April 24, 2026
The word “prenup” comes with a lot of preconceived notions for many people. For some, they bring to mind celebrity marriages; others think they’re reserved for high-asset marriages, and others still view prenuptial agreements as dooming a marriage from the beginning.
In reality, prenuptial and postnuptial agreements are planning tools for couples. They are about clarity, transparency, and reducing uncertainty, and they’re definitely not about predicting failure or divorce.
In Oregon, the legal framework for these agreements matters, since prenuptial agreements (prenups) are governed by a specific statute, whereas postnuptial agreements (postnups) are not. That distinction affects how courts analyze enforceability.
If you are considering either option, understanding the differences under Oregon law is essential.
In this article, we’ll break down the legal framework of prenups and postnups in Oregon, help you understand how you can decide which one is right for you, along with common mistakes to avoid, and asset protection in marriage.
Key Takeaways:
Prenups and postnups are planning tools, not predictions of divorce.
Prenups are governed by Oregon statute (ORS 108.700–108.740).
Postnups are evaluated under general contract law and case law principles.
Postnups often face greater court scrutiny because spouses owe each other fiduciary duties during marriage.
Full financial disclosure and voluntary agreement are critical to enforceability for both types of agreements.
The right choice often depends on timing.
Before we dive in, it’s important to understand marriage contracts in the eyes of the law in Oregon.
In simple terms, the difference comes down to timing:
A premarital agreement (prenup) is signed before marriage and takes effect once the couple marries
A postnuptial agreement (postnup) is created and signed after the couple is already married.
While that timing difference may sound simple, it has significant legal implications under Oregon law. Prenups are governed by a specific statute, while postnups are evaluated under general contract law and case law principles.
A prenuptial agreement is a contract signed between spouses before marriage that becomes effective upon marriage. It can include things like management and control of property, how property will be divided upon separation, divorce, or death, spousal support, and estate planning matters (including wills and trusts). A prenup cannot limit or waive child support. Oregon has adopted the Uniform Premarital Agreement Act, codified in ORS 108.700–108.740.
Under Oregon law, a valid prenup must:Be in writing
Be signed by both parties
Be executed before marriage
Become effective upon marriage
No separate “consideration” is required. The marriage itself is enough. Once married, a prenup can only be amended or revoked by a signed written agreement.
A postnuptial agreement is signed after marriage. Oregon does not have a single “Postnuptial Agreement Act.” Instead, enforceability depends on:
General contract principles
Family law statutes governing dissolution and settlement
Case law addressing fiduciary duties between spouses
That difference is significant. When spouses negotiate after marriage, courts often view the relationship as confidential or fiduciary in nature. That can increase scrutiny, especially if one spouse has greater financial knowledge or control.
Types of Postnuptial Agreements
In practice, Oregon postnups typically fall into one of three categories:
Ongoing-marriage property agreements (clarifying separate vs. marital property)
Agreements made in contemplation of separation or divorce
Estate-planning agreements, including elective share waivers
Each category may be analyzed differently by a court.
Whether created before or after marriage, marital agreements are practical planning tools. They can help couples clarify financial expectations and avoid misunderstandings later.
Well-drafted agreements can:Define what property will remain separate versus marital
Clarify responsibility for existing or future debt
Protect inheritances or family assets
Address spousal support expectations
Establish financial rules if the marriage ends due to divorce or death
When you define financial expectations early, you can avoid costly disputes later on.
The clearest distinction between prenups and postnups in Oregon is this:
Prenups are governed by a defined statutory framework.
Postnups are shaped largely by case law emphasizing fairness and full disclosure.
That does not mean postnups are unenforceable, but it does mean courts often look more closely at how they were negotiated.
Although they are evaluated differently under Oregon law, premarital and postnuptial agreements share several important characteristics.
Both requirements require:
Full Financial Disclosure: Each spouse must have a clear understanding of the other’s financial situation.
Voluntary Agreement: The contract must be entered into freely and without coercion.
Careful Drafting: Ambiguous or poorly written agreements are more likely to face challenges in court.
Finally, independent legal advice, while not strictly required, is strongly recommended. Separate legal counsel for each spouse significantly strengthens the enforceability of the agreement. The process surrounding the agreement can be just as important as the document itself.
In Oregon, both prenups and postnups can be enforceable, but they are evaluated differently.
A prenup is governed by a specific statute (ORS 108.700–108.740), which provides a defined framework for enforcement. A postnup does not have its own standalone statute. Instead, courts apply general contract principles, divorce-settlement rules, and case law recognizing that spouses may owe each other heightened duties of fairness and disclosure during marriage.
For prenups, enforceability usually turns on two questions:
Was the agreement signed voluntarily?
And was it unconscionable when executed?
Voluntariness often depends on timing, pressure, surprise, and whether each party had a meaningful opportunity to seek independent legal advice. Unconscionability is closely tied to financial disclosure. There must be fair and reasonable disclosure, a valid written waiver of disclosure, or adequate knowledge of the other party’s finances.
For postnups, courts often scrutinize the process more closely because the parties are already married. If one spouse controls the finances or there is a significant imbalance in knowledge or power, the court may expect full and frank disclosure and clear evidence of fair dealing. Independent counsel is not strictly required for either type of agreement, but it can be especially important in postnups to demonstrate that the agreement was negotiated at arm’s length.
