✓ Verified September 2026
To contest a will in Michigan, you file in the probate court within a fixed window and prove one of a short list of legal grounds. This guide gives the Michigan answer in plain English, and it starts with the deadline, because that is the fact that ends more cases than any other. All facts are from Michigan law, verified as of September 2026.
In This Michigan Guide:
Contest a Will in Michigan: At a Glance
Here are the Michigan facts that decide whether you can contest a will in Michigan:
| Deadline to contest | Depends on the probate track. FORMAL TESTACY: objections must be filed and heard BEFORE the court enters the order admitting the will (MCL 700.3401, MCL 700.3404); once that order is entered it is final as to all persons given notice, and the remaining window is 21 days to file an appeal of right (MCR 5.801; MCR 7.204(A)(1)) or a petition to vacate under MCL 700.3412, which must be filed by the EARLIER of (a) entry of the order approving final distribution, or 6 months after a closing statement is filed, or (b) 12 months after entry of the order sought to be vacated. INFORMAL PROBATE (register’s order): no fixed contest cutoff — an interested person contests by petitioning for a formal testacy proceeding under MCL 700.3401 to set aside the informal order, subject to the outer 3-year (1095-day) limit on commencing probate/testacy proceedings after the decedent’s death. The 21 days is the single most important number for anyone who received notice of a formal hearing. |
| What starts the clock | For the formal track, the clock is the NOTICE OF HEARING on the petition for probate/formal testacy (MCL 700.3403, served at least 14 days before hearing under MCR 5.108) — objections are due before that hearing; the 21-day appeal clock starts on ENTRY OF THE ORDER ADMITTING THE WILL TO PROBATE; the MCL 700.3412 vacation clock starts on entry of that same order. For the informal track, there is no notice-triggered contest clock — the outer limit runs from DATE OF DEATH. |
| Who can contest | “Interested persons” as defined at MCL 700.1105(c) — the incumbent fiduciary; an heir, devisee, child, spouse, creditor, and beneficiary; any other person having a property right in or claim against the estate; a person with priority for appointment as personal representative; and a fiduciary representing an interested person. This includes beneficiaries under a prior will whose share would improve if the offered will fails, and it expressly includes creditors. Standing is determined “according to the particular purposes of, and matter involved in, a proceeding” (MCL 700.1105(c)), so it is assessed claim by claim. |
| No-contest clause | YES with a probable-cause exception. MCL 700.2518: “A provision in a will purporting to penalize an interested person for contesting the will or instituting other proceedings relating to the estate is unenforceable if probable cause exists for instituting proceedings.” Reinforced for estate administration at MCL 700.3905, and for trusts at MCL 700.7113. Probable cause is decided by the court hearing the action, so a Michigan no-contest clause fails whenever the challenger had a reasonable belief the challenge would succeed. |
| What the filing is called | Objections to the petition, and/or a “Petition for Probate and/or Appointment of Personal Representative (Testate/Intestate)” seeking FORMAL TESTACY — SCAO form PC 559 — filed in the probate court of the county of venue. To undo an informal probate, the filing is a petition for a formal testacy proceeding under MCL 700.3401; to undo an existing formal order it is a petition to vacate under MCL 700.3412. Michigan does not use a separate “will contest complaint” — the contest is raised inside the probate case. |
| Court | The Michigan Probate Court for the county where the decedent was domiciled at death, or where property is located if the decedent was not a Michigan domiciliary (venue under MCL 700.3201). Probate courts have exclusive legal and equitable jurisdiction over will validity and estate administration under MCL 700.1302 and MCL 600.841. |
| Jury trial | YES. MCL 600.857 preserves the right to demand a jury in probate court on any issue of fact for which a jury could have been demanded in circuit court on de novo appeal before January 1, 1971 — will validity is such an issue. Procedure: written jury demand within 28 days after the issue is contested (MCR 5.158(A)(1)); if trial is set within 28 days of joinder, the demand must be filed at least 4 days before trial; a party not served with notice at least 7 days before hearing may demand a jury any time before the set hearing time. Jury conduct is governed by MCR 2.508–2.516. |
| Typical cost | UNVERIFIED for a total range — Michigan courts do not publish contested-case cost data. Verified fee components only: 20 dollars to file a motion, petition, objection, or claim after a proceeding has commenced (MCL 600.880b); 25 dollars electronic filing system fee; 175 dollars initial estate commencement filing fee. Michigan follows the American rule — each side pays its own attorney fees — with an exception allowing the court to award fees and expenses against a party who acted in bad faith or unreasonably. Anyone budgeting a contested case should get a written fee estimate from a licensed Michigan probate attorney. |
The Deadline to Contest a Will in Michigan
The window is short in some states and long in others, and it is measured from a specific event rather than from the day you learned about the will. That is why the first thing to find out is the date the will was admitted and whether you received formal notice. If the deadline has not run, everything else on this page is available to you.
