A prenuptial agreement ("prenup") is a written contract two people sign before they marry. It sets out what happens to property, debts and, in many states, spousal support if the marriage ends by divorce or death. It takes effect when you marry.
The honest answer to "how much does a prenup cost" is: it depends mostly on how many hours two lawyers spend on it. There's no independent national survey of prenup prices. Below, we show what drives the cost, what lawyers charge per hour according to published billing data, and the legal basics that decide whether your prenup will hold up.
This is general information as of October 2026, not legal advice. Prenups are governed by state law. Talk to a family lawyer licensed in your state.
What a prenup costs, and why there's no single price
Most of the cost is attorney time. Clio, a legal practice software company, publishes average hourly rates by practice area from its billing data (described on its pages as 2026 data). Its figures for family lawyers in five large states:
| State | Average family lawyer rate (Clio) |
|---|---|
| New York | $423 per hour |
| California | $422 per hour |
| Texas | $392 per hour |
| Florida | $386 per hour |
| Illinois | $353 per hour |
Averages hide a wide spread: rates vary by city, experience and firm.
About the "average prenup cost" figures you'll see online. A commonly quoted figure is about $8,000 per couple, from a survey of family lawyers run by HelloPrenup, a company that sells online prenups (cited, for example, in a Zola article sponsored by HelloPrenup, last updated March 18, 2025). Because it comes from a company selling an alternative, we treat it as one data point, not a benchmark. The same article lists online prenup services from $0 for templates up to $599 for HelloPrenup's own product, plus paid add-ons for a lawyer's call or review.
What pushes the price up or down
- Complexity of your finances: a business, stock options, real estate, trusts, inheritances, or debts you want to keep separate.
- How much you negotiate: every round of revisions is billed time on both sides.
- Whether one lawyer drafts and the other reviews: reviewing a draft usually takes less time than writing it.
- Flat fees: some lawyers offer a flat fee for drafting or reviewing. Ask what's included and how many revisions it covers.
- Financial disclosure: gathering statements and valuations takes time, yours and theirs.
Example calculation (hypothetical)
The hours below are made up for illustration. They are not an estimate from any study.
Suppose the drafting lawyer spends 6 hours and the reviewing lawyer spends 3 hours, both in Texas at the Clio average of $392 per hour:
- Drafting: 6 × $392 = $2,352
- Review: 3 × $392 = $1,176
- Total for the couple: $3,528
Double the hours because of a business valuation and two rounds of negotiation, and the total doubles too.
Ask each lawyer for an estimate in writing. If you're saving up for the wedding as well, the monthly savings calculator and the cost split calculator can help you plan both.
The law behind prenups: UPAA and UPMAA
Prenups are a matter of state law, but many states follow one of two model laws written by the Uniform Law Commission (ULC):
- Uniform Premarital Agreement Act (UPAA), 1983. A ULC summary from 2013 says it had been adopted by 26 jurisdictions. California is one of them: its Family Code chapter on premarital agreements opens with "This chapter may be cited as the Uniform Premarital Agreement Act" (Fam. Code 1600). Many states changed the text when adopting it, so the rules aren't identical even among UPAA states.
- Uniform Premarital and Marital Agreements Act (UPMAA), 2012. It covers both prenups and agreements signed during marriage (postnups) under the same rules. North Dakota (chapter 14-03.2, for agreements signed after July 31, 2013) and Colorado (C.R.S. 14-2-301 and following, effective July 1, 2014) have adopted it.
Other states rely on their own statutes and court decisions. The ULC keeps a current enactment map on each act's page. Check it, or ask a lawyer, for your state's rules.
The core rules under the UPAA
- In writing and signed by both of you. No consideration is needed (section 2).
- Takes effect on marriage (section 4). After the wedding, it can be changed or revoked only in a signed writing (section 5).
