Can a Fault Divorce Affect Spousal Support in Pennsylvania? What You Need to Know

October 31, 2026

Yes, but only at one stage. In Pennsylvania, a spouse whose conduct would qualify as grounds for a fault divorce, such as adultery, desertion, cruel treatment, or indignities, can be denied spousal support during separation. That defense does not carry over to alimony pendente lite (APL), which becomes the relevant claim once a divorce complaint is filed. And for alimony after the divorce, misconduct during the marriage is one factor among 17 that the court weighs, not an automatic bar. So whether an affair or an abandonment changes what you pay or receive depends less on how serious the conduct was and more on which support claim is on the table, and when. This article explains the entitlement defense, the six fault grounds that trigger it, where it stops, and how fault is treated at each stage of support.

That timing has real consequences. A spouse who could be denied spousal support may still receive the same monthly amount as APL by filing a divorce complaint first. A spouse counting on fault to stop payments may find it carries far less weight than expected once the case is in court, and less weight still once the decree is entered and alimony is on the table. If you want the three claims defined first, our overview of how support between spouses works before, during, and after a Pennsylvania divorce covers that.

The Entitlement Defense to Spousal Support

Pennsylvania law makes married persons liable for each other’s support according to their respective abilities to pay.^[1] Pennsylvania courts have long recognized one exception: a dependent spouse is entitled to support until it is proven that the dependent spouse’s own conduct would constitute grounds for a fault-based divorce.^[2] Lawyers call this the entitlement defense. The spouse raising it carries the burden of proving it, and the accused spouse can and should contest it. Suspicion, a hostile text thread, or the fact that one spouse moved out is not enough on its own.

The six fault grounds come straight from the Divorce Code. A court may grant a fault divorce to the innocent and injured spouse when the other spouse has:^[3]

committed willful and malicious desertion, without reasonable cause, for one year or more
committed adultery
endangered the life or health of the injured and innocent spouse by cruel and barbarous treatment
knowingly entered a bigamous marriage while a prior marriage was still in effect
been sentenced to imprisonment for two or more years after a criminal conviction
offered such indignities to the innocent and injured spouse as to render that spouse’s condition intolerable and life burdensome

Two of these grounds come up far more often than the rest in support cases: adultery, and indignities, which in practice is argued as a pattern of humiliating or degrading treatment rather than a single incident. Desertion requires more than leaving. The departure has to be willful, without reasonable cause, and last at least a year. Leaving to escape abuse is generally treated as a reasonable cause. Most Pennsylvania divorces proceed on no-fault grounds; the fault grounds matter here because the support rules borrow them. Our divorce page explains the difference between the fault and no-fault paths.

The accused spouse can answer. The traditional defenses to the fault grounds still apply. For adultery in particular, the statute lists defenses that include the accusing spouse having engaged in the same conduct, or having resumed marital relations after learning of the affair.^[4] Whether a failed reconciliation defeats the defense turns on the specific facts, so raise it with your attorney rather than assuming either way.

Timing: Conduct After Separation Usually Does Not Count

The entitlement defense looks at what happened during the marriage, before the parties finally separated. In S.M.C. v. W.P.C., a husband argued his wife should be denied spousal support because she began a relationship with another man days after she moved out. The hearing officer refused to hear evidence about it, the trial court awarded support, and the Superior Court affirmed, holding that post-separation conduct is not relevant to an entitlement defense.^[5]

The date of final separation is therefore a fact worth pinning down early. Conduct before that date can be raised. A new relationship that begins after it generally cannot.

Why the Defense Disappears With APL

Once a divorce complaint is filed, the dependent spouse’s claim is for alimony pendente lite rather than spousal support. The Divorce Code lets the court award APL, counsel fees, and expenses “in proper cases.”^[6] Pennsylvania courts describe APL as a tool to give both spouses equal financial resources to pursue the divorce litigation. It turns on the state of the case, not on the receiving spouse’s conduct or status.^[7] Because its purpose is to fund a fair fight in court, the courts have not applied the fault-based entitlement defense to it.

Practically, that means a spouse who would lose a spousal support claim to the entitlement defense can file a divorce complaint and request APL instead, calculated under the same guideline formula.^[8] A paying spouse who proved fault and stopped paying spousal support may find the obligation reappears as APL the moment the complaint is filed.

The one statutory bar. A spouse who has been convicted of committing a personal injury crime against the other spouse is not entitled to spousal support or APL, unless the court finds an award necessary to prevent manifest injustice. Any support the injured spouse paid between the offense and the conviction can be recovered by petition.^[9] If you are facing charges arising from an incident with your spouse, the outcome of the criminal case can decide your support rights. Lancaster Law Group handles the criminal charge and the family law case under one roof, and we coordinate the two when a client is exposed on both fronts.

Alimony After the Divorce: Fault Is a Factor, Not a Bar

Post-divorce alimony is discretionary. The court awards it only if it finds alimony is necessary, after weighing 17 statutory factors.[10] Factor 14 is the marital misconduct of either party during the marriage. The same provision tells the court not to consider misconduct that occurs after the date of final separation, with one exception: abuse of one spouse by the other, as that term is defined in the Protection From Abuse Act, is considered whenever it occurred.^[11]

So an affair during the marriage can weigh against the spouse who seeks alimony, and it can also weigh against the spouse who is asked to pay it. The statute does not say how much weight it gets. In practice, the economic factors, such as the length of the marriage, each spouse’s earning capacity, and whether the spouse seeking alimony can be self-supporting, tend to drive the result, with misconduct adjusting it at the margins.

What This Means for You

If you expect to pay support: the entitlement defense is a real tool, but only before a divorce complaint is filed, only for conduct during the marriage, and only if you can prove it. Weigh the cost of litigating fault against what a successful defense actually saves once APL is on the table.
If you expect to receive support: if you are worried about an entitlement defense, filing a divorce complaint converts your claim to APL and removes the defense. That decision has other consequences, so get advice before you file.
If there is abuse: your safety comes first. A protection order can be sought separately and quickly; our guide to what a protection order can do and how the hearing works explains the process. Abuse is also the one kind of post-separation conduct the alimony statute tells the court to consider.
On evidence: proof of fault has to be gathered lawfully. Do not log into a spouse’s accounts, read their devices without permission, or record conversations you are not a party to. Evidence obtained that way can create legal exposure of its own.

Decide on Fault With a Lawyer, Not on Instinct

Fault cases are won on dates, documents, and which claim is pending, not on how wronged either spouse feels. Whether you need to prove fault, defend against an entitlement defense, or protect your right to support once a complaint is filed, Lancaster Law Group’s attorneys will tell you early whether the facts support the position and what it is worth pursuing. Do not stop paying, file, or respond on your own read of the law. Call (717) 358-0600 or schedule a consultation first.

This article is general information, not legal advice. Reading it does not create an attorney-client relationship.