Will vs. Living Trust for Unmarried Couples: Which One Do You Actually Need?

What happens if you do nothing

Start with the part nobody enjoys picturing. You and your partner have been together for years, you share a home, maybe a dog, maybe kids. One of you dies suddenly with no will and no trust. Who gets the house, the car, the savings?

Not your partner. Every state has an intestate succession statute that decides this for you when there's no estate plan, and those statutes route everything to your closest blood relatives in a fixed order. California is typical: under Probate Code section 6402, when there's no surviving spouse the estate passes to your children, then your parents, then your siblings, then more distant kin. An unmarried partner appears nowhere in that list. The law has no slot for the person you actually built a life with.

The word "spouse" is doing all the work. The roughly 18 states that follow the Uniform Probate Code define a "surviving spouse" as a married person, and no one else. So a married widow can inherit by default with no paperwork at all. Your partner of fifteen years inherits the same way a roommate would, which is to say not at all, unless you put it in writing.

Will or trust: which one do you need?

Here's the honest answer the generic explainers skip: for most unmarried couples it isn't a choice between a will and a living trust. You want both, working together. The will alone leaves your partner in probate. The trust alone can't name a guardian for your kids. Run yourself through the questions below.

How a will and a living trust actually differ

A will is a set of instructions that only takes effect when you die, and it usually runs through probate, the court process that validates the will and supervises the handoff. Probate is public record, it can take many months, and it costs money. A will is also the only document that can name a guardian for your minor children. A trust cannot do that.

A revocable living trust is a container you create while you're alive and move your assets into ("funding" it). You stay in full control as trustee. Because the trust, not you personally, owns those assets, they don't go through probate when you die. They pass straight to whomever you named, privately. And because you name a successor trustee, the trust keeps running if you become incapacitated, so someone you trust manages things without a court guardianship. "Revocable" means you can change or cancel it any time, which matters: it keeps your options open, and it has tax consequences we'll get to.

Why two separate trusts, not one joint trust

This is the single most important thing a relationship-agnostic guide will not tell you. Married couples often share one joint living trust, and it works fine for them because of marriage-only tax rules. For an unmarried couple, a joint trust is the wrong tool. Use two separate revocable trusts, one each.

The headaches with a joint trust are practical before they're ever about tax. Whose Social Security number is the trust's taxpayer ID? Whose assets are whose when you've funded it unevenly? What happens to commingled property if you break up, which unmarried couples do far more often than the law assumes? Two separate trusts keep each person's property cleanly theirs, make the breakup case clean, and remove the guesswork.

Now the tax nuance, stated carefully because this is where bad advice circulates. You may have read that funding a joint trust unequally is automatically a taxable gift to the other partner. While the trust is revocable, that's not right: a transfer you can undo isn't a completed gift. The Treasury regulation is explicit. Under 26 CFR 25.2511-2(c), "a gift is incomplete in every instance in which a donor reserves the power to revest the beneficial title to the property in himself." Because you keep the power to pull your assets back out of a revocable trust, putting them in isn't a gift yet.

The trap springs later, in two different ways. First, during life: if the joint structure gives your partner a vested withdrawal right you can't unilaterally revoke, that piece can become a completed gift now, the kind that uses up lifetime gift-tax exemption and can require a gift-tax return (Form 709). Second, at death: the deceased partner's share passing to the survivor gets no marital deduction to absorb it (more on that next), because that deduction is spouse-only. So the full value falls into the deceased partner's taxable estate and draws down their lifetime estate-tax exemption, with federal estate tax (Form 706) owed only if that estate is large enough to exceed the exemption. Two separate trusts never raise either question. Each partner's trust holds each partner's property, and transfers between them are deliberate and documented, not an accident of how you titled the trust.

The tax gap between a spouse and a partner

Marriage isn't just a label here. It triggers federal tax rules that are written, by their own terms, for spouses only, and an unmarried partner is shut out of all of them. But scope matters, so let's separate the disadvantages that hit everyone from the ones that only bite very large estates.

The disadvantage that hits everyone: state inheritance tax

A handful of states (currently Pennsylvania, New Jersey, Kentucky, Maryland, and Nebraska) levy an inheritance tax on what beneficiaries receive, and the rate depends on how related you were to the deceased. A spouse pays nothing. An unmarried partner is taxed in the highest, "unrelated" bracket. This applies at any estate size, which is exactly why it matters more for ordinary couples than the federal stuff does.

Pennsylvania charges 0% to a surviving spouse and 15% to "other heirs", which is where a longtime partner lands. New Jersey is sharper still. Its transfer inheritance tax puts a spouse, a civil-union partner, or a registered domestic partner in Class A, which is fully exempt, but it lists "live-in 'partners' who are not certified domestic partners" as a Class D beneficiary, taxed 15% on the first $700,000 and 16% above that. Same relationship, wildly different bill, decided entirely by a marriage certificate or a domestic-partnership registration.