- What it can cover (section 3): rights in property, whenever acquired; buying, selling and managing property; what happens to property on separation, divorce or death; changing or eliminating spousal support; wills and trusts to carry out the agreement; life insurance death benefits; which state's law applies; and other matters that don't violate public policy or criminal law.
- When it isn't enforced (section 6): if the party challenging it proves they didn't sign voluntarily, or that it was unconscionable when signed and they didn't get fair and reasonable disclosure of the other person's property and debts, didn't waive that disclosure in writing, and didn't have adequate knowledge of it.
- Safety valve for spousal support: if waiving support would leave a spouse eligible for public assistance, a court may order support anyway, to the extent needed to avoid that.
What the UPMAA adds
The 2012 act tightens the process. An agreement is unenforceable if the challenging party proves:
- consent was involuntary or the result of duress;
- they didn't have access to independent legal representation, meaning a reasonable time to decide on, find and consult a lawyer, and, if the other side had a lawyer, the money to hire one or an offer from the other side to pay;
- if they had no lawyer, the agreement didn't include a plain-language explanation or a notice of the rights being waived (the act gives model wording, such as giving up the right to be supported by your spouse);
- they didn't get adequate financial disclosure: a reasonably accurate description and good-faith estimate of the other person's property, debts and income, unless they waived it in a separate signed record or already knew.
Why each partner needs their own lawyer
One lawyer can't represent both of you in a prenup, because your interests are opposite: whatever one of you gives up, the other gains.
The UPAA doesn't strictly require lawyers, but its official comment says the lack of independent counsel may be a factor when a court decides whether you signed voluntarily. The UPMAA goes further and makes access to an independent lawyer a condition. California is the strictest:
- Spousal support: a clause limiting or waiving spousal support isn't enforceable if the person giving up support didn't have independent counsel when signing, or if the clause is unconscionable when it would be enforced (Fam. Code 1612(c)).
- Voluntariness: a California court will treat a prenup as not signed voluntarily unless it finds, among other things, that the challenging party had independent counsel or expressly waived it in a separate writing after being advised to get one (Fam. Code 1615(c)).
Timing: don't sign the week of the wedding
The closer to the wedding the agreement is presented, the easier it is to argue that someone signed under pressure.
California's 7-day rule (Fam. Code 1615(c)):
- For agreements signed on or after January 1, 2020, the party must have had at least 7 calendar days between first receiving the final agreement and signing it, whether or not they have a lawyer.
- The advice to seek independent counsel must also be given at least 7 calendar days before signing.
- Nonsubstantive changes that don't alter the terms don't restart the clock.
- If the party had no lawyer, the explanation of the terms and the rights given up must be in writing, delivered before signing, and the party must sign a document saying they received it.
Other states don't have a fixed number of days, but courts look at timing. The UPMAA's official comment lists cases going both ways: agreements presented two or three days before the wedding were found involuntary in some cases (Washington, 2009; North Dakota, 2002) and voluntary in others (Alabama, 2009; North Dakota, 2004).
A practical plan: start the conversation early in your planning, ideally several months before the wedding, so there's time for disclosure, two lawyers and revisions. Add it to your wedding planning checklist next to the marriage license.
What a prenup can't include
| Clause | Why it doesn't work |
|---|---|
| Limiting child support | UPAA section 3(b) and California Fam. Code 1612(b): a child's right to support can't be adversely affected. UPMAA section 10(b)(1) says the same. |
| Deciding custody, parenting time or visitation | UPMAA section 10(c): such terms are not binding on the court. The official comment notes a long-standing consensus that prenups can't decide custody or visitation. |
| Limiting remedies for domestic violence | UPMAA section 10(b)(2). |
| Changing the grounds for divorce or penalizing a spouse for filing | UPMAA section 10(b)(3)–(4). |
| Lifestyle or infidelity penalties | Not listed in the UPMAA, but its comment cites California cases refusing to enforce a financial penalty for infidelity (2002) and for drug use (2004). |
| Anything illegal or against public policy | UPAA section 3(a)(8). |
The UPMAA comment notes that an agreed increase in child support may be enforceable. It's limits on support that don't work.
