If you live together, share finances, and present yourselves as a couple, a court in certain states may already consider you legally married — whether or not you ever signed a license or said vows. Understanding how a common-law marriage prenup works, and why timing is everything, can mean the difference between protecting what you've built and losing it to a divorce proceeding you never saw coming.
What Common-Law Marriage Actually Means
The phrase "common-law marriage" gets thrown around loosely — people use it to mean any long-term relationship, whether or not the law agrees. The legal definition is much narrower.
Common-law marriage is a legally recognized union, formed without a license or ceremony, that typically requires three elements: mutual agreement to be married, cohabitation, and presenting as a married couple to the outside world. It is not simply a matter of living together for a set number of years — that "seven-year rule" is a persistent myth with no basis in any state's actual statutes.
Critically, a common-law marriage cannot be ended by separation alone; it requires a legal divorce. That single fact carries enormous financial consequences. The moment a court recognizes your relationship as a common-law marriage, the full machinery of divorce law — property division, spousal support, debt allocation — applies to its dissolution.
Which States Recognize Common-Law Marriage — and Which Have Abolished It
Common-law marriage is not uniformly acknowledged across the United States, and the list of recognizing states has been shrinking for decades. Several states have abolished it for new marriages while continuing to honor unions formed before the abolition date: Georgia ended recognition in 1997, Pennsylvania in 2005, and Alabama in 2017. Couples who formed a valid common-law marriage before those cutoff dates may still hold legally recognized marital status in those states.
As of 2024, common-law marriage is generally recognized for new relationships in Colorado, Iowa, Kansas, Montana, Rhode Island, Oklahoma, Texas, and the District of Columbia. Oklahoma's status carries an important caveat: courts have issued conflicting rulings in recent years, and there is ongoing legislative pressure to abolish the practice. Couples relying on Oklahoma recognition should verify current case law with a local attorney rather than treating it as settled.
Two additional states — Utah and South Carolina — recognize common-law marriage for limited domestic purposes. New Hampshire's recognition is narrower and categorically different: under RSA 457:39, New Hampshire recognizes cohabitation as a marriage-equivalent only for inheritance purposes after the death of one partner. It does not recognize common-law marriage as a general ongoing legal status the way Texas or Colorado do, and lumping it with Utah and South Carolina misrepresents the practical scope of its law.
Texas takes a distinctive approach, calling it an "informal marriage" and providing two routes to establish one: the couple can file a signed declaration of informal marriage with the county clerk, or they can prove an agreement to be married, cohabitation in Texas as spouses, and representation to others in Texas that they are married. Texas also has a unique protection: if the couple separates and neither files a proceeding to prove the marriage within two years of separation, there is a rebuttable presumption that the parties never agreed to be married.
It is worth noting that Texas is also a community property state — meaning marital assets are generally split 50/50 rather than under an equitable distribution standard. This matters because several of the states that still recognize common-law marriage use community property rules, not just the equitable distribution framework that applies in most U.S. states. The two systems produce meaningfully different outcomes at dissolution.
The Full-Faith-and-Credit Wrinkle
Even if you live in a state that does not recognize common-law marriage, your relationship history in another state can follow you. If you formed a valid common-law marriage while living in Texas and then moved to California, California courts will generally treat you as legally married. This cross-border effect catches many couples completely off guard — particularly those who relocate for work. If you've moved states recently, it's worth reading What Happens to a Prenup If You Move to Another State? alongside this article.
Common-Law Marriage and Same-Sex Couples
Before Obergefell v. Hodges (2015), several states that recognized common-law marriage limited it explicitly to opposite-sex couples. After Obergefell, same-sex couples gained equal access to both ceremonial and common-law marriage in recognizing states. However, the transition created genuine legal complexity: courts in some states have had to determine whether same-sex couples who cohabited and held themselves out as spouses before 2015 can establish a common-law marriage retroactively. The answer varies by jurisdiction and the specific facts involved. Same-sex couples with long pre-2015 relationships in common-law states should seek legal advice about whether their relationship history creates any recognized marital status.
