Postnuptial agreements are generally enforceable if the parties of the document adhere to all state laws regarding inheritance, child custody, visitation and monetary support if a divorce does occur. ... If any state laws are in violation within the postnuptial, the judge may throw out the entire document.

Can a postnuptial agreement be voided?

Voluntary – Both parties to a postnuptial agreement must have signed the agreement voluntarily and intentionally. Any indication that one spouse coerced or threatened the other into signing will make a postnuptial agreement null and void.

Are post nuptial agreements binding in UK?

Post-Nuptial Agreements are usually legally binding and the position has been strengthened since 2008 following a Privy Council judgement.