Missouri does not permit couples to establish common law marriages within state borders under RSMo § 451.040, which declares all marriages without a license "null and void." However, Missouri courts will recognize and dissolve common law marriages validly formed in states like Kansas, Colorado, Iowa, Texas, Montana, Oklahoma, or the District of Columbia under the Full Faith and Credit Clause of the U.S. Constitution. If you entered a common law marriage in another state and now reside in Missouri, you must obtain a formal divorce through Missouri circuit courts to legally end that marriage. Filing fees range from $133 to $250 depending on your county, and at least one spouse must have resided in Missouri for 90 consecutive days before filing under RSMo § 452.305.
Key Facts: Common Law Marriage Divorce in Missouri
| Requirement | Details |
|---|---|
| Filing Fee | $133 to $250 (varies by county; as of January 2026) |
| Residency Requirement | 90 days minimum for at least one spouse |
| Waiting Period | 30 days after filing before finalization |
| Grounds for Divorce | No-fault: "irretrievable breakdown" |
| Property Division | Equitable distribution (fair, not necessarily equal) |
| Common Law Marriage Formed In-State | Not recognized; declared void under RSMo § 451.040 |
| Out-of-State Common Law Marriage | Recognized if valid where formed |
Understanding Common Law Marriage Recognition in Missouri
Missouri categorically prohibits the formation of common law marriages within state boundaries under RSMo § 451.040, which mandates that all marriages require a valid license obtained before solemnization. The statute explicitly states that "no marriage contracted shall be recognized as valid unless the license has been previously obtained." This prohibition has been Missouri law for over a century, meaning couples who cohabit in Missouri for any length of time, even decades, do not acquire marital rights through cohabitation alone. However, Missouri follows constitutional principles requiring recognition of marriages validly formed in other jurisdictions.
The Full Faith and Credit Clause of the U.S. Constitution obligates Missouri to honor common law marriages established in states that permit them. As of 2026, seven states plus the District of Columbia still allow common law marriage formation: Colorado, Iowa, Kansas, Montana, Oklahoma, Texas, and the District of Columbia. If you established a common law marriage in any of these jurisdictions before relocating to Missouri, your marriage carries the same legal weight as a ceremonial marriage. This means you have identical rights to property division, spousal maintenance, and child custody determinations as couples who obtained marriage licenses.
The practical implication for couples seeking divorce is significant. If you believe you have a common law marriage from another state, you cannot simply separate and consider yourselves unmarried. Missouri courts require formal dissolution proceedings identical to those for licensed marriages. Without a divorce decree, you remain legally married, which affects your ability to remarry, your tax filing status, your inheritance rights, and your exposure to debts incurred by your spouse.
Proving a Common Law Marriage for Missouri Divorce Purposes
Missouri courts require substantial evidence that a valid common law marriage existed under the laws of the state where it was allegedly formed. The burden of proof falls on the party asserting the marriage exists. For example, Kansas requires proof of three elements: capacity to marry (both parties over 18 and not already married), present intent and agreement to be married, and public presentation as a married couple. Colorado similarly requires mutual consent, cohabitation, and public reputation as married. Each state has slightly different requirements, and Missouri courts will apply the law of the state where the marriage allegedly formed.
Evidence commonly used to prove common law marriage includes joint federal and state tax returns filed as "married filing jointly," joint bank accounts and credit cards, property deeds listing both parties as spouses, health insurance or employment benefits listing one party as a spouse, sworn affidavits from the Attorney General of Kansas (if applicable), testimony from family and friends about the couple holding themselves out as married, shared last names, and documents such as leases, mortgages, or contracts identifying the parties as husband and wife. The absence of cohabitation evidence can be problematic, though Kansas law notably does not require cohabitation as an element.
Missouri courts have consistently applied the principle that if the originating state would have recognized the marriage, Missouri will too. In contested cases where one party denies the marriage existed, the court will conduct an evidentiary hearing examining all available documentation and witness testimony. Preparing comprehensive evidence before filing is essential because a failure to prove the marriage means the court lacks jurisdiction to divide property as marital assets or award spousal maintenance.
Filing Requirements for Common Law Marriage Divorce in Missouri
Dissolution of a common law marriage in Missouri follows the identical procedural requirements as any other divorce under Missouri Revised Statutes Chapter 452. At least one spouse must have been a Missouri resident for a minimum of 90 consecutive days immediately preceding the filing of the petition, as mandated by RSMo § 452.305(1). Only one spouse needs to meet this residency threshold. The petition should be filed in the circuit court of the county where either spouse resides.
