IRS Publication 501: Dependent Tests, Credits, and Penalties

The rules for claiming a dependent come down to sorting the person into one of two IRS categories — qualifying child or qualifying relative — and confirming they pass every test in that category plus three universal tests that apply to both. Get it right and you may unlock Head of Household filing status, the Child Tax Credit, the Earned Income Tax Credit, and more. Get it wrong and you can face a 20% accuracy penalty, plus a ban on claiming certain credits for two to ten years.

Three Tests That Apply to Everyone

Before the category rules matter, the person must clear three threshold requirements:

They generally cannot file a joint return with a spouse. The only exception is a joint return filed solely to claim a refund of withheld or estimated taxes, where neither spouse would owe anything on separate returns.¹
They must be a U.S. citizen, U.S. national, U.S. resident alien, or a resident of Canada or Mexico.¹
They cannot already be claimed by another taxpayer, and a dependent cannot claim their own dependent.²

Fail any one of these and the person is not your dependent, no matter how much you support them.

Qualifying Child

The qualifying child path leads to the most valuable credits, including the Child Tax Credit. Four tests apply.

Relationship. The person must be your son, daughter, stepchild, foster child, brother, sister, half-sibling, stepsibling, or a descendant of any of these — a grandchild, niece, or nephew, for example.³

Age. The child must be under 19 at the end of the tax year, or under 24 if a full-time student for at least five months of the year. A child who is permanently and totally disabled has no age limit.⁴ Except in the disability case, the child must also be younger than you (or your spouse if filing jointly).⁵

Residency. The child must have lived with you for more than half the year. Temporary absences for school, vacation, medical care, or military service count as time in your home.¹

Support. The child cannot have provided more than half of their own financial support for the year.³ You don’t need to show that you personally covered the majority. You only need to show the child didn’t.

Qualifying Relative

If the person doesn’t meet the qualifying child tests — an aging parent, an adult sibling, a domestic partner, a friend living in your home — they may still be a qualifying relative. Four tests apply here too.

Not a qualifying child. The person can’t be the qualifying child of you or anyone else.

Household or relationship. The person must either live with you all year as a member of your household, or be related to you in one of the ways the IRS lists (parents, grandparents, siblings, aunts, uncles, in-laws, certain step-relatives).¹ Listed relatives don’t have to live with you. An unrelated person qualifies only after a full 12 months in your home.²

Gross income. The person’s gross income for 2025 must be less than $5,200. The threshold is adjusted for inflation each year.¹ Gross income means taxable income: wages, interest, rental income, and the taxable portion of Social Security count. Tax-exempt income, such as certain disability payments, does not.

Support. You must have provided more than half of the person’s total support for the year.¹ When several people share the cost of supporting a parent and no one covers more than half, a Multiple Support Agreement can let one contributor take the claim, provided each contributor paid more than 10% and the others sign waivers. The person taking the claim files Form 2120.⁶

How to Calculate Support

The IRS defines support broadly. The Publication 501 worksheet counts lodging, food, utilities, repairs, clothing, education, unreimbursed medical and dental expenses, medical insurance premiums, childcare, and travel and recreation.¹

Two things trip people up. If you own your home and the dependent lives with you, lodging is the fair rental value of the space they occupy, not a share of your mortgage. And scholarships received by a full-time student are generally excluded from the qualifying child support test, so a student on a full ride isn’t treated as supporting themselves just because the scholarship covers tuition.

Divorced or Separated Parents

When parents don’t live together, the custodial parent — the one the child lived with for the longer part of the year — normally gets the dependency claim. The non-custodial parent can claim the child only if the custodial parent signs Form 8332, releasing the exemption, the Child Tax Credit, the Additional Child Tax Credit, and the Credit for