Postnuptial Agreement Lawyer in Phoenix, AZ
A postnuptial agreement lawyer in Phoenix drafts a written Arizona agreement, signed during your marriage, that sets which property is separate, which is shared, and how both would be divided if the marriage ends. Since September 12, 2026, Arizona postnups follow their own statute, A.R.S. 25-202.01.
Maybe you started a business, received an inheritance, or moved to Arizona and never signed a prenup. Francisca F. Manchac has helped couples and families for more than 18 years, and she has litigated her own prenuptial agreement, so she drafts every marital agreement with a future challenge in mind. Each postnup is built around full financial disclosure and a flat fee set before work begins. Call (832) 263-0935 to schedule a free consultation.
Francisca F. Manchac | Licensed in Arizona and Texas | Last Updated: October 2026

Key Takeaways
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Arizona postnups must be in writing and signed by both spouses, and they take effect as soon as both have signed.
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In Arizona, rents and profits from separate property stay separate by default, while wages either spouse earns during the marriage are community property.
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An Arizona postnup can set property rights, spousal maintenance terms, and who receives a life insurance death benefit, but it can't reduce a child's right to support.
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Arizona courts divide community property at divorce without looking at marital misconduct, so the terms you sign matter more than who was at fault.
Who Needs a Postnuptial Agreement in Phoenix?
You need a postnuptial agreement if you're already married and want something other than Arizona's community property rules to decide what's yours.
That includes Phoenix spouses who started or grew a business, received an inheritance, moved to Arizona from another state, or simply never signed a prenup. It also fits couples who signed a postnup before the 2026 law and want an agreement built under the new statute. Each one is drafted under Arizona law as part of the firm's prenuptial, postnuptial, and cohabitation agreement services. The firm drafts, negotiates, and reviews agreements. It does not handle divorce, legal separation, or any court case, including a challenge to a postnup, and it refers that work to trusted colleagues.
Common Situations Handled
Most Phoenix couples call after a change makes the question of what's yours feel real.
Starting or Growing a Business
A business you own before marriage stays separate, but the work you put into it during the marriage can give your spouse a claim to part of its growth. A postnup sets those terms in writing. Many owners pair it with business formation work.
Receiving an Inheritance
An inheritance is your separate property under Arizona law. Mixing it into a joint account or using it on a shared home can blur that line, and a postnup can confirm what stays yours.
Skipping the Prenup
Many couples meant to sign a prenuptial agreement and ran out of time before the wedding. A postnup can cover nearly the same ground now that you're married.
Moving to Arizona
At divorce, Arizona treats property either spouse acquired in another state as community property if it would have been community property here. A postnup can set different terms.
Children From a Prior Relationship
A postnup can keep certain property separate so it can pass to your children. It works best alongside a revocable living trust that carries out the same plan.
An Older Postnup
Postnups signed before September 12, 2026 were judged under older court decisions. A prenup and postnup review shows whether a new agreement makes sense.
Why Hiring a Postnuptial Agreement Attorney Matters
Arizona now asks whether a postnup is fair and equitable, and a one-sided agreement is easy to attack. The way the agreement is drafted, disclosed, and signed decides whether it holds up years later.
What Goes Wrong Alone
Form postnups often skip disclosure schedules, use vague property terms, or let one spouse sign without understanding the rights they're giving up.
What Experience Adds
An attorney drafts to the four grounds in Arizona's statute, documents full disclosure, and builds a record showing both spouses signed freely.
How Outcomes Differ
A sound postnup settles property questions quietly if the marriage ends. A weak one can turn a divorce into a costly fight over the agreement itself.
“
Francisca really listened and helped me to understand what I needed to include in my prenup. I really appreciated being able to text the office when I had a question.
Christine · Marital agreement client
Who Is Involved?
A postnup is a negotiated agreement, and each person has a clear role. Here's who does what.
You
Share your goals and a full list of your assets, debts, and income.
Your Spouse
Shares the same information and decides what terms they accept.
Your Attorney
Francisca represents one spouse, drafts the agreement, and explains every clause.
Your Spouse's Attorney
Reviews the draft for your spouse and negotiates any changes.
Your CPA or Financial Advisor
Helps value a business or accounts for the disclosure schedules.
