Is a prenup legally binding?

Yes — when it's done right. A prenup needs to be in writing, signed by both parties voluntarily, based on full financial disclosure, and it must meet your state's signing rules (witnesses, notarization, waiting periods). Courts look closely at whether both people understood and agreed to it freely. Requirements vary by state.

Do we need a lawyer to get a prenup?

Most states don't force you to hire an attorney for a prenup to exist. But independent legal advice on each side is the single biggest factor courts weigh when they later review an agreement — and a few states, like California, have specific counsel rules. The practical middle path is an online service with an attorney review.

Are prenups just for rich people?

No. The most common prenup situations are ordinary: a house with unequal down payments, a small business, kids from a previous marriage, one partner staying home with children, or simply different incomes. Prenups are less about having a lot of money and more about having assets or obligations worth clarifying.

What is the difference between a prenup and a postnup?

Timing. A prenup is signed before the wedding. After the wedding, the equivalent document is called a postnuptial agreement — and courts generally review those more closely because the spouses already owe each other duties of loyalty under the law.

Does getting a prenup mean we don't trust each other?

Most couples who sign one would say the opposite: it's easier to agree on paper, calmly, than to negotiate later under stress. It's a financial planning document — closer to a will than to a breakup plan. Our guide on prenups and trust digs into this directly.

What Is a Prenup? A Plain-English Guide for Engaged Couples

The short version

A prenuptial agreement ('prenup') is a written contract two people sign before marriage that sets rules for how money, property, and debt are handled — during the marriage and if it ends. It's valid in every state when it's in writing, signed voluntarily, backed by honest financial disclosure, and it follows your state's formalities.

Short answer: a prenup (short for prenuptial agreement) is a legal contract you and your partner sign before getting married that sets the rules for your money — who owns what going in, how assets and debts are handled during the marriage, and what happens if you divorce or one of you dies.

It is not a prediction of divorce. Think of it as the instruction manual for the financial side of a marriage — written while everyone is calm and thinking clearly.

Here’s what it actually does, what it can’t do, and how couples put one together.

What a prenup actually does

At its core, a prenup changes the default rules your state would otherwise apply to your marriage. Those defaults (called marital property laws) decide things for you if you never agree otherwise:

Whether earnings during the marriage become shared “marital property” — or stay separate
What happens to the house, accounts, and investments if you divorce
Which debts follow a spouse and which don’t
Whether spousal support (alimony) would be on the table
How inheritance and estate rights are handled

A prenup lets you and your partner choose your own rules instead. Common examples:

The house stays with whoever bought it, no matter who paid the mortgage
A business started before — or after — the marriage stays with its owner
Each partner keeps their own retirement accounts
Existing debts (student loans, credit cards) stay with the person who owes them
An inheritance from one family never becomes marital property

Once you sign it and the marriage begins, the agreement sits in a drawer until you need it — either when life changes (you update it) or if the marriage ends (a court follows it, as long as it meets your state’s rules).

What a prenup can’t do

Being straight about the limits matters:

Child custody and child support. No prenup can decide these. Family courts decide what’s best for the child, every time, regardless of what you wrote.
Day-to-day marriage rules. Chores, fidelity clauses, and “he must cook on Sundays” may sound clever at signing; courts have little patience for them, and they can drag down the whole document.
Anything signed under pressure. An agreement one partner was rushed into before the wedding is the classic way a prenup dies in court.

Beyond those limits, the range is wide: property, debt, support, and inheritance terms are all fair game — subject to your state’s law.

Who actually gets a prenup

Forget the stereotype. The typical prenup situations are pretty ordinary:

One partner owns a house or came in with a larger down payment — the other partner has been paying rent for years and has nothing to show for it. A prenup settles who contributed what.
A small business or freelance practice — protection against the business becoming a bargaining chip in a divorce.
Kids from a previous marriage — a parent wants certainty that what passes to their children stays with their children.
Big income gap or a stay-at-home spouse — clarity on how finances work if the marriage ends, so neither side is guessing.
Significant debt on one side — the other partner wants to know what’s theirs and what isn’t.

If any of those sound like your situation, you’re in normal company.

How couples actually get one

The process is less dramatic than it sounds:

Talk about it. Both partners have to want it — courts require genuine agreement, and no one can be pressured into signing.
Exchange full financial disclosure. Each side lists assets, debts, and income. This isn’t optional — hiding an account is the fastest way to invalidate an agreement later.
Draft the document. Either a family-law attorney drafts it, or you build it through an online service with state-specific questions.
Review — ideally with separate lawyers. Each partner should understand exactly what they’re giving up. Independent advice is what makes an agreement hold up years later.
Sign with your state’s formalities. Depending on where you live: witnesses, notarization, and in some states a waiting period between the final draft and signing.

For most couples with straightforward finances, the whole thing takes a few weeks to a few months — and costs far less than people assume. The full walk-through of how a prenup works, step by step, covers each of those five stages in detail.

What about state law?

State law can differ — sometimes a lot. Community-property states (like Texas and California) divide marital property differently than equitable-distribution states (like New York and Florida). Some states require specific signing formalities; others don’t.

Before you draft anything, check the rules where you’ll be filing: every state has its own prenup page on this site covering the essentials.

What to do next

If you’re early in the decision, the honest first question isn’t “how do we get one?” — it’s whether your situation actually needs one. That’s a five-minute read: Do I need a prenup?

From there, the usual path looks like what a prenup can cover → how to bring it up with your partner → the prenup checklist.

Sources

Cornell Law School, Legal Information Institute — Prenuptial agreement (Wex)
American Bar Association, Family Advocate — What Is a Prenuptial Agreement?