Not Married? Then Legally, Your Partner Is a Stranger.

You share a bed, a mortgage, a dog, a Costco membership, and a decade.

The law shares none of it. If you die tonight without documents, in most states your partner has the legal standing of a polite acquaintance. This is not an edge case. Tens of millions of American adults live with a partner they aren’t married to, and the legal system was built for exactly none of them.

Here is everything that goes wrong by default, and the paperwork that fixes each one.

Intestate succession, the state formula that distributes property when there’s no will, recognizes spouses and relatives. An unmarried partner appears nowhere in the statute. Not after five years, not after thirty.

Your share of everything titled in your name goes to your legal next of kin. Your parents. Your siblings. The estranged brother. Your partner watches it happen with no standing to stop it.

A quick word on common law marriage, because someone always brings it up: fewer than a dozen states still allow new common law marriages, Colorado and Texas among them, and the bar is higher than “we lived together a long time.” You generally have to agree you’re married and hold yourselves out as married. If that’s not you, it’s not protecting you.

If the home is titled in your name alone, it passes to your heirs, not your partner. Which means the surviving partner can be a guest in their own house, at the mercy of your relatives, who now own it and may want to sell it.

If you both own it, the deed’s exact wording decides everything. Joint tenancy with right of survivorship passes your share to your partner automatically. Tenancy in common sends your share through probate to your heirs, making your grieving partner co-owners with your family. Most people have no idea which words are on their deed. Go read yours this week.

If you’re unconscious with no healthcare proxy, most states hand medical decisions to a statutory list of surrogates. That list typically starts with spouse, then adult children, then parents, then siblings. A number of states have added domestic partners somewhere in the hierarchy. Many have not, and even where partners appear, they can rank below family or invite disputes.

Federal rules require hospitals to let you designate your visitors, so a partner generally can’t be barred from the room the way they routinely were a generation ago. But visiting is not deciding. The person choosing whether you stay on the ventilator can be a parent who met your partner twice.

Disposition of remains, meaning burial, cremation, the service, all of it, defaults to legal next of kin in essentially every state. Your partner can be overruled on every choice, handed a schedule for a funeral they didn’t plan, in a church you left at nineteen.

Most states let you appoint a designated agent for disposition, a short signed form that puts your partner in charge of exactly this. Almost nobody knows the form exists.

Marriage carries survivor benefits that no document can replicate, and honesty requires saying so plainly.

Social Security survivor benefits go to spouses, qualifying ex-spouses, and dependents. An unmarried partner gets nothing, full stop, no matter what your will says. Employer pensions with survivor annuities, the estate tax marital deduction, spousal rules on inherited IRAs: all married-only. If those numbers are large in your life, that’s a real financial argument to weigh, coldly and on purpose, about legal marriage. Not romance. Math.

Everything else is fixable with paperwork. This is the complete set:

A will. Names your partner as beneficiary and executor. The foundation. Without it, every default above fires.

Beneficiary designations. Life insurance, 401(k), IRA, and POD/TOD registrations on bank and brokerage accounts pass outside the will, fast, no probate. For unmarried couples these are the workhorses. Audit them annually.

Healthcare proxy plus HIPAA release. Puts your partner first in line for medical decisions and information. Part of a standard advance directive.

Durable financial power of attorney. Lets your partner handle money if you’re incapacitated. Remember, it ends at your death, which is what the will and beneficiary forms are for.

Designated agent for disposition. The funeral-control form. Small document, enormous consequence.

Deed review. Confirm survivorship language, or use a transfer on death deed where your state allows it, so the house moves without probate.

Life insurance. The blunt instrument for replacing the survivor benefits marriage would have provided.

A cohabitation agreement. The unglamorous contract that says whose money is whose. Matters most when one partner’s family is likely to fight.

An estate attorney can do the whole stack in one engagement. For unmarried couples this isn’t optional polish. It’s the entire legal existence of your relationship.

Marriage is a bundle of about a thousand legal defaults. Skip the marriage and you skip the defaults, which means every protection your partner has is one you built by hand. The law will not assume your love. It only reads your documents. Write them.

Sources: State intestate succession statutes; state healthcare surrogate consent statutes; state disposition-of-remains and designated agent statutes; 42 CFR §482.13 (hospital visitation rights); Social Security Administration survivor benefit rules. See our Sources & Methodology.

This article is education, not legal advice. Laws vary significantly by state. For your situation, talk to an estate planning attorney. Here’s when you need one and what they cost.