How Courts Determine When a Common-Law Marriage Began
This is arguably the most practically important question for asset protection, yet it is rarely addressed directly. The start date of a common-law marriage determines which assets fall into the marital estate — and courts do not simply use the date a couple moved in together.
Courts look at a constellation of evidence to identify when all three elements (agreement, cohabitation, and holding out) were simultaneously present. That evidence typically includes: how the couple introduced each other to friends, family, and colleagues; whether they filed joint tax returns; whether they listed each other as spouses or beneficiaries on insurance policies, retirement accounts, or emergency contacts; shared lease or mortgage agreements; social media and correspondence; and testimony from people who knew them. A couple who began cohabiting in 2015 but only started introducing each other as spouses in 2019 may find a court placing the marriage start date at 2019 — or somewhere in between, depending on the weight of the evidence.
This ambiguity is precisely why a written agreement executed early in a relationship is so valuable. It creates a contemporaneous record of the parties' actual intentions at a specific point in time.
How Property Gets Divided in a Common-Law Marriage Divorce
Once a court recognizes a common-law marriage, the property division rules are identical to those that apply to ceremonially married couples. States use one of two frameworks: equitable distribution, where a judge divides marital property based on fairness under the specific facts of the case (not necessarily 50/50), or community property rules, where marital assets are generally split equally. As noted above, Texas — one of the most significant common-law marriage states — uses community property, so the "vast majority use equitable distribution" framing does not apply uniformly across recognizing states.
Marital property is all property acquired by spouses during their marriage, regardless of whose name is on the title. A bank account titled solely in your name, a car you bought with your own paycheck, a brokerage account you funded entirely yourself — all of it can be characterized as marital property if it was acquired after the date the court determines your common-law marriage began. In most states, if property acquired before the marriage has risen in value due to the efforts of either or both spouses, the actively appreciated portion may also be treated as marital property.
The Commingling Trap
One of the most dangerous mistakes long-term couples make is commingling separate and marital assets. When separate property is deposited into a joint account, used to fund a shared purchase, or otherwise mixed with marital funds, it may lose its distinct status and become subject to division. For couples who have been together for years before formalizing anything, commingling is almost inevitable — rent paid from a shared account, a down payment drawn from mixed funds, business profits deposited alongside personal savings. See Do Prenups Cover Joint Bank Accounts? for a deeper look at how a written agreement can address this.
The Specific Asset-Protection Traps Common-Law Couples Face
Retirement accounts. The marital estate includes retirement accounts funded with earnings during the marriage, regardless of whose name is on the account. For a common-law couple, the relevant start date is whatever date a court determines the marriage was formed — which can reach back years earlier than the couple expected.
Business interests. If you started or grew a business during the period a court later characterizes as your common-law marriage, your partner may have a claim to a share of that business even without direct involvement. Future and contingent expectancies created during the marriage — including equity that vests after separation, deferred compensation, and royalties — can also be drawn into the marital estate.
Real estate. Property purchased in one partner's name alone is not automatically separate property if it was acquired during the marriage. Courts examine the source of funds, mortgage contributions, and how the couple treated the property in practice. Will a Prenup Protect Future Real Estate Investments? walks through the specific clauses that matter.
Debt. In many states, debts incurred during a marriage — including a common-law one — can become the responsibility of both spouses. If your partner accumulated significant credit card debt or student loans during the relationship, you could find yourself liable at dissolution.
What a Prenup Can Do — and the Limits of Each Tool
Prenuptial Agreements
A prenuptial agreement is a written contract executed before marriage that defines property rights, debt allocation, and financial expectations in the event the marriage ends. For common-law couples, the phrase "before the marriage occurs" creates a practical problem: if a court later determines your common-law marriage began years ago, a prenup signed today may not govern the period that has already passed.
