Postnuptial Agreements in Pennsylvania: Are They Enforceable?

Most people have heard of a prenuptial agreement, signed before the wedding. Fewer know that a married couple can sign a similar agreement after they are already married. It is called a postnuptial agreement, and in Pennsylvania it is a valid, enforceable contract. What makes one hold up, and what makes one fall apart, comes down to how it was made.

What a postnuptial agreement is

A postnuptial agreement is a contract between spouses, entered into during the marriage, that sets out how property, debts, support, and other financial matters will be handled, typically in the event of a divorce or death. It can define what counts as separate property, waive or set the terms of alimony, allocate specific assets, and resolve questions that would otherwise be left to a court dividing the marital estate later.

The difference from a prenuptial agreement is only timing. A prenup is signed before the marriage, in contemplation of it. A postnup is signed after the marriage has already begun. The purpose is the same: to replace the default rules of equitable distribution with terms the couple chooses for themselves.

Are they enforceable in Pennsylvania?

Yes. Pennsylvania courts enforce postnuptial agreements, and they are treated as binding contracts. A court resolving a divorce will give effect to a valid postnuptial agreement and divide property according to its terms rather than applying the statutory equitable distribution factors. The agreement controls, if it was properly made.

That last clause is the whole game. A postnuptial agreement is only as strong as the process behind it. Pennsylvania law treats marital agreements as contracts, which means they can be challenged and set aside for the same reasons any contract can: fraud, misrepresentation, or duress. But there is an additional layer that makes marital agreements different from an ordinary business contract.

The disclosure requirement is what makes or breaks it

Spouses do not deal with each other at arm's length the way two strangers negotiating a deal do. They stand in a relationship of mutual confidence and trust. Because of that relationship, Pennsylvania law requires full and fair disclosure of each spouse's financial position before a marital agreement is signed. Each spouse has to know what the other actually has before agreeing to give up rights to it.

This is the most common ground on which these agreements are attacked. If one spouse hid assets, understated income, or never disclosed a business interest or account, the spouse who signed without that knowledge can argue the agreement should not stand. The premarital agreement statute, 23 Pa.C.S. § 3106, frames the benchmark for marital agreements generally: an agreement can be set aside if the challenging party proves they did not sign voluntarily, or that they were not given fair and reasonable disclosure of the other party's property and obligations, did not waive that disclosure in writing, and did not otherwise have adequate knowledge of it. A postnuptial agreement built on full, honest, documented disclosure is far harder to challenge than one signed in the dark.

What makes a postnuptial agreement hold up

The agreements that survive a challenge tend to share the same features. They are the practical answer to how to do this right:

• Full written financial disclosure by both spouses, attached to or referenced in the agreement, so there is a record of what each side knew
• Each spouse represented by their own independent attorney, or a knowing written waiver of that right
• Adequate time to review, rather than a signature demanded under pressure on short notice
• Clear, complete terms, with no central provision left undefined
• Voluntary execution, free of coercion or threat
• Proper signing formalities, typically signed and notarized

None of these is a magic word. Together they build the record that shows the agreement was entered knowingly and fairly, which is exactly what a court looks for when one spouse later tries to escape it.

When a married couple should consider one

Postnuptial agreements come up in a handful of recurring situations. A couple that meant to sign a prenup before the wedding but ran out of time. A spouse who starts or inherits a business during the marriage and wants to define how it would be treated. A reconciliation after a separation, where the couple wants to set terms before deciding to stay together. A significant change in finances, an inheritance, a windfall, a large debt, that the couple wants to address directly rather than leave to a future court. In each case, the postnup replaces uncertainty with a known framework.

It is worth being honest about one thing: a postnuptial agreement is most useful when it is signed in good faith by a couple intending to stay married, not as a tactical maneuver on the eve of a divorce. An agreement that looks like it was extracted from a vulnerable spouse at the breaking point of a marriage invites exactly the voluntariness and disclosure challenges that get agreements thrown out.

Having one reviewed before you sign

If a postnuptial agreement has been put in front of you, the worst move is to sign it because it was handed to you. The terms are negotiable, the disclosure should be complete, and you are entitled to understand precisely what rights you are giving up before you give them up. Having the agreement reviewed by your own attorney before signing is not an obstacle to the process. It is what makes the resulting agreement stronger and harder to unwind later, which protects both spouses.