Inheritance Rights for Unmarried Partners in Massachusetts

If you’re not legally married and your partner dies without a will, Massachusetts gives you nothing — even after thirty years together, even with children, even if you owned a home together. The estate passes by intestacy to the decedent’s biological family. There’s no surviving-partner equivalent of a surviving spouse under Massachusetts law. Almost every protection that married couples take for granted has to be deliberately built for unmarried couples through wills, trusts, beneficiary designations, and titling decisions.

This is one of the hardest conversations we have in our office. Couples who have been together for decades, raised children together, paid mortgages together — and one of them dies, and the surviving partner is suddenly fighting their late partner’s estranged sibling for the right to stay in their home.

It’s preventable. Here’s how.

What Massachusetts Intestacy Actually Says

Massachusetts intestacy — the rules that apply when someone dies without a will — distributes property in a fixed statutory order. The order, simplified:

1. Surviving spouse and descendants (with the spouse’s share depending on whether the descendants are also descendants of the spouse)
2. Descendants alone, if no spouse
3. Parents
4. Siblings and their descendants
5. Grandparents and their descendants
6. The Commonwealth, in extreme cases

Notice what’s not on that list: long-term partner, fiancé, life partner, “my person.” If you are not legally married — or do not have a valid common law marriage from another state that Massachusetts will recognize — you are not anywhere in this hierarchy.

We covered the common-law-marriage piece in detail in Does Massachusetts Recognize Common Law Marriage?. The short version: cohabitation alone, no matter how long, does not create a marriage in Massachusetts.

Probate without a will in Massachusetts walks through how the intestate distribution actually plays out.

What “Nothing” Actually Means in Practice

If your partner dies without a will:

• You don’t inherit the home, even if you contributed to the mortgage, even if you paid for the renovation. Whoever’s name is on the deed (alone) controls the property. If your partner owned the home solo, it goes to their family.
• You don’t inherit the joint stuff that wasn’t legally joint. A bank account in your partner’s name only — even if you both used it — is part of their estate.
• You don’t get a share of the retirement accounts unless you were named as beneficiary. The plan administrator will pay whoever’s listed.
• You don’t get the life insurance unless you’re the named beneficiary. If the policy lists “spouse” with no name and you’re not legally married, you’re out.
• You’re not entitled to be the personal representative. Under MUPC priority rules, family members come first. You may have to ask permission to attend the funeral planning, let alone manage the estate.
• You don’t have a right to anything in the home that’s titled in your partner’s name — vehicles, furniture, art, jewelry, anything.

If your partner had children from a previous relationship — especially adult children who didn’t approve of you — those children may end up with everything while you have to pack up and leave the home you’ve shared.

Joint Tenancy: The One Automatic Protection

There is one important asset structure that bypasses the inheritance problem entirely: joint tenancy with right of survivorship. Property held this way passes to the surviving joint tenant automatically, outside probate, regardless of intestacy or what the will says.

For unmarried partners, joint tenancy is often used for:

• The home (deed in both names as joint tenants with right of survivorship)
• A joint checking account
• Brokerage accounts that allow joint titling

Joint tenancy is powerful — but it’s not a substitute for an estate plan. It only works for the assets you’ve titled that way. It triggers gift-tax considerations when you add a partner to title. It exposes both partners’ assets to either partner’s creditors. And it doesn’t address what happens if both partners die together, or if the surviving partner dies shortly after.

Our walkthrough of joint tenancy vs tenants in common for unmarried couples covers the trade-offs in detail.

Beneficiary Designations: The Quiet Workhorse

The single highest-leverage thing an unmarried partner can do — beyond writing a will — is to update beneficiary designations. These pass property directly, outside probate, without going anywhere near intestacy.

Update beneficiary designations on:

• 401(k), 403(b), and pension plans
• Traditional and Roth IRAs
• Life insurance policies
• Annuities
• Bank accounts (transfer-on-death, payable-on-death)
• Brokerage accounts (TOD)
• Some real estate, in states that allow TOD deeds (Massachusetts does not currently)
• Health Savings Accounts (worth coordinating with the rest of the plan — see our overview of HSA inheritance)

One important caveat: ERISA-governed retirement plans like 401(k)s default to a surviving spouse and require the spouse’s written, notarized consent to name anyone else as beneficiary. For unmarried partners, this isn’t an issue — there’s no spouse whose consent is needed. The beneficiary form is decisive.