In short, prenups are tested primarily against a defined statutory standard, while postnups are more likely to be tested against the realities of the marital relationship and whether the agreement reflects genuine fairness and informed consent.
Choosing between a prenuptial agreement and a postnuptial agreement is often less about preference and more about timing and circumstances. The most important question is not which agreement is “stronger,” but when the planning happens and what you are trying to accomplish.
A prenup usually makes the most sense when you are not yet married and want clarity before your financial lives become legally intertwined. Because Oregon provides a defined statutory framework for premarital agreements, prenups often offer a cleaner structure for allocating property rights, addressing spousal support, and integrating estate planning before the marriage begins.
A postnup can make sense when circumstances change after marriage. Business growth, inheritance, debt restructuring, or reconciliation after a period of separation may prompt a need to redefine expectations. Postnups can also be an effective estate planning tool, particularly when spouses want to address inheritance rights or elective share issues after marriage.
Here’s a quick breakdown to help you evaluate which type of agreement may fit your situation:
|
Situation |
Prenup |
Postnup |
|
You are not yet married |
Establishes clear expectations before marriage |
N/A |
|
Significant premarital assets |
Protects business interests, investments, or property |
N/A |
|
Children from a prior relationship |
Clarifies inheritance and property intentions |
Can adjust estate planning during marriage |
|
Anticipated inheritance |
Defines treatment of inherited assets |
Addresses inheritance received after marriage |
|
Large income or wealth disparity |
Sets expectations early |
Rebalances expectations after financial shifts |
|
Business grows during marriage |
N/A |
Allocates ownership or protects future value |
|
Debt concerns |
Clarifies responsibility before marriage |
Addresses debt restructuring mid-marriage |
|
Estate planning updates |
Coordinates with premarital estate plan |
Waives elective share or aligns with updated wills/trusts |
|
Reconciliation after separation |
N/A |
Defines financial terms moving forward |
|
Divorce settlement discussions |
N/A |
Formalizes terms in contemplation of dissolution |
After drafting many prenuptial and postnuptial agreements here at Gevurtz Menashe, we’ve noticed common misconceptions among couples. None of the myths below should be reason for you to hesitate to draft an agreement.
“We don’t have enough money to need one.”
You don’t need to be wealthy for a marital agreement to be useful. Agreements can help protect modest assets, retirement accounts, future earnings, or even shield one spouse from the other’s debt.
“It means we’re planning for divorce.”
We prefer to think of marital agreements as a form of structured communication. Discussing finances openly before problems arise can actually strengthen a relationship.
“We keep our assets separate, so we don’t need one.”
In Oregon, the source of funds often matters more than whose name is on an account. Without an agreement, property can still become subject to division during divorce.
“Postnuptial agreements aren’t valid in Oregon.”
This is just not true. While Oregon does not have a specific statute governing postnups, and they receive close scrutiny, they can still be enforceable if they’re properly drafted and negotiated fairly with full disclosure.
“Buying insurance doesn’t mean you’re planning for disaster, and estate planning doesn’t mean you’re planning to die. In the same way, a marital agreement isn’t about planning for divorce. It’s about clarity and protection. When finances are clearly defined, couples often feel less anxiety and far more certainty about the future.”
Katie Goss, Family Law Attorney & Shareholder
Are prenuptial agreements enforceable in Oregon?
Yes. Prenuptial agreements are enforceable in Oregon if they comply with the Uniform Premarital Agreement Act (ORS 108.700–108.740). They must be in writing, signed by both parties, executed before marriage, and entered into voluntarily with appropriate financial disclosure.
Are postnuptial agreements valid in Oregon?
Yes, but they are evaluated differently. Oregon does not have a specific postnuptial statute. Courts analyze postnups under general contract law, family law principles, and case law, often applying heightened scrutiny because spouses owe each other fiduciary duties during marriage.
Can a prenup or postnup waive child support in Oregon?
No. Under Oregon law, agreements cannot limit or waive child support obligations. Courts retain authority to determine child support based on the best interests of the child.
Do both spouses need separate attorneys?
Independent legal counsel is not strictly required for enforceability. However, having separate attorneys significantly strengthens the agreement, especially for postnuptial agreements, because it helps demonstrate voluntariness, fairness, and informed consent.
When should you choose a prenup instead of a postnup?
A prenup is typically the cleaner option when planning happens before marriage, particularly if one or both parties have significant premarital assets, business interests, or children from prior relationships. A postnup is often appropriate when financial circumstances change after marriage, such as business growth, inheritance, debt restructuring, or reconciliation.
Is it too late to create an agreement after you are already married?
No. Many couples assume that once they are married, they have missed the opportunity to create a marital agreement. In reality, postnuptial agreements can be created at any point during the marriage. Couples often pursue them after receiving an inheritance, starting a business, restructuring debt, or reconciling after a period of separation.
Prenups and postnups are about setting expectations clearly and making sure you and your spouse are on the same page; they’re not about anticipating divorce. For some couples, that clarity provides reassurance, while for others it protects business interests, inheritances, and/or children from prior relationships.
Marriage is both emotional and financial. Addressing the financial side openly can often strengthen a relationship rather than weaken it by eliminating uncertainty and preventing disputes later.
