Prenup Cost Calculator: Attorney Fees by State
A prenup cost calculator shows what a prenuptial agreement actually costs in your state, factoring in whether both parties have their own attorneys (usually required for enforceability), the complexity of your assets, and state-specific rules like California's mandatory 7-day waiting period.
The calculator above applies published attorney fee data — NYC $2,500–$10,000+ per party, California $3,000–$10,000+, Florida and Texas $1,500–$5,000, national baseline $1,500–$8,000 — and adds each state's UPAA / UPMAA adoption status and independent-counsel requirement.
For a moderate California prenup with both parties represented (functionally required under Cal. Fam.
Code §1615(c)), expect $9,000 to $16,000 total.
How it's calculated
Prenup costs move on three axes: state cost of living, complexity of assets, and whether each party retains their own attorney.
State cost matters because attorney rates in high-cost metros dominate. New York City and California high-net-worth prenups regularly hit $5,000–$10,000+ per party for straightforward drafting, and international assets or business interests push complex prenups above $10,000 per party. Florida, Texas, and mid-tier metros run 40–60% below NY/CA prices at each complexity tier. The national baseline (from ContractsCounsel and TheKnot survey data) is $1,500–$3,500 per party simple, $2,500–$5,000 moderate, $4,000–$8,000 complex.
Both-parties-attorney is the biggest cost lever — and often functionally required. California's Cal. Fam. Code §1615(c) makes waivers of spousal-support or property rights unenforceable without independent counsel, so a prenup drafted by one party's attorney and signed by the other without counsel is largely worthless in California. New Jersey requires a written waiver of the opportunity to consult counsel if a party lacks one, and courts everywhere weight independent counsel heavily in enforceability review. Total cost when both parties retain separate attorneys is roughly 2× the per-party number.
UPAA adoption (Uniform Premarital Agreement Act, 1983) simplifies enforceability in ~28 states plus DC. UPMAA (2012) — a stricter version with more procedural safeguards — has been confirmed adopted only in Colorado and North Dakota so far, though more states have introduced legislation. Non-UPAA states include Ohio (Gross v. Gross test), Georgia (Scherer v. Scherer three-part test), and Louisiana (civil-law authentic-act requirement with notary and two witnesses).
California's other trap: the 7-day waiting period under §1615(c)(2)(B) — 7 calendar days minimum between presentation of the final agreement and signing. It cannot be waived. A prenup signed before that 7-day window is unenforceable, regardless of whether both parties agree to skip it. Combined with the independent-counsel rule, California is the strictest state to enforce a prenup in and requires the most lead time before the wedding.
Universal requirements across all states: written form, voluntary execution, full financial disclosure of assets/income/debts, and terms not unconscionable at execution. Prenups cannot bind child custody or child support decisions — those are always reviewed under the court's best-interest standard.
A worked example
Take the calculator's default: a moderate-complexity California prenup with both parties retaining their own attorneys. California per-party base: $4,500–$8,000 moderate.
Two attorneys × 2 = total $9,000–$16,000. California-specific rules apply: Cal.
Fam. Code §1615(c) makes independent counsel functionally required (already factored in via the both-parties-attorney selection), and §1615(c)(2)(B) requires a mandatory 7-day waiting period between final agreement presentation and signing — non-waivable.
California is a community property state, so the prenup essentially opts out of the default 50/50 marital property regime for assets defined in the agreement. Result: $9,000–$16,000 total, with a hard 7-day timeline requirement before signing.
Common mistakes to avoid
- Signing a California prenup within 7 days of the wedding. Cal. Fam. Code §1615(c)(2)(B) requires 7 calendar days minimum between final agreement presentation and signing — no exceptions. Signing sooner voids the agreement.
- Using one attorney for both parties. In California, waivers of spousal-support/property rights are unenforceable without independent counsel. Everywhere else, courts weight the absence of independent counsel heavily against enforceability under the unconscionability analysis.
