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Prenuptial Agreement Guide

Protecting what's yours before you say 'I do' — what a prenup covers, what it can't, and how to make it enforceable.

Updated 2026-08-11·6 min read·Reviewed by AG FinTax

A prenuptial agreement (prenup) is a contract between two people who plan to marry, defining how assets, debts, and support will be handled if the marriage ends. It's not romantic, but it's practical — and it prevents the most painful disputes in a divorce.

What a prenup can cover

  • Asset division — how pre-marital and marital assets will be divided.
  • Debt responsibility — who's responsible for debts incurred before and during the marriage.
  • Spousal support — whether alimony will be paid, how much, and for how long.
  • Property classification — what's considered separate (pre-marital) vs. marital.
  • Business interests — protecting a business or professional practice owned before marriage.

What a prenup can't cover

  • Child custody — courts decide custody based on the best interests of the child at the time of divorce, not based on a prenup.
  • Child support — same as custody — determined by state guidelines at the time.
  • Personal habits — weight gain, household chores, or personal behavior (these clauses are not enforceable).
  • Illegal terms — anything that violates public policy or state law.

Enforceability requirements

For a prenup to be enforceable, it must meet these conditions:

  • Written and signed — oral agreements don't count.
  • Voluntary — no duress, coercion, or undue influence. Both parties should have independent attorneys.
  • Full disclosure — both parties must fully disclose all assets, debts, and income.
  • Fair and reasonable — the terms can't be so one-sided that they're unconscionable.
  • Time — the agreement should be signed well before the wedding (at least 30 days is recommended).
The #1 reason prenups get thrown out is lack of independent legal counsel. Each spouse should have their own attorney review the agreement. If one attorney drafted it and the other didn't have a lawyer, courts are skeptical.

Make it legal

  • Both parties sign voluntarily.
  • Each party should have independent legal counsel.
  • Full financial disclosure from both parties.
  • Sign well before the wedding date.
  • Each party keeps a signed copy.

A state-specific prenuptial agreement drafted to your situation takes about ten minutes.

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This guide is general information, not legal, tax, or accounting advice for your specific situation. State rules and fees change. For decisions that matter, review your plan with a licensed professional — AG FinTax's CPAs are available. See our disclaimer.