Connecticut cohabitation laws give unmarried couples who live together almost no automatic legal rights. There is no common-law marriage, no domestic partnership registry, and no civil union that creates spousal protections through cohabitation alone. Length of the relationship does not matter. To protect each other’s property, medical care, and inheritance, you have to put the paperwork in place yourselves.
No Common-Law Marriage in Connecticut
Connecticut does not recognize common-law marriage. Living together for twenty years, sharing bank accounts, and raising children together does not turn you into spouses under state law. For property division, inheritance, and spousal protections, you and your partner remain legal strangers.
That default cuts in one direction: the state won’t treat you as married when you’d want it to, but it also won’t impose marriage-like obligations you didn’t agree to. Everything sits on the contracts and legal documents you create.
One Place Cohabitation Does Matter: Existing Alimony
If you or your partner already receive alimony from a prior marriage, moving in together can put that money at risk. Under Connecticut General Statutes Section 46b-86, a paying ex-spouse can ask the court to reduce or end alimony if the recipient is living with a new partner and the arrangement has lowered their financial need. Courts look at shared expenses, pooled finances, and how much the relationship functions like a marriage.1Justia. Connecticut General Statutes 46b-86 – Modification of Alimony or Support Orders The upshot: cohabitation offers no legal benefit to the couple, but it can trigger a real financial cost if one partner is receiving support from a former spouse.
Cohabitation Agreements
A cohabitation agreement is the single most useful document an unmarried couple in Connecticut can sign. It works like a prenup, but for partners who aren’t planning to marry. A solid agreement addresses who owns what, how the two of you handle shared expenses, and how property gets divided if you split up.
Connecticut courts enforce these agreements as ordinary contracts. Both partners must enter voluntarily, both must disclose their finances, and the terms cannot be the product of fraud or coercion. Grossly one-sided terms can be refused enforcement. Public policy is not a barrier to enforcing property arrangements between unmarried cohabitants in Connecticut.2Connecticut Judicial Branch. Cohabitation Agreements – Law Library Pathfinder
Courts will also recognize implied contracts based on how a couple actually behaved, even without anything in writing. The problem is proof. Verbal promises are hard to demonstrate, and judges are cautious about reading obligations into intimate relationships. A written agreement removes the guesswork. Each partner should have their own attorney review it before signing.
Property Rights If You Split Up
When a married couple divorces, a Connecticut court divides their property under equitable distribution rules. Unmarried couples get none of that. Property disputes between former partners go through contract and property law, without the family court safety net.
The easiest case is joint ownership. If both names are on a deed or title, Connecticut law presumes co-owners hold equal shares unless the document says otherwise or one party proves a different arrangement.3Justia. Connecticut General Statutes 47-14a – Form of Conveyance The harder case is property titled to one partner alone. Paying part of the mortgage, funding the down payment, or covering renovations on a home your partner owns solo does not automatically give you any ownership interest.
Constructive Trust Claims
When one partner would be unjustly enriched by keeping property the other partner helped pay for, Connecticut courts can impose what’s called a constructive trust. This is not something you set up in advance. It’s an after-the-fact remedy a judge can order when title is held by someone who, in fairness, should not be permitted to retain it.4Connecticut General Assembly. Constructive Trust – Research Report
Winning that kind of claim takes evidence. Canceled checks, bank transfer records, and written communications about the property all help. Courts consider both direct payments toward the property and indirect contributions, like paying household bills so the other partner could afford the mortgage.
Partition of Jointly Owned Property
If you co-own real estate with your ex-partner and can’t agree on what to do with it, either of you can file a partition action. Connecticut law lets any co-owner ask the court to divide jointly held property. In practice, the court usually orders the property sold and the proceeds split.5Connecticut General Assembly. Chapter 919 – Partition or Sale of Real or Personal Property
If one of you contributed more, that partner can argue for a larger share of the proceeds, but only with documentation. A forced court sale rarely brings what a negotiated private sale would, so reaching agreement outside court tends to leave both people better off financially.