What to prepare before you see a lawyer
- A list of your assets with approximate values: accounts, retirement plans, real estate, a business, vehicles.
- Your debts: student loans, mortgages, credit cards.
- Your income, recent tax returns and expected inheritances or gifts.
- Your goals: what you want to keep separate, what you want to share, what happens to the home.
- Estate plans: a prenup often goes hand in hand with updated wills and beneficiaries.
Full disclosure protects the agreement. Under both uniform acts, inadequate disclosure is one of the main ways to challenge a prenup.
If one of you is marrying again or has children from a previous relationship, a prenup often comes up alongside estate planning. See our second wedding etiquette guide for the wedding side.
FAQ
How much does a prenup cost?
There's no reliable national average. The cost is mostly attorney time for two lawyers. Clio's data puts the average family lawyer rate at $353–$423 per hour in New York, California, Texas, Florida and Illinois. A frequently quoted $8,000 per couple comes from a survey by a company that sells online prenups.
Do we both need a lawyer?
Two separate lawyers are strongly recommended and, in some situations, effectively required: in California, a spousal support waiver is unenforceable if the waiving party didn't have independent counsel. Under the UPMAA, a party must at least have had access to a lawyer.
How long before the wedding should we sign?
In California, at least 7 calendar days must pass between receiving the final agreement and signing it. Elsewhere there's no fixed number, but signing days before the wedding invites a challenge. Start months ahead.
Can a prenup decide custody or child support?
No. A prenup can't reduce a child's right to support, and custody terms don't bind the court.
Can we sign a prenup after the wedding?
Then it's a postnuptial (marital) agreement. States that adopted the UPMAA apply the same rules to both; other states treat postnups differently. Ask a lawyer in your state.
Sources
- Uniform Law Commission, Uniform Premarital Agreement Act (1983), final act with prefatory note and comments, sections 1–8: https://www.uniformlaws.org/committees/community-home?CommunityKey=2e456584-938e-4008-ba0c-bb6a1a544400 (UPAA final text downloaded from the ULC library)
- Uniform Law Commission, Uniform Premarital and Marital Agreements Act (2012), final act with comments, sections 9 and 10; and ULC summary "The Uniform Premarital and Marital Agreements Act" ("adopted by twenty-six jurisdictions"), ULC enactment kit: https://www.uniformlaws.org/viewdocument/enactment-kit-37?CommunityKey=2e456584-938e-4008-ba0c-bb6a1a544400&tab=librarydocuments
- North Dakota Century Code, chapter 14-03.2, Uniform Premarital and Marital Agreements Act: https://ndlegis.gov/cencode/t14c03-2.pdf
- Colorado Revised Statutes 14-2-301 (short title; part 3 repealed and reenacted in 2013, effective July 1, 2014), via Justia: https://law.justia.com/codes/colorado/2022/title-14/article-2/part-3/section-14-2-301/
- California Family Code 1600, 1612 and 1615, via FindLaw (official text at leginfo.legislature.ca.gov): https://codes.findlaw.com/ca/family-code/fam-sect-1615/ and https://codes.findlaw.com/ca/family-code/fam-sect-1612/
- Clio, "How much should I charge as a lawyer" state pages (average family lawyer hourly rates; 2026 billing data), read 27 October 2026: https://www.clio.com/resources/legal-trends/compare-lawyer-rates/ny/ (also /ca/, /tx/, /fl/, /il/)
- Zola, "How Much Does a Prenup Cost?" (sponsored by HelloPrenup, last updated March 18, 2025): https://www.zola.com/expert-advice/how-much-does-a-prenup-cost
- The example calculation is our own illustration.
General information as of 27 October 2026, not legal advice. Prenup law differs by state; confirm with a family lawyer licensed in your state.