Michigan Affidavit of Heirship for Unmarried Partners

If your unmarried partner passed away and owned property in Michigan, you may have just discovered a painful truth: the law does not automatically recognize you as an heir. Without a will, your partner's assets typically go to blood relatives under Michigan's intestate succession laws. This leaves many surviving partners in a difficult spot especially when they shared a home, finances, or decades of life with someone they never legally married. A Michigan affidavit of heirship for unmarried couples after death is one tool that can sometimes help establish your connection to your partner's estate, but the process comes with serious limitations you need to understand before moving forward.

What is an affidavit of heirship, and how does it work in Michigan?

An affidavit of heirship is a sworn legal document that identifies the rightful heirs of a deceased person's estate. In Michigan, it is commonly used to transfer title to real property such as a house or land without going through full probate court. The affidavit is typically signed by someone who knew the deceased and can swear to their family history, marital status, and surviving relatives. Once filed with the county register of deeds, it can clear the chain of title for real estate.

Michigan does not have a single, universal statute governing affidavits of heirship the way some states do. Instead, the practice relies on a combination of Michigan probate law, common usage accepted by title companies, and county register of deeds requirements. You can learn more about how the step-by-step process works for real property in a separate guide.

Why is this so complicated for unmarried couples?

Michigan's intestate succession laws found in the Michigan Estates and Protected Individuals Code (EPIC) distribute a deceased person's property to their closest legal relatives. That means children, parents, siblings, and extended family. Nowhere in the intestate succession statute does Michigan recognize an unmarried partner as a legal heir.

This creates a hard reality. If your partner died without a will and you were not married, you generally have no automatic legal right to their property, bank accounts, or personal belongings even if you lived together for 20 years, shared expenses, or raised children together.

An affidavit of heirship, by its nature, lists the legal heirs. Since an unmarried partner is not a legal heir under Michigan intestate law, the affidavit typically cannot list you as an heir unless other conditions apply (such as a joint tenancy with right of survivorship, a beneficiary deed, or a written will naming you).

Can an unmarried partner ever benefit from an affidavit of heirship in Michigan?

There are narrow circumstances where an affidavit of heirship can still matter to a surviving unmarried partner:

Joint ownership existed. If both names were on the deed as joint tenants with right of survivorship, the surviving partner may already own the property automatically. An affidavit of heirship can help confirm there are no competing claims.
The deceased left a will naming you. If your partner had a valid will that left property to you, the affidavit may be used to support a transfer of that specific asset, though probate may still be required.
You need to clear title for other reasons. Sometimes the heirs listed in the affidavit are the deceased's family members, and the surviving partner needs those heirs to cooperate. An affidavit documenting who those heirs are can be a starting point for negotiation or a separate legal claim.
Equitable claims may exist. In some cases, a surviving partner may have a claim based on contributions to the property mortgage payments, improvements, or a shared agreement. This would require a separate civil action, not just an affidavit.

Does Michigan recognize common-law marriage?

No. Michigan abolished common-law marriage and does not recognize new common-law marriages formed within the state. If you and your partner never had a legal marriage ceremony, Michigan does not treat you as a spouse for inheritance purposes regardless of how long you lived together.

There is one exception: if a couple established a valid common-law marriage in a state that recognizes them (like Colorado, Iowa, or Texas) and then moved to Michigan, Michigan may honor that marriage. But this is a narrow path and requires strong proof.

What happens to shared property when an unmarried partner dies without a will?

This depends entirely on how the property was titled:

Tenancy in common: If both partners held the property as tenants in common, the deceased partner's share does not automatically pass to the surviving partner. It goes through intestate succession to their legal heirs typically parents or siblings.
Joint tenancy with right of survivorship: The surviving partner automatically receives the deceased's share. No affidavit of heirship is needed for the deceased's portion.
Sole ownership by the deceased: The property passes entirely through intestate succession or probate. The surviving partner has no automatic claim.

This is one of the most common and painful situations unmarried couples face. You can read more about how the affidavit process compares to going through probate court to understand which path fits your situation.

How do you file an affidavit of heirship in Michigan?

If the situation calls for an affidavit such as when the deceased's family agrees the property should transfer a certain way the basic process involves:

Gathering information about the deceased: Full legal name, date of death, last known address, marital status, and a complete list of heirs under Michigan law.
Finding a disinterested witness: Someone who knew the deceased and their family but is not an heir themselves. This person signs the affidavit under oath.
Preparing the affidavit: The document must state the decedent's family history, list all heirs, and confirm whether the decedent had a will or any outstanding debts.
Getting it notarized: A Michigan notary public must witness the signing.
Filing with the register of deeds: The affidavit is recorded in the county where the real property is located.

For a full walkthrough, see the guide on filing without going through probate.

What are the most common mistakes unmarried partners make?

Assuming they have rights because of a long relationship. Michigan law does not care how long you lived together. Without a will, marriage, or joint ownership with survivorship rights, length of relationship alone gives you no legal standing as an heir.

Filing an affidavit that lists themselves as an heir when they are not one under the law. This is legally risky. If a blood relative challenges the affidavit, it will not hold up, and you could face legal consequences for making a false sworn statement.

Waiting too long. Michigan has time limits on various probate and property claims. The longer you wait, the harder it can become to assert any rights including equitable claims based on your contributions to the property.

Not consulting a probate attorney. Every situation is different. An attorney who handles Michigan estate law can tell you whether an affidavit of heirship, a probate petition, or a separate civil action is the right move.

What can an unmarried partner actually do to protect their interests?

If your unmarried partner has already passed away, your options may include:

Check how the property was titled. Review the deed. If you are on it as a joint tenant with right of survivorship, you likely already own the full property.
Look for a will. A valid will naming you as a beneficiary changes everything. Probate may still be required, but you would have a legal claim.
Document your contributions. If you paid mortgage, taxes, or made improvements, gather records. These may support an equitable claim in court.
Work with the legal heirs. In some families, the deceased's relatives are willing to acknowledge your role and cooperate with a property transfer. An affidavit of heirship identifying those heirs is a practical starting point.
Consult a Michigan estate attorney. This is not a DIY situation if significant assets are at stake.

If the deceased owned property in another state or you live outside Michigan, there may be additional filing requirements. The rules for non-resident heirs filing in Michigan can add another layer of complexity.

Should unmarried couples in Michigan take steps now to prevent this problem?

Absolutely. If you are currently in an unmarried partnership in Michigan, the best thing you can do is plan ahead while both partners are alive and healthy:

Create a will. A valid Michigan will lets you leave property to your partner directly.
Title property carefully. Joint tenancy with right of survivorship ensures the surviving partner gets the property automatically.
Consider a transfer-on-death deed. Michigan allows these for real property, letting you name your partner as the beneficiary.
Review beneficiary designations. Bank accounts, retirement accounts, and life insurance can all name your partner as a beneficiary regardless of marital status.
Put agreements in writing. If you share a home, a written co-ownership agreement can protect both parties.

The American Bar Association offers additional background on estate planning resources that may be useful as a starting point.

Quick Checklist for Unmarried Partners Dealing with a Michigan Affidavit of Heirship

Confirm whether the deceased had a valid will naming you as a beneficiary
Check the deed to see how the property was titled (joint tenancy vs. tenancy in common vs. sole ownership)
Determine whether you are a legal heir under Michigan intestate succession law
Do not sign an affidavit listing yourself as an heir if you are not one under the law
Gather any documents showing financial contributions to shared property
Contact a Michigan probate or estate attorney before filing anything with the register of deeds
Act promptly delays can weaken your position and allow others to take control of the estate