A prenuptial agreement is a written contract two people sign before marrying that decides who keeps what, who owes what, and what support looks like if the marriage ends by divorce or death. Prenuptial agreements let a couple replace their state’s default rules with terms they negotiate themselves, and in roughly 29 states and the District of Columbia those contracts are governed by some version of the Uniform Premarital Agreement Act or its 2012 update.
Without one, state law fills the gap. Nine states follow community property rules, under which almost everything earned or acquired during the marriage belongs equally to both spouses. The remaining 41 states and D.C. use equitable distribution, where a judge divides marital property based on fairness rather than a fixed split, and “fair” turns on the judge and the facts. Default rules also control spousal support, debt responsibility, and a surviving spouse’s statutory right to inherit a share of the estate regardless of what the will says.
What a Prenup Can Cover
The Uniform Premarital Agreement Act gives couples broad room to address financial matters. Parties can agree on the rights and obligations each has in any property either spouse owns, whenever and wherever it was acquired. That reaches real estate, business interests, investment and retirement accounts, and assets that don’t yet exist on the signing date.
The provisions people most often include are:
- Separate property protection, so assets owned before the marriage stay with the original owner instead of becoming marital property.
- Debt allocation, assigning pre-existing student loans, credit card balances, or other obligations to the spouse who brought them in.
- Spousal support terms, including modifying or waiving alimony. A waiver can still be overridden if enforcing it would leave one spouse eligible for public assistance at the time of divorce.
- Inheritance waivers, which give up the statutory share of a spouse’s estate. These matter most when one or both spouses have children from a prior marriage.
- Life insurance ownership and beneficiary terms.
- Business interests, keeping a family business or professional practice out of the marital pool.
The Act also allows agreements on any other matter not in violation of public policy or a statute imposing a criminal penalty, so couples sometimes include terms about how jointly acquired property will be split or which state’s law governs the contract if they move.
What a Prenup Cannot Cover
Some subjects are off the table everywhere. Child custody and child support provisions are unenforceable throughout the United States. Judges decide those at the time of separation using the child’s best interests, and they will not defer to terms the parents wrote years earlier, possibly before the child existed.
Clauses that encourage divorce are also void. A provision that pays a spouse for ending the marriage violates public policy. The same goes for terms requiring illegal conduct or regulating personal behavior, such as weight limits or chore assignments. If an agreement mixes enforceable and unenforceable terms, most courts strike the bad clauses and keep the rest rather than voiding the whole document.
What Makes a Prenup Enforceable
A prenup that falls short of basic legal requirements is just paper. It must be in writing and signed by both parties. Oral agreements carry no weight.
Voluntary Signing
Both people must sign voluntarily, free of coercion, fraud, or threats. Timing drives this analysis. A document presented the week before the wedding, after invitations have gone out and deposits are paid, puts real pressure on the other spouse, and that pressure can later be argued as duress. Courts look at the whole picture, not just whether someone physically forced the pen.
Fair Financial Disclosure
Each party must give a fair and reasonable disclosure of their property and debts. Under the original Uniform Premarital Agreement Act, a prenup is unenforceable if the challenging party was not given adequate disclosure, did not waive it in writing, and could not reasonably have known about the other’s finances. Hiding assets is the fastest way to lose the agreement.
Unconscionability
Even with voluntary signing and full disclosure, a court can refuse to enforce terms that are unconscionable, meaning so one-sided no reasonable person would have agreed to them. Under the original Act, unconscionability is judged at the time of signing. The 2012 Uniform Premarital and Marital Agreements Act goes further and lets courts reject terms that would cause substantial hardship because of circumstances that changed after signing.
Independent Legal Counsel
Neither version of the uniform act strictly requires each party to have their own lawyer, but independent counsel sharply strengthens enforceability. The 2012 update requires at least that each party have access to independent legal representation, meaning reasonable time and ability to consult a lawyer, whether or not they used it. When one spouse is represented and the other is not, the represented spouse may need to pay for the other’s attorney. Skipping this step is the kind of saving courts routinely punish later.
Pulling Together Financial Disclosure
Proper disclosure is a snapshot of everything each person owns and owes on the signing date, usually attached to the agreement as a schedule of assets and liabilities. That means current values on real estate, recent statements for bank, brokerage, and retirement accounts, formal valuations or tax returns for any business interests, pay stubs and tax returns for income, and current balances on mortgages, car loans, student loans, and credit cards. A clean spreadsheet helps the drafting attorney build an accurate contract and gives both sides something objective to negotiate against.
