Idaho abolished common law marriage effective January 1, 1996, so you cannot create one today by living together, no matter how long the relationship lasts. Two categories still count as valid, though: a common law marriage formed inside Idaho before that 1996 cutoff, and one validly formed in another state that still allows them. If your relationship fits either category, Idaho treats it as a full marriage for property division, inheritance, spousal support, and divorce.
What Idaho Requires for a Marriage Today
Idaho Code 32-201 sets two requirements for any marriage formed after January 1, 1996: a marriage license and solemnization by someone authorized under Idaho law. Living together and calling each other spouses is not enough. The statute states directly that a “marriage created by a mutual assumption of marital rights, duties or obligations shall not be recognized as a lawful marriage.”1Idaho State Legislature. Idaho Code Section 32-201 – What Constitutes Marriage, No Common-Law Marriage After January 1, 1996
Idaho also does not recognize domestic partnerships or civil unions. There is no middle-ground legal status for cohabiting couples in Idaho’s domestic relations code, which means couples outside the two recognized common law categories have essentially no marital rights under state law.2Social Security Administration. POMS PR 05005.015 – Idaho
Common Law Marriages Formed in Idaho Before 1996
The same statute that abolished common law marriage grandfathers in any that was “in effect prior to January 1, 1996.”1Idaho State Legislature. Idaho Code Section 32-201 – What Constitutes Marriage, No Common-Law Marriage After January 1, 1996 To qualify, both partners had to agree to be married, live together, and hold themselves out as a married couple before that date. Meet all three, and Idaho courts treat the marriage as fully valid.
Proving a decades-old informal marriage is the hard part. In the 2015 Idaho Court of Appeals case Gunderson v. Golden, a couple who lived together from 1987 to 2012 could not produce enough evidence that their common law marriage existed before the 1996 cutoff. The court dismissed the petition, ruling that Idaho’s abolition of common law marriage “commands our courts to refrain from enforcing contracts in contravention of clearly declared public policy and from legally recognizing co-habitational relationships in general.”2Social Security Administration. POMS PR 05005.015 – Idaho The partner seeking property division received nothing under Idaho divorce law.
If you believe a pre-1996 Idaho common law marriage applies to you, assemble the documentation now. Joint tax returns from the early 1990s, insurance beneficiary designations naming each other as spouses, and sworn statements from relatives who knew you as a married couple during that period are all useful.
Out-of-State Common Law Marriages Idaho Will Honor
Under the Full Faith and Credit Clause, Idaho must recognize a common law marriage that was validly formed in another state.3Legal Information Institute. Common Law Marriage The word carrying the weight is “validly.” Idaho courts apply the law of the state where the marriage was formed and require the couple to have met every element of that state’s requirements.
Only a handful of states still allow new common law marriages to form. Those jurisdictions include Colorado, Iowa, Kansas, Montana, New Hampshire (for inheritance purposes only), Oklahoma (where statutes and case law may conflict), Rhode Island (through case law), Texas, Utah, and the District of Columbia.4National Conference of State Legislatures. Common Law Marriage by State Alabama, Georgia, Ohio, and Pennsylvania recognize marriages formed before specific cutoff dates but no longer allow new ones.
Requirements vary, but most states share three core elements: a present agreement to be married, cohabitation, and holding yourselves out as a married couple. Texas adds that both partners must have been at least 18 and neither already married to someone else at the time.5Texas State Law Library. Common Law Marriage If you formed a common law marriage in Texas and later moved to Idaho, showing the marriage is valid means proving you met each Texas element, not just that you lived together a long time.
Property Rights in a Recognized Common Law Marriage
Idaho is a community property state. Under Idaho Code 32-906, almost everything either spouse acquires during the marriage is community property, including income, rental profits, and investment gains. Property you owned before the marriage, or received as a gift or inheritance during it, stays separate.6Idaho State Legislature. Idaho Code Section 32-906 – Community Property Defined
When a recognized common law marriage ends in divorce, Idaho Code 32-712 requires the court to divide community property with a strong presumption toward a substantially equal split in value. The court weighs debts alongside assets and can deviate from a 50/50 division only when there are “compelling reasons.”7Idaho State Legislature. Idaho Code Section 32-712 – Community Property and Homestead, Disposition That is a narrower framework than the “equitable distribution” approach used in most other states, where judges have broader discretion to divide by fairness rather than equality.
Couples in a recognized common law marriage who accumulated property across two states can hit tangles. Assets acquired while living in Idaho generally follow community property rules; assets acquired in the originating state may follow that state’s rules. Sorting the characterization before a dispute arises is worth the effort.
