Do Dependents Have to File Taxes? Thresholds and the $400 Rule

Yes, dependents have to file taxes when their income crosses the IRS thresholds set for their situation, even though a parent or someone else claims them. Three separate triggers can create the obligation: earned income above the standard deduction, unearned income from investments above a much lower floor, or net self-employment earnings of $400 or more. For the 2026 tax year, a single dependent with only wages needs to file once earnings top $16,100, which matches the basic standard deduction for single filers.¹

Income Thresholds That Trigger a Return

The filing rules split by the type of income the dependent receives. Wages, salary, and tips are earned income. Interest, dividends, and capital gains are unearned income. The two categories have very different thresholds.

For a dependent with only earned income, no return is required unless wages exceed the basic standard deduction, which is $16,100 for 2026.¹ Unearned income triggers a return at a much lower level. For 2025, that threshold is $1,350; the 2026 figure will be slightly higher once the IRS publishes the updated Publication 501.²

When a dependent has both kinds of income, the IRS uses a combined test. A return is required if total gross income exceeds the larger of the unearned income minimum ($1,350 for 2025) or the dependent’s earned income plus $450, with that sum capped at the basic standard deduction.³ A teenager with $3,000 in wages and $800 in savings interest, for example, compares total gross income of $3,800 against the larger of $1,350 or $3,450 (wages plus $450). Because $3,800 tops $3,450, a return is required.

The reason a dependent’s standard deduction works this way is deliberate. Congress limits it to keep taxpayers from shifting investment income to a child or elderly relative who would otherwise owe little tax. A non-dependent single filer gets the full $16,100 regardless of income type; a dependent only reaches that full amount if their earned income alone justifies it.

The $400 Self-Employment Rule

A dependent who earns money through freelance work, gig platforms, or any self-employed activity faces a completely separate trigger. Once net self-employment earnings reach $400, the dependent must file a return and pay self-employment tax, regardless of whether they meet the regular income thresholds.⁴ This is the rule that surprises families most often. A high school student who earns $600 mowing lawns over the summer owes self-employment tax, even though $600 is well below the earned income filing threshold.

Self-employment tax covers Social Security and Medicare at a combined rate of 15.3%. The dependent reports net earnings on Schedule C and calculates the tax on Schedule SE, both attached to Form 1040.⁴ Half of the self-employment tax is deductible as an adjustment to income, which reduces the sting.

The Kiddie Tax on Investment Income

When a dependent child has substantial unearned income, a separate rule can push their tax bill much higher than their own bracket suggests. Under the kiddie tax, unearned income above $2,700 is taxed at the parent’s marginal rate if that rate is higher than the child’s.⁵ This applies to children under 18, 18-year-olds whose earned income doesn’t cover more than half their support, and full-time students ages 19 through 23 in the same situation.

The child reports the calculation on Form 8615, attached to their own return. Because the tax depends on the parent’s taxable income and filing status, the parent’s return generally has to be finished first. Parents sometimes have the option of skipping a separate return for the child by reporting the child’s interest, dividends, and capital gain distributions on their own return using Form 8814. For 2025, the child’s gross income must be under $13,500 to qualify, and the child must be under 19 (or under 24 if a full-time student).⁶ The trade-off: using Form 8814 raises the parent’s adjusted gross income, which can shrink other tax benefits.

When Filing Voluntarily Makes Sense

Even when a dependent’s income falls below every threshold, filing is sometimes the only way to get money back. The typical scenario is a part-time job where the employer withheld federal income tax, shown in Box 2 of Form W-2. If total income sits below the filing threshold, the tax liability is zero and every dollar withheld comes back as a refund. Skipping the return forfeits that money.

Some credits stay out of reach for dependents, so a voluntary return won’t unlock them. A dependent claimed on someone else’s return cannot claim the Earned Income Tax Credit.⁷ Education credits like the American Opportunity Tax Credit and the Lifetime Learning Credit belong to the parent who claims the dependent, not the dependent.⁸ A dependent’s voluntary return is a tool for recovering withholding, not for accessing family credits.

How To File the Return

Dependents use the same Form 1040 as everyone else. On that form, the dependent must check the box indicating that someone else can claim them. That box controls the standard deduction calculation, limiting it to the dependent formula rather than the full amount. Personal exemptions remain at $0 for 2026, so the checkbox no longer affects exemptions, but it still determines how much income is shielded from tax.¹ Forgetting to check it is one of the most common dependent filing errors and can delay processing.

Documents to gather include Form W-2 for wages and any 1099 forms for investment or contractor income (1099-INT for interest, 1099-DIV for dividends, 1099-NEC or 1099-MISC for freelance work). These arrive by January 31 following the tax year.⁹ IRS Free File offers guided tax software at no cost for filers with adjusted gross income of $89,000 or less, and Free File Fillable Forms are available at any income level.¹⁰

A minor child who cannot sign their own return needs a parent or guardian to sign for them. The signature reads: the child’s name followed by “By [parent’s name], parent for minor child.”² Electronically filed returns typically process within 21 days; paper returns take six weeks or more.¹¹

Penalties for Skipping a Required Return

A dependent who was required to file but didn’t faces the same failure-to-file penalty as any other taxpayer: 5% of the unpaid tax for each month the return is late, up to 25%.¹² If no tax is owed, no penalty applies, which is why dependents below the filing threshold who skip a voluntary return face no consequences beyond the lost refund.

The clock starts the day after the filing deadline. Self-employment income raises the stakes, because both income tax and self-employment tax can be owed. Parents and guardians are on the hook for making sure a minor’s return is filed on time, and the IRS holds the parent accountable for any resulting penalties.

State Returns Follow Different Rules

Federal filing thresholds do not settle state income tax. Most states with an income tax set their own filing requirements for dependents, and the thresholds vary widely. Some states require a return with any taxable income at all; others set minimums that range from a few hundred dollars to several thousand. A handful of states have no income tax at all. Checking your state’s department of revenue website for the current year’s rules is worth the few minutes, because state penalties for non-filing follow the same pattern as the federal ones.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
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Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
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Internal Revenue Service. Topic No. 551, Standard Deduction
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Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
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Internal Revenue Service. Topic No. 553, Tax on a Child’s Investment and Other Unearned Income
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Internal Revenue Service. Instructions for Form 8615
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Internal Revenue Service. Who Qualifies for the Earned Income Tax Credit (EITC)
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Internal Revenue Service. Education Credits: American Opportunity Tax Credit (AOTC) and Lifetime Learning Credit (LLC)
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Internal Revenue Service. About Form W-2, Wage and Tax Statement
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Internal Revenue Service. E-File: Do Your Taxes for Free
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Internal Revenue Service. Refunds
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Internal Revenue Service. Failure to File Penalty