Missouri is a no-fault divorce state, meaning the only ground required is that the marriage is "irretrievably broken" with no reasonable likelihood of reconciliation under RSMo § 452.320. Neither spouse needs to prove wrongdoing such as adultery, abandonment, or cruelty. This no-fault standard applies equally to common law marriages recognized from other states. After filing, Missouri imposes a mandatory 30-day waiting period before the court may enter a final judgment of dissolution, giving couples an opportunity for reflection or reconciliation.
Filing fees vary significantly across Missouri's 45 judicial circuits. As of January 2026, fees range from approximately $133 in some circuits to $250 in others. Jefferson County charges $131 for divorces without children and $231 for divorces involving minor children. Jackson County charges $177.50, while St. Charles County charges $225. Additional costs include service of process fees ($25 to $75 for sheriff service or $10 to $50 for certified mail) and certified copy fees ($2 to $5 per page). Couples with minor children must complete an approved parenting education class costing $25 to $75.
Property Division in Common Law Marriage Divorce
Missouri applies equitable distribution principles to divide marital property in common law marriage divorces under RSMo § 452.330. "Equitable" means fair under the circumstances, not necessarily equal. Courts may award 60/40, 70/30, or other unequal splits depending on factors such as each spouse's earning capacity, contributions to the marriage (including homemaking), economic circumstances, and conduct during the marriage. This differs from the nine community property states that mandate 50/50 division.
The court first classifies all assets and debts as either marital or separate property. Marital property includes all assets acquired by either spouse during the marriage, regardless of title, except property received as gifts, inheritances, or bequests to one spouse individually. Separate property remains with the original owner and is not subject to division. The date the common law marriage began becomes critical because it determines when the acquisition of marital property started. Without a marriage certificate, courts examine evidence such as when the couple began holding themselves out as married, when they filed joint tax returns, or when they acquired joint property.
Missouri notably does not penalize spouses who commingle separate property with marital assets. Unlike many states where mixing funds converts separate property to marital property, Missouri law presumes the separate property retains its nonmarital character unless the owning spouse specifically intended to convert it. This can benefit spouses who owned significant assets before the common law marriage began. However, if marital labor or funds contributed to increasing the value of separate property, that appreciation may be considered marital property subject to division.
Spousal Maintenance (Alimony) Considerations
Missouri courts may award spousal maintenance in common law marriage divorces under RSMo § 452.335 using the same standards applied to ceremonial marriages. To qualify, the requesting spouse must demonstrate they lack sufficient property to provide for their reasonable needs and cannot support themselves through appropriate employment. Courts exercise broad discretion because Missouri law provides no formula or calculator for determining maintenance amounts or duration, unlike child support which follows specific guidelines.
Once eligibility is established, judges evaluate ten statutory factors to set maintenance amounts and duration. These include the financial resources of each party, time needed for the requesting spouse to acquire education or training for employment, the standard of living established during the marriage, the marriage duration, the 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 the parties during the marriage (which may include financial misconduct such as dissipating assets).
Missouri courts award three types of spousal maintenance. Temporary maintenance (pendente lite) provides support during the dissolution proceedings until the final order. Rehabilitative maintenance supports a spouse while they acquire education or job training to become self-sufficient, typically lasting 2 to 5 years depending on the degree or certification sought. Long-term modifiable maintenance is reserved for spouses who cannot achieve financial independence due to age, health conditions, or disability, often after marriages lasting 15 or more years. Maintenance orders may be modified upon proof of a substantial and continuing change in circumstances unless the decree specifically states the maintenance is non-modifiable.
Child Custody and Support in Common Law Marriage Divorce
Child custody and support determinations in common law marriage divorces follow identical standards as any other Missouri divorce. Courts apply the "best interests of the child" standard under RSMo § 452.375, considering factors such as each parent's wishes, the child's wishes (if of sufficient age), the child's relationship with each parent, adjustment to home, school, and community, and each parent's willingness to facilitate a relationship between the child and the other parent. Missouri law presumes that frequent, continuing, and meaningful contact with both parents serves children's best interests.
Missouri uses Schedule of Basic Child Support Obligations (Form 14) to calculate child support, considering both parents' gross incomes, the number of children, work-related childcare costs, health insurance premiums, and extraordinary expenses. As of 2026, the guidelines apply to combined adjusted gross incomes up to $30,000 per month. Parents must also complete an approved parenting education program such as Focus on Kids, costing $25 to $75 per parent. Courts require a detailed parenting plan addressing legal custody (decision-making authority), physical custody (residential schedule), holiday schedules, transportation arrangements, and communication methods.
