Prenups and postnups: financial planning, not divorce planning

The prenuptial agreement has a marketing problem. It's framed as planning for divorce, so asking for one feels like betting against the marriage. The more accurate frame: every married couple already has a prenup — the default one written by their state legislature, applied by a judge who's never met them, at the worst moment of their lives. A negotiated prenup simply replaces that default with rules the two of you chose while you still liked each other. That's not pessimism. It's the same logic as a will.

What a prenup can actually do

• Define separate property: assets each person brings in — a house, a business, retirement savings, a future inheritance — stay separate, including (if you say so) their growth during the marriage.
• Protect a business: keep a company and its appreciation out of the marital estate, sparing it from valuation fights and forced buyouts that can kill an operating business.
• Set alimony terms: waive it, cap it, or define a formula — subject to limits; courts won't enforce terms that leave a spouse destitute.
• Wall off each other's debts: student loans, business liabilities, or a partner's pre-existing debt stay with the person who incurred them.
• Protect children from a prior marriage: ensure assets intended for your kids aren't rerouted by default marital property rules.
• What it cannot do: decide child custody or child support (courts always retain that power), require personal behavior, or enforce anything a judge finds unconscionable.

What makes one enforceable

1. Full financial disclosure from both sides. Hiding an account or lowballing a business is the number one way prenups get thrown out years later.
2. Independent lawyers for each person. One shared attorney — or one side with no attorney — is a red flag courts look for.
3. Time. A prenup presented two weeks before the wedding invites a coercion challenge. Start the conversation six months out; sign at least 30 days before the date.
4. Fundamental fairness. Courts don't require equal terms, but agreements that are grotesquely one-sided, especially measured at the time of divorce, get struck down.
5. Proper execution: written, signed, witnessed or notarized per your state's rules. Oral prenups are campfire stories, not contracts.

Postnups: the same tool, after the wedding

A postnuptial agreement does the same job, signed during the marriage. Common triggers: one spouse starts or inherits a business, an inheritance arrives, one spouse leaves a career to raise kids and wants their contribution protected, or the couple hits financial conflict and wants to rebuild trust with terms in writing rather than resentment in silence. Postnups face slightly more judicial scrutiny than prenups — spouses owe each other fiduciary duties, so fairness and disclosure standards are higher — but they're enforceable in most states when done properly. For a couple who skipped the prenup, a postnup after a major financial change is the second-best time to plant the tree.

The conversation is the actual benefit

Couples who negotiate a prenup are forced to do, before the wedding, what most couples never do at all: disclose everything, name expectations about money, careers, kids, and support, and agree on what fairness means to them. Financial conflict is one of the most reliable predictors of divorce, and the prenup process is effectively structured financial premarital counseling with a binding output. Plenty of couples report the negotiation was uncomfortable for a week and clarifying for a decade. If the conversation itself destroys the relationship, the conversation didn't cause the problem — it found it early, at the cheapest possible moment.

The enforceability timeline

1. 1
   6+ months before the wedding

   Raise the topic, exchange complete financial disclosures, and each retain your own attorney. Early conversations read as planning; late ones read as coercion.

2. 2
   3 months out

   Negotiate terms and trade drafts. This is where the real premarital counseling happens — expectations about money, careers, and support get named in writing.

3. 3
   At least 30 days before

   Sign the final agreement, witnessed or notarized per state law. The signing-date buffer is your best defense against a duress challenge later.

4. 4
   Every few years after

   Maintain it: keep separate property separately titled, avoid commingling, and revisit the terms after kids, inheritances, business changes, or a move to a new state.

The bottom line

A prenup or postnup is the cheapest, calmest financial agreement you will ever negotiate about the most expensive, angriest dispute you might ever have. Full disclosure, separate lawyers, plenty of runway, fair terms — and then maintain it. Couples who never divorce lose nothing but the drafting fee. Couples who do divorce save multiples of it, in money and in scar tissue.