One critical enforceability factor that is frequently overlooked: courts regularly void prenups where one party lacked independent legal counsel. When both partners share the same attorney, or when one partner signs without any legal advice, courts in many states treat that as evidence of overreaching or insufficient understanding — and the agreement fails. Each party should retain separate, independent counsel before signing.
Postnuptial Agreements
It is important to note that prenuptial agreements are not the only option once a relationship is underway. Postnuptial agreements — executed after a marriage has already been formed — are valid in most states and can address many of the same issues a prenup would cover. For couples who are already in a relationship that may qualify as a common-law marriage, a postnuptial agreement may be the more directly applicable instrument. Requirements and enforceability standards vary by state, so legal advice is essential.
Cohabitation Agreements
A cohabitation agreement, executed as early in the relationship as possible, addresses property rights, debt allocation, and financial expectations during the unmarried phase. It can also include an explicit statement that the parties do not intend to be married — which is relevant evidence if a common-law marriage claim is later asserted.
However, a cohabitation agreement is not a guaranteed shield. Courts in Texas and Colorado have found valid common-law marriages to exist even where the parties had written agreements stating they did not intend to be married. The agreement is one piece of evidence, not a conclusive defense. Its weight depends on the totality of how the couple actually conducted their relationship. If the written agreement says "we are not married" but the couple filed joint tax returns, listed each other as spouses on insurance, and introduced each other as husband and wife, a court may give the written agreement little weight.
If the couple later formalizes the relationship with a ceremony and license, a cohabitation agreement does not automatically carry forward — a separate prenuptial agreement should be executed before the wedding date.
Spousal Support
Courts in common-law marriage states have the same authority to award alimony as in ceremonial marriages. A prenup or cohabitation agreement can set parameters for spousal support or waive it entirely, but state law limits apply. Most states prohibit provisions that would leave a spouse dependent on public assistance, and courts can void support waivers they find unconscionable — particularly where there is a significant disparity in earning capacity or where one partner sacrificed career advancement for the relationship. Understanding what your state will and will not enforce requires advice from a local attorney.
What a Common-Law Marriage Prenup Should Actually Cover
Whether you are signing a cohabitation agreement, a prenup before a formal ceremony, or a postnuptial agreement, the following provisions are especially important for couples in common-law states:
- A clear statement of intent. Explicitly state whether you intend to be married. This is not conclusive, but it is contemporaneous evidence a court can weigh.
- Separate property schedules. Attach a detailed list of each partner's assets and debts as of the signing date to create a baseline that makes commingling arguments harder to sustain.
- Commingling rules. Specify how shared expenses will be handled and whether contributing to a jointly used asset changes its character.
- Business and equity interests. Address what happens to a business, stock options, or other equity if the relationship ends. See Prenups and Stock Options: Protecting Equity Before Marriage for clause-level detail.
- Debt allocation. Specify which debts belong to which partner and confirm that neither party is responsible for the other's individually incurred obligations.
- Spousal support terms. Set parameters for support, with the understanding that provisions that are unconscionable or that would require public assistance may not be enforced.
- Independent counsel confirmation. Each party should acknowledge in the agreement that they had the opportunity to consult independent legal counsel before signing.
For a full overview of what these agreements can and cannot include, The Most Common Prenup Clauses Explained is a useful companion read.
Timing Matters More Than You Think
The longer you wait to document your intentions, the harder it becomes to draw a clean line between separate and marital property. Courts look for evidence that both parties had adequate time to review the agreement, seek independent counsel, and sign without pressure — and the further removed the signing is from the start of the relationship, the more years of accumulated assets and conduct are already in the record without any written framework governing them.
For common-law couples, the urgency is compounded because the "marriage" may have already started, at least in a court's eventual estimation. Waiting until a formal wedding is planned may mean that years of contributions, commingled funds, and relationship conduct have already shaped what a court will treat as the marital estate.
This article is for general information only and is not legal advice. Consult a qualified attorney in your jurisdiction.