Custody and Parentage for Unmarried Parents
Connecticut uses the same custody framework for unmarried parents that it applies to divorcing spouses. Courts decide legal custody, meaning who makes major decisions about education, healthcare, and religion, and physical custody, meaning where the child lives, based on the child’s best interests.6Justia. Connecticut General Statutes 46b-56 – Orders Re Custody, Care, Education, Visitation and Support of Children
The catch for unmarried fathers is standing. Before you can seek custody or visitation, you have to be a legal parent. Years of caretaking do not substitute for legal parentage. The simplest fix is the Acknowledgment of Parentage form both parents can sign at the hospital when the child is born, which establishes the legal parent-child relationship without a court proceeding.7Justia. Connecticut General Statutes 46b-477 – Execution of Acknowledgment of Parentage
If parentage is disputed or the form wasn’t signed, you can petition the court for genetic testing. Under the state’s parentage statutes, a court must order testing when a party submits a sworn statement alleging a reasonable possibility of genetic parentage.8Connecticut General Assembly. Connecticut Parentage Act – Section 46b-497, Authority to Order or Deny Genetic Testing Once parentage is confirmed, both parents have equal standing. Neither is automatically favored, and joint custody is not presumed.
Domestic Violence Protections Do Reach Cohabitants
Connecticut’s family violence law defines “family or household member” to include anyone currently residing together or who has resided together, regardless of blood or marriage, along with people in dating relationships and partners who share a child.9Connecticut General Assembly. Chapter 815e – Section 46b-38a, Family Violence Prevention and Response Definitions A cohabiting partner has the same access to restraining orders, victim services, and criminal protections as a married spouse. Protective orders can require the abusive partner to leave the shared home, stay away from you and your children, and surrender firearms. Not being married doesn’t shrink your options here.
Medical Decisions and Hospital Access
If your partner is unconscious in a hospital, Connecticut law does not put you in charge. It defaults to family members in a set order, and an unmarried partner isn’t on that list. The way around this is paperwork you sign while you’re both healthy.
Healthcare Representative and Advance Directive
Any Connecticut adult can appoint a healthcare representative to make medical decisions when they cannot communicate. The appointment must be signed and dated in front of two adult witnesses, who also sign.10Justia. Connecticut General Statutes 19a-576 – Appointment of Health Care Representative Name each other. Without this, doctors will look to your partner’s parents, siblings, or adult children instead of you.
An advance directive, sometimes called a living will, is separate. It records your preferences for end-of-life care so your representative has both authority and guidance.
Visitation and Medical Records
Federal rules protect your right to visit. At Medicare- and Medicaid-participating facilities, patients can designate any visitor they choose, including a domestic partner, and hospitals can’t restrict visitation based on the relationship.11U.S. Department of Health & Human Services. FAQs on Patient Visitation at Certain Federally Funded Entities and Facilities
Medical records are handled separately, through HIPAA. A provider can share health information with anyone the patient authorizes in writing. Your partner can sign a HIPAA authorization identifying you by name and directing providers to share records with you.12U.S. Department of Health & Human Services. Under HIPAA, When Can a Family Member Access an Individual’s PHI Keep the signed form somewhere you can grab it in an emergency.
Inheritance and Estate Planning
This is where the gap between married and unmarried couples hits hardest. Die without a will in Connecticut, and the intestacy statute distributes your property to a surviving spouse, children, and parents. An unmarried partner receives nothing.13Justia. Connecticut General Statutes 45a-437 – Intestate Succession, Distribution to Spouse If your partner owns the home you share and dies with no estate plan, that home passes to their relatives, and you can lose your housing.
A Will Is the Baseline
Every cohabiting couple in Connecticut needs a will. To be valid, the will must be in writing, signed by the person making it, and witnessed by at least two people who sign in the testator’s presence.14Connecticut General Assembly. Chapter 802a – Section 45a-251, Making and Execution of Wills A will lets you leave property to your partner, name them as executor, and choose guardians for your children.
