Prenup Postnup Agreement Cost Calculator
Prenuptial and postnuptial agreements cost $1,500-$10,000+ depending on asset complexity, state, and attorney rates. Simple prenups with few assets are quicker. Complex agreements with business interests, trusts, or international assets cost significantly more.
What Prenups Cover
Pre-marital asset protection, separate property identification, debt allocation, spousal support waiver or formula, business interest protection, inheritance protection, retirement account treatment. NOT enforceable: child custody and child support (always set by court at time of divorce, regardless of prenup terms).
Enforceability Requirements
Both parties need: (1) independent legal counsel — single-attorney prenups commonly challenged, (2) full financial disclosure — hiding assets voids the agreement, (3) reasonable terms — extremely one-sided agreements get struck down, (4) execution well before wedding (30+ days) — last-minute agreements signed under duress are invalidated.
Postnup vs Prenup
Postnuptial agreements are signed after marriage. Same enforceability requirements but face higher court scrutiny because marriage itself is consideration. Common reasons for postnup: business sale, inheritance, infidelity discovery, post-marriage asset acquisition. Cost is similar to prenup ($2K-$10K range).
Source: American Academy of Matrimonial Lawyers (AAML) prenup standards, Uniform Premarital Agreement Act state implementations, AAML state-by-state divorce manual. Last updated: May 2026.