- Skipping full financial disclosure. UPAA and all case-law states require full disclosure of assets, income, and debts. Hiding assets is the fastest way to get a prenup thrown out at enforcement.
- Including child-custody or child-support terms. Universally unenforceable — these are the child's rights, not the parents', and the court applies a best-interest standard regardless of what parents agreed to.
- Waiting until the week of the wedding. Even in non-California states, last-minute signing is a factor in duress/voluntariness analysis. Aim for 30+ days before the wedding as a floor.
- Signing an oral prenup. No state recognizes oral prenups. Written form is required in every jurisdiction.
Frequently asked questions
How much does a prenup cost?
Prenup costs run $1,500 to $10,000+ per party depending on state and complexity. National baseline: simple $1,500–$3,500 per party, moderate $2,500–$5,000, complex $4,000–$8,000. High-cost metros run 60–80% above that: NYC $2,500–$12,000+ per party, California $3,000–$12,500+. Because independent counsel is functionally required for enforceability in most cases (and mandatory in California for waivers under Cal. Fam. Code §1615(c)), plan on both parties retaining attorneys — double the per-party number for the total.
How much does a prenup cost in NYC, California, Texas, or Florida?
State-by-state per-party attorney fees for a moderate prenup: New York City $4,000–$7,500 per party, California $4,500–$8,000, Texas and Florida $2,500–$4,500, Washington $3,500–$6,000, New Jersey $3,500–$6,000, Illinois $3,000–$5,500. With both parties represented (typical), total cost is 2× the per-party number — a moderate NYC prenup runs $8,000–$15,000 total. High-net-worth cases with business interests, international assets, or blended families push complex prenups above $10,000 per party.
Do I need my own attorney for a prenup?
In California, yes — Cal. Fam. Code §1615(c) makes waivers of spousal-support or property rights unenforceable without independent counsel. Everywhere else, independent counsel is not statutorily required but is strongly recommended and heavily weighted by courts in the unconscionability analysis. New Jersey requires a written waiver of the opportunity to consult counsel if a party lacks one. Practically, retaining separate attorneys is the single strongest step toward an enforceable prenup and is worth the added cost.
How long before the wedding do we need to sign a prenup?
In California, there is a mandatory 7-day waiting period between the final agreement being presented and signing (Cal. Fam. Code §1615(c)(2)(B)) — non-waivable. Everywhere else, there's no statutory waiting period, but last-minute signing (days before the wedding) is a factor in the duress/voluntariness analysis at enforcement. Aim for 30+ days before the wedding as a floor everywhere; 60+ days is safer. In California, start the process at least 2 months before the wedding to allow for drafting, review, and the 7-day final window.
What states have adopted the Uniform Premarital Agreement Act?
About 28 states plus DC have adopted the Uniform Premarital Agreement Act (UPAA, 1983) or its 2012 successor, the Uniform Premarital and Marital Agreements Act (UPMAA). UPAA states include Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Maine, Montana, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, North Dakota, Oregon, Rhode Island, South Dakota, Texas, Utah, Virginia, and Wisconsin. Colorado and North Dakota have confirmed adoption of UPMAA (2012). Notable non-UPAA states: Ohio, Georgia, Louisiana (civil-law regime), and New York.
What can and can't a prenup enforce?
A prenup can enforce: property division at divorce or death, spousal support waivers or caps (subject to state limits), business protection provisions, debt allocation, and inheritance rights. A prenup CANNOT enforce: child custody or child support (always subject to court's best-interest review — universally unenforceable), terms that encourage divorce (void in most jurisdictions), or terms unconscionable at execution (UPAA) or at enforcement (many states). Personal or lifestyle clauses — weight loss, chores, sexual frequency — are generally unenforceable, though non-financial breach penalties are sometimes upheld.
Sources
We prioritize primary sources for rules, formulas, rates, limits, and definitions. See our calculator methodology and editorial policy.