Individual Taxation: Filing Status, Exemptions, Credits, and Estimated Payments
Filing status
The five statuses are single, married filing jointly, married filing separately, head of household, and qualifying surviving spouse. Head of household requires an unmarried or considered-unmarried taxpayer who maintains a household for more than half the year for a qualifying person and pays more than half the household costs. A qualifying surviving spouse is a taxpayer whose spouse died in one of the two prior years, who maintains a home for a dependent child, and who could have filed jointly. Married filing separately generally requires both spouses to itemize or both to take the standard deduction and limits several credits.
Exemptions and dependency
The personal and dependency exemption deduction is suspended for 2018 through 2025, but dependency tests still control credits. A qualifying child must meet relationship, age, residency, support, and joint-return tests. A qualifying relative must be supported more than half by the taxpayer, have gross income below the exemption amount, not be a qualifying child, and meet the relationship or member-of-household test.
Credits and estimated payments
Common individual credits include the child tax credit ($2,000 per qualifying child, with a refundable portion), the $500 credit for other dependents, the child and dependent care credit, the earned income credit, the American Opportunity and lifetime learning credits, and the saver’s credit. Estimated tax is required if withholding and credits are less than the smaller of 90% of current-year tax or 100% of prior-year tax (110% if prior-year AGI exceeds $150,000, or $75,000 married filing separately). Withholding is treated as paid evenly through the year.
Worked example
A taxpayer has 2024 tax of $24,000, 2023 tax of $20,000, 2023 AGI of $160,000, and $20,000 of withholding plus $1,000 of timely estimates. The safe harbor is 110% of $20,000, or $22,000, because AGI exceeds $150,000. The required annual payment is the lesser of 90% of $24,000 ($21,600) or $22,000, or $21,600. Total payments are $21,000, leaving a $600 shortfall subject to the §6654 penalty.
Traps
- Claiming head of household without the support and residency tests.
- Assuming the exemption deduction still reduces taxable income.
- Ignoring the child tax credit phaseout and refundable limit.
- Using 100% rather than 110% of prior-year tax when AGI is high.
- Treating estimates as paid on the due date rather than quarterly.