What to Know Before Getting a Prenup: A 2026 Guide

What Do You Need to Know Before Getting a Prenup?

The core requirements are straightforward: a prenup must be written, signed voluntarily by both parties, supported by full financial disclosure, and free of unconscionable terms. Each partner should also have their own attorney and enough time to review the agreement before the wedding.

This guide is for couples planning an agreement together. Whether you're combining two incomes, one partner owns a business, or you simply want to establish shared financial expectations, a prenup is a planning conversation, not a confrontational one. It creates alignment on topics that might otherwise go unaddressed until they become contentious.

What Is a Prenup and What Can It Cover?

A prenuptial agreement is a legally binding contract signed before marriage that sets the financial rules for your partnership, overriding whatever default property-division laws your state would otherwise apply. It takes effect when you marry.

What a prenup can address

• Separate vs. marital property. You can designate specific assets, like a home you bought before the relationship, as separate property that stays with the original owner.
• Business interests. If either partner owns a business, a prenup can clarify how ownership, growth in value, and decision-making are handled. Without one, many states treat value increases during the marriage as divisible marital property.
• Debts. You can assign responsibility for premarital debts (student loans, credit card balances) so the partner who incurred them remains responsible.
• Spousal support. Couples can set a fixed amount, create a formula tied to marriage length or income, include escalation clauses, or waive support entirely, though enforceability of support waivers varies by state.
• Retirement and employment benefits. Stock options, profit-sharing, pensions, and 401(k) contributions can all be addressed.
• Estate provisions. A prenup can coordinate with wills and trusts, designate life insurance beneficiaries, and allocate death benefits.

Community property vs. equitable distribution

Nine states follow community property rules: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin. In these states, most assets and debts acquired during marriage are treated as jointly owned and generally split 50/50 by default. The remaining 41 states and D.C. use equitable distribution, where a judge divides marital property based on what seems fair given factors like income, marriage length, and household contributions. "Equitable" does not always mean "equal," and the outcome can be unpredictable. A prenup can override the default rules in either system.

Prenups are not only for high-net-worth couples. If you have retirement benefits, real estate, a side business, student debt, children from a prior relationship, or if one partner plans to step away from a career to raise children, a prenup creates clarity about how those circumstances will be handled.

What Makes a Prenup Enforceable in 2026?

Courts evaluate a prenup through two lenses: procedural fairness (how the agreement was made) and substantive fairness (whether the terms are reasonable). An agreement that fails on either front can be thrown out.

All 50 states and D.C. recognize prenuptial agreements. About 29 states and D.C. have adopted a version of the Uniform Premarital Agreement Act (UPAA) or its 2012 update, the Uniform Premarital and Marital Agreements Act (UPMAA). States that haven't adopted a uniform act rely on their own domestic relations statutes or common law, but the enforceability principles are broadly similar.

What a Prenup Cannot Include

Courts draw firm lines around provisions that interfere with children's rights or public policy. No matter how carefully you draft them, certain clauses will not be enforced.

• Child custody. Judges decide custody based on the child's best interests at the time of separation. A prenup clause allocating custody years in advance will be disregarded.
• Child support. Support belongs to the child, not the parents. A prenup that limits or waives child support is unenforceable.
• Lifestyle and behavior clauses. Provisions that penalize infidelity, set weight requirements, or regulate personal conduct are generally unenforceable. In the many states that use no-fault divorce, these clauses conflict with public policy because they attempt to reintroduce fault-based grounds.
• Illegal or unconscionable terms. Any provision that violates the law or is so one-sided it shocks a court's conscience will be struck down.

If you want to include a provision you're unsure about, that's a strong signal to discuss it with a qualified attorney who knows your state's laws.

Why Full Financial Disclosure Matters

Full disclosure is the mechanism that proves both partners understood what they were agreeing to. Without it, a court may conclude that one party signed the prenup without knowing the full picture, and that alone can void the entire agreement.

What to disclose

• Bank and investment account balances
• Real estate and its approximate value
• Retirement accounts (401(k), IRA, pension)
• Outstanding loans and credit card debt
• Income documentation (pay stubs, tax returns, business revenue)
• Business ownership interests and valuations
• Expected inheritances, where applicable

Hiding assets or understating debts is one of the fastest ways to get a prenup thrown out. Courts take the position that you cannot knowingly agree to terms when you don't have the financial facts in front of you.

