Cheating Spouse Divorce: What Adultery Changes in New York

Yes. DRL §170(4) still recognizes adultery as a fault ground and defines it as voluntary vaginal, oral, or anal sexual contact with someone other than the plaintiff after the marriage. New York repealed Penal Law §255.17 in November 2024, so adultery is no longer a crime, but it remains a civil ground for divorce.

Corroborating evidence beyond the plaintiff's own testimony is required, typically circumstantial proof of both opportunity and disposition. The evidentiary burden is higher than for a no-fault filing.

Even when adultery is proven, DRL §171 may bar the claim if the plaintiff procured or connived at the conduct, forgave it and voluntarily cohabited with knowledge of it, waited more than five years after discovery, or was also guilty of adultery.

These defenses are one reason many cases proceed under New York's no-fault ground rather than risking a contested fault hearing.

New York's no-fault ground under DRL §170(7) allows either spouse to obtain a divorce by stating that the relationship has broken down irretrievably for a period of at least six months. No proof of wrongdoing is required, and the DRL §171 defenses do not apply.

Filing on no-fault grounds avoids the evidentiary complications of a fault case, reduces litigation costs, and reaches the same legal result. Adultery-based filing may be appropriate when the fault ground carries a specific strategic purpose, such as negating a defense raised by the other side.

Adultery alone does not change how marital assets are divided. Courts focus on the economic partnership of the marriage, not the moral conduct of the spouses.

The exception is when the spouse who had the affair spent marital funds on it. Dissipation of marital assets, such as spending joint funds on gifts, travel, hotels, or other expenses for a third party, can be treated as marital waste and offset against that spouse's share.

Marital waste requires showing that one spouse deliberately depleted marital assets for purposes unrelated to the marriage. Documented expenditures on a paramour, such as credit card records, bank withdrawals, hotel receipts, or payment app transfers, can support a waste claim.

Courts consider the amount and timing of the expenditures relative to the marriage. The other spouse may receive a larger share of remaining marital assets to offset the amount dissipated. The goal is to trace specific funds to specific affair-related spending through financial records, including bank statements, credit card histories, and tax returns compared against known patterns.

Adultery alone generally does not eliminate maintenance. Courts apply the DRL §236B statutory factors, which focus on income, earning capacity, and financial need. Affair-related spending may be relevant as wasteful dissipation, and conduct that directly impaired the other spouse's earning capacity may also affect the analysis. Infidelity alone, however, does not eliminate a support award.

Leaving the marital home does not by itself waive maintenance or equitable distribution rights. Moving out can affect occupancy, custody logistics, and litigation strategy and should be discussed with counsel before taking that step.

Constructive abandonment is a distinct fault ground that generally concerns an unjustified refusal of sexual relations for at least one year, not simply a spouse departing the marital residence.

To prove adultery as a divorce ground, corroborating evidence beyond the plaintiff's own testimony is required. The plaintiff's testimony alone is not sufficient.

Courts have accepted the following as corroboration:

• Witness testimony of the parties together in circumstances consistent with an intimate relationship
• Hotel records or credit card statements placing the spouse and a third party in the same location
• Text messages or emails establishing both disposition and opportunity
• Private investigator reports documenting the spouse's movements
• Photographs or videos in relevant circumstances

Hotel records, PI reports, and electronic communications are not automatically admitted and may require authentication and supporting testimony at trial.

A waste claim is built on financial records that trace affair-related spending. The most useful starting points are bank statements showing unusual cash withdrawals, credit card records with unaccountable charges, payment app transfers to the paramour, and tax returns compared against known spending patterns.

Preserve originals and metadata of financial records and communications before confronting a spouse or filing. Documents deleted or altered after litigation begins can become the subject of spoliation arguments.

A parent's extramarital relationship does not by itself affect custody. New York courts apply the best-interests standard under DRL §240, focusing on each parent's relationship with the child, stability, and willingness to support the child's relationship with the other parent.

Adultery becomes relevant only when it directly affects the child, such as when a parent exposes the child to an inappropriate relationship or the conduct was harmful to the child's well-being.

No. Child support in New York is calculated under the Child Support Standards Act based on the parents' combined income and a statutory percentage. Marital misconduct is not a factor. The court's focus is on the child's financial needs and each parent's ability to contribute.

No. New York abolished civil actions for alienation of affections and criminal conversation under Civil Rights Law §80-a, enacted in 1935. A lawsuit against the person your spouse had an affair with is not available in New York. The legal focus is on the economic consequences of the affair within the marriage through equitable distribution and waste claims.

Filing first may allow a spouse to choose among legally proper venues and frame the initial pleadings. New York's automatic orders bind the plaintiff upon filing and the defendant upon service, restricting both parties from transferring or concealing marital assets. Filing first does not create a substantive advantage in property division, maintenance, custody, or child support.

Cheating during divorce proceedings is relevant if marital funds continue to be spent on the affair. Courts can consider post-separation dissipation in equitable distribution, and ongoing affair-related spending may affect temporary maintenance.

New York's automatic orders generally restrict either spouse from transferring or disposing of marital assets outside ordinary expenses. If those protections are violated or prove insufficient, counsel may seek enforcement, contempt remedies, or additional injunctive relief.

A prenuptial agreement may include provisions tied to infidelity, such as adjustments to property division or support in the event of adultery. An infidelity clause is not automatically enforceable. A New York court may examine the agreement's execution, disclosure, voluntariness, fairness, the wording of the trigger, the available proof, and possible public-policy concerns before determining whether the provision applies.

An uncontested divorce generally moves faster once all financial and parenting issues are resolved, but processing times vary by county and filing completeness. A contested divorce may take substantially longer depending on discovery, asset valuation, custody disputes, motions, settlement efforts, and trial availability.

Adding an adultery fault ground can extend the timeline because it may require additional evidentiary preparation and a contested hearing. Filing on no-fault grounds typically moves the case more efficiently toward resolution.

An attorney can review the grounds, the available evidence, any waste or maintenance concerns, and the immigration or licensing implications before any pleading is filed or any statement is made to the other side.