Prenup Guide: What a Prenuptial Agreement Can Do About Debt, Savings and a Business
Figures checked October 27, 2026 against primary sources
A prenuptial agreement is a contract two people sign before they marry that says how their money, property and debts will be handled during the marriage and if it ends. It sounds like a document for the wealthy, but the people it helps most are often ordinary couples where one partner brings student loans, credit card balances, a retirement account or a small business into the marriage. This guide covers what a prenup can and cannot do, what makes one hold up, the uniform laws most states built theirs on, and the question many couples ask first: will I have to pay my spouse's debt?
The Short Answer
- A prenup can decide money matters: who owns which property, how it is managed, how it is split at divorce or death, and, in most states, spousal support.
- It cannot cut child support, and a court does not have to follow its custody terms. Both uniform acts say so in plain words.
- To hold up, it must be in writing, signed by both of you, entered into voluntarily, and backed by honest financial disclosure. Many states also look at whether each side had a chance to hire their own lawyer, and some, like California, require it for certain terms.
- Debts from before the marriage generally stay with the person who took them on, but in community property states marital property can sometimes be reached to pay them, and joint or co-signed debts are always shared.
- Each partner should have their own attorney. State law varies a lot, and this guide is general information, not legal advice.
What a Prenup Can Cover
The model law most states started from, the Uniform Premarital Agreement Act (UPAA), approved by the Uniform Law Commission in 1983, lists the matters a couple can settle in a premarital agreement. Read through a money lens, they are:
- Ownership of property, whether either of you owns it now or acquires it later, and wherever it is located. This is how a couple keeps a pre-marriage house, investment account or business stake as one person's separate property.
- Control of property: the right to buy, sell, borrow against, mortgage or otherwise manage it.
- What happens to property at separation, divorce, death or any other event the couple names.
- Spousal support: changing it or giving it up. States are split on this point, and some limit or police such terms more closely (see California below).
- Wills and trusts needed to carry out the agreement, and who gets the death benefit of a life insurance policy.
- Which state's law will be used to read the agreement.
- Anything else that does not break public policy or a criminal law.
For couples where one or both bring debt, the useful clauses are usually about who repays which existing balances, whether new debt either of you takes on in your own name stays yours, and how a business's value and growth are treated. The 2012 update to the uniform act lists "responsibility for a liability" among the marital rights an agreement can change.
A prenup is not a substitute for estate planning. If the agreement says a business or account goes to your children from an earlier marriage, you still need a will, a trust or updated beneficiary forms that match it. See estate planning basics.
What a Prenup Cannot Do
Some limits apply no matter how carefully the agreement is written. Under the UPAA, "the right of a child to support may not be adversely affected" by a premarital agreement. The 2012 Uniform Premarital and Marital Agreements Act (UPMAA) goes further and makes these terms unenforceable:
- anything that hurts a child's right to support;
- anything that limits the remedies available to a victim of domestic violence;
- anything that changes the legal grounds for divorce or legal separation;
- anything that penalizes a spouse for filing for divorce or separation.
Custody and parenting time are treated differently again: the UPMAA says a term about custody, visitation or parenting "is not binding on the court." A judge decides those questions at the time, based on the child's situation then.
There is also a safety valve on spousal support. Under both acts, if giving up support would leave a spouse eligible for public assistance when the marriage ends, a court can order the other spouse to pay enough support to prevent that, even though the agreement waived it.
When a Prenup Holds Up in Court
States differ in the details, but the same handful of conditions come up again and again.
1. In writing and signed by both
Both uniform acts require the agreement to be written (the 2012 act says "in a record," which covers electronic documents) and signed by both parties. Neither requires the usual contract "consideration": the marriage itself is enough. Under the UPAA, the agreement takes effect when you marry.
2. Signed voluntarily
Under the UPAA, an agreement is unenforceable if the person challenging it proves they did not sign voluntarily. The UPMAA adds duress by name. Timing matters here: an agreement presented days before the wedding invites a claim of pressure. California, for example, now requires at least seven calendar days between the time a party first sees the final agreement and the time they sign it, for agreements signed on or after January 1, 2020.
3. Full and fair financial disclosure
This is where most money-related challenges land. The UPMAA treats disclosure as adequate if a party received "a reasonably accurate description and good-faith estimate of value of the property, liabilities, and income" of the other, signed a separate written waiver of more disclosure, or already had adequate knowledge. Note that liabilities are on that list: hiding a debt can undo the agreement just as hiding an asset can.
The older UPAA is harder to challenge. A party has to prove the agreement was unconscionable when signed and that they got no fair disclosure, did not waive it in writing, and had no adequate knowledge of the other's finances. All of those must be true.
