The difference between fault and no-fault divorce comes down to whether you have to prove your spouse did something wrong. In a no-fault divorce, available in all 50 states, you simply tell the court the marriage is over. In a fault-based divorce, available in roughly 33 states, you accuse your spouse of specific misconduct like adultery, cruelty, or abandonment and back it up with evidence. Both paths end the marriage. The reason to choose one over the other is almost always money: proving fault can increase your share of marital property or spousal support in states that let judges weigh misconduct.
How No-Fault Divorce Works
A no-fault filing lets either spouse end the marriage without blaming the other. You state that the relationship is over, typically using language the statute provides — “irreconcilable differences” or “irretrievable breakdown of the marriage.” One spouse’s testimony that the marriage cannot be saved is usually enough. The other spouse does not have to agree, and the court will not investigate who caused the breakdown.
This is the dominant path for a reason. It keeps private behavior out of the record, reduces hostility, and lets both sides focus on dividing property and arranging custody. Settlements move faster when no one is being assigned blame, and uncontested cases often resolve without a trial.
Separation Periods in Some States
Not every state grants a no-fault divorce on the strength of your word alone. Some require the couple to live in separate households for a continuous period first, treating the physical separation as proof that the marriage has genuinely ended. These periods range from 60 days to 18 months or longer, depending on the state and on factors like whether minor children are involved or whether the spouses signed a separation agreement.
The rules during separation are strict. The couple must maintain separate residences and stop living as a married couple. Moving back in together, even briefly, usually resets the clock. States without a mandatory separation period often still impose a short waiting period between filing and the final decree.
Fault Grounds You Can File On
In states that still recognize fault-based divorce, you have to prove your spouse engaged in misconduct the statute specifically names. The most common grounds are:
- Adultery. A voluntary sexual relationship outside the marriage. Suspicion is not enough; courts expect messages, financial records, or witness testimony.
- Cruelty. Physical violence or a pattern of mental abuse that makes continued cohabitation unsafe or intolerable. Isolated arguments do not qualify — courts look at severity and frequency.
- Abandonment. One spouse leaving the shared home for a sustained period, usually at least a year, without the other’s consent and with no intention of returning.
- Imprisonment. A felony conviction followed by incarceration, typically for a year or more.
- Substance abuse. Habitual drug or alcohol abuse that damages the marriage. Some states list this separately; others fold it into cruelty.
The burden of proof sits entirely on the spouse making the accusation. That means collecting documentation, witness statements, police reports, or financial records that substantiate the claim. Fault cases take longer, cost more, and put private details into the public court file. The filing fees themselves are similar to a no-fault case, but the evidence gathering, longer hearings, and additional attorney time make fault litigation significantly more expensive overall.
Why File on Fault at All
If no-fault is simpler, cheaper, and available everywhere, why would anyone choose the harder road? Usually because fault can change the financial outcome in states that allow judges to weigh it.
Spousal Support
A significant number of states let courts consider marital misconduct when deciding whether to award alimony, how much, and for how long. A spouse who committed adultery may be barred from receiving spousal support entirely, or may see the amount cut sharply. The wronged spouse may receive more, or receive it for longer. States differ on how heavily this counts — some treat fault as one factor among many, others make it decisive.
Property Division
The picture on property is more mixed. Many states use an equitable distribution model that explicitly excludes marital misconduct from property decisions. Others do factor it in, particularly when the behavior had direct economic consequences for the family. A spouse who drained savings to fund an affair, or ran up gambling debts, may end up with a smaller share of what’s left.
Dissipation of Marital Assets
Dissipation is where fault and finances overlap most directly. It happens when one spouse wastes or hides marital assets after the marriage has broken down but before the divorce is final — extravagant spending on a new partner, transferring property to relatives, or destroying something valuable. When a court finds dissipation, it typically reduces the offending spouse’s share of the remaining property by the amount that was wasted. If one spouse moved a $200,000 asset out of reach, that figure gets charged against their share of everything else. Courts sometimes order direct repayment.
To win a dissipation claim, you generally have to show that the asset was under the other spouse’s control, that the spending or transfer happened after the marriage broke down, and that there was no legitimate reason for it. Paying a divorce lawyer or covering normal household expenses does not count. The spending has to be unrelated to the marriage or clearly wasteful.
What Fault Does Not Do: Custody
Parents in fault-based divorces often assume the misconduct allegations will decide custody. In most states that fear is overblown. Custody turns on the best interest of the child, which is a separate legal analysis from the grounds for divorce. Being a bad spouse does not automatically make someone a bad parent, and courts hold that line consistently.
The exception is when the conduct directly affects the children. A history of domestic violence or substance abuse is a safety concern judges weigh heavily, as are allegations of physical or sexual abuse — regardless of whether the divorce itself is filed on fault or no-fault grounds. Adultery alone, with no impact on the children, rarely changes the custody outcome.
Defenses If You’re the Accused Spouse
If your spouse files on fault grounds, you have more than one way to push back. Four traditional defenses have come down through centuries of family law, and while their availability varies by state, they still appear in fault cases.
- Condonation. You argue your spouse already knew about the misconduct, forgave it, and resumed the marriage. This comes up most in adultery cases: if your spouse discovered the affair, chose to stay, and continued the relationship, that forgiveness can block a later filing based on the same affair.
- Recrimination. Both spouses committed conduct that qualifies as fault. If the filing spouse also committed adultery or cruelty, neither party has clean hands. In some states this blocks the divorce entirely; in others it simply neutralizes the fault claim.
- Connivance. The filing spouse set up the situation they are now complaining about. This defense appears almost exclusively in adultery cases — a spouse who arranged for the other to meet someone specifically to create grounds.
- Collusion. Both spouses conspired to fabricate grounds, with one pretending to commit misconduct so the other could file. Because it involves fraud on the court, judges take it seriously when it surfaces.
These defenses are fact-intensive and require their own evidence. They reflect an older legal framework that predates no-fault divorce. In practice, most respondents today either contest the factual allegations directly or file a counterclaim on different grounds rather than rely on these historical doctrines.
Covenant Marriage: A Narrower Path
Three states — Louisiana, Arizona, and Arkansas — offer a separate category called covenant marriage that imposes stricter rules for both entering and leaving. Couples who choose a covenant marriage agree upfront to seek counseling before filing for divorce and to dissolve the marriage only on limited grounds.
Those grounds are narrower than standard fault grounds and typically include adultery, a felony conviction resulting in imprisonment or a death sentence, abandonment for at least a year, physical or sexual abuse of a spouse or child, and habitual substance abuse. Alternatively, the spouses can divorce after living separately for a continuous period, usually one to two years depending on the state. The mandatory counseling requirement applies before a petition can even be filed. Covenant marriages are a small share of total marriages, but spouses in one face a meaningfully harder path out.