Filing Status: All Five Options Explained

Single

Unmarried on December 31 and not qualifying for HoH or QSS. 2026 standard deduction $16,250. Brackets start at 10% and reach 37% at $626,350 of taxable income.

Married Filing Jointly (MFJ)

Married on December 31 (or spouse died during the year and you have not remarried). Combined income and combined deductions on a single return; both spouses are jointly and severally liable. 2026 standard deduction $32,500; brackets exactly double single up through the 32% bracket, then compress in the 35% and 37% brackets — producing the so-called marriage penalty for high-income dual earners.

Married Filing Separately (MFS)

Each spouse files a separate return. MFS is rarely tax-optimal at the federal level — many credits and deductions are reduced or unavailable (Earned Income Credit, education credits, student loan interest, traditional IRA deductibility if covered by a plan). MFS is sometimes chosen for liability separation (one spouse's tax debt or compliance risk), or for income-driven student loan repayment optimisation.

Head of Household (HoH)

Unmarried (or "considered unmarried" — living apart from spouse for the last six months of the year) AND maintaining a household that was the principal home for a qualifying person for more than half the year (a qualifying child OR a qualifying relative, per IRC §2(b)). 2026 standard deduction $24,500 and lower-bracket widths between single and MFJ. The qualifying-person test trips many taxpayers — a roommate's child is not a qualifying person.

Qualifying Surviving Spouse (QSS)

Available for the two tax years after the year the spouse died, provided you have a dependent child and have not remarried. Treats the surviving spouse as MFJ for brackets and standard deduction (IRC §2(a)) — a meaningful relief during a financially disrupted period.

Marriage penalty vs. marriage bonus

Two single filers earning roughly equal amounts often pay more federal tax filing as MFJ than as two singles — a penalty driven by compressed brackets at the top end and shared deduction thresholds. Two filers with very unequal incomes (e.g., one high earner + one non-earner) typically receive a bonus from MFJ because the higher earner's marginal rate drops as the joint brackets absorb their income.

Worked example: Priya and Jordan Walsh (Phoenix, AZ)

Married. Priya earns $190,000 W-2; Jordan is at home with two children, no income. They are evaluating MFJ vs MFS for 2026.

MFJ: AGI 190,000 − SD 32,500 = TI 157,500. Federal tax ≈ 24,943. MFS (Priya): AGI 190,000 − SD 16,250 = TI 173,750. Federal tax ≈ 35,206. MFS (Jordan): AGI 0 − SD 16,250 = TI 0. Federal tax 0. MFJ saves ≈ $10,263 + preserves dependent-child credits and IRA deductibility otherwise restricted under MFS.

Statute references

• Definition of head of household — IRC §2(b)
• Qualifying surviving spouse — IRC §2(a)
• Determination of marital status — IRC §7703

Related pages

• Standard vs Itemized Deductions Guide →
• QBI §199A Deduction Guide →
• Income Tax Calculator →