Life has a funny way of throwing curveballs, doesn’t it? So, what if you’ve already got a prenup, but things have changed, and now you want to tweak or even replace it? Or maybe you simply want to re-confirm what you already agreed to in the prenup! Enter the postnup (or prenuptial agreement amendment)! Yes, you can (usually) get a postnup or prenup amendment (depending on your state), even if you already have an existing prenup. Let’s break down what that means and how it works.
Prenup v. postnup: What’s the difference?
Think of prenups and postnups (yep, those are short for prenuptial and postnuptial agreements) as handy tools for keeping finances and other marital matters in check. They’re kind of like marital insurance for your relationship, but one’s for before you tie the knot, and the other is for during the marriage.
Similarities between prenups and postnups
- Purpose: Both are designed to define each spouse’s financial rights and responsibilities, covering what happens in case of divorce, separation, or death. (Sounds serious, but it’s really just smart planning!)
- Legal Requirements: Both require full financial transparency, must be written and signed by both parties willingly, and meet fairness standards to be enforceable.
- Content: They can cover similar topics—like who gets what property, who’s responsible for debts, and if alimony is on the table (also depending on your state).
- Benefits: With both, you get a clear picture of each other’s finances, which can prevent surprises down the line and build trust.
Differences between prenups and postnups:
- Timing: A prenup is signed before marriage and kicks in as soon as you say “I do.” A postnup, on the other hand, is signed once you’re already married and takes effect immediately. Sometimes, it can be applied retroactively, depending on your state and situation.
- Enforceability and legal scrutiny: Both are generally enforceable, but courts tend to look at postnups a little closer, just to make sure both parties agreed without pressure.
- Motivation: Postnups can address things that creep up after the wedding, like a big career shift, a new business venture, or other major life changes. Or maybe there are some relationship issues that make you want to revisit the terms.
Both prenuptial and postnuptial agreements serve valuable purposes in safeguarding the financial interests of married couples. Depending on your state law and the terms of your prenup, you may be able to amend or replace your prenup with a postnup.
Why would someone get a postnup if they already have a prenup?
Because life happens! Think of your prenup as a starting point. It’s legally binding, but a postnup allows you to update it as your relationship—and finances—evolve. Here are a few reasons you might consider a postnup:
- Change in financial status: Maybe you got a big promotion or unexpected windfall. A postnup can help adjust to new financial realities.
- Address new or changing assets or debts: Bought a house, started a business, or took on significant debt? Maybe you simply do not have the same bank accounts listed on your financial disclosure as you did when you signed the prenup. A postnup can clarify all of those new/updated assets and how to treat them.
- Changing family dynamics: Maybe you welcomed a child, or family dynamics shifted. A postnup can reflect those changes, such as providing for one person who wants to stay at home with the children.
- Change in career: If one spouse gives up a career to stay home or starts a new one, spousal support terms may need an update. Note: Not all states allow spousal support clauses in postnups, including California.
- Change in state laws: Sometimes, the law changes and affects your prenup. A postnup can help you stay current.
- Update distribution: Maybe you want to redistribute or reassign marital and separate properties, a postnup can help do that.
- Strengthening the marriage: For some couples, a postnup can actually bring peace of mind and show commitment.
Looking for some real-life examples of how postnups look in real life? We break down some common scenarios below:
- Rachel and Sam married right out of college, both working full-time. A few years later, Rachel decided to forgo her career to be a stay-at-home mom. They created a postnup to agree on financial support and asset division in case of a split, reflecting the fact that Sam would be supporting them financially while Rachel took care of the kids.
- After a few years of marriage, Jake inherited a family cabin that had been in his family for generations. To make sure this sentimental property stays in his family tree, Jake and his wife, Emily, drafted a postnup to ensure the cabin wouldn’t be subject to division if they ever divorced.
- When they first married, Erin and Sofia were both starting out in their careers. Years later, Erin’s business took off, becoming a major source of family income. They decided to create a postnup to protect the business in case of a divorce, so Erin could continue to run it without disruption while ensuring Sofia’s financial security was protected too.
No matter the reasons for wanting to revisit your prenup or start over entirely, there are certainly many benefits to creating a postnup!
So, what happens to your prenup?
It depends on what you want to do! If your prenup’s terms can be amended, a postnup can either:
- Amend the existing prenup: Keep the basics but make adjustments. This typically involves adding an addendum to the original agreement with the relevant changes.
- Ratify the existing prenup: This means just confirming everything in the original agreement is still the same and you both are just “reaffirming” (or “ratifying”) the terms of the prenup.
- Replace the prenup entirely: Start fresh with a whole new agreement. This is known as “revocation” in the legal world.
Important: While technically not required in many states, making sure both you and your spouse have legal representation can help ensure that both parties’ interests are fairly represented and you are drafting the document to meet your intentions.
How to create a valid postnup
Most states will enforce postnups that meet certain requirements, but courts can be stricter on postnups than prenups. To make sure yours holds up:
- It must be written and signed by both parties.
- Both spouses need to enter it knowingly and voluntarily.
- Full financial disclosure is required (no hiding assets).
- Some states require legal representation, notarization, and witnesses.
- The terms should be fair and reasonable, nothing unconscionable.
- Don’t include anything that would violate the law, or include unenforceable terms that impact child custody or child support.
The enforceability of postnups may vary depending on state laws as some jurisdictions may have more specific requirements. So it’s important to understand your state laws and speak with an attorney during the process to ensure you are dotting your I’s and crossing your T’s!
Do I need an attorney to do this?
While some states do not formally require legal representation, it’s usually a good idea to have a lawyer help you draft a postnup. As postnups can be slightly shaky in the eyes of the law in some states, having a lawyer really shows that the agreement was drafted with careful consideration. Consulting with a lawyer will also help make sure your postnup is legally sound and protects both parties!
Takeaway
At the end of the day, prenups and postnups aren’t about predicting the worst—they’re about planning for peace of mind. Life changes, and so can your agreements. A postnup lets you and your spouse adjust your financial plans to match your current reality, whether it’s a new business venture, a shift in family responsibilities, or simply a desire to update your financial goals together.
So, if life has thrown some changes your way, know that a postnup could be a practical, caring way to adapt. Or maybe you just want to reconfirm your prenup–after all, it’s been several years since you signed the agreement. Whatever your situation, remember to consult with an attorney, keep things fair, and treat this as another step toward a secure, harmonious future together.

Jess Perillo is a legal intern at HelloPrenup, and is currently a third-year student at Suffolk University Law School. She is an Article Editor on Suffolk Law Review, and is especially interested in legal research and writing. Jess is passionate about exploring the ways technology can help close the justice gap and make legal services more accessible.


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