Do You Need a Prenup? A 2026 Decision Guide for Couples

When you need a prenup

You likely need a prenup if you or your partner have any of these at the time of marriage:

• Meaningful premarital assets: a home, brokerage accounts, retirement plans, business interests, or family inheritance that was acquired before the marriage and should stay separate.
• Vesting equity: RSUs, options, or other equity grants that vest during the marriage. The characterization of that equity (separate vs marital, treatment of premarital appreciation, treatment of liquidity events) is decided by the prenup.
• Family wealth or expected inheritance: the prenup documents how family assets and inheritance are protected and what happens if they pass to the couple during the marriage.
• A business: a closely-held business, a startup with a cap table, or any operating business that pre-exists the marriage. The prenup characterizes the business interest and any appreciation during the marriage. Per the AAML data, protection of separate property (78%) and inheritance rights (42%) are the most-cited reasons couples get prenups.
• A second marriage or children from a prior relationship: the prenup documents how prior-relationship commitments (assets earmarked for prior children, inheritance plans) are protected.
• Significant income differential: where one partner earns substantially more than the other and the income characterization matters. This ties directly to the spousal support/alimony question, which 74% of AAML attorneys cite as a top-three prenup topic.

When you might not need a prenup

You may not need a prenup if:

• Neither partner has meaningful premarital assets: both are early in careers, no real estate, no significant brokerage or retirement accounts, no vesting equity, no business interests.
• Both partners are comfortable with the state's default property division rules: community property in CA, TX, and seven other states; equitable distribution in NY, MA, and most others.
• The financial picture going in is simple and is expected to stay simple: no expected inheritance, no business plans, no pre-IPO equity.

For couples in these situations, the default state rules typically produce reasonable outcomes. A prenup adds a document and a cost without changing the substantive result.

State default rules in 2026

The state's default property division rules in 2026 vary materially across jurisdictions. The most common live markets:

• California (community property): assets and income acquired during the marriage are community property and divided 50/50 in a divorce. Premarital assets are separate property. Appreciation on separate property during the marriage may become community based on factors like commingling or active management. CA also has a 7-day rule under Family Code Section 1615(c)(2) for prenup execution.
• New York (equitable distribution): assets acquired during the marriage are marital property and divided equitably (not necessarily 50/50) in a divorce. Premarital assets are separate property. NY uses DRL Section 236(B)(3) for prenup enforceability.
• Massachusetts (equitable distribution): assets are divided based on a broader fairness standard that can include premarital assets in some cases. MA uses the DeMatteo two-look standard.
• Texas (community property): similar to California, community property for assets acquired during the marriage. TX uses Family Code Chapter 4 (TUPAA) for prenups.
• Florida (equitable distribution): marital assets divided equitably; premarital assets separate.
• Illinois (equitable distribution): marital assets divided based on multiple factors.

Per Cornell LII, prenups have been recognized in every state, though the enforceability standards differ. The default rules produce different outcomes than a prenup might. Whether the default outcome is acceptable depends on the couple's specific situation.

How to think about the decision

For a couple deciding whether they need a prenup in 2026, the three questions to work through are:

1. What are each partner's assets at the time of marriage? If meaningful, the prenup is the document that protects them.

2. What does each partner expect to acquire during the marriage? Vesting equity, business interests, inheritance, real estate. The prenup characterizes these in advance.

3. What is the cost of the prenup compared to the assets at stake? A $5,000 prenup for a couple with $200,000 in combined premarital assets is small relative to what the document protects. A $5,000 prenup for a couple with $5,000 in combined assets is harder to justify on cost alone.

If the answer to questions 1 and 2 is "meaningful," the prenup is usually the right move. If both are "minimal," the prenup may be optional. The framework is not "everyone needs a prenup" and it is not "nobody needs a prenup"; it is "here is how to decide."

Common objections to prenups

Several common objections to prenups come up in real conversations:

• "It will hurt the relationship to talk about money before the wedding." This is a real concern. The counter is that the conversation is happening anyway, just implicitly. Making it explicit through a structured prenup process often clarifies things rather than complicates them.
• "We don't have enough to make it worth it." True for some couples (early career, no significant assets). For couples with vesting equity or a premarital home or business, the math typically tilts the other way.
• "It feels like planning to fail." A prenup is a contingency plan, like a will or an insurance policy. It does not increase the probability of the contingency. This is where the UPAA framework shift in the early 1980s matters: courts now treat prenups as legitimate contract planning rather than as evidence of bad faith.
• "My partner is offended by the suggestion." This sometimes happens. The right move is usually to have the conversation directly about why the prenup is being considered and what it would actually cover. Many couples find that the conversation itself clarifies the relationship.
• "We don't have time before the wedding." California requires the final agreement to be presented at least seven calendar days before signing. Other states have similar timing rules. Practically, the process should start three to four months before the wedding.

What the AAML data says about who signs prenups now

The 2016 AAML survey showed a meaningful uptick in prenup adoption that has continued into 2026. The three most-covered prenup topics per the AAML data:

• Protection of separate property (78%): for premarital assets that should stay separate.
• Alimony / spousal maintenance (74%): where one partner's earning trajectory diverges from the other's.
• Division of property (68%): how marital assets are characterized and divided if the marriage ends.

The uptick is heaviest among millennials (51% of AAML attorneys report an increase specifically in that demographic). The core drivers cited: couples marrying later (later career, more assets), higher rates of dual-earner households with independent asset accumulation, and increased visibility of prenups in the broader culture.

What if we already got married?

If the wedding has already happened, the prenup window is closed. The during-marriage equivalent is a postnup, sometimes called a postnup. Postnups are generally harder to enforce than prenups because the wedding deadline that pushes the prenup conversation forward is gone. But a properly drafted postnup is still better than ambiguity.

Couples who often benefit from a postnup:

• Couples whose financial picture changed materially after the wedding (a liquidity event, a major asset acquisition, a change in income).
• Couples who married without a prenup and now want to formalize asset characterization.
• Couples planning for a near-term liquidity event where the prenup window is gone but the structuring need is real.

Neptune offers postnups on the same couple-first, flat-fee model as prenups.

How Neptune fits

Neptune's $5,000 flat-fee prenup is built for the most common couple shape: dual-career, some vesting equity or initial asset accumulation, planning to marry in the next 6 to 12 months. Both partners get state-licensed family law attorneys. AI-led intake plus synchronous attorney drafting and negotiation. Two to four weeks from start to signed document.

For couples whose situation is more complex (multi-entity business structures, contested negotiation, litigation posture), Neptune refers to a traditional matrimonial firm.

Related guides

• Prenup Timing Guide
• Prenup vs Trust
• How to Discuss a Prenup