What Your Postnuptial Agreement Includes
Your engagement produces a signed Arizona postnup with clear property terms and full disclosure attached. You also gain something harder to measure: both spouses know where they stand, so money stops being a source of worry.
What You Receive
- Arizona Postnuptial Agreement: A written agreement drafted under A.R.S. 25-202.01, covering property, debts, and any spousal maintenance terms.
- Financial Disclosure Schedules: Lists of each spouse's assets, debts, and income, attached to the agreement.
- Separate Property Terms: Clear rules for a business, an inheritance, a home, or accounts owned before marriage.
- Estate Plan Coordination: Guidance on matching your will, trust, and beneficiary forms to the agreement.
What You Avoid
- Default Division: Community property rules deciding who keeps your business or savings.
- A Fairness Challenge: An agreement attacked because it wasn't fair and equitable or lacked disclosure.
- Mixed Property Disputes: Arguments over whether an inheritance or business growth became community property.
- Uncertainty About an Old Agreement: Wondering how a court would treat a postnup signed before 2026.
Are Postnuptial Agreements Enforceable in Arizona?
Yes. Arizona postnups are enforceable when they meet the 2026 statute, and the spouse challenging one carries a heavy burden. These three rules matter most for Phoenix couples.
Sept. 12, 2026: Arizona's First Postnup Statute
House Bill 2861 added A.R.S. 25-202.01, which took effect on September 12, 2026. It defines a postnup as an agreement made during marriage to divide or delineate one or both spouses' property interests. The agreement must be in writing, signed by both spouses, and takes effect when both sign. The law doesn't say whether it reaches agreements signed earlier.
4 Grounds: When an Arizona Postnup Fails
A postnup can't be enforced if the challenging spouse proves it carries any taint of fraud, coercion, or undue influence, that they signed without full knowledge of the property and their rights, that it isn't fair and equitable, or that it doesn't reflect a mutual intent to divide or delineate property. The challenging spouse must prove it by clear and convincing evidence.
Fair and Equitable: A Higher Bar Than a Prenup
Under A.R.S. 25-202, a prenup fails only if it was signed involuntarily, or if it was unconscionable and the spouse also lacked fair disclosure. A postnup must instead be fair and equitable and signed with full knowledge. That makes complete disclosure schedules and independent counsel for each spouse far more important for a postnup.
How Do You Get a Postnuptial Agreement in Phoenix?
You get a postnup in five steps, from a free video consultation to a signed agreement, with a flat fee set before work begins.
01
Free Consultation and Intake
Book a Prenuptial or Postnuptial consultation and complete the intake form at least 24 hours ahead. Francisca learns your goals and what changed.
02
Financial Disclosure
You and your spouse list your assets, debts, and income. Francisca turns them into schedules attached to the agreement.
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Drafting and Plain-Language Review
Francisca drafts the agreement and walks you through every clause by video. You can text the office with questions.
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Your Spouse's Attorney Review
Your spouse's own attorney reviews the draft, and Francisca negotiates any changes with them.
05
Signing and Follow-Through
Francisca coordinates the signing. She then explains any follow-up, such as updating your will, trust, or beneficiary forms to match.
Common Questions About Postnuptial Agreements in Phoenix
Something else on your mind? Call or text (832) 263-0935.
How much does a postnup cost in Phoenix?
Francisca drafts postnuptial agreements for a flat fee, so you know the full cost before work begins and never pay by the hour for questions or revisions within the scope you agree on. The fee depends on how much your agreement needs to cover, such as a business, real estate, an inheritance, or spousal maintenance terms. Your spouse pays their own attorney for an independent review, which is a separate cost but makes the agreement much harder to challenge later. Your first step is a free 30-minute virtual consultation, where Francisca reviews your goals and quotes your flat fee.
Can you do a postnuptial agreement without a lawyer?
Arizona doesn't require a lawyer, but a do-it-yourself postnup is risky under the 2026 statute. A court can refuse to enforce a postnup that isn't fair and equitable, or that a spouse signed without full knowledge of the property and their rights. Online forms rarely include disclosure schedules, and they don't create a record that each spouse understood the terms. Most of the protection comes from how the agreement is prepared, not just the words on the page. Having each spouse represented by their own attorney is the strongest answer to a later claim of pressure or unfairness.
What is a postnuptial agreement in Arizona?
