Litigating Common-Law Marriage Claims in Montana Probate Court

Losing a partner is incredibly difficult, and the stress is compounded when surviving relatives refuse to recognize your relationship. In Montana, common-law marriage is a legally valid union, meaning couples do not need a marriage license or a formal ceremony to be considered married. However, when one partner dies, proving that this legal relationship existed is entirely up to the surviving partner. If you successfully prove your status, you generally have the right to claim the surviving spouse's elective share of the estate, preventing you from being disinherited.

The Core Elements of Common-Law Marriage in Montana

Whether you are in Billings, Missoula, or Helena, the legal standard for proving a common-law marriage remains the same statewide. According to Mont. Code Ann. § 40-1-403, a valid common-law marriage requires that both parties were competent to marry, mutually consented and agreed to the marriage, and cohabited while holding themselves out to the public as married. The burden of proof rests heavily on the person claiming the marriage existed, as demonstrated in the landmark precedent In re Estate of Hunsaker, 291 Mont. 412 (MT Supreme Court 1998).

Proving Mutual Consent Post-Death

Proving mutual consent after one partner has passed away is notoriously challenging because one half of the couple can no longer testify. Courts look for circumstantial evidence to establish that both people considered themselves married. This can include naming each other as spouses on insurance policies, filing joint tax returns, or wearing wedding rings. Affidavits and testimonies from friends, family, and coworkers who understood you were husband and wife are critical in building your case in front of a judge.

Disputes Over Shared Bank Accounts

Financial co-mingling is one of the strongest indicators of a common-law marriage. If you and your deceased partner shared bank accounts, paid utility bills together, or held joint leases, this serves as powerful evidence of your mutual commitment. However, biological heirs often argue that joint accounts were merely a matter of convenience rather than proof of marriage. To combat this, you must show that the funds were used for shared marital expenses and that both parties presented themselves as a married unit to financial institutions.

Defending Against a Fake Common-Law Marriage Claim by a Roommate

On the flip side, rightful heirs sometimes face fraudulent claims from a deceased loved one's roommate or casual girlfriend/boyfriend. Because common-law marriage allows a surviving partner to take a massive share of the estate under Mont. Code Ann. § 72-2-232, fake claims are not uncommon. If you are defending an estate, your goal is to show the court that the three core elements were not met. For example, you might present separate tax returns, separate bank accounts, and testimonies from people who knew the deceased consistently referred to the claimant as just a friend or roommate.

Step-by-Step Process for Litigating a Claim in Montana

Proving or defending against a common-law marriage claim involves a formal legal process within the state's probate court system.

Step 1: File a Formal Petition

The surviving partner must file a formal petition demanding recognition as a surviving spouse. This is typically filed in the District Court where the deceased resided. For example, you might file in the Yellowstone County District Court, Billings, the Missoula County District Court, Missoula, or the First Judicial District Court, Helena. You generally file a petition for formal adjudication of intestacy and determination of heirs under Mont. Code Ann. § 72-3-301.

Step 2: Discovery and Gathering Evidence

Both sides will enter the discovery phase. This is where lawyers collect text messages, emails, financial records, and sworn depositions from witnesses. This step is critical for building a timeline of the relationship and establishing public repute.

Step 3: Evidentiary Hearing

Because these cases are highly fact-specific, the judge will hold an evidentiary hearing. Witnesses will take the stand, and attorneys will present financial records and documents. The judge will then issue a ruling on whether a valid common-law marriage existed at the time of death.

How Much Does it Cost in Montana?

Litigating a common-law marriage claim in probate court is essentially a full-blown lawsuit, and the costs reflect that complexity.

How Long Does the Process Take?

A contested common-law marriage claim in Montana rarely resolves quickly. If the case goes all the way to an evidentiary hearing or trial, the process generally takes anywhere from 8 to 18 months. The initial probate opening takes a few weeks, but the discovery phase-where both sides gather bank records and interview witnesses-can drag on for over half a year.