Choosing the Right Filing Status

Your filing status is the first choice on a federal return, and it quietly sets almost everything after it: which bracket table applies, how large your standard deduction is, and whether you can claim many credits at all. Most people never think about it because their status seems obvious. But a marriage, a divorce, a death in the family or a child moving in can change it, and some households have a real choice to make. This chapter explains the five statuses, how each changes the numbers, and when the less obvious option is worth checking. Figures are the 2026 federal amounts.

The five statuses and who can use them

Your status is decided by your situation on the last day of the tax year, December 31. If you were married on that day, you count as married for the whole year.

1. Single. Unmarried, or legally separated under a divorce or separate maintenance decree, and not eligible for a better status.
2. Married filing jointly. Married couples combine all income and deductions on one return. Both spouses are responsible for the whole tax, including any errors. A couple can still file jointly for the year in which one spouse died.
3. Married filing separately. Each spouse files their own return and reports their own income. It is a legitimate choice, but usually the more expensive one, for reasons covered below.
4. Head of household. For an unmarried person (or one "considered unmarried") who paid more than half the cost of keeping up a home for a qualifying person, usually a child who lived with them for more than half the year. A dependent parent can qualify even without living in your home, if you paid more than half the cost of the parent's home.
5. Qualifying surviving spouse. For two years after the year a spouse died, a widow or widower who has a dependent child living at home can keep the joint brackets and standard deduction.

If more than one status fits, you may choose the one that results in less tax. IRS Publication 501, listed in this chapter's sources, has the full tests.

How status changes the numbers

Two things change most: the standard deduction and the width of each bracket. For 2026 the standard deduction is $16,100 for a single filer, $24,150 for head of household and $32,200 for a married couple filing jointly.

The brackets widen the same way. The 12% bracket, for example, ends at $50,400 of taxable income for a single filer, $67,450 for head of household and $100,800 for a couple filing jointly.

That is why head of household is so valuable to a single parent: a larger deduction and more income taxed at the low rates, on the same pay. People who qualify for it sometimes file as single simply because they do not know the status exists, and pay more tax than the law requires.

Marriage: a bonus, a penalty, or neither

Getting married changes your status, and whether that raises or lowers the couple's tax depends mostly on how their incomes compare. For most incomes the joint brackets are exactly twice as wide as the single ones, so two people with equal pay see little change.

Two single people each earning $60,000 pay $5,020 apiece. Married and filing jointly on a combined $120,000, they pay $10,040, exactly twice as much. Their marriage is tax-neutral.

The picture changes when one spouse earns most of the income.

On $100,000 a single filer pays $13,170 and reaches the 22.0% bracket. A married couple with the same total income, all earned by one spouse, pays $7,640 and stays in the 12.0% bracket. That difference is the marriage bonus: the earner's income is spread across the wider joint brackets.

A marriage penalty in the brackets appears only near the top, because the 37% bracket for couples does not start at twice the single level.

Two single people each earning $500,000 pay $138,134 each. Married, on $1,000,000 together, they pay $280,251, which is more than twice that, because part of their joint income now reaches the 37.0% rate.

Penalties also hide outside the brackets, at incomes well below that. The net investment income tax starts at $250,000 for a couple, not twice the $200,000 single threshold, and the Additional Medicare Tax works the same way. The cap on deducting state and local taxes is $40,400 per return whether you are single or a married couple, and the yearly limit on deducting capital losses against other income is also the same for a couple as for one person. Two high earners in a high-tax state can feel all of these at once.

When married filing separately makes sense

Filing separately usually costs a couple more. Separate filers lose or have reduced access to many tax breaks, including the education credits, the student loan interest deduction and, in most cases, the earned income credit and the credit for child and dependent care. The income range in which they can contribute to a Roth IRA is very small. And if one spouse itemizes deductions, the other must itemize too, even if that means giving up the standard deduction.

There are still situations where it is worth running the numbers both ways:

• Income-driven student loan repayment. Some plans base the payment on the borrower's own income when the couple files separately. A lower loan payment can outweigh a higher tax bill.
• Protecting yourself from a spouse's return. On a joint return each spouse is liable for the whole tax. If you doubt the accuracy of your spouse's income or deductions, separate returns keep the liability apart.
• Large medical expenses. Medical costs are deductible only above 7.5% of adjusted gross income. If one spouse has large bills and a lower income, that floor is lower on a separate return.

Couples in community property states, such as California and Texas, must generally split community income between their separate returns, which makes the comparison more involved.

Special situations

Separation and divorce. If your divorce is final by December 31, you are unmarried for that whole year. If you are still married but lived apart from your spouse for the last six months of the year and kept up a home for your child, you may be "considered unmarried" and able to file as head of household.

After a spouse dies. You can file jointly for the year of death, and as a qualifying surviving spouse for the next two years if you have a dependent child at home. After that, single or head of household applies.

A spouse who is not a US resident. A US citizen or resident married to a nonresident cannot normally file jointly, but the couple can elect to treat the nonresident spouse as a resident for tax purposes. That brings the joint brackets, but also puts the spouse's worldwide income on the US return. The nonresident spouse joint filing calculator compares the two.

Changing your mind. A couple who filed separately can generally switch to a joint return by amending within three years. A couple who filed jointly cannot switch to separate returns after the filing deadline has passed.