To get a postnuptial agreement, you and your spouse each gather complete financial records, hire your own attorneys, negotiate the terms, and sign a written contract that meets your state’s enforceability rules. Expect the process to take about four to six weeks and to cost somewhere between $1,000 and $10,000 or more per spouse, depending on how complicated your finances are. A handful of states still do not enforce these agreements and the rules differ among those that do, so confirm what your state requires before you spend money on drafting.
Step 1: Pull Together Every Financial Record
Nothing else in the process works if the financial picture is incomplete. Each spouse needs to document everything they own and everything they owe, then sort each item into separate property (owned before the marriage, or received individually by gift or inheritance) and marital property (acquired during the marriage). That breakdown becomes a schedule of assets and liabilities attached to the final agreement.
On the asset side, collect recent statements for every checking, savings, and money market account; deeds, current appraisals, and mortgage statements for real estate; brokerage statements and any stock or bond holdings; recent benefit statements for 401(k)s, IRAs, pensions, and other employer-sponsored plans; ownership documents and recent financials for any business interests, with professional valuations if available; and records for digital and intellectual property such as cryptocurrency wallets, domain names, patents, trademarks, and revenue-generating online platforms.
For liabilities, pull current balances on mortgages, car loans, student loans, credit cards, and any outstanding tax obligations.
Completeness is not a formality. Under the model law many states follow, each spouse must give the other a reasonably accurate description and good-faith estimate of property, debts, and income.1Uniform Law Commission. Uniform Premarital and Marital Agreements Act Missing even one account gives the other spouse grounds to argue later that you hid information, and hidden assets are the most common reason postnuptial agreements get thrown out.
Step 2: Each Spouse Hires Their Own Attorney
Not every state requires both spouses to have independent counsel, but having separate lawyers dramatically improves the agreement’s chances of surviving a challenge. Separate representation shows that each spouse understood the rights they were giving up and that neither was pressured into signing. Some states treat the absence of independent counsel as a factor that weighs heavily against enforcement.
One spouse’s attorney drafts; the other spouse’s attorney reviews, questions, and negotiates revisions. Each attorney also reviews the other side’s financial disclosure before anyone signs.
Step 3: Negotiate the Terms
The negotiation covers how assets and debts are classified, what happens to specific property if the marriage ends, and whether either spouse waives rights such as spousal support or an elective share of the other’s estate. Both spouses should walk away with something meaningful. A judge can refuse to enforce an agreement whose terms are so one-sided they shock the conscience, and courts evaluate fairness both at the time of signing and at the time enforcement is sought.
Some topics cannot go into a postnuptial agreement no matter what both spouses want:
- Child custody and parenting time, which courts decide based on the child’s best interests at the time of separation.
- Child support, which is determined by the child’s needs and the parents’ finances at the time of divorce. You cannot set or waive it in advance.
- Provisions that effectively reward one spouse for filing for divorce, which may be struck down as against public policy.
- Lifestyle or personal-behavior clauses covering chores, appearance, religion, friendships, or hobbies.
- Anything illegal.
Spousal support waivers sit in a gray area. Some states allow them in a postnuptial agreement, but many impose strict requirements, and a court may still override a waiver if enforcement would leave one spouse unable to support themselves. An inheritance waiver is possible in most states but must be spelled out in specific language, in writing, with adequate financial disclosure, and in some states witnessed or notarized.
If the agreement involves transferring property between you now or later, ask your attorney about the tax consequences before you commit. Transfers between spouses are generally not taxed when they happen, but the receiving spouse takes over the other’s original cost basis, which can create a significant capital gains bill down the road.2Office of the Law Revision Counsel. 26 USC 1041 – Transfers of Property Between Spouses or Incident to Divorce
Step 4: Sign the Agreement the Right Way
Under the model act, a marital agreement must be in writing and signed by both spouses, voluntarily.1Uniform Law Commission. Uniform Premarital and Marital Agreements Act Oral promises are not enforceable, and any agreement obtained through threats, intimidation, or extreme pressure will be set aside if challenged. Courts look especially closely at postnuptial agreements because one spouse may have more leverage inside an existing marriage than they would during an engagement.
Plan on signing in person with wet ink. Electronic signatures are generally not valid here, because federal law specifically excludes contracts governed by state family law from the e-signature provisions that cover most commercial transactions.3Office of the Law Revision Counsel. 15 USC 7003 – Specific Exceptions
Both spouses should be physically present. A notary public verifies each signer’s identity and notarizes the signatures. Some states also require one or two disinterested witnesses, meaning people who are not family members or beneficiaries under the agreement or a related will. Notary fees typically run from about $5 to $25 per signature.
Step 5: Store It and Consider Recording It
Keep the signed original in a secure place such as a fireproof safe or a bank safe deposit box. Each spouse and each attorney should hold a complete copy. If your state allows it, you can record the agreement with the county clerk’s office, which creates a public record and makes future enforcement or property transfers easier. Recording fees generally fall in the range of $25 to $90.
If the agreement waives inheritance rights, update both spouses’ wills and other estate planning documents so they line up with the new terms. A will that contradicts the postnuptial agreement is a recipe for expensive litigation after one spouse dies.
What It Costs and How Long It Takes
Attorney fees are by far the biggest expense. A straightforward postnuptial agreement with limited assets and few contested terms typically runs between $1,000 and $3,000 per spouse. Agreements that involve business interests, multiple properties, or extensive back-and-forth can reach $10,000 or more per spouse. Each spouse normally pays their own attorney, though one spouse sometimes agrees to cover both sets of fees as part of the deal.
From the first attorney meeting to final signatures, four to six weeks is a realistic estimate when both spouses cooperate with disclosure and negotiations move at a reasonable pace. Disputes over specific terms, delays in gathering records, or the need for professional appraisals of real estate, businesses, or other hard-to-value assets can stretch things out considerably. Appraisal costs vary widely with the type and complexity of the property being valued.
Changing or Canceling It Later
A postnuptial agreement does not have to be permanent. New children, a career change, a large inheritance, or just the passage of time can make the original terms feel outdated. You have three main options:
- Amend the agreement. Both spouses negotiate updated terms and sign a formal written amendment, following the same procedures used for the original.
- Revoke it entirely. Both spouses sign a written revocation stating their intent to cancel the agreement. One spouse cannot revoke on their own; it takes mutual consent.
- Build in a sunset clause from the start. The agreement can automatically terminate on a set date or event, such as a particular wedding anniversary, or specific provisions can phase out over time. A sunset clause typically does not take effect if a divorce has already been filed.
Any change should follow the same formalities as the original: written, signed by both spouses, and reviewed by each spouse’s own attorney. An email or a verbal understanding to ignore the agreement will not hold up in court.