
Common-law marriage is a type of marriage that is formed without a license or a wedding ceremony. Montana is one of the minority of states that recognize common-law marriage. To prove a common-law marriage in Montana, the couple must prove to the district court that they are competent to enter into a marriage, that they assumed a marital relationship by mutual consent and agreement, and that they confirmed their marriage by cohabitation and public repute. This means that the couple must present themselves as a married couple to the community at large. If a common-law marriage is proven, the couple will have to go through a regular divorce if they wish to separate, and the surviving spouse will have the same rights of inheritance as any other spouse.
| Characteristics | Values |
|---|---|
| Legal Recognition | Common-law marriage is legally recognized in Montana. |
| Marriage License | Common-law marriage does not require a marriage license. |
| Solemnization | Common-law marriage does not require solemnization (a wedding ceremony). |
| Competency | Both parties must be competent to enter into a marriage, meeting age, mental capacity, and relationship requirements. |
| Mutual Consent | Both parties must express their intent to be married and agree to be spouses. |
| Cohabitation | Living together is considered but is not the sole determining factor. |
| Public Repute | The couple must present themselves as married openly and acquire a reputation, character, and status of marriage in public. |
| Declaration of Marriage | A written declaration by a Montana-licensed attorney, attested by two witnesses and acknowledged by an authorized official, can support a common-law marriage claim. |
| Dissolution | Common-law marriage is a real marriage, requiring a legal dissolution with asset division, debt division, and alimony determination. |
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What You'll Learn

Proving competency to enter into a marriage
In the state of Montana, proving a common-law marriage can be a complex process, especially when it comes to establishing competency to enter into a marriage. Here is a guide to help you understand the key factors and requirements:
Montana does recognize common-law marriages as legally valid, but proving the existence of such a union can be challenging. One of the fundamental aspects of any marriage, including common-law marriages, is the competency of the parties involved. Both individuals must possess the necessary mental capacity to understand the nature and effects of the marriage contract. This includes the ability to make sound judgments and have a rational understanding of the marriage decision.
To prove competency, you may need to provide evidence that demonstrates your mental capacity at the time of entering into the common-law marriage. This can include medical records, psychological evaluations, or testimony from healthcare professionals who can attest to your cognitive abilities. It is important to note that the standard for competency is based on your understanding and appreciation of the marriage contract, not your intellectual capacity in general.
Another factor that may impact competency is impairment due to substances or mental health issues. If there are concerns about impairment, you may need to present evidence that refutes these claims. For example, you could provide testimony from witnesses who can attest to your sobriety or mental stability during the relevant period. Additionally, any documentation or professional assessments that address your capacity during that time can be helpful.
In some cases, the court may appoint a guardian ad litem or conduct a separate hearing to specifically determine the issue of competency. This process ensures that both parties fully understand the legal implications of their union and are capable of making informed decisions. It is important to seek legal advice and be prepared to provide comprehensive evidence to support your claim of competency if it is ever called into question.
While proving competency might seem straightforward, it can become complicated, especially in common-law marriage cases. It is always advisable to consult with an experienced family law attorney who can guide you through the specific requirements and help you gather the necessary evidence to prove your competency to enter into a marriage. They can also assist in navigating any unique circumstances or challenges that may arise during the process.
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Mutual consent and agreement
Montana is one of the minority of states that recognize common-law marriages. This means that two partners can form a legal marriage without a solemnization (wedding ceremony) or a marriage license.
For a common-law marriage to be valid in Montana, the couple must prove that they are competent to enter into a marriage. This means that they are old enough to marry, they are not already married or closely related, and they are not suffering from a serious mental illness or under the influence of drugs or alcohol.
In addition, the couple must prove that they assumed a marital relationship by mutual consent and agreement. This means that they expressed their intent to be married and communicated this desire to each other. The mutual consent of the parties can be expressed privately or publicly and does not need to be in any particular form; it can be implied from the conduct of the parties.
For example, a couple may express their mutual consent by referring to each other as husband and wife, both to each other and to the public. They may also exchange rings, take their partner's last name, or file joint tax returns. However, maintaining separate bank accounts, different last names, or separate financial accounts do not necessarily indicate a lack of mutual consent.
It is important to note that a common-law marriage cannot be kept a secret from the community. The couple must present themselves as a married couple to the community at large and act as if they were a married couple rather than just a pair.
To protect yourself and your spouse in the event of separation or death, especially if there are assets involved, it is recommended to hire a family law attorney to draft a Declaration of Marriage to support the common-law marriage. This declaration must be drafted by a licensed Montana attorney and attested by at least two witnesses and an official authorized to administer oaths in Montana.
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Cohabitation and public repute
In Montana, common-law marriage is recognised as a real marriage, and it requires a legal dissolution of marriage to terminate the relationship. The state's Supreme Court has established three elements for creating a common-law marriage, which the party asserting its existence must prove to the district court.
The third element, cohabitation and public repute, is the one that cases in Montana have mainly been concerned with. While cohabitation is one issue the court will consider, it is not the only determining factor. There is no specific length of time for cohabitation that automatically creates a common-law marriage in Montana.