4. Independent lawyers
Separate lawyers for each partner are the norm, and in some places a legal requirement. Under the UPMAA, an agreement is unenforceable if a party lacked access to independent legal representation, which means a reasonable time to find and consult a lawyer and, if the other side has one, the money to hire one or an offer from the other party to pay. If a party signs without a lawyer, the agreement must include either a conspicuous notice of the rights being given up or a plain-language explanation of them. The model notice warns that the signer may be "agreeing to pay bills and debts" of the other person.
California is stricter. Its Family Code makes a spousal support clause unenforceable if the person it is used against did not have independent counsel when signing, and it presumes an agreement was not voluntary unless that person had counsel or waived it in a separate writing after being advised at least seven days before signing.
5. Not unconscionable
Unconscionable means so one-sided that a court will not enforce it. Under both acts, the court decides that question as a matter of law. The UPAA tests fairness at the moment of signing. The UPMAA lets each state choose whether to also allow a court to refuse a term that would cause "substantial hardship" because circumstances changed a lot after signing.
The Uniform Acts and Which States Adopted Them
A uniform act is a model law written by the Uniform Law Commission; it has force only in states whose legislatures pass it, often with their own changes. The commission's 2012 notes say about half of the states that adopted the 1983 act made significant amendments. States that never adopted either act still enforce prenups under their own statutes and court decisions, with their own rules.
According to the Uniform Law Commission's enactment table (data as of October 26, 2026):
| Act | Jurisdictions |
|---|---|
| Uniform Premarital Agreement Act (1983) | Arizona, Arkansas, California, Connecticut, Delaware, District of Columbia, Florida, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Maine, Montana, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, North Dakota, Oregon, Rhode Island, South Dakota, Texas, Utah, Virginia, West Virginia (28) |
| Uniform Premarital and Marital Agreements Act (2012) | Colorado, North Dakota (2). Introduced in Michigan. |
North Dakota appears under both acts. The 2012 act was written partly because state versions had drifted apart, and partly in response to criticism that the 1983 act was weighted too strongly toward enforcement and did too little to protect the weaker party. If you live in one state and expect to move, a choice-of-law clause and a lawyer licensed where you live now are both worth having.
Postnups: Signing After the Wedding
A postnuptial agreement does the same job after the wedding. The UPMAA calls it a "marital agreement": an agreement between spouses who intend to stay married that affirms, changes or waives a marital right or obligation. Couples often sign one when something changes, such as starting a business, receiving an inheritance, or one spouse running up debt.
The UPMAA applies the same rules to both kinds: written and signed, voluntary, access to a lawyer, financial disclosure, and the same banned terms. The 1983 act covers only premarital agreements, so in states that use it, postnups are governed by other state law. The 2012 act's own commentary notes that many states apply greater scrutiny to agreements signed during a marriage, partly because married people are seen as owing each other duties that engaged couples do not. Ask a lawyer in your state how a postnup would be treated.
Am I Responsible for My Spouse's Debt?
The starting point, in the CFPB's words: "You are generally not responsible for someone else's debt." Marriage does not automatically make you a borrower on loans your spouse signs alone. The exceptions depend on how the debt was taken on and where you live.
Debts you share no matter where you live
If you co-sign a loan or open a credit card as a joint account holder, you owe the debt yourself. Being only an authorized user on your spouse's card is different, and the CFPB says that alone does not make you responsible. Before you add your name to a spouse's account or refinance their debt into a joint loan, know that you are taking on the balance.
Community property states
The IRS lists nine community property states: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington and Wisconsin. Alaska, South Dakota and Tennessee let couples opt into community property. In these states, property either spouse acquires during the marriage while living there is generally community property, owned by both, and the CFPB notes that spouses there "share responsibility for certain debts created during the marriage." The rest of the country follows common-law (separate) property rules, where a debt in one spouse's name is generally that spouse's alone.
Community property states also differ from one another. California is a useful example of how far it can reach:
- The community estate (property owned by both spouses) is liable for a debt incurred by either spouse before or during the marriage.
- One exception protects the non-debtor spouse's paycheck: your earnings during marriage are not liable for your spouse's pre-marriage debt, as long as you keep them in an account your spouse cannot withdraw from and do not mix them with other community money.
That second rule is one practical reason couples marrying with debt in California sometimes keep a separate account. Other community property states have their own rules, and a prenup can change how property is classified, so check with a lawyer where you live.
Necessaries: health care and basic living costs
Some states have "necessaries" laws that make spouses responsible for certain essential costs, such as health care, even in the other spouse's name. The CFPB and FTC both list this as an exception. California's Family Code, for example, makes a married person personally liable for debts their spouse incurs during the marriage for "necessaries of life." Which costs count varies by state.
