TL;DR: A prenup earns a place in your marriage when your state's default rules would divide your money differently from how the two of you would choose, and when there is enough at stake for that gap to matter: property one of you owned first, debt, a business, an inheritance, or a child from an earlier relationship. Work through four questions: what you each own now, what you each owe, what you expect to build, and how hard any of it would be to prove years later. Thin answers across all four mean an agreement may not be worth writing this year. Enforceability is decided case by case under state law, so a prenup shapes what a court considers rather than settling anything in advance.

Somewhere between the venue deposit and the seating chart, one of you says the word out loud. Prenup. What usually follows is a pause, then a scramble for an answer from whoever is willing to give one: a parent with strong feelings, a friend who signed one, a comment section. None of them know what is in your accounts, whose name is on the lease, or which of you is still paying off a graduate degree.

This piece is about your decision rather than the general case. For the definition and the mechanics of what these agreements contain, our guide to what a prenup is and what it covers is the place to start, and who gets a prenup lays out who signs them. What follows is a way to work out whether an agreement earns its place in your marriage, and how to tell when it does not.

Some context before the questions. As of May 2026, 53% of engaged or married Americans under 45 said they had signed a prenup, according to a Harris Poll conducted for Bloomberg. That tells you the document is mainstream. It does not tell you whether it belongs in your marriage, which is a question about your household rather than the country.

Your state already wrote you an agreement

Every marriage comes with financial terms attached, whether or not anyone signs anything. Your state legislature wrote them, they apply from the day you say "I do," and most couples never read them. A prenup replaces some of those default terms with terms the two of you choose. So the useful version of "do I need a prenup" is a comparison: how far is your state's default from what you would decide for yourselves?

The defaults come in two broad flavors. In community property states, most income and assets acquired during the marriage are treated as owned equally by both spouses, and Cornell's Legal Information Institute keeps a plain summary of how community property works. Most states instead use equitable distribution, where a court divides marital property fairly based on a list of factors, and "equitable" does not always mean "equal." Both systems are reasonable. Neither was written with your kitchen-table conversation in mind.

Two details tend to surprise people. The law that applies is generally the law of the state where you live when the question comes up, not the state where the wedding happened, and couples move. The defaults also settle the unglamorous questions: who is responsible for a debt, how a retirement account that grew during the marriage is treated, whether the house one of you bought at 27 stayed separate after a decade of shared mortgage payments. Our guide to what happens if you don't have a prenup walks through those defaults, and how prenuptial agreements vary across states covers the variation between them.

If reading that made you shrug, the shrug is useful information. Plenty of couples find the defaults land close enough to what they would have picked. If it made you sit up, keep going.

Four questions that settle it for most couples

These four cover most of what an agreement can address. Answer them out loud, together, with real numbers in front of you rather than estimates. The exercise is worth doing even if you decide against an agreement, because the conversation carries a good share of the value on its own.

1. What do you each own today?

People marry later than they once did. The U.S. Census Bureau put the 2025 median age at first marriage at 28.4 for women and 30.8 for men, which means most couples reach the wedding with a decade of adult financial history each. A retirement account opened at a first job. A condo bought with help from a parent. A record collection worth more than either of you admits out loud.

Property owned before the wedding is separate property in most states, meaning it belongs to one partner alone. The complication is that separate property does not stay tidy by itself. Pay a premarital mortgage out of a joint account for eight years, add your spouse to the deed, or renovate with shared savings, and the line blurs through what courts often call commingling. A prenup is where a couple writes down what each person brought in and how it is treated once life mixes it together. Our explainer on community property and separate property covers where that line usually sits.

2. What do you each owe?

Debt is the question couples skip and then regret skipping. Student loans. A credit card balance left over from a hard year. A business loan you personally signed for. A car one of you co-signed for a sibling. How premarital debt and debt taken on during the marriage are handled varies by state, and the default answer is not always the intuitive one.

An agreement can set out whose debt is whose, both for the balances you are bringing in and for what either of you takes on later. If one of you is entering the marriage owing substantially more than the other, our guide to what to do when one partner has debt works through the options. This question also flips couples from "we don't have enough for a prenup" to "we have something specific to sort out."

3. What are you likely to build in the next ten years?

An agreement gets written against the balance sheet you are heading toward, several years past the one on your screen this month. A business with two employees now might have twenty. Equity that vests over four years. A house bought with down payments that were nowhere near equal. An inheritance that arrives in the middle of a marriage rather than before it.

Career trade-offs belong here too. If one of you plans to step back from work for a few years to raise a child, that decision carries a real cost to earnings, and an agreement can address how support is handled if the marriage ends. First groups the circumstances couples plan around into a short set of recognizable buckets, which is a faster way to locate your own case than reading everything ever written about prenups. Most couples find their answer sitting in one or two of them.

4. How much would you have to reconstruct later?

Here is the practical test, and couples underrate it. Picture being asked, years from now, to prove where a specific $40,000 came from: which account it started in, whose money it was, what it turned into after two moves and a refinance. Without an agreement, that reconstruction becomes the work, built out of bank statements and memories that have drifted apart.