Common Law Divorce Process Timeline in Missouri
The timeline for dissolving a common law marriage in Missouri depends heavily on whether the case is contested or uncontested. An uncontested divorce where both spouses agree on all terms can be finalized in approximately 60 to 90 days. This includes the mandatory 30-day waiting period after filing, time for service of process (7 to 14 days typically), and scheduling of the final hearing (2 to 4 weeks after the waiting period expires). Some Missouri circuits offer simplified procedures for uncontested cases with no minor children and limited assets.
| Divorce Type | Typical Timeline | Key Factors |
|---|---|---|
| Uncontested (no children) | 60-90 days | Agreement on all issues, waiver of service |
| Uncontested (with children) | 90-120 days | Parenting plan approval, parenting class completion |
| Contested (moderate complexity) | 6-12 months | Discovery, mediation, settlement negotiations |
| Contested (high conflict) | 12-24 months | Custody evaluation, trial, appeals possible |
Contested divorces involving disputes over property division, maintenance, or custody take substantially longer. Discovery processes including interrogatories, requests for production, and depositions typically require 3 to 6 months. Missouri courts often require mediation before trial, adding another 1 to 3 months. If the case proceeds to trial, scheduling can add 3 to 6 months depending on court congestion in your circuit. Complex asset valuation, business ownership disputes, or contested custody cases frequently extend timelines to 18 to 24 months from filing to final judgment.
States That Recognize Common Law Marriage
Understanding which states recognize common law marriage helps determine whether your relationship may qualify for divorce proceedings in Missouri. As of 2026, seven states plus the District of Columbia permit new common law marriages to be formed.
| Jurisdiction | Current Status | Key Requirements |
|---|---|---|
| Colorado | Recognizes | Mutual consent, cohabitation, reputation as married |
| Iowa | Recognizes | Intent/agreement, continuous cohabitation, public declaration |
| Kansas | Recognizes | Capacity, present agreement, holding out (no cohabitation required) |
| Montana | Recognizes | Capacity, mutual consent, cohabitation, public acknowledgment |
| Oklahoma | Recognizes | Capacity, mutual agreement, cohabitation (case law requirements) |
| Texas | Recognizes | Agreement, cohabitation, representation to others |
| District of Columbia | Recognizes | Intent, cohabitation, holding out |
| Rhode Island | Limited | Recognized only through case law, not statute |
| Utah | Limited | Court or administrative order required |
Several states formerly recognized common law marriage but have since abolished it. Alabama prohibited new common law marriages after January 1, 2017. South Carolina abolished common law marriage effective July 24, 2019, following the state Supreme Court decision in Stone v. Thompson. Georgia prohibited new common law marriages after January 1, 1997. Pennsylvania eliminated common law marriage after January 1, 2005. Florida prohibited common law marriage after January 1, 1968. These states continue to recognize common law marriages that were validly formed before their respective cut-off dates.
Fee Waivers for Low-Income Petitioners
Missouri courts offer fee waivers for petitioners who cannot afford filing costs. To request a waiver, file a "Motion and Affidavit in Support of Request to Proceed as a Poor Person" along with your petition. Judges typically grant waivers if your household income falls below 125% of the federal poverty line. For 2026, this threshold is approximately $19,506 for a single-person household or $40,150 for a family of four. You must provide documentation of your income, assets, and expenses.
The fee waiver covers the initial filing fee but may not cover all associated costs such as service of process fees or certified copies. Some circuits require petitioners to demonstrate they attempted to obtain legal aid assistance before granting waivers. Missouri Legal Services, Legal Aid of Western Missouri, and Legal Services of Eastern Missouri provide free legal assistance to qualifying low-income residents and can help with fee waiver applications as well as representation in uncontested divorce proceedings.
Common Mistakes to Avoid
Parties dissolving common law marriages frequently make errors that complicate or delay their cases. The most common mistake is assuming the marriage does not exist simply because it was never ceremonially solemnized. If you meet the requirements of a state that recognizes common law marriage and spent time living there as a couple holding yourselves out as married, you may be legally married regardless of your beliefs. Separating without obtaining a divorce can create significant problems when either party attempts to remarry, file taxes, claim benefits, or handle estate matters.
Another frequent error is failing to gather sufficient evidence of the common law marriage before filing. Because Missouri does not create these marriages, courts need proof the marriage was valid where formed. Incomplete documentation can result in dismissal or a ruling that no marriage existed, which eliminates access to marital property division and spousal maintenance. Similarly, parties sometimes disagree about when the common law marriage began, affecting what constitutes marital versus separate property. Establishing a clear timeline with documentary evidence is essential.
Finally, parties often underestimate the complexity of property division when assets were accumulated over years without formal marriage documentation. Without wedding dates or marriage certificates, tracing the acquisition dates of property and determining marital versus separate character requires careful financial analysis. Consulting with a Missouri family law attorney experienced in common law marriage cases before filing can help avoid costly mistakes and ensure your rights are protected throughout the dissolution process.