The Toolkit Every Unmarried Massachusetts Couple Needs

Here’s the practical floor:

1. A will for each partner that explicitly names the other as the primary beneficiary.
2. A revocable living trust, in many cases. Trusts give you privacy, avoid probate, and reduce the risk of a will contest by hostile family members. What is a living trust covers the basics.
3. A Massachusetts health care proxy. Without it, your partner cannot make medical decisions for you. Hospitals will turn to next-of-kin first. Our overview of the Massachusetts health care proxy explains how it works.
4. A durable power of attorney. Without it, your partner cannot pay your bills, sign for you, or manage your finances if you’re incapacitated.
5. Coordinated beneficiary designations across all retirement and insurance accounts.
6. Real estate titled to reflect your shared intent — joint tenancy, trust ownership, or, where appropriate, tenants in common with cross-bequests.
7. Documentation of contributions and intent. Especially for unmarried couples who’ve poured uneven contributions into shared property — keep records, draft a cohabitation agreement, document major contributions.

For couples with children together, the package extends — but the core remains. Why second-parent adoption matters covers the additional protections needed when only one partner is the legal parent of a child.

When Family Members Object

Even with a will, well-prepared estates can face challenges from biological family members who feel cut out. The most common will contest involves a long-term unmarried partner inheriting most or all of the estate while siblings or estranged children inherit nothing.

The grounds for contest are usually:

• Lack of testamentary capacity (the testator didn’t understand what they were doing)
• Undue influence (the partner pressured the testator)
• Improper execution (the will wasn’t properly witnessed)

The defenses are stronger when:

• The will was drafted by an experienced estate planning attorney
• The execution was properly witnessed and documented
• The pattern of estate planning was consistent over time, not a last-minute change
• A revocable living trust was used (trust contests are harder to win)
• The decedent’s intent was documented through letters, communications, or recorded conversations

Trusts in particular tend to deflect challenges. They’re private, they don’t go through probate’s adversarial structure, and the contest grounds are narrower. Our overview of why a revocable living trust is worth considering covers the upside.

Frequently Asked Questions

Do unmarried partners have any automatic inheritance rights in Massachusetts? No. Massachusetts intestacy does not include unmarried partners. The protections that come with marriage — elective share, marital deduction, automatic priority — do not apply.

What if we have children together? The children inherit under intestacy if the partner who is the legal parent dies. The surviving partner — if they’re not also the legal parent — may not have rights to act on the child’s behalf without separate steps like second-parent adoption.

Can my partner contest my parents’ inheritance if they’re cut out by the will? Massachusetts allows will contests on grounds of capacity, undue influence, or improper execution. Family members typically have standing to contest. Whether they can win depends on the facts and the quality of the planning.

Do we need to get married to be protected? No — but it’s the simplest path. A well-drafted estate plan can replicate most of the protections of marriage, except for some federal benefits (Social Security spousal, certain pension survivor benefits) that are inherent to legal marriage.

Is a domestic partnership registration in Boston or Cambridge enough? No. Local domestic partnership registrations carry limited municipal and employment benefits but do not produce inheritance rights under Massachusetts law.

What’s the most important step? A will and a Massachusetts health care proxy. Those two documents address the two most acute risks — inheritance and medical decision-making. Everything else can be layered on after.

Talk to a Massachusetts Estate Planning Attorney

If you and your partner are unmarried — by choice, by circumstance, or because you’re working toward a wedding that hasn’t happened yet — we’d be glad to help you build the protections that aren’t there by default.

The Law Offices of Kimberly Butler Rainen serves families and couples across Andover, North Andover, Reading, North Reading, Middleton, Georgetown, and the surrounding Merrimack Valley. Call or reach out through our contact page. Our estate planning services explain what working with us looks like.