Wills have limits. Property passing through a will goes through probate, which takes time and is public. Family members who feel entitled to the estate can contest, and contests come more often when the beneficiary isn’t a spouse or blood relative.
Beneficiary Designations and Joint Ownership
Some of your most valuable assets never touch a will. Life insurance, retirement accounts, and payable-on-death bank accounts pass directly to whoever is listed as beneficiary. If your partner’s 401(k) still names an ex-spouse, the ex-spouse gets it, regardless of what the will says. Updating beneficiary forms is often more important than the will itself.
Joint ownership with rights of survivorship transfers property outside probate as well. If you own a home together as joint tenants, your partner’s share passes automatically to you at death. A revocable living trust can do the same job for a broader range of assets and keeps everything out of probate.
Taxes and Federal Benefits
Unmarried partners cannot file joint federal tax returns, and several other tax and benefit rules treat you as unrelated individuals.
Gift Tax on Large Transfers
Spouses can transfer unlimited amounts to each other free of federal gift tax. Unmarried partners cannot. In 2026, you can give your partner up to $19,000 per year without filing a gift tax return; anything above counts against your lifetime gift and estate tax exemption.15Internal Revenue Service. What’s New – Estate and Gift Tax The issue comes up when one partner helps the other buy a home, pay off debt, or handle a large expense.
Employer Health Coverage
Some employers cover domestic partners, but the tax treatment differs from spousal coverage. When your employer pays for your unmarried partner’s health insurance, the fair market value of that coverage counts as taxable income to you unless your partner qualifies as your tax dependent. That extra income shows up on your W-2 and gets hit with income and payroll taxes. Your share of the premium for your partner’s coverage has to be paid on an after-tax basis, unlike spousal premiums, which come out pre-tax. To qualify as your dependent, your partner generally must live with you the entire year, receive more than half their support from you, and meet citizenship or residency requirements. For most dual-income couples, domestic partner coverage ends up costing more after taxes than equivalent spousal coverage would.
No Social Security Survivor Benefits
Social Security survivor benefits are limited to surviving spouses (including ex-spouses married for at least ten years), children, and dependent parents.16Social Security Administration. Who Can Get Survivor Benefits If your partner dies, you get none of their Social Security, no matter how long you were together. That makes life insurance and retirement savings more important as replacement income.
Debt You Share and Debt You Don’t
Living together doesn’t make you responsible for your partner’s individual debts. Credit cards in their name alone, their student loans, their medical bills: creditors cannot come after you. Federal debt collection law does not treat a cohabiting partner the way it treats a spouse.
The exception is debt you both signed for. On a joint credit card, both account holders are responsible for the full balance, even if only one person made the charges.17Consumer Financial Protection Bureau. Am I Responsible for Charges on a Joint Credit Card Account if I Didn’t Make Them Same for a joint mortgage or a co-signed car loan. Being an authorized user on someone else’s card is different: authorized users can charge, but the primary account holder owes the balance.
If you’re separating, agree in writing on who pays which joint debts and close shared accounts. Creditors are not bound by your private deal. If your ex agreed to pay the joint card and doesn’t, the creditor can still collect from you.
When the Relationship Ends
There is no unmarried divorce in Connecticut. You don’t file anything with the court to end a cohabiting relationship. But when you can’t agree on the split, you end up in court anyway, often through a messier process than divorce because the default rules aren’t there.
A cohabitation agreement controls if you have one. Without one, you’re arguing equitable theories: constructive trust, unjust enrichment, implied contract. Each requires you to prove what the arrangement was, which is difficult when nothing was written down and your ex tells a different version.
Custody and support run through family court either way. Once parentage is established, the same best-interests standard applies, and both parents owe the child financial support.6Justia. Connecticut General Statutes 46b-56 – Orders Re Custody, Care, Education, Visitation and Support of Children
The pattern is the same across every part of Connecticut cohabitation law. Protections don’t attach automatically. A cohabitation agreement, current beneficiary designations, a will, and a healthcare representative form are inexpensive to put in place. Going without them is a bet that nothing will go wrong.