Do Prenups Expire? Understanding Sunset Clauses

Published on: 3 Apr 2025

When couples create a prenuptial agreement, one of the most common questions that comes up is: do prenups expire? The short answer is not automatically—but they can if they include something called a sunset clause.

As prenups become more common, especially among Millennials and Gen Z, many couples are opting to include flexible terms that reflect the evolution of their relationship. A sunset clause is one of the most powerful tools for doing just that. But how does it work? And should you include one in your prenup?

Let’s break it down.

What Is a Sunset Clause in a Prenup?

A sunset clause is a provision in a prenuptial agreement that sets an expiration date for the agreement or specific parts of it. Think of it as a timer—once that time runs out, the prenup (or selected clauses) no longer apply.

For example:

• A prenup might state that it will expire after 10 years of marriage.
• Another might say that spousal support waivers will only apply for the first 5 years.
• Or, it could be structured to phase out over time, offering less protection the longer the marriage lasts.

Sunset clauses are completely optional but can be a helpful way to build flexibility and fairness into a prenup.

Do Prenups Expire Automatically?

No. A prenuptial agreement does not expire on its own unless it specifically includes a sunset clause. Once signed and executed properly, a prenup remains legally valid and enforceable unless:

• It is revoked or replaced by a new agreement (like a postnup)
• It’s invalidated by the court due to fraud, coercion, or unfair terms
• It includes a sunset clause that triggers expiration

So, if your prenup doesn’t include a sunset clause, it stays in effect indefinitely.

Why Some Couples Choose a Sunset Clause

1. To Reassure a Hesitant Partner

Some people are uncomfortable with the idea of a prenup lasting forever. A sunset clause offers a compromise: it provides protection early in the marriage, but eventually dissolves as the relationship proves its strength.

2. To Account for Changing Circumstances

The financial dynamics between spouses can change significantly over time. A sunset clause reflects that the need for a prenup may diminish as:

• Assets become joint
• Children are born
• Trust deepens between partners

3. To Align with Emotional Milestones

Some couples choose to let their prenup expire after:

• A milestone anniversary (like 10 or 20 years)
• The birth of their first child
• Retirement or another major life event

This can feel more natural than having the prenup last forever.

Risks of a Sunset Clause

While sunset clauses offer flexibility, they also come with potential downsides:

⚠️ Loss of Protection Over Time

If your prenup expires after 10 years, and you divorce in year 11, all the protections you put in place may be gone—leaving you subject to default state laws.

⚠️ Uncertainty in Divorce

Sunset clauses can create confusion if not clearly worded. If a clause is vague, it may lead to disputes about whether the prenup still applies.

⚠️ Assumptions About the Future

A clause that seems fair today may not reflect future reality. For example, if one spouse sacrifices their career to raise children, and the prenup expires at year 10, they may lose access to spousal support they actually need.

How to Structure a Sunset Clause

If you choose to include a sunset clause in your prenup, clarity is key. Here are a few ways it can be structured:

• Fixed Expiration Date: "This agreement will expire on the couple’s 10th wedding anniversary."
• Conditional Expiration: "This agreement will terminate upon the birth of a child or after 15 years, whichever comes first."
• Partial Sunset Clause: "Only the spousal support waiver will expire after 7 years; the asset division terms will remain."

Working with a platform like prenups.ai helps ensure these clauses are written clearly and comply with your state’s laws.

Are Sunset Clauses Enforceable?

Generally, yes—courts across the U.S. uphold sunset clauses as long as the overall prenup is valid. However, the specific enforceability can vary depending on your state. For example:

• California, Florida, Texas, and New York all allow sunset clauses, provided the terms are clear and the agreement meets basic legal standards.
• States like Massachusetts or New Jersey may scrutinize them more heavily, especially if they result in unfair outcomes.

That’s why it’s essential to follow proper legal formalities and use tools that are compliant with your state laws.

Do You Need a Sunset Clause in Your Prenup?

Not necessarily—but it depends on your relationship, values, and goals.

You might want a sunset clause if:

• One partner is hesitant about the prenup
• You want protection early in the marriage but not forever
• You expect financial roles to evolve over time

You might skip it if:

• You want permanent protection for business or family assets
• You’re concerned about divorce years—or decades—down the line
• You prefer stability over flexibility

How prenups.ai Helps You Decide

At prenups.ai, we give couples the power to build prenuptial agreements that are:

• ✅ Customized to your relationship
• ✅ Legally sound in your state
• ✅ Easy to understand and update
• ✅ Built with optional sunset clause support

We help you explore whether a sunset clause fits your needs—and guide you step-by-step through creating a prenup that works for both of you.

Final Thoughts

Prenups don’t expire automatically, but they can if you include a sunset clause. For some couples, this flexibility is a perfect way to balance protection and partnership. For others, a long-term agreement offers more peace of mind.

Either way, the key is to make sure your prenup reflects your values and future plans—and that it’s legally valid in your state.

📌 Ready to start building your prenup—with or without a sunset clause? Create yours today with prenups.ai and move forward with clarity and confidence.