Debts from before vs during the marriage
| Situation | Common-law states | Community property states |
|---|---|---|
| Spouse's debt from before marriage, in their name only | Generally theirs alone | Theirs, but marital property may be reachable (in California, not your separately kept earnings) |
| Spouse's debt during marriage, in their name only | Generally theirs alone, except necessaries laws in some states | Shared responsibility for certain debts is possible |
| Joint or co-signed debt | Both owe it | Both owe it |
| Authorized user on spouse's card | Not responsible on that basis alone | Not responsible on that basis alone, but community rules can still apply |
If your spouse dies
The CFPB's guidance is that a surviving spouse is generally not responsible for the deceased spouse's debts unless the debt was shared or state law makes them responsible. Debts are paid from the estate, meaning the money and property the person left. If the estate cannot pay, the debt generally goes unpaid. The same exceptions apply: co-signed or joint debts, community property states, and necessaries laws. The FTC adds one more: a person handling the estate who does not follow state probate rules can become personally liable.
Debt collectors may contact a surviving spouse about the debt, but they are not allowed to say or hint that you must pay from your own money when you are not responsible. If you get a written validation notice and dispute the debt in writing within 30 days, the collector must stop contacting you until it verifies the debt. A lawyer or legal aid office can tell you whether a debt is really yours.
What to Write Down Before You Marry
Whether or not you sign a prenup, this is the list to trade with each other. If you do sign one, it doubles as the financial disclosure the agreement depends on, and complete, dated disclosure is your best protection if the agreement is ever challenged.
- Credit reports from all three bureaus. Pull them free at AnnualCreditReport.com, the only site the FTC says is authorized for the free reports; you can check each bureau weekly at no cost. Look for accounts you forgot and anything that looks like fraud (how to read and dispute errors).
- Every debt: lender, balance, interest rate, monthly payment, payoff date, and whose name is on it (yours, theirs, joint, co-signed). Include student loans, car loans, credit cards, medical bills, tax debts, personal loans from family, and any debt you co-signed for someone else.
- Every asset with a value and a date: bank and brokerage accounts, retirement accounts, home equity, vehicles. Statements from the same month make a clean snapshot. A net worth calculator helps you total it.
- Income: recent pay stubs and tax returns, plus side income.
- A business: ownership share, any valuation, partnership or operating agreements, and debts the business owes or you personally guaranteed.
- Expected money: inheritances, trusts, or stock grants that have not vested yet.
- Obligations from a prior relationship: child support, alimony, or a divorce decree that splits a retirement account.
- Your plan for shared money: joint, separate, or both; who pays which bills; whether old debts get paid from shared income. Compare payoff methods in debt avalanche vs snowball.
- Beneficiary forms and wills to update after the wedding so they match whatever you agree.
Start early. Giving each other these documents months ahead leaves time for each partner's lawyer to review them and avoids the last-minute pressure that courts look at when a prenup is challenged.
FAQ
What is a prenup?
A written contract two people sign before marrying that sets rules for their property, debts and, in most states, spousal support during the marriage and if it ends by divorce or death. It takes effect when they marry.
Can a prenup protect me from my partner's debt?
It can say that each person's existing and future debts in their own name stay theirs between the two of you, and how debts are split at divorce. It cannot change what you owe on a loan you co-signed or a joint card, because the lender is not a party to your prenup. Ask a lawyer how creditors are treated in your state.
Am I responsible for my spouse's debt from before we married?
Generally not personally, unless you co-signed or became a joint account holder. In community property states, property owned by both spouses can sometimes be used to pay it. In California, your own earnings are protected from your spouse's pre-marriage debt if you keep them in a separate account your spouse cannot draw on.
Can a prenup decide child support or custody?
No. Both uniform acts bar terms that hurt a child's right to support, and the 2012 act says custody terms do not bind the court.
Do we each need a lawyer?
Strongly recommended, and in some states effectively required for certain terms. California, for example, will not enforce a spousal support clause against someone who did not have independent counsel when signing.
How much does a prenup cost?
It depends on lawyer rates where you live and how complex your finances are. We did not find a government or other primary source that publishes typical prices, so ask attorneys for a flat-fee or hourly quote up front.
Can we sign one after the wedding?
Yes, that is a postnuptial agreement. The 2012 uniform act covers both kinds with the same rules; elsewhere, state law on postnups varies.
This article is for general information and is not legal or financial advice. Prenup and debt rules depend on your state; each partner should talk to their own attorney. Uniform act text and enactment data are from the Uniform Law Commission (uniformlaws.org), California Family Code sections from leginfo.legislature.ca.gov, community property states from IRS Publication 555, and debt guidance from the CFPB and FTC, all read on 2026-10-27.
