Tax Guide for LGBTQ+

Filing Status After Obergefell: MFJ, MFS, and the Marriage Penalty/Bonus

Following Obergefell v. Hodges, 576 U.S. 644 (2015), all 50 states and the federal government recognize marriages between same-sex couples for all purposes, including taxation. Married same-sex couples choose between Married Filing Jointly (MFJ) and Married Filing Separately (MFS) — the same choice available to all married couples. There is no longer any legal distinction in tax treatment between same-sex and opposite-sex marriages.

The MFJ versus MFS decision is primarily financial. MFJ combines both spouses' income on a single return and applies the MFJ tax brackets, standard deduction ($32,200 for 2026), and credit phase-outs. MFS splits income into two separate returns with narrower brackets and lower phase-out thresholds. In the vast majority of cases, MFJ produces lower total tax — often significantly lower when one spouse earns substantially more than the other.

For dual-income couples where both spouses are self-employed, the "marriage penalty" can surface in specific situations. The MFJ brackets are not simply double the Single brackets at every level: the 32%, 35%, and 37% brackets begin at income levels less than double the Single thresholds. Two single filers each earning $200,000 pay less total federal tax than the same two people filing MFJ at $400,000 combined. However, the standard deduction, CTC phase-out, and EITC eligibility are more generous under MFJ, so the net effect depends on the specific income combination.

For couples where one spouse has self-employment income and the other has W-2 income, MFJ is almost always beneficial. The W-2 spouse's withholding helps cover the estimated tax obligations of the SE spouse. The QBI deduction is calculated on the combined return, and the phase-out threshold for the QBI limitation is $383,900 for MFJ (versus $191,950 for Single or MFS). This means high-earning couples can claim the full 20% QBI deduction at income levels that would trigger limitations for MFS filers.

All legally married couples — including same-sex couples — choose between MFJ and MFS. MFJ almost always produces lower combined tax. The QBI phase-out threshold doubles under MFJ. (Obergefell v. Hodges, 576 U.S. 644 (2015); IRC Section 1(a) (MFJ rates); IRC Section 199A(e)(2) (QBI threshold for MFJ); IRC Section 63(c)(2)(B) (MFJ standard deduction))

Adoption Credit and Family Formation Expenses

The Adoption Credit under IRC Section 23 provides a non-refundable credit for qualified adoption expenses, up to $17,280 per eligible child for 2026. Qualified expenses include adoption fees, court costs, attorney fees, travel expenses directly related to the adoption, and other expenses directly related to the legal adoption of a child. For adoptions of children with special needs (as defined by the state), the full $17,280 credit is available regardless of actual expenses incurred.

The credit phases out for taxpayers with Modified AGI between $259,190 and $299,190 (2026 estimates). It is non-refundable, meaning it can reduce tax to zero but does not generate a refund — however, unused credit carries forward for up to five years. For a couple adopting a child with $15,000 in legal and agency fees, the credit covers the full $15,000. If their tax liability for the year is only $8,000, the remaining $7,000 carries forward to the next year.

For LGBTQ+ families, adoption is one of the most common paths to parenthood, and the Adoption Credit is directly relevant. Second-parent or stepparent adoptions — where one spouse legally adopts the other spouse's biological or previously adopted child — also qualify for the credit if there are qualifying expenses. The adoption must be legal and final for the credit to be claimed.

Surrogacy expenses, by contrast, do NOT qualify for the Adoption Credit. The IRS has ruled that surrogacy arrangements are not adoptions within the meaning of Section 23, even when the intended parents are listed on the birth certificate. Medical costs associated with surrogacy (IVF, prenatal care, delivery) are deductible as medical expenses on Schedule A if you itemize and if the expenses exceed 7.5% of AGI — but this is the medical expense deduction, not the adoption credit, and it requires itemizing. Legal costs for establishing parental rights in a surrogacy arrangement are personal legal expenses and are generally not deductible.

Employer-provided adoption assistance (up to $17,280 for 2026) is excluded from the employee's gross income under IRC Section 137. If one spouse has W-2 employment with an adoption assistance program and the couple also has SE income, the exclusion reduces W-2 income while the SE income is separately calculated. The exclusion and the credit cannot apply to the same expenses — but if total expenses exceed $17,280, the excess can be claimed under whichever provision the first tranche was not claimed under.

