSMo § 452.375 remain fully in effect for 2026. Courts now begin custody analysis with the presumption that approximately equal time with both parents serves children's best interests. Either parent may rebut this presumption by presenting evidence that equal time would not serve the child's best interests, but adultery alone typically does not satisfy this standard.
Protecting Yourself During an Adultery Divorce
Missouri spouses considering divorce due to a partner's infidelity should take several protective steps before filing. Gathering evidence of dissipation early prevents the unfaithful spouse from destroying records. Opening individual bank accounts and establishing separate credit protects financial independence. Consulting with an attorney before confronting the unfaithful spouse preserves strategic options.
Strategic considerations for the innocent spouse include:
- Document all marital assets and debts before filing
- Obtain copies of tax returns, bank statements, and financial records
- Screenshot or preserve digital evidence of the affair
- Calculate potential dissipation of marital funds on the affair
- Consider whether adultery evidence strengthens the case enough to justify investigation costs
- Evaluate whether settlement negotiations may resolve issues faster than litigation
- Protect children from exposure to conflict during the divorce process
Frequently Asked Questions
Can I get a divorce in Missouri if my spouse committed adultery?
Missouri grants divorces based on the marriage being irretrievably broken, not adultery specifically. You can obtain a dissolution without proving or even mentioning infidelity. However, if your spouse denies the marriage is broken, you may use adultery evidence under RSMo § 452.320 to prove dissolution is warranted. The 30-day waiting period applies regardless of grounds.
Will my cheating spouse pay more alimony in Missouri?
Missouri courts consider marital conduct including adultery as one of ten factors under RSMo § 452.335 when determining spousal maintenance. Adultery may increase a maintenance award by 5-15% if the affair involved significant misconduct. However, courts will not award punitive alimony solely to punish infidelity. The financially dependent spouse's need remains the primary consideration.
Does adultery affect property division in Missouri?
Missouri's equitable distribution statute RSMo § 452.330 lists conduct during the marriage as a relevant factor. Courts may award a larger property share to the innocent spouse when the unfaithful spouse dissipated marital assets on the affair. Spending $50,000 or more on gifts, travel, and housing for an affair partner typically results in offsetting property credits to the innocent spouse.
Can I lose custody because I had an affair in Missouri?
Missouri custody decisions focus exclusively on children's best interests under RSMo § 452.375, and adultery alone rarely affects custody outcomes. The 2023 presumption of equal parenting time remains in effect for 2026. Courts only consider affairs when the relationship demonstrably harmed the children, such as exposing them to inappropriate situations or neglecting their care.
How long does a divorce take in Missouri if adultery is involved?
Missouri requires a minimum 30-day waiting period after filing before any divorce can be finalized. Uncontested divorces typically conclude in 60-90 days. Contested divorces involving adultery allegations often take 6-18 months due to financial discovery requirements for proving dissipation. Cases proceeding to trial may extend beyond 18 months depending on court scheduling.
Do I need proof of adultery to file for divorce in Missouri?
No proof of adultery is required to file for divorce in Missouri. The state operates under no-fault principles where asserting the marriage is irretrievably broken suffices. Evidence of adultery becomes relevant only if your spouse contests that the marriage is broken, or if you seek to establish dissipation of marital assets affecting property division. Many divorces involving infidelity settle without ever presenting adultery evidence.
Can my spouse's affair partner be sued in Missouri?
Missouri abolished the tort of alienation of affections, meaning you cannot sue your spouse's affair partner for damages related to destroying your marriage. Criminal conversation claims are similarly unavailable. Your legal remedies are limited to divorce proceedings where you may seek appropriate property division and maintenance adjustments based on your spouse's misconduct rather than the affair partner's actions.
What happens if both spouses committed adultery in Missouri?
Missouri's no-fault system means mutual infidelity does not prevent divorce. When both spouses had affairs, courts may find the misconduct offsets for purposes of maintenance and property division. Neither spouse can claim moral high ground, and courts typically focus on financial factors rather than competing misconduct claims. Settlement negotiations often prove more practical than litigating mutual fault.
Does dating during separation count as adultery in Missouri?
Missouri law defines adultery as sexual relations with someone other than your spouse while legally married. Dating or engaging in sexual relationships during separation but before divorce finalization technically constitutes adultery. Courts may consider this conduct when determining maintenance or property division, particularly if marital funds support the new relationship. Waiting until after divorce finalization eliminates this risk.
How do Missouri courts verify claims of adultery?
Missouri courts require clear and convincing evidence to establish adultery as a factor in divorce proceedings. Common evidence includes text messages, financial records, social media communications, witness testimony, and private investigator reports. Courts evaluate credibility of all evidence presented. Circumstantial evidence showing opportunity and inclination may establish adultery without direct proof of sexual relations.
Author: Antonio G. Jimenez, Esq. | Florida Bar No. 21022 | Covering Missouri divorce law
Filing fees verified as of April 2026. Verify current fees with your local circuit court clerk before filing.
This guide provides general information about Missouri adultery divorce law and does not constitute legal advice. Consult with a licensed Missouri attorney for advice specific to your situation.