If it has, the remaining options are narrow and usually involve proving you never got the notice the law required.
Grounds to Contest a Will in Michigan
Lack of testamentary intent; lack of testamentary capacity (MCL 700.2501 — testator must be 18 or older, of sound mind, able to comprehend the nature and extent of property, recall the natural objects of bounty, and understand the disposition); undue influence; fraud; duress; mistake; revocation (MCL 700.2507); and improper execution/forgery — failure of the formalities in MCL 700.2502 (signed by testator,
witnessed by 2 individuals who sign within 28 days of witnessing) or the holographic will requirements.
All are enumerated as contest grounds in MCL 700.3407(1)(c).
Who has to prove what: Split by issue under MCL 700.3407(1). The PROPONENT has the burden of establishing prima facie proof of due execution and death, and of the will’s contents. The CONTESTANT then has the burden of establishing lack of testamentary intent or capacity, undue influence, fraud, duress, mistake, or revocation.
Standard is preponderance of the evidence, and the party with the initial burden of proof carries the ultimate burden of persuasion (MCL 700.3407(1)(d)).
Michigan recognizes a PRESUMPTION OF UNDUE INFLUENCE where the contestant shows (1) a confidential or fiduciary relationship, (2) that the fiduciary or an interest the fiduciary represents benefits from the transaction, and (3) that the fiduciary had an opportunity to influence the grantor’s decision (In re Karmey Estate, 468 Mich 68 (2003); Kar v Hogan, 399 Mich 529 (1976)).
The presumption creates a mandatory inference and shifts the burden of going forward; once the proponent introduces rebuttal evidence the presumption drops out, and the contestant retains the ultimate burden of persuasion. A SELF-PROVED WILL under MCL 700.2504 is conclusively presumed as to signature requirements, so execution formalities cannot be contested — but capacity, undue influence, and fraud still can.
Who Can Contest a Will in Michigan
“Interested persons” as defined at MCL 700.1105(c) — the incumbent fiduciary; an heir, devisee, child, spouse, creditor, and beneficiary; any other person having a property right in or claim against the estate; a person with priority for appointment as personal representative; and a fiduciary representing an interested person. This includes beneficiaries under a prior will whose share would improve if the offered will fails, and it expressly includes creditors.
Standing is determined “according to the particular purposes of, and matter involved in, a proceeding” (MCL 700.1105(c)), so it is assessed claim by claim. Being unhappy with the will is not standing; losing something because of it is. Check the earlier will and the intestate rules for Michigan before filing, because they decide whether you are an interested person.
No-Contest Clauses in Michigan
YES with a probable-cause exception. MCL 700.2518: “A provision in a will purporting to penalize an interested person for contesting the will or instituting other proceedings relating to the estate is unenforceable if probable cause exists for instituting proceedings.” Reinforced for estate administration at MCL 700.3905, and for trusts at MCL 700.7113.
Probable cause is decided by the court hearing the action, so a Michigan no-contest clause fails whenever the challenger had a reasonable belief the challenge would succeed.
The Steps to Contest a Will in Michigan
Step one is the deadline check above. Step two is evidence: the medical records around the signing date, the names of the witnesses, the drafting lawyer’s file, and the financial records that show who benefited.
Step three is the filing — Objections to the petition, and/or a “Petition for Probate and/or Appointment of Personal Representative (Testate/Intestate)” seeking FORMAL TESTACY — SCAO form PC 559 — filed in the probate court of the county of venue.
To undo an informal probate, the filing is a petition for a formal testacy proceeding under MCL 700.3401; to undo an existing formal order it is a petition to vacate under MCL 700.3412. Michigan does not use a separate “will contest complaint” — the contest is raised inside the probate case..
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Step four is discovery and, in most cases, a settlement conference; the small minority that reach trial are decided by a jury if requested.
Settling Instead of Fighting
YES. MCR 5.143 authorizes the probate court to submit any dispute, including a will contest, to mediation or another alternative dispute resolution process. MCL 700.3914 permits a court-approved compromise of a controversy over admission of a will, construction, or distribution, binding on all parties including unborn, unascertained, and incapacitated persons when approved after notice and hearing.
MCL 700.3952 allows successors to settle by written agreement and close the estate; MCL 700.3951 covers closing by universal succession. Most Michigan will contests resolve by agreement rather than trial.