Cryptocurrency and Other Digital Assets
Cryptocurrency, NFTs, decentralized finance holdings, and blockchain-linked income are easy to miss and increasingly significant. Several jurisdictions now expect these to be disclosed separately rather than lumped into “other assets.” If either of you holds crypto on exchanges or in hardware wallets, the disclosure should identify the specific wallets, exchanges, and account identifiers, along with who controls the private keys. Leaving out a six-figure Bitcoin wallet carries the same legal consequences as hiding a brokerage account.
Timing and Execution
Signing at least 30 days before the wedding is the widely recommended minimum, and many family law attorneys push for several months. The closer the signing sits to the ceremony, the easier the duress argument becomes later. A prenup signed the night before the wedding is almost designed to be challenged.
When the document is final, each spouse should meet separately with their own attorney to walk through every provision and understand what rights they are giving up. Attorneys often provide a certificate of independent legal advice confirming that review, which becomes useful evidence if the agreement is attacked later.
Both parties sign in front of a notary public, who verifies identities and records the date. Each spouse and each attorney should keep an original executed copy somewhere secure but findable. A prenup nobody can locate during a divorce is barely better than no prenup at all.
Changing or Ending a Prenup Later
Prenups are not permanent unless the couple wants them to be. After the wedding, both spouses can amend or revoke the agreement at any time, but any change must be in writing and signed by both. One spouse cannot alter the terms alone, and verbal promises to change the agreement carry no legal weight. A new or substantially revised agreement signed after the wedding is called a postnuptial agreement.
Sunset Clauses
Some couples build in a sunset clause that ends the prenup automatically after a set period or when a specific event occurs. Common triggers include a particular anniversary, often the 10th or 20th, or a milestone like the birth of a child or a joint home purchase. The clause has to state precisely when the agreement expires; vague language like “after several years of marriage” is unenforceable. Most sunset clauses also carve out an exception: if a divorce action has already been filed or a separation agreement is in place when the sunset date arrives, the prenup stays in effect through the proceedings.
Tax Consequences Worth Flagging
Prenup terms can quietly change what the federal government takes at death and during the marriage. Three issues come up most often.
Federal law allows an unlimited deduction for property passing from a deceased spouse to the surviving spouse, which generally eliminates estate tax on those transfers.1Office of the Law Revision Counsel. 26 USC 2056 – Bequests, Etc., to Surviving Spouse If a prenup waives inheritance rights, the surviving spouse may not receive enough property to use that deduction, and the estate could face a larger bill. For 2026, the federal estate tax exemption is $15,000,000 per individual, so estates below that owe nothing regardless.2Internal Revenue Service. Whats New – Estate and Gift Tax For wealthier couples, the interaction between inheritance waivers and the marital deduction is worth running past a tax professional.
When one spouse dies without using the full exemption, the unused portion can transfer to the surviving spouse through portability, but only if the deceased spouse’s executor files an estate tax return electing it, even when no tax is owed. A well-drafted prenup can require the executor to make that election. Couples in second marriages should look closely here because of the “last deceased spouse” rule: if the surviving spouse remarries and the new spouse dies first, the previously ported exemption from the first marriage is lost.
Transfers between spouses who are both U.S. citizens are generally exempt from federal gift tax entirely under the unlimited marital deduction for gifts, and property transfers tied to a prenup usually fall under that protection.3Office of the Law Revision Counsel. 26 USC 2523 – Gift to Spouse When one spouse is not a U.S. citizen, gifts to that spouse are capped at $194,000 per year for 2026 before gift tax applies. Below that cap, the standard annual gift tax exclusion is $19,000 per recipient for gifts to anyone other than a U.S. citizen spouse.4Internal Revenue Service. Gifts and Inheritances
What a Prenup Costs
Attorney fees generally run from about $500 to $10,000, depending on the complexity of the couple’s finances and the local market for family law attorneys. A straightforward agreement for a couple with modest assets and no business interests sits at the low end. A family business, multiple properties, trust interests, or a significant cryptocurrency portfolio pushes the number up. Both spouses need their own attorney, so the total is roughly double whatever one lawyer charges. Notary fees are minimal. Measured against the cost of contested divorce litigation, the expense is almost always small.