Adultery in Michigan is technically a felony under an old statute that almost no one is ever charged under, but it still carries real weight in divorce court. Even though Michigan is a no-fault divorce state, a judge can factor a spouse’s affair into spousal support, property division, and custody decisions. For most people asking about cheating and Michigan law, the practical stakes are financial and custodial, not criminal.
Is Adultery a Crime in Michigan?
Yes, on paper. Under MCL 750.30, any person who commits adultery is guilty of a felony.1Michigan Legislature. Michigan Compiled Laws 750.30 – Adultery; Punishment The statute does not set its own penalty, so Michigan’s general felony provision applies, carrying a maximum of up to four years in prison. The law also reaches the unmarried partner in the affair, making them equally liable.
Two built-in restrictions have made prosecution essentially extinct. Only the aggrieved husband or wife can file the complaint that starts a case. And the complaint must be filed within one year of the offense.2Michigan Legislature. Michigan Compiled Laws 750.31 – Adultery; Complaint and Time Limitation That window is shorter than the six-year limitation applied to most Michigan felonies.3Michigan Legislature. Michigan Compiled Laws 767.24 – Indictments; Finding and Filing; Limitations Affairs are often discovered after that year has already run, and prosecutors have no independent authority to charge. The statute is still on the books as of 2026, but treating the criminal risk as real would be a mistake for the vast majority of people.
No-Fault Divorce Does Not Mean Fault Is Ignored
You do not have to prove your spouse cheated to get divorced in Michigan. The only legal ground is that the marriage has broken down and reconciliation is not reasonably likely, and the complaint itself cannot detail what went wrong.4Michigan Legislature. Michigan Compiled Laws 552.6 – Complaint for Divorce; Filing; Grounds; Answer; Judgment
That is what “no-fault” means, and it stops there. Once the divorce is moving, a spouse’s conduct during the marriage is fair game. Michigan judges can consider fault when deciding spousal support and dividing property.5Michigan Legal Help. Introduction to Divorce without Children Adultery is the most common form of misconduct that surfaces in those fights.
How Adultery Affects Spousal Support
The spousal support statute gives judges wide discretion to consider “the character and situation of the parties, and all the other circumstances of the case.”6Michigan Legislature. Michigan Compiled Laws 552.23 – Judgment of Divorce or Separate Maintenance Michigan courts have long read that language to include marital misconduct.
A proven affair does not automatically raise or lower a support award. Judges weigh it alongside each spouse’s earning capacity, the length of the marriage, and the financial needs of both parties. Adultery matters most when it damaged the family’s finances or when the breakdown itself harmed one spouse’s earning potential. A brief affair with no financial footprint moves the needle less than a long-running relationship that drained the household budget.
How Adultery Affects Property Division
Michigan courts aim for a fair split of marital property, which usually lands close to equal. A judge can divide things unequally when one spouse bears more responsibility for the marriage ending.7Michigan Legal Help. Divorce Basics: Dividing Your Property and Debt Adultery is one of the reasons a court might tilt the balance.
Dissipation of Marital Assets
The strongest property argument tied to an affair is dissipation: one spouse spent marital money on something that benefited only them. Affairs tend to produce exactly that kind of spending. Hotel rooms, gifts, trips, a second apartment. If you can document that your spouse channeled marital funds into an outside relationship, a court can compensate you with a larger share of what remains.
Dissipation requires concrete evidence. Credit card statements, bank records, and receipts carry more weight than testimony about a spouse’s habits. You need to connect specific expenditures to the affair and show they reduced the marital estate. Scattered restaurant charges will not reshape a settlement; tens of thousands spent over months or years can.
Fault as a General Factor
Even without dissipation, adultery can figure into the overall fault analysis. Courts look at what each spouse contributed to the marriage, both parties’ needs and earning capacity, the length of the marriage, and why it ended.7Michigan Legal Help. Divorce Basics: Dividing Your Property and Debt Adultery on its own rarely produces a dramatic split, but stacked with other factors it adds weight.
How Adultery Affects Child Custody
Michigan custody decisions turn on the twelve best interest factors in the Child Custody Act.8Michigan Legislature. Michigan Compiled Laws 722.23 – Best Interests of the Child Defined Adultery is not named as a factor, but “the moral fitness of the parties involved” is. That is the doorway for infidelity arguments in a custody fight.
Courts applying the moral fitness factor look at whether the affair actually affected the child. Did the child know about it? Did it bring instability or conflict into the child’s daily life? Did it impair the parent’s ability to provide care?9Michigan Legal Help. The Best Interests of the Child Factors A discreet affair the child never learned about carries much less weight than a parent moving a new partner into the home while the divorce is pending.
The statute also includes a catch-all factor covering anything else relevant to the specific dispute.8Michigan Legislature. Michigan Compiled Laws 722.23 – Best Interests of the Child Defined In theory, courts require a direct connection between the conduct and harm to the child before penalizing a parent. In practice, some judges read an affair as poor judgment that colors their view of other factors like emotional stability and the home environment. If you are in a custody dispute and adultery is in the picture, expect the judge to form some impression of it.
Military Service Members Face Different Rules
If you or your spouse is in the military, the civilian analysis above does not tell the whole story. Adultery is a punishable offense under Article 134 of the Uniform Code of Military Justice, and military enforcement is far more active than Michigan’s civilian system. A service member can face charges when the sexual conduct was prejudicial to good order and discipline or brought discredit on the armed forces. The maximum penalty includes a dishonorable discharge, forfeiture of all pay and allowances, and up to one year of confinement. A dishonorable discharge can permanently affect veteran benefits, future employment, and firearm rights. For military families in Michigan, the adultery question is not theoretical.