Inheritance Rights
If your common law spouse dies without a will, your share depends on which other relatives survive. Under Idaho Code 15-2-102, a surviving spouse inherits the entire estate if no children or parents survive. If the deceased spouse left surviving children, the surviving spouse receives half the separate property, and the deceased’s half of community property passes to the surviving spouse automatically.8Justia. Idaho Code Section 15-2-102 – Share of the Spouse
Inheritance is often when the marriage itself gets challenged. Children from a prior relationship, for example, may have a financial reason to argue the marriage never existed. If the surviving partner cannot prove the marriage met the originating state’s requirements, or predated Idaho’s 1996 cutoff, spousal inheritance rights can disappear. A will and coordinated estate planning documents remove that risk entirely.
Spousal Maintenance
Idaho courts can award maintenance when a recognized common law marriage ends. Under Idaho Code 32-705, the court sets amount and duration based on factors including the requesting spouse’s financial resources, the length of the marriage, age and health, and the other spouse’s ability to pay while meeting their own needs.9Idaho State Legislature. Idaho Code Section 32-705 – Maintenance Fault can matter too: adultery, extreme cruelty, and other marital misconduct can influence both whether maintenance is awarded and how much. Length of marriage often carries substantial weight.
Ending a Recognized Common Law Marriage
A recognized common law marriage does not dissolve because the couple stops living together. The only way to end it is a formal divorce. Idaho recognizes eight grounds for divorce, from irreconcilable differences (no-fault) to fault-based grounds including adultery, extreme cruelty, willful desertion, willful neglect, habitual intemperance, and felony conviction.10Idaho State Legislature. Idaho Code Section 32-603 – Causes for Divorce The process is the same as dissolving a ceremonial marriage, with community property, maintenance, and any child issues addressed in the proceeding.
Couples in common law marriages sometimes assume separation ended things. It didn’t. If you never filed for divorce, you are still legally married, and that status affects your ability to remarry, your tax filing options, and your obligations for a spouse’s debts or medical decisions.
How to Prove a Common Law Marriage
The burden falls on the person claiming the marriage exists, and Idaho courts examine the evidence closely. For an out-of-state marriage, you show that every element of the originating state’s law was satisfied. For a pre-1996 Idaho marriage, you show that all traditional elements were met before January 1, 1996.
Evidence that typically helps includes:
- Federal tax returns filed as “married filing jointly,” which show both intent and public representation.
- Joint bank accounts, mortgages held in both names, and insurance policies naming each other as beneficiaries.
- Sworn statements from blood relatives or close acquaintances who observed the couple living as spouses.
- Mail, identification, or professional records showing a shared surname.
- Lease agreements, school enrollment forms, or club memberships listing both partners as a married couple.
The Social Security Administration follows its own evidence hierarchy for common law marriages. Under 20 CFR 404.726, the SSA prefers signed statements from both spouses (or from the surviving spouse) plus statements from two blood relatives of the deceased, each explaining why the signer believes the marriage existed. If blood relatives are unavailable, statements from other people who knew the couple can substitute.11Social Security Administration. 20 CFR 404.726 – Evidence of Common-Law Marriage
Federal Taxes and Social Security
The IRS recognizes a common law marriage that was valid where it was formed. Under Revenue Ruling 58-66, reaffirmed in Revenue Ruling 2013-17, a couple in a valid common law marriage can file joint federal returns even after moving to a state like Idaho that no longer permits new common law marriages.12Internal Revenue Service. Revenue Ruling 2013-17 Joint filing can matter for tax brackets and for credits and deductions that phase out at different thresholds for married and single filers.
Social Security spousal and survivor benefits are also available. The SSA applies the law of the state where the couple lived at the time the worker filed for benefits, or at the time of death for survivor claims. If that state recognizes the marriage, the SSA treats the claimant as a spouse. Survivor benefits can be a large share of retirement income, so assembling documentation before it is needed pays off.
If You Don’t Have a Recognized Marriage
Idaho courts have flatly refused to apply divorce-law property division to unmarried cohabiting couples, however long the relationship. The Gunderson ruling makes clear that time together creates no property rights on its own. A few legal tools can fill some of the gap:
- An advance care planning document under Idaho Code 39-4510 lets you name your partner as your healthcare agent to make medical decisions if you become incapacitated. The form includes HIPAA authorization so your agent can access your records.13Idaho State Bar. Idaho Advance Care Planning Document
- A will or living trust is the only way to give your partner anything at death, because Idaho intestacy law gives an unmarried partner nothing.
- A written agreement covering how jointly purchased property will be divided if the relationship ends offers some protection, though Idaho courts’ reluctance to enforce contracts that resemble marital property division means these agreements should be drafted carefully.
- Naming your partner as beneficiary on retirement accounts, life insurance, and payable-on-death bank accounts passes those assets directly, outside probate and intestacy.
These do not replace the full bundle of marital rights, but together they cover the sharpest edges: the hospital that turns your partner away, the retirement account that defaults to a parent or sibling, and the house you helped pay for but have no legal claim to.