To determine whether a couple has held themselves out to the public as married, the Montana Supreme Court considers a number of actions, including but not limited to:
- Exchanging rings
- Taking the partner's last name
- Filing joint tax returns
- Referring to one another as husband and wife or as spouses—to themselves, friends, and the community
- Filling out any type of documents or forms with a signature line indicating "spouse"
However, keeping different last names or maintaining separate financial accounts does not prove that a common-law marriage does not exist.
The court looks at all the facts presented and the various competing public policies of the State of Montana. Two competent individuals could live together their whole adult lives and never form a common-law marriage if they never said or acted as a married couple to the community at large.
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Declaration of Marriage
In the state of Montana, a Declaration of Marriage may be handwritten or typed. It must be one-sided, on 8 1/2 x 11 paper and include the following information for both the bride and groom:
- The date the parties are declaring they were married (this may be a date in the past but cannot be a date in the future)
- A statement that both parties are legally competent to enter into the marriage contract
- Signature lines for the bride, groom, and two witnesses (not to be signed until instructed by the Clerk)
Both parties must appear in person to sign and file the declaration of marriage, and proof of age, such as a driver's license or passport, is required. The cost for issuing a marriage license is $53.00, payable by cash, money order, Visa, MasterCard, or Discover. If paying by credit or debit card, a 1.995% plus a $1.25 processing fee will be added to the transaction.
In Montana, common-law marriages are recognised, meaning a marriage formed without a license and solemnisation. The Montana Supreme Court has set out the elements for creating a valid common-law marriage:
- The parties must be competent to enter into a marriage
- The parties entered into the marital arrangement by mutual consent and agreement
- The parties confirmed their marriage by cohabitation and public repute
The competency requirements for a common-law marriage are the same as those in a traditional marriage. The parties cannot be related, they cannot already be married, and they must have the mental capacity to enter into a marital relationship. Mutual consent and agreement mean that the two people form the present intent to be married and express it to one another. This can be done privately or in front of witnesses.
The final part of the test, cohabitation and public repute, is the main concern of the Court. There is no specific length of time for cohabitation, and keeping different last names or maintaining separate financial accounts does not matter. A common-law marriage will not be found if it was kept secret from the community.
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Divorce and separation
In Montana, common-law marriage is not recognized, but if you have established a common-law marriage in another state, it may be valid in Montana. If you are seeking a divorce or separation from a common-law marriage, here are some important things to know:
Proving a Common-Law Marriage:
Since Montana doesn't recognize common-law marriages contracted within its borders, you must provide proof that your common-law marriage was valid in the state where it was established. This typically involves demonstrating that:
- You and your partner agreed to be married (this can be verbal or written, but must be mutually understood and communicated)
- You lived together in a marital relationship (this includes cohabitation and holding yourselves out as a married couple to the public)
- You consider yourselves married, and your actions demonstrate this belief
It's important to gather as much evidence as possible to support your claim, including documents and testimony from witnesses who can attest to your relationship and mutual understanding of being married.
Once you've established that your common-law marriage is valid, the divorce or separation process is similar to that of a traditional marriage. Here are the steps to follow:
- File a petition for divorce or legal separation: One spouse must file a petition with the district court in the county where either spouse resides. The petition should include information about the marriage, grounds for divorce or separation, and any requests regarding property division, spousal support, child custody, and child support.
- Serve the other spouse: The petitioner must ensure that the other spouse is served with a copy of the divorce petition and a summons. This can be done by a sheriff, process server, or certified mail with return receipt requested.
- Response and negotiation: The responding spouse has a certain number of days to file a response to the petition. This is also an opportunity for both spouses to try to negotiate the terms of their divorce or separation agreement, including property division, spousal support, and child custody arrangements. Mediation may be suggested by the court as a way to resolve disputes.
- Discovery and disclosure: Both spouses will be required to provide financial disclosures and may engage in the discovery process, which involves exchanging relevant information and documents. This helps to ensure that both parties have a clear picture of the marital assets, incomes, and other relevant details.
- Trial: If the spouses cannot reach an agreement through negotiation or mediation, the case may proceed to trial, where a judge will make decisions regarding the division of assets, spousal support, child custody, and anything else that hasn't been agreed upon.
- Finalizing the divorce: Once all issues are resolved through agreement or trial, the court will issue a Final Decree of Dissolution of Marriage, which officially ends the marriage.
It's important to note that the specific procedures and requirements may vary depending on the county in Montana where you file for divorce or separation. Consulting with a local family law attorney can provide you with personalized guidance and ensure that you navigate the process effectively.
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Frequently asked questions
A common-law marriage in Montana is a marriage formed without a license or solemnization (wedding ceremony). It is a real marriage that requires a legal dissolution to terminate the relationship.
To prove a common-law marriage in Montana, the parties involved must prove the following to the district court:
- They were competent to enter into a marriage (both people were old enough to marry, neither is already married or closely related, and both have the mental capacity to enter into a marital relationship)
- They assumed a marital relationship by mutual consent and agreement (both people expressed their intent to be married and expressed this desire to each other)
- They confirmed their marriage by cohabitation and public repute (they presented themselves as a married couple to the community at large)
Proving a common-law marriage in Montana entitles individuals to parental rights and/or a portion of the marital estate upon separation or death. For example, in the event of their spouse's death, the surviving common-law spouse has the same rights of inheritance as any other spouse.







