A party can waive the right to further disclosure in writing, but only after receiving a fair and reasonable baseline picture of the other partner's finances. In practice, more disclosure is almost always better. The goal is transparency, not a minimum checklist.

When to Start and How Timing Affects Your Prenup

Starting the prenup process well before the wedding is one of the most practical things you can do for enforceability. Adequate review time is a factor courts consider, and agreements presented or signed days before the ceremony face serious scrutiny.

As Michael C. Cotugno, Esq., Managing Partner of Neptune Legal, puts it: "The initial outreach for a premarital agreement is an invitation, not a demand."

Bringing up the conversation early, ideally several months out, gives both partners time to:

1. Discuss financial goals, concerns, and expectations together.
2. Gather documents (account statements, tax returns, business records).
3. Each retain independent counsel and get legal advice.
4. Draft, review, negotiate, and revise terms without time pressure.
5. Complete full financial disclosure.
6. Sign the final agreement with confidence.

Sunset clauses and periodic updates

Some prenups include a sunset clause that causes the agreement to expire after a set period, such as seven or ten years of marriage. Some states have their own sunset provision laws that phase out or end a prenup after a certain duration or life event, like a child's birth. As with your estate plan, you should revisit your prenup every few years to make sure it continues to reflect both of your wishes and your current financial and personal circumstances. You can agree in writing to extend or modify the agreement.

Do You Need a Lawyer, and What Does a Prenup Cost?

Most states do not technically require each party to have their own attorney, but the absence of independent counsel is a consistent red flag for judges reviewing the agreement later. When one lawyer drafts the document and only one side gets legal advice, the other spouse has a much stronger argument that they did not fully understand what they signed.

Independent counsel for each partner is highly recommended for an enforceable prenup. Each attorney advocates for their own client's interests, explains the legal and financial implications of every clause, and helps ensure the final agreement meets state-specific requirements.

Neptune's lawyer-led approach

Neptune offers a lawyer-led online prenup where each party selects their own independent attorney from the Neptune network. Because each partner has separate legal representation, the process supports both fairness and enforceability. Neptune is not a DIY template service; the agreements are drafted and reviewed by licensed attorneys.

Market costs

Prenup costs vary widely depending on complexity, jurisdiction, and what's at stake. Key distinctions to keep in mind:

• Per-attorney vs. couple total. Many cost estimates reflect a single attorney's fee. If each partner hires their own lawyer, multiply accordingly.
• Drafting vs. review. Drafting a prenup from scratch typically costs more than reviewing an existing draft.
• Business valuations. If either partner owns a business, a professional valuation can cost between $1,500 and $30,000 depending on the business's complexity.

Because state requirements and individual circumstances vary so much, treat any cost estimate as a starting range rather than a fixed number. Consulting with an attorney in your jurisdiction gives you the most accurate picture.

Step-by-Step Checklist for Getting a Prenup

Here's an ordered sequence from first conversation to final signature. Steps marked with an asterisk (*) typically require a qualified attorney or your state's specific legal guidance.

1. Have the conversation together. Discuss your goals, concerns, and what you each want the agreement to address. Approach it as a shared planning exercise.
2. Gather your financial documents. Collect account statements, tax returns, property records, loan balances, business records, and retirement account summaries.
3. Each retain independent counsel.* Each partner should hire their own attorney. An attorney who knows your state's prenup laws can advise on what's enforceable and what isn't.
4. Complete full financial disclosure.* Exchange comprehensive financial information with your partner. Your attorneys can help ensure nothing is missed.
5. Draft the agreement.* Typically, one attorney prepares an initial draft based on the couple's shared goals and that client's priorities.
6. Review, negotiate, and revise.* The other partner's attorney reviews the draft, proposes changes, and both sides negotiate until both partners are satisfied.
7. Allow adequate review time. Neither partner should feel rushed. Give yourselves enough time to ask questions, sleep on decisions, and consult with financial advisors if needed.
8. Sign well before the wedding.* Both partners sign the final agreement voluntarily, without pressure, and ideally not on the eve of the ceremony. State-specific drafting matters, so confirm notarization or witness requirements in your jurisdiction.
9. Store securely and revisit periodically. Keep the original in a safe place. Plan to review the agreement every few years or after major life events (a child's birth, a career change, a move to a new state).

State requirements vary. A prenup drafted for a couple in California will not necessarily work for a couple in New York without adjustments, so jurisdiction-specific legal guidance is essential.