LGBTQ+ Prenuptial & Cohabitation Agreements: A Financial Planning Guide

For most couples, a prenuptial agreement is about protecting pre-existing assets. For LGBTQ+ couples, it's also about defining what "pre-existing" means when your legal marriage date might be years or decades after your relationship began, when your state may not have recognized your domestic partnership, and when federal law still treated you as strangers for tax and benefits purposes until 2015. This guide covers the financial dimensions unique to LGBTQ+ households.

1. The LGBTQ+ Complexity That Changes Everything

Most prenuptial agreement guides assume that "before the marriage" and "before the relationship" are roughly the same date. For same-sex couples married post-Obergefell, they often aren't — by years or decades.

The Supreme Court's decision in Obergefell v. Hodges (June 26, 2015) nationalized same-sex marriage rights. Couples who had been together for 10, 20, or 30 years suddenly had a legal marriage date of 2015 (or whatever year they formalized). This creates a specific financial planning question: are the assets accumulated during those pre-Obergefell years marital property or separate property?

The answer varies by state and depends on how the agreement is drafted. Some states treat the marriage date as a hard line regardless of relationship history. Others allow the agreement to designate a "relationship commencement date" that supersedes the legal marriage date for purposes of defining separate property. A financial advisor can help you model the dollar impact of each approach; only a licensed attorney in your state can tell you which approach the courts there will enforce.

2. Prenuptial Agreements for Same-Sex Couples

What a prenup does and doesn't do

A prenuptial agreement is a contract that defines how assets and debts are characterized and divided if the marriage ends — by divorce or death. It can establish that specific assets stay separate, define how marital assets accumulate going forward, set spousal support terms, and override state default rules on property division. What it cannot do: waive child support obligations, override ERISA-protected retirement account rights (see below), or resolve child custody — courts decide those regardless of what the agreement says.

LGBTQ+-specific clauses worth considering

• Relationship commencement date. Designate explicitly when your financial partnership began — especially if you co-mingled finances, purchased real estate, or accumulated retirement assets before your legal marriage. Courts in some states will honor this date for purposes of defining what is and isn't marital property; others won't. Know your state's rules before drafting.
• Pre-Obergefell domestic partnership assets. If you held a state-recognized domestic partnership or civil union before marrying, specify whether those assets are treated as separate property or marital property under the prenup. A couple who contributed equally to a brokerage account since 2006 under a California DP registration has different equities than a couple who just started living together.
• Prior marriage recognition. Some same-sex couples married legally in one state (e.g., Massachusetts in 2004) and moved to a state that refused to recognize the marriage until Obergefell. The legal status of the "gap years" is a potential source of dispute in a divorce proceeding. The prenup can address whether assets accumulated during the gap are treated as marital or separate.
• Bi-national couples. If one partner is not a U.S. citizen, the prenup should address foreign assets and any foreign law that might claim jurisdiction. Note that a prenup does not create or extinguish immigration rights — a green card through marriage is not waivable via prenuptial agreement, and signing a prenup does not affect USCIS processing. However, foreign asset disclosure matters for both estate planning and tax compliance (FBAR, FATCA).
• Name and identity. If one partner has transitioned or plans to transition, include provisions that account for legal name changes and ensure the agreement remains enforceable under all names a party uses. This is procedural but important for enforcement.

The ERISA trap — retirement accounts are NOT fully prenup-able

This is the most commonly missed issue in LGBTQ+ prenuptial planning, and it applies to all married couples — but same-sex couples who married after years of accumulating retirement assets are especially exposed.

Under ERISA Section 205 and IRC § 417, defined benefit pension plans and most 401(k) plans must pay a "qualified joint and survivor annuity" (QJSA) to a surviving spouse unless the spouse formally waives the right — after the marriage begins, using the plan's specific consent procedures, with a plan representative's signature.¹ A prenuptial agreement executed before the marriage cannot waive these ERISA rights. The waiver must happen post-marriage, through the plan's official process.

What this means practically: if your prenup says "each party retains their own retirement accounts separately," that clause may be unenforceable for ERISA-covered employer plans. The surviving spouse retains survivor-benefit rights regardless of what the prenup says. If you want to modify retirement account survivorship arrangements, you need to file the appropriate QJSA/QPSA waiver form with the plan after marrying — not just rely on the prenup.

IRAs are different. IRAs are not subject to ERISA Section 205; the beneficiary designation on an IRA controls, and you can designate anyone. For IRA accounts, the prenup can address intent, but the beneficiary designation form is what actually determines distribution — and it overrides whatever the will or prenup says. For LGBTQ+ households, making sure IRA beneficiary designations match the estate plan intent is critical. See our Estate Planning for Chosen Families guide.

The financial advisor's role in prenup planning

An attorney drafts the prenup. A financial advisor helps you understand what you're agreeing to financially. Before signing:

• Asset and liability inventory. Each party discloses their full financial picture — accounts, real estate, business interests, debts, expected inheritances. Most prenups are challenged on the basis of inadequate disclosure. A financial advisor can help you assemble and document this completely.
• Modeling the split scenarios. If the prenup defines separate property as "all assets accumulated before the legal marriage date," a financial advisor can run out what that actually means in dollar terms at three different future points in time — two years from now, ten years, twenty years. Understanding the financial consequences of the clause you're signing is not the same as reading the clause.
• Tax implications of proposed property division. Under IRC § 1041, transfers of property between spouses incident to divorce are generally tax-free.² For domestic partners who never legally married, property transfers at separation are not protected by § 1041 — they're treated as sales, which may trigger capital gains. The prenup's characterization of the relationship affects the tax treatment of any future property division.

