
Common-law marriage in Montana is recognised as a legal union between two people without a marriage license or solemnization. The four conditions required to validate a common-law marriage are: competency to enter into marriage, mutual consent and agreement, cohabitation, and public repute as a married couple. This type of marriage grants the same rights and responsibilities as a traditional marriage, including inheritance rights for the surviving spouse. However, proving a common-law marriage can be challenging, especially if one spouse is unavailable to testify. Couples can complete an Affidavit of Common Law Marriage form to establish proof of their union.
| Characteristics | Values |
|---|---|
| Recognition | Common-law marriage is recognized in Montana. |
| Definition | A marriage formed without a license and solemnization. |
| Requirements | The parties must be competent to enter into a marriage, enter into a mutual agreement, and confirm their marriage by cohabitation and public repute. |
| Proof | Couples can complete the Affidavit of Common Law Marriage form from the Montana State Law Library, which can be used as proof of marriage when applying for benefits. |
| Inheritance Rights | The surviving spouse has the same inheritance rights under the Montana Uniform Probate Code (UPC) as any other surviving spouse or beneficiary, but the amount received depends on the length of the marriage and other factors. |
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What You'll Learn

Common law marriage definition
In Montana, a common-law marriage is a marriage formed without a license and solemnization. It is recognized by the state as a real marriage, requiring a legal dissolution.
To establish a valid common-law marriage in Montana, four conditions must be met and proven. Firstly, the parties must be competent to enter into a marriage. This includes being of age, not already married, and not related to one another within a certain degree. Both parties must also have the mental capacity and not be under the influence of an incapacitating substance. Secondly, there must be a mutual arrangement and agreement, meaning that both parties form the present intent to be married and express it to one another. This expression can be made privately or in front of witnesses. Thirdly, the couple must confirm their marriage by cohabitation and public repute. They must present themselves as a married couple, acting as a unit, and referring to each other as husband and wife. This is an important factor that the courts consider when determining the validity of a common-law marriage. Lastly, the marriage must not be kept secret from the community.
A couple seeking to demonstrate a common-law marriage can complete the Affidavit of Common Law Marriage form from the Montana State Law Library. This form, once signed and sworn before a notary public, serves as proof of marriage and can be used for various legal purposes, such as applying for Social Security benefits or estate planning.
The surviving spouse of a common-law marriage in Montana has the same inheritance rights as any other surviving spouse under the Montana Uniform Probate Code (UPC). However, the amount they receive depends on factors such as the length of the marriage, how the property is titled, and whether there are beneficiary designations or a will in place.
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Rights of inheritance
In Montana, a common-law marriage is broadly defined as a marriage formed without a license. Common-law marriages are legally recognised in the state, and carry the same rights and responsibilities as a solemnised marriage.
The surviving spouse of a common-law marriage has the same rights of inheritance under the Montana Uniform Probate Code (UPC) as any other surviving spouse or beneficiary. However, the amount they inherit depends on several factors:
- How the property is titled: Whose name appears on the real property, checking and savings accounts, stocks, bonds, and mutual funds? Is the property solely owned, or jointly owned with right of survivorship? If the property is held in joint tenancy with right of survivorship between the couple, the property passes automatically to the survivor, regardless of whether they can prove a common-law marriage.
- Presence of a beneficiary designation: Did the deceased designate who would receive the asset upon their death?
- Length of the marriage: The percentage of the augmented estate that the surviving spouse is entitled to increases the longer the marriage. If the couple has been married for 15 or more years, the surviving spouse is entitled to 50% of the marital portion of the augmented assets. The percentage varies depending on how long the court decides they were in a common-law marriage.
- Family situation: Whether the decedent (the person who died) has surviving parents or lineal descendants (children, grandchildren or great-grandchildren).
It is important to note that proving a common-law marriage can be difficult, especially if your spouse is not available to testify to the existence of the marriage. Couples wanting to demonstrate a marital relationship could complete the Affidavit of Common Law Marriage form from the Montana State Law Library, which can be used as proof of marriage when applying for Social Security benefits or for a surviving spouse applying for appointment as a personal representative for the deceased's estate.
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Proving a common-law marriage
In Montana, common-law marriage is recognised under MCA § 40-1-403, and is broadly defined as a marriage formed without a license. However, proving a common-law marriage can be difficult, especially if your spouse is not available to testify to the existence of the marriage. Even if it can be proven, it may come at a great financial and emotional expense.
If you need to prove a common-law marriage, it is important to understand the requirements. The party asserting the existence of a common-law marriage must prove three elements to the district court:
- The parties were competent to enter a marriage: The competency requirements for a common-law marriage are the same as those in a traditional marriage. The parties must be at least 18 years old, not already married, and cannot be related. They must also have the mental capacity to enter a marital relationship and not be under the influence of an incapacitating substance.
- The parties assumed a marital relationship by mutual consent and agreement: This means that the two people expressed their intent to be married to one another. The mutual consent of the parties does not need to be expressed in any specific form and can be implied from their conduct. The agreement may occur privately without anyone else present, or it may be witnessed by others.