Arizona law defines a postnuptial agreement as an agreement entered into during marriage to divide or delineate one or both spouses' property interests. In plain terms, it's a written contract between spouses that says which property is separate, which is community, and how property and debts would be divided if the marriage ends or one spouse dies. It can also address spousal maintenance, a life insurance death benefit, and the wills or trusts that carry out the plan. Without one, Arizona's community property laws decide those questions for you.
What's the difference between a prenup and a postnup?
Timing comes first. A prenuptial agreement is signed before the wedding and takes effect at marriage. A postnup is signed after you're married and takes effect when both spouses sign. In Arizona, the enforcement tests also differ. A prenup is judged under A.R.S. 25-202, while a postnup is judged under the newer A.R.S. 25-202.01, which asks whether the agreement is fair and equitable. Both can cover property, debts, and spousal maintenance, and neither can reduce a child's right to support.
Is a postnup as good as a prenup in Arizona?
A postnup can be just as effective, but it has to clear a different bar. Arizona prenups are hard to undo unless a spouse signed involuntarily or the agreement was unconscionable with poor disclosure. A postnup must be fair and equitable and signed with full knowledge of the property and rights involved. The 2026 statute does help postnups in one way: the challenging spouse must prove a problem by clear and convincing evidence. With full disclosure and separate attorneys, a well-drafted postnup gives you strong protection.
Can a postnup cover spousal maintenance in Arizona?
Yes. Arizona law lets spouses use a marital agreement to modify or eliminate spousal maintenance, which is Arizona's term for alimony. A postnup can set an amount, a time limit, or conditions that trigger support. Because Arizona postnups must be fair and equitable, a full waiver needs extra care, especially when one spouse earns much less or has stepped back from a career to raise children. Francisca drafts maintenance terms that fit your family and explains how a court might view them.
Can a postnup decide custody or child support?
No. Under A.R.S. 25-203, a marital agreement can't adversely affect a child's right to support. Arizona courts decide legal decision-making and parenting time based on the child's best interests when the question comes up, not on terms parents agreed to years earlier. A postnup can still address how the spouses handle property they hold for the children, such as college savings, and it can sit alongside an estate plan that names guardians and sets up trusts for your kids. A court won't enforce a clause that tries to limit it.
We signed a postnup before September 2026. Do we need a new one?
Not necessarily, but it's worth a review. The 2026 law doesn't say whether it applies to agreements signed before it took effect, so an older postnup may still be judged under the earlier court decisions. Many couples choose to sign a new agreement under A.R.S. 25-202.01 to get its clearer rules and the higher burden on a challenging spouse. Arizona lets spouses amend or revoke a marital agreement only in a written agreement both sign. A prenup and postnup review shows what your current agreement does and whether an update makes sense.
Is my spouse entitled to half my savings if we divorce?
Often, yes, without an agreement. Wages either spouse earns during an Arizona marriage are community property, so savings built from those wages usually belong to both of you. Arizona courts divide community property equitably at divorce, which usually means about equally. Money you owned before marriage, or received by gift or inheritance, stays your separate property if you can trace it and keep it apart. A postnup can change these defaults, for example by agreeing that each spouse's future earnings and savings stay separate.
Can we change or cancel a postnup later?
Yes. Arizona law lets spouses amend or revoke a postnuptial agreement after marriage, but only by a new written agreement that both of you sign. A spoken promise or an email exchange won't change it. Many couples revisit their postnup after a major change, such as selling a business, receiving an inheritance, or having children. If you update the agreement, the same rules apply: full disclosure, a fair result, and time for each spouse to review it with their own attorney before signing.
Areas We Serve
The Law Offices of Francisca Manchac, PLLC serves couples across Maricopa and Pinal Counties, and throughout Arizona, with consultations and document reviews by video, so you and your spouse can meet from home. Arizona's marital agreement rules apply the same way statewide. Visit the Phoenix office page to see every service available to Arizona clients.
Maricopa County
Pinal County
All of Arizona

Other Marital Agreement Services We Offer
Get Started With a Postnuptial Agreement Attorney in Phoenix
A postnup is easiest to negotiate during a calm season in your marriage, not after a crisis. Start with a free 30-minute virtual consultation with Francisca. Call (832) 263-0935 or book online.