3. Cohabitation Agreements for Domestic Partners

If you and your partner live together without a legal marriage or registered domestic partnership, state default rules on property division do not apply to you. This is a double-edged reality: you're not automatically subject to community property or equitable distribution rules, but you also have no legal framework to fall back on if the relationship ends or one partner dies. A cohabitation agreement fills that gap.

What to include

• Property characterization. Which assets are each person's separate property? Which are jointly held? If you each bring in separate savings and combine them in a joint account, do those contributions remain separate or do they become shared?
• Contribution tracking. For major shared assets — particularly a home — document who contributed what to the down payment and what the ongoing cost-sharing arrangement is. See the LGBTQ+ Homebuying guide on co-ownership agreements for the real-estate-specific version of this.
• Income and expense sharing. Is income pooled? Do both partners contribute equally to household expenses, or in proportion to income? What happens if one partner loses a job or stops working?
• Separation provisions. How are jointly-held assets liquidated or bought out if the relationship ends? A clear buyout formula and dispute resolution mechanism saves significant legal cost later.
• Death provisions. A cohabitation agreement cannot substitute for a will, trust, healthcare directive, or beneficiary designation — but it can document intent. Without a will and beneficiary update, an unmarried partner typically receives nothing under state intestacy laws. The agreement should explicitly state this limitation and require both parties to execute estate planning documents (will, trust, healthcare proxy, financial POA, beneficiary designations) as a condition of the agreement's effectiveness.
• Amendment and termination. What happens if you get legally married, register as domestic partners, or formally dissolve the relationship? The agreement should specify whether it survives, modifies, or terminates on each of these events.

4. Post-Nuptial Agreements for Pre-Obergefell Couples

If you married in June 2015 or shortly after and didn't do financial planning documents at the time, a post-nuptial agreement can address the same issues a prenup would have — the characterization of pre-marriage assets, the ERISA waiver for any retirement accounts, and the disposition of assets accumulated before the legal marriage began.

Post-nuptial agreements are generally enforceable in most states, though courts scrutinize them more carefully than prenups because there is less incentive for full disclosure once the parties are already married. Both parties having independent legal counsel and a complete, documented financial disclosure is especially important.

A post-nuptial review also prompts a full estate document audit — confirming that wills, trusts, beneficiary designations, healthcare directives, and POAs all reflect the current relationship and family structure. Many same-sex couples who married quickly post-Obergefell still have estate documents that reflect the pre-marriage structure or, worse, that were never updated. See Estate Planning for Chosen Families for the complete document checklist.

5. Protecting the Financially Vulnerable Partner

In many same-sex households, one partner may have taken time out of the workforce for caregiving, supported the other through school or a business launch, or accumulated fewer retirement assets due to the historical wage gap or discrimination in their industry. Prenuptial and post-nuptial agreements can address this asymmetry deliberately.

• Spousal support (alimony) provisions. Under TCJA's alimony rules, alimony paid under a divorce agreement executed after December 31, 2018, is not deductible by the payer or taxable to the recipient.³ Prenuptial agreements can pre-specify spousal support amounts and terms, but since alimony is no longer tax-driven, the focus shifts to ensuring adequate economic protection. A financial advisor can model what a surviving spouse or lower-earning divorced partner actually needs to maintain their lifestyle.
• Retirement account equalization. If one partner spent five years as a stay-at-home parent and has significantly lower 401(k) balances, the agreement can address how retirement asset splits are equalized — but again, ERISA requires formal post-marriage waiver procedures for employer plans, not just agreement language.
• Non-biological parent protections. In households with children where only one partner is a legal parent, the non-legal parent's economic claims at divorce or death are precarious without explicit planning. A prenup or cohabitation agreement can address financial support for children and the caretaking parent, even when custody itself must be determined by the court. Second-parent adoption is the most robust protection — see our Adoption Planning guide.

6. The Intersection with Estate Planning

A prenup or cohabitation agreement and an estate plan serve overlapping but distinct functions. The prenup governs what happens if the relationship ends during your lifetimes. The estate plan governs what happens at death. For LGBTQ+ households, both need to account for each other — a prenup that declares certain assets separate property needs to be matched by estate documents that actually leave those assets to the intended beneficiaries, because "separate property" under a prenup doesn't automatically override intestacy or a stale beneficiary form.

The complete document stack for a same-sex married couple or domestic partner household includes:

1. Prenuptial or post-nuptial agreement (or cohabitation agreement for DP)
2. Revocable living trust (avoids probate, names beneficiaries explicitly)
3. Pour-over will (catches any assets not titled in the trust)
4. Durable financial power of attorney
5. Healthcare proxy / durable healthcare power of attorney
6. HIPAA authorization form
7. Beneficiary designation review across all accounts (IRA, 401k, life insurance, brokerage)
8. Disposition of remains directive

For households with non-biological children, second-parent adoption — the legal process that establishes both partners as legal parents — is the most important additional step. Without it, the non-legal parent has no automatic claim to custody, inheritance, or Social Security survivor benefits for those children. No estate document can fully substitute for it.

7. Finding the Right Professionals

A prenuptial or cohabitation agreement is a legal document; you need a licensed attorney in your state — and each party should have independent counsel. Using one attorney for both parties is a conflict that can invalidate the agreement in court. The financial planning side — modeling the scenarios, running the asset inventory, understanding the tax treatment — is where a fee-only financial advisor who specializes in LGBTQ+ households adds value. The two professionals work together, not in isolation.

When evaluating an attorney, ask specifically about their experience with same-sex couples and domestic partnerships, pre-Obergefell asset issues, and ERISA retirement account waivers. When evaluating a financial advisor, see our How to Find an LGBTQ+-Affirming Financial Advisor guide — the same questions apply to attorneys.