A prenup front-loads that work instead. Each partner discloses what they have while they both remember it clearly, and the agreement records it in one place. Full disclosure is also among the things courts look hardest at when an agreement is challenged, which is why we treat it as a requirement rather than paperwork. Our piece on why full financial disclosure matters explains what it involves. If your finances would be hard to untangle after ten years of marriage, that difficulty is itself an argument for writing things down now.

Now add up the four answers. Property or savings on one side of the table, meaningful debt, something you expect to build, or a financial picture that would be painful to reconstruct: any one of those is a reason a prenup might earn its place. Two or more, and the case is clear.

When the answer is "not yet"

Some couples work through those four questions and come out the other side with little on the page, and that result deserves to be taken at face value. Two people in their twenties with similar incomes and savings, no property, no business, no inheritance in view, and no children from an earlier relationship may find the state's default rules land close to what they would have chosen anyway. Our look at whether you need a prenup without assets takes that case seriously rather than trying to talk you out of it.

Timing can point to "not yet" as well. An agreement signed under pressure days before the ceremony, with one partner reading it for the first time at the signing table, invites a challenge down the road. If the wedding is three weeks out and the conversation started last night, rushing a document is the worse of the two choices. Couples in that spot often keep talking and handle it after the wedding with a postnuptial agreement, which covers similar ground on a calmer timeline.

"Not yet" is worth separating from "never," though. The circumstances that make an agreement useful have a way of arriving: a business gets started, a parent's estate is settled, a job moves you to a state with different rules, one of you steps back from work. If your answer today is no, put a date on the calendar to ask again. Our guide to how a prenup handles an inheritance is a good example of a question that shows up a few years in.

What saying yes involves

If you land on yes, three things do most of the work in whether an agreement holds up, and none of them are exotic.

Time comes first. Starting months before the wedding rather than weeks gives both partners room to read, ask questions, and change their minds, and it removes the appearance of pressure. Disclosure comes second: each partner lays out assets, income, and debts so the other is agreeing with a full picture. Independent review comes third, which means each partner has their own attorney reading the document on their behalf instead of the two of you sharing one. The Uniform Premarital Agreement Act, the model law behind many states' prenup statutes, sets out related standards: whether an agreement was signed voluntarily, whether there was fair disclosure of each partner's finances, and whether the terms were unconscionable when signed.

What none of that does is settle the outcome ahead of time. Enforceability is decided case by case, by a judge applying your state's law to your circumstances, so a prenup shapes what a court considers rather than deciding it for the court. Our guide to what makes a prenup enforceable covers those factors in detail. Anyone promising you a certain result is overselling.

Cost tends to be the last hurdle, and it is smaller than the reputation suggests. First offers a Self-Serve package for couples who work through the agreement themselves, and a Lawyer Review package that includes an independent attorney for each partner. You can weigh First's packages against what your four answers call for, and for the wider market picture, how much a prenup costs lays out the ranges. No hourly billing, no lawyering-up, no waiting three days for a returned call.

The conversation is the part people dread, and it tends to go better than expected once it starts. If you are working out how to raise it, how to talk to your partner about a prenup offers language that has worked for other couples. Whichever way you decide, you will have spent an evening being specific with each other about money, which few couples regret.

Frequently asked questions

Do I need a prenup if we don't have much money?

Not necessarily, though "not much money" and "nothing at stake" are different things. Debt counts. An expected inheritance counts. So does a difference in earning power that will widen over time. Couples with modest balance sheets often find the value sits in the disclosure conversation more than in the clauses. If your answers to the four questions above are thin across the board, waiting is a reasonable choice.

Do I need a prenup if we plan to keep our finances separate?

Keeping separate accounts does not change the default rules your state applies. Income earned during the marriage, and assets bought with that income, are generally treated as marital property regardless of which account they sit in. If a clean separation of finances is what you both want, an agreement is the document that describes it. Day-to-day habits alone do not.

When in the engagement should we decide?

Earlier is better, and several months before the wedding is a common target. Time lets both partners read the agreement, gather their financial information, and get independent review without pressure, and rushed signings are among the circumstances that invite a later challenge. If you are close to the date already, deciding after the wedding through a postnuptial agreement usually beats compressing the process into the final weeks.

Does wanting a prenup mean we expect the marriage to fail?

Most couples who sign one are doing planning work rather than making a prediction. An agreement is where two people write down what they own, what they owe, and what they want to happen in circumstances they hope never arrive, in much the same spirit as a will. Plenty of couples describe the process as the first time they had a complete picture of each other's finances.

What if we decide against one and later change our minds?

You can revisit the question after the wedding. A postnuptial agreement covers similar ground and is signed by a married couple rather than an engaged one, and couples often reach for one after a business starts, an inheritance arrives, or a move changes which state's rules apply. Some states treat postnups differently from prenups, so local rules matter.

Do we each need our own attorney?

Requirements vary by state, and independent review is one factor courts weigh when an agreement is challenged. A single attorney cannot represent both partners, because your interests differ by definition. First's Lawyer Review package includes an independent attorney for each partner for that reason, and our guide on why each partner needs their own attorney explains the thinking behind it.

Sources

First is not a law firm. The information and tools provided by First on this site are not legal advice and not a substitute for the advice of an attorney.