Tax Considerations for Same-Sex Couples

Navigating Taxes as a Same-Sex Couple

Married same-sex couples have had identical federal tax treatment since Windsor and Obergefell. The complications that remain are not about recognition — they are about what happens when two similar, high W-2 incomes get stacked in one return, and about the years before a marriage when planning was done separately.

Filing status: joint is usually right, but check

Married filing jointly beats separately in most cases. The exceptions matter, though:

• Income-driven student loan repayment. Filing separately can dramatically lower a payment based on one income. Run both scenarios; the loan savings sometimes exceed the tax cost.
• Large medical expenses for one spouse, where the 7.5% of AGI floor is easier to clear on a smaller separate income.
• Liability concerns where one spouse has a complicated or contested return.

Filing separately also disqualifies you from several credits and caps IRA deductibility hard, so it is rarely the default answer.

The marriage penalty is the main event

Federal brackets are doubled for joint filers up through the 32% bracket, then compress. Two partners each earning $250,000 land in territory where the joint brackets are less generous than two single returns would be, and several thresholds do not double at all:

• The 3.8% net investment income tax starts at $200,000 single but only $250,000 joint.
• The 0.9% additional Medicare tax works the same way.
• Roth IRA and several credit phase-outs compress on a joint return.
• State brackets in California, New York, and Oregon compound the effect.

This does not mean don't marry. It means the tax cost of marrying should be a known number rather than a surprise the following April, and it should be weighed against the enormous estate, Social Security, and healthcare advantages marriage brings.

What changed under the 2025 tax law

The One Big Beautiful Bill Act made the 2017 rate structure permanent and adjusted several items that matter to high-earning couples:

• The SALT deduction cap rose to $40,000 for 2025 with modest annual increases, but it phases down for higher incomes — for many two-income coastal couples the benefit shrinks or disappears exactly where property and state income taxes are highest.
• The standard deduction remains large and indexed, making itemizing worthwhile mainly for couples with a mortgage plus meaningful charitable giving.
• Estate and gift exemptions were set at $15 million per person for 2026, which removes federal estate tax from the picture for nearly all married couples and shifts the focus to state-level exposure.
• Qualified small business stock rules were expanded, which is relevant for couples with startup equity.

Strategies that actually move the number

1. Coordinate both benefit elections as one decision. Two 401(k)s, two HSAs, two ESPPs, and two sets of open-enrollment choices should be optimized jointly — including which spouse's health plan covers both of you.
2. Bunch charitable giving into alternating years, ideally through a donor-advised fund, so you itemize meaningfully in one year and take the standard deduction in the next.
3. Give appreciated shares, not cash. You skip the capital gain and still deduct fair market value.
4. Harvest losses across both taxable accounts — and watch wash sales between spouses, since the IRS treats you as one taxpayer for that rule.
5. Place assets by account, not by owner. Bonds and REITs in tax-deferred accounts; broad equity index funds in taxable.
6. Use the PTE election if either of you has pass-through business income in a state that offers it — it is one of the few remaining workarounds to the SALT cap.
7. Fix the withholding. Two W-4s that each assume a single earner is the most common source of a five-figure April surprise.

Community property and state-level wrinkles

California, Washington, Texas, and other community-property states change how income and basis are treated — including a full step-up in basis on the entire community share at the first death, which is a meaningful advantage. If you moved states mid-year, married mid-year, or hold property in more than one state, the return deserves a professional's eyes.

Where planning beats preparation

A tax preparer records what already happened. Planning changes what happens next: when equity vests, when you convert to Roth, when you give, and how you title assets. If you want the 2026 numbers modeled against your actual pay stubs, book an intro call.