Other Michigan rules: (1) NO ante-mortem/pre-death will validation — Michigan has no living-probate statute, so a will can only be challenged after death. (2) SELF-PROVED WILLS: MCL 700.2504 makes signature requirements conclusively presumed, narrowing a contest to substantive grounds.
(3) HARMLESS ERROR: MCL 700.2503 lets the probate court treat a defectively executed document as a valid will if the proponent establishes by CLEAR AND CONVINCING EVIDENCE that the decedent intended it as a will — a higher standard than the preponderance rule elsewhere, and it can defeat an execution-based challenge.
(4) HOLOGRAPHIC WILLS are valid under MCL 700.2502(2) if dated and with material portions and the signature in the testator’s handwriting, with no witnesses required. (5) Michigan uses a STATUTORY WILL (MCL 700.2519), a fill-in-the-blank form that is fully valid.
(6) The formal/informal split is the defining feature: choosing informal probate leaves the will open to a later formal testacy challenge, while a formal order becomes final in 21 days as to everyone who received notice. (7) A contest lost on the merits does not by itself trigger a no-contest clause if probable cause existed.
The Evidence That Wins or Loses a Will Contest
Capacity cases turn on the weeks around the signing: the medical chart, prescriptions, a dementia diagnosis, and what the drafting lawyer and the witnesses saw that day. A will signed in a lawyer’s office with two disinterested witnesses and a self-proving affidavit is hard to attack; a will signed at a kitchen table with the main beneficiary present is not.
Undue influence cases turn on the relationship — who drove the parent to the appointment, who chose the lawyer, who was in the room, and whether the new will departed sharply from earlier ones and from what the parent said to other people.
Improper execution is the narrowest ground and the cleanest: Michigan sets exact witness and signature rules, and a will that misses them fails regardless of what the signer intended. Before you contest a will in Michigan, gather the prior wills, the medical releases, and the names of everyone at the signing.
Most of that evidence has to be requested formally once the case is filed, and the deadline does not wait for it.
What to Expect When You Contest a Will in Michigan
A will contest is a lawsuit about the document, not about fairness. When you contest a will in Michigan, the court asks whether the person who signed it had capacity, signed it freely, and signed it correctly. It does not ask whether the split was reasonable. That is why the strongest cases rest on medical records and witness accounts from the weeks around the signing.
Most families who contest a will in Michigan settle. Courts encourage it, many states have family settlement rules that let the heirs agree to a different division, and a settlement avoids the cost and delay of trial. The deadline, the grounds, and the no-contest clause above are the three facts that set your bargaining position before any of that begins.
You don’t have to do this alone
If you are settling a loved one’s estate in Michigan, your state’s probate court self-help center and free legal-aid offices can walk you through the process at no cost. For an active probate or a deadline, talk to a licensed probate attorney in your state.
Key Takeaways: Contest a Will in Michigan
- The deadline is everything: the window to contest a will in Michigan closes on a fixed schedule, and the court cannot reopen it for a late but valid claim.
- Grounds are specific: you contest a will in Michigan on capacity, undue influence, fraud, duress, or bad execution, never on unfairness alone.
- Standing first: only an interested person can contest a will in Michigan; check whether you inherit under the prior will or the intestate rules.
- Read the no-contest clause: whether the state enforces it decides how much risk it takes to contest a will in Michigan.
- Evidence is medical and financial: records, witnesses to the signing, and the drafting lawyer’s file decide most cases when you contest a will in Michigan.
- Settlement is common: most families who contest a will in Michigan settle before trial, often through the state’s family settlement rules.
- Find the admission date: the day the will was admitted is the day the clock to contest a will in Michigan usually starts.
- Prior wills matter twice: they give you standing to contest a will in Michigan and show how far the last will departed from the pattern.
- Notice defects are a lifeline: if you never got the required notice, you may still contest a will in Michigan after the ordinary deadline.
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Official Michigan Sources & Resources
- Michigan Probate Court: https://www.michbar.org/public_resources/probate2
- Michigan Will Contest Statute: https://www.legislature.mi.gov/Laws/MCL?objectName=mcl-700-3407
- Internal Revenue Service — Estate Tax: irs.gov
- Cornell Legal Information Institute: law.cornell.edu/wex
This Michigan guide was last verified against official sources in September 2026. Laws change — verify with your state court or a licensed attorney.
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Disclaimer: This guide is informational only and is not legal or tax advice. Estate, probate, and tax laws change and vary by state and county. Verify current rules and dollar figures with your state’s court, statute, or a licensed attorney or tax professional before acting. For urgent matters like an active probate or a tax deadline, consult a licensed professional in your state right away.