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A separation agreement in New York must include consent from both spouses to be valid. This mutual agreement signifies that both parties are voluntarily entering into the terms outlined in the document, which governs issues such as property division, support obligations, and custody arrangements. The requirement for mutual consent is central to the enforceability of the agreement, as it reflects the willingness of both spouses to contractually agree on the terms of their separation.

While written documentation is necessary, simply having it in writing is not sufficient if both parties do not consent. Filing the agreement with the court is not a requirement for the validity of the separation agreement, although doing so may provide certain legal benefits, such as making the agreement enforceable in court. Financial disclosures, while advisable to facilitate transparency and fair negotiations, are not a legal prerequisite for the agreement’s validity. Thus, consent remains the key element that underpins the validity of a separation agreement in New York.