- The parties confirmed their marriage by cohabitation and public repute: The court will consider all the facts presented, including witness statements and exhibits. Living together is one issue the court will look at, but it alone is not the determining factor. The couple must present themselves as husband and wife openly to the community.
It is important to note that there is no specific length of time required for cohabitation, and maintaining separate or joint financial accounts may not matter. Additionally, keeping different last names is not proof positive one way or the other. The belief that living together for a certain number of years automatically creates a common-law marriage is incorrect.
To protect yourself and your rights in a common-law marriage, consider hiring a family law attorney to draft a Declaration of Marriage. This can provide proof of your marriage and make transactions of adult life easier.
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Affidavit of Common Law Marriage form
In the state of Montana, a common-law marriage is formed without a license and solemnization. To create a valid common-law marriage, the Montana Supreme Court has outlined the following requirements:
- The parties must be competent to enter into a marriage (of age, not already married, not related, and with sound mental capacity).
- The parties must enter into the marital arrangement by mutual consent and agreement, forming the present intent to be married and expressing it to one another. This agreement may be made privately or in the presence of witnesses.
- The parties must confirm their marriage by cohabitation and public repute, presenting themselves openly as a married couple to the community.
To officially document a common-law marriage in Montana, couples can complete the Affidavit of Common Law Marriage form from the Montana State Law Library. This form, signed by the couple and notarized, serves as proof of their marriage and carries the same rights and responsibilities as a solemnized marriage. It can be used in various situations where proof of marriage is required, such as applying for Social Security benefits or estate planning.
The Affidavit of Common Law Marriage form is a legal declaration that allows a couple to affirm their common-law marriage status. By signing the form, the couple attests to meeting the requirements of a common-law marriage, including competency, mutual consent, and public recognition of their marital union. This document is then presented to a notary public, who officiates the affidavit, adding credibility and authenticity to the couple's statement.
While the Affidavit of Common Law Marriage form serves as proof, couples can also choose to make a Declaration of Marriage without Solemnization (as per MCA 40-1-311). This declaration, filed with the Clerk of the District Court, further solidifies the legality of the common-law marriage and can simplify certain adult life transactions. However, it's important to note that this declaration is not mandatory for a valid common-law marriage.
In the context of estate planning, the surviving spouse of a common-law marriage in Montana has the same inheritance rights as any other surviving spouse under the Montana Uniform Probate Code (UPC). The length of the marriage, as determined by the court, can impact the inheritance share, with longer marriages resulting in a higher percentage of the augmented estate passing to the surviving spouse.
It is always advisable to consult with an attorney or legal professional when navigating matters of marriage, estate planning, and the completion of legal forms to ensure that one's rights and interests are fully protected.
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Dissolution of a common-law marriage
A common-law marriage in Montana is a real marriage and requires a legal Dissolution of Marriage (commonly referred to as a divorce) to terminate the relationship. The State Law Library provides the appropriate forms for ending a marriage in Montana. An attorney could also be consulted to assure the legal rights of each party are protected.
To file for divorce in Montana, you or your spouse must file a petition stating that your marriage is "irretrievably broken", meaning there is no reasonable potential for reconciliation. The judge will decide that a marriage is irretrievably broken if the couple has lived separately for more than 180 days before filing for divorce or if there is serious marital disagreement or discord that negatively affects the attitude of either spouse towards the marriage. If both spouses agree about the breakdown of the marriage, the judge will consider evidence of these factors. If the spouses disagree, the judge will also take this into account when deciding whether the marriage is irretrievably broken.
There is a 21-day waiting period before a judge may issue a final divorce decree. The waiting period starts on the date when the "respondent" (non-filing) spouse received the divorce papers. If the spouses disagree about the breakdown of the marriage, the judge may continue the case for 30-60 days and suggest that the couple go to counselling.
Upon separation or dissolution of a common-law marriage, the rights and duties of the parents towards their children must be set out in a Parenting Plan. The State Law Library of Montana provides the appropriate forms for developing a Parenting Plan.
In Montana, each spouse's separate property is subject to "equitable division", meaning a judge decides how the property should be divided. Alimony, or spousal support, may also be awarded as part of a divorce.
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Frequently asked questions
A common-law marriage in Montana is a marriage formed without a license and solemnization.
The requirements for a common-law marriage in Montana are that the parties must be competent to enter into a marriage, there must be an assumption of a marital relationship by mutual consent and agreement, and they must acquire the reputation, character, and status of marriage in public.
You can prove a common-law marriage in Montana by completing the Affidavit of Common Law Marriage form from the Montana State Law Library. This form is signed by the couple and sworn before a notary public for the State of Montana.
A common-law marriage in Montana carries the same rights and responsibilities as a solemnized marriage. This includes the right of inheritance under the Montana Uniform Probate Code (UPC) as any other surviving spouse.
Yes, same-sex marriage is recognized in Montana, and therefore same-sex couples can enter into a common-law marriage.







































