Prenuptial Agreements: The Complete Financial Guide

A prenuptial agreement (prenup) is a legal contract signed before marriage that defines how assets and debts will be divided if the marriage ends in divorce or death. Contrary to popular belief, prenups are not a sign of distrust or a prediction of failure, they're a financial planning tool that every couple with meaningful assets should consider. Without a prenup, your state's default divorce laws determine how your property is divided. In community property states (California, Texas, Arizona, and several others), most assets acquired during marriage are split 50/50 regardless of who earned them. In equitable distribution states, courts divide assets 'fairly', which may not mean equally, but still involves significant judicial discretion. A prenup lets you and your partner define your own rules rather than defaulting to the state's.

A prenup can address: protection of pre-marital assets (savings, investments, real estate you owned before the marriage), protection of expected inheritances, division of business ownership or equity, treatment of debt each party brings to the marriage, alimony waiver or cap, and how specific assets (like a family home or investment account) will be handled in divorce. A prenup cannot cover: child custody or child support (courts determine this based on the child's best interest at the time of divorce, not a prior contract), provisions that incentivize divorce or are otherwise illegal, waiving rights to government benefits like Social Security survivor benefits, or anything fraudulent. The best prenups are specific, fair, and don't attempt to cover things a court will throw out anyway.

Prenups provide the most protection in situations where there's a meaningful financial disparity or asymmetry entering the marriage. You should strongly consider a prenup if: you own a business or have equity in one; you have significant retirement savings or investment accounts; you expect a substantial inheritance; you have children from a prior relationship and want to protect assets intended for them; you have significant debt (student loans, business debt) you don't want to become joint; or you earn substantially more than your partner. The threshold isn't 'millionaire', someone with $100,000 in a 401(k), a small business with $50,000 in equity, or an expected inheritance from parents has real assets worth protecting.

Step 1: Start early. Prenups signed close to the wedding date (within 30 days) are more likely to be challenged as signed under duress. Start the conversation at least 3–6 months before the wedding. Step 2: Both parties need separate attorneys. A prenup signed without independent legal counsel for both parties is easily voided in court. Step 3: Full financial disclosure. Both parties must fully disclose all assets, liabilities, and income. Hiding assets renders a prenup unenforceable. Step 4: Work with a financial advisor first. Before your attorneys start drafting, meet with a financial advisor to inventory your assets, model different division scenarios, and clarify what you're actually trying to protect. This makes the legal process faster and less expensive. Step 5: Negotiate and draft. Your attorneys draft the agreement based on the terms you've agreed to. Both parties review independently. Step 6: Sign and notarize. In most states, a prenup must be in writing, signed by both parties, and witnessed/notarized.

A basic prenup drafted by an attorney typically costs $1,500–$3,000 for straightforward situations (no business, modest assets). Complex prenups involving business ownership, multiple properties, investment portfolios, or trust structures run $5,000–$10,000 or more. Each party pays their own attorney. The total cost for a straightforward prenup for both parties is usually $3,000–$6,000. This sounds like a lot until you compare it to the average divorce cost ($15,000–$30,000+ in legal fees) or the value of what the prenup protects. A $4,000 prenup that protects a $150,000 retirement account and a $50,000 business equity stake is an extremely high-return investment.

An attorney drafts the prenup. A financial advisor figures out what it should say. Specifically, a financial advisor helps you: inventory all current assets and their after-tax values, project the future value of retirement accounts and investments so you understand what you're protecting over a 10–30 year time horizon, model what 'equitable' division would look like under your state's default rules versus under your proposed prenup terms, identify assets you may have forgotten (vested stock options, deferred compensation, future inheritance expectations), and advise on how to structure joint accounts and finances during the marriage so the prenup remains enforceable. Many people go straight to an attorney without this step and end up with a prenup that's technically valid but doesn't actually protect the right things. A 1–2 hour session with a financial advisor before engaging attorneys is typically the most cost-effective part of the whole process.