When Do You Start Owing Taxes: Filing Thresholds and the $400 Rule

You start owing federal income tax when your gross income for the year rises above the standard deduction for your filing status. For 2026, that means $16,100 for a single filer under 65, $24,150 for head of household, and $32,200 for a married couple filing jointly.¹ Below those numbers, your taxable income is zero and you generally owe nothing. Different, lower triggers apply if you are self-employed, claimed as a dependent, or receiving Social Security.

2026 Income Thresholds by Filing Status

The IRS pegs its filing thresholds to the standard deduction, because income under the deduction produces zero taxable income. For taxpayers under 65 in tax year 2026:

Single: $16,100
Head of Household: $24,150
Married Filing Jointly: $32,200
Qualifying Surviving Spouse: $32,200
Married Filing Separately: $5

Taxpayers 65 or older get a slightly higher standard deduction, which raises their threshold by the same amount.²

The $5 married-filing-separately threshold is not a typo. When one spouse itemizes deductions, the other spouse loses the standard deduction entirely, so nearly any income becomes reportable.² If both spouses filing separately take the standard deduction, the threshold rises to $16,100.¹

What Income Counts Toward the Threshold

Gross income includes wages, salaries, tips, business revenue, investment returns, rental income, and most other economic gains during the year. Cash, property, or services you receive generally count unless a specific provision in the tax code excludes them.³

Some money you receive does not count. Life insurance proceeds paid after someone’s death, gifts and inheritances, most personal injury settlements, qualifying scholarships, and up to $250,000 of profit from selling your primary home ($500,000 for married couples) are excluded from gross income. Municipal bond interest is also excluded. None of these push you toward the filing thresholds above.

Self-Employment: You Owe Tax at $400

Freelancers, independent contractors, gig workers, and small business owners hit a much lower trigger. If your net earnings from self-employment reach $400 for the year, you owe self-employment tax, even if your total income falls well below the standard deduction.⁴

The self-employment tax rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.⁵ The Social Security portion applies only to net earnings up to $184,500 in 2026; earnings above that cap escape the 12.4% piece.⁶ The 2.9% Medicare piece has no cap. This tax covers the Social Security and Medicare contributions an employer would normally split with you, which is why the trigger is so much lower than the income tax threshold.

A concrete example: a single person earning $8,000 from freelance work owes no income tax (well under the $16,100 threshold) but still owes roughly $1,130 in self-employment tax, calculated on Schedule SE of Form 1040.

High earners face an added 0.9% Medicare tax on self-employment income above $200,000 for single filers, $250,000 for married filing jointly, or $125,000 for married filing separately.⁷ One narrow exception at the low end: employees of churches or church-controlled organizations that opted out of Social Security and Medicare owe self-employment tax once they receive more than $108.28 from the church.⁸

Social Security Recipients: A Separate Trigger

If you collect Social Security, part of your benefits can become taxable long before your other income hits the standard deduction. The IRS uses a formula it calls combined income: your adjusted gross income, plus any tax-exempt interest, plus half of your Social Security benefits.⁹

Below $25,000 (single) or $32,000 (married filing jointly): no benefits are taxed.
$25,000 to $34,000 (single) or $32,000 to $44,000 (joint): up to 50% of benefits may be taxed.
Above $34,000 (single) or $44,000 (joint): up to 85% of benefits may be taxed.

These thresholds are written into the statute and are not adjusted for inflation, so more retirees cross them each year as other income sources grow.⁹ Married couples filing separately who lived together at any point during the year have a base amount of $0, meaning their benefits are taxable from the first dollar of combined income.

If Someone Claims You as a Dependent

Dependents face lower thresholds than independent taxpayers, and the IRS splits the test between earned income (wages, tips, salary) and unearned income (interest, dividends, capital gains).

For 2025 (the most recently published figures; 2026 amounts typically rise slightly with inflation), a dependent under 65 who is not blind had to file if any of these applied:¹⁰

Unearned income more than $1,350
Earned income more than $15,750
Gross income more than the larger of $1,350, or earned income (up to $15,300) plus $450

The earned income threshold tracks the standard deduction, so it will rise to $16,100 for 2026.¹ Check IRS Publication 501 for the final 2026 unearned-income figures once released.

The Kiddie Tax on Investment Income

If a child’s unearned income exceeds $2,700, the portion above that amount is taxed at the parent’s marginal rate rather than the child’s.¹¹ The rule applies to children under 19, or under 24 if a full-time student, who have at least one living parent. It stops families from shifting investment assets to children to capture lower brackets.

Married Dependents

A married dependent whose spouse files separately and itemizes deductions faces a filing threshold of just $5, the same rule that catches non-dependent separate filers.²

File Anyway When You Are Below the Threshold

Being under the threshold means you are not required to file. It does not mean filing is pointless. The IRS cannot send you money you are owed unless you file a return. Situations where filing puts money back in your pocket:

Federal income tax was withheld from your paychecks. A return is the only way to recover that withholding.²
You qualify for the Earned Income Tax Credit, a refundable credit for low- and moderate-income workers that only pays out if you file.
You made estimated tax payments that exceeded your final bill.
You qualify for other refundable credits, such as the Additional Child Tax Credit or the American Opportunity Tax Credit for education expenses.

Filing is mandatory regardless of income if you received advance payments of the Premium Tax Credit for health insurance bought through the Marketplace. You must reconcile those advance payments on Form 8962.¹²

State Taxes Are Separate

The thresholds on this page cover only your federal obligation to the IRS. Most states impose their own income tax with separate filing requirements, and state thresholds vary widely, from a few thousand dollars in some states to no income tax at all in others. A handful of states tax only investment income. Clearing or missing the federal threshold does not settle the state question, so check your state revenue department for its specific rules.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
2
Internal Revenue Service. Check if You Need to File a Tax Return
3
Office of the Law Revision Counsel. 26 USC 6012 – Persons Required to Make Returns of Income
4
Office of the Law Revision Counsel. 26 USC 1402 – Definitions
5
Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax
6
Social Security Administration. Contribution and Benefit Base
7
Internal Revenue Service. Topic No. 560, Additional Medicare Tax
8
Internal Revenue Service. Topic No. 554, Self-Employment Tax
9
Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits
10
Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
11
Internal Revenue Service. Topic No. 553, Tax on a Child’s Investment and Other Unearned Income
12
Internal Revenue Service. Premium Tax Credit: Claiming the Credit and Reconciling Advance Credit Payments