The disadvantages that only bite large estates

Two more spouse-only rules exist, but they only matter to the wealthy. First, the unlimited marital deduction: a spouse can inherit any amount with zero federal estate tax. Under 26 U.S. Code 2056, that deduction is available only for property passing to a "surviving spouse." A partner gets none of it. Second, portability: a widow can also inherit her late spouse's unused exemption, the "deceased spousal unused exclusion," under 26 U.S. Code 2010(c). That, too, is spouse-only. A partner can't claim it.

Here's why those two rarely matter in practice: the federal estate-tax exemption is enormous. For 2026 the basic exclusion amount is $15,000,000 per person, up from $13,990,000 in 2025, and the annual gift exclusion is $19,000, per the IRS 2026 inflation adjustments. Unless your estate is approaching eight figures, you'll never owe federal estate tax, married or not, so the missing marital deduction costs you nothing.

One more that can matter at modest wealth: retirement accounts. A surviving spouse can roll an inherited IRA or 401(k) into their own and stretch withdrawals over a lifetime. A non-spouse partner can't. Under the SECURE Act, a non-spouse beneficiary generally must empty the account within 10 years. There's a narrow exception if your partner is no more than 10 years younger than you (an "eligible designated beneficiary"), but most couples won't fit it, so plan on the 10-year clock and the bigger tax bunching it can cause.

The part a trust alone won't fix

Death gets the attention, but for most couples the likelier near-term crisis is one partner ending up in the hospital, unconscious or unable to decide. A living trust handles your money in that moment through the successor trustee. It does nothing for medical decisions or for accounts outside the trust. Without separate documents, your partner has no legal authority, and your next of kin (the relatives the intestacy statute favors) do. Four documents close that gap, and an unmarried couple needs all four:

Married couples get a soft version of some of this by default, because hospitals and banks recognize a spouse. You get none of it by default. These forms are inexpensive and, frankly, the highest-value paperwork an unmarried couple can sign. Do them first, even before the trust.

Other ways to skip probate (and a trap that overrides your trust)

A living trust isn't the only probate-avoidance tool, and the others work alongside it. The catch is that they operate by their own rules and can quietly defeat your plan if you don't coordinate them.

• Beneficiary, POD, and TOD designations. Retirement accounts, life insurance, and bank or brokerage accounts let you name a beneficiary (payable-on-death or transfer-on-death) who inherits directly, no probate. For an unmarried couple this is one of the cleanest ways to leave money to a partner.
• Transfer-on-death deeds for real estate. Many (not all) states let you record a TOD deed so your home passes to your partner at death without probate. Availability and rules vary by state.
• Joint tenancy with right of survivorship. Co-own property so the survivor automatically takes full title. It works, but it has real downsides for unmarried couples: it exposes the asset to your partner's creditors, it can trigger gift-tax and basis issues, and once it's set up you can't easily undo it without the other person's cooperation.

If you have children together

Two things change when kids are in the picture. First, guardianship: only a will can nominate who raises your minor children if you die. A trust can't, which is reason enough for an unmarried parent to have a will no matter what. Name a guardian, and if you want it to be your partner, say so explicitly.

Second, legal parentage. If only one of you is the legal parent (common with a biological child from a prior relationship, or where one partner hasn't established legal parentage), the non-legal-parent partner may have no automatic right to custody or even contact if the legal parent dies. Second-parent or co-parent adoption, where your state allows it, is the durable fix: it makes both of you legal parents. A guardianship nomination in a will is a weaker backstop, because a court can still be petitioned by relatives. If kids are involved and you're not both legal parents, this is worth a lawyer's time.

State by state, and when to get a professional

Everything above is the national framework, but the details are set by your state, and they differ in ways that change the answer. Intestacy shares, whether TOD deeds exist, whether your state runs a domestic-partnership or civil-union registry (in some states, registering confers spouse-like inheritance and tax treatment, which can solve much of this in one step), and whether there's a state inheritance tax all vary. Treat the examples here as illustrations of how the rules work, not as the rule in your state.

This is YMYL territory, money and legal rights, so a few honest guardrails. The figures here are current for 2026 and every legal and tax claim is linked to a primary source (the actual statute, regulation, or government page) so you can verify it yourself. But a web page can't know your state, your assets, or your family. Before you sign anything, confirm it with a licensed estate-planning attorney or tax professional in your state. For an unmarried couple the stakes of getting it wrong are higher than for a married one, precisely because none of it happens automatically. The upside is the mirror image: a few well-drafted documents put you fully in control of an outcome the default rules would otherwise hand to people you didn't choose.