The Adoption Credit covers up to $17,280 per child in qualified adoption expenses. Surrogacy expenses do not qualify for the adoption credit but may qualify as medical expenses on Schedule A. (IRC Section 23 (Adoption Credit); IRC Section 137 (adoption assistance exclusion); IRS Publication 968 (Tax Benefits for Adoption))

Name Changes, Gender Marker Updates, and Tax Filing

Transgender and non-binary individuals who change their legal name or gender marker face a specific procedural requirement for tax filing: your name and Social Security Number on your tax return must match the records held by the Social Security Administration. If you file with a name that does not match your SSA records, the IRS's matching system may reject your return or delay your refund.

The process is: (1) obtain a legal name change through your state's court system, (2) update your name with the Social Security Administration using Form SS-5, (3) file your tax return using your new name and existing SSN. You do NOT need to file amended returns for prior years — your past returns were filed correctly under your legal name at the time. You do not need to notify the IRS separately; the SSA and IRS records synchronize automatically.

For gender marker changes, the SSA allows you to update your gender marker with a self-attestation statement (no medical documentation required since 2022). The IRS does not use gender markers for tax processing — your SSN and name are what matter. Changing your gender marker at the SSA does not trigger any tax consequence or require any tax filing action.

If you changed your name mid-year and need to file estimated taxes, use whichever name currently matches your SSA records for that quarterly payment. If your name change at SSA is still processing when a quarterly payment is due, use your old name to avoid a mismatch. Once the SSA update is complete, file your annual return with your new name.

For married couples where one spouse changes their name, the same principle applies: update with SSA first, then file with the updated name. If both spouses' names are on the return (MFJ), each name must independently match the corresponding SSN at SSA. There is no mechanism for the IRS to associate a "former name" with a return — they simply match name-to-SSN, and the name must be current at the time of filing.

Your name on your tax return must match SSA records. Update your name at SSA before filing with the new name. No amended returns needed for prior years filed under your previous legal name. (IRC Section 6109 (identifying numbers); SSA POMS RM 10212.200 (name changes); Treas. Reg. 301.6109-1 (TIN requirements))

Unmarried Domestic Partners: Filing as Individuals

Unmarried domestic partners — regardless of whether they are registered as domestic partners in their state — cannot file a joint federal return. Federal tax law recognizes only legal marriage (as defined by state law) for MFJ filing. Domestic partnerships, civil unions (in states that still have them), and cohabitation do not qualify. Each partner files as Single (or Head of Household if they have a qualifying dependent).

This creates both disadvantages and a specific advantage. The disadvantage: two unmarried partners cannot combine their income for the purpose of lower MFJ brackets when one earns significantly more than the other, cannot easily pool deductions, and face separate standard deduction limits. The advantage: because they file as separate individuals, each partner's credits and deductions are independent. Two single filers each earning $100,000 may pay less total federal tax than a married couple filing jointly at $200,000, because they each get the full Single bracket widths without the marriage penalty at higher income levels.

For domestic partners with children, only one partner can claim a child as a dependent on their return. The partner who is the biological or legal parent typically claims the child. If both partners are legal parents (through adoption or by operation of state law), the partner with whom the child lived for more than half the year claims the child — the same custodial parent rules that apply to unmarried opposite-sex parents. The partner who claims the child can file as Head of Household.

Community property rules add a complication in nine states (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin) and in states that recognize registered domestic partnerships with community property treatment. In California and Washington, registered domestic partners must each report half of combined community income on their federal return. Nevada registered domestic partners may have similar requirements. This creates a de facto income-splitting effect for registered domestic partners in community property states — an unusual interaction that does not exist for unmarried couples in common-law states.

Unmarried domestic partners file as Single (or HOH with qualifying dependents). Community property rules in some states may require income splitting between registered domestic partners. (IRC Section 6013(a) (joint returns limited to husband and wife); IRC Section 1(c) (Single rates); IRS Chief Counsel Advice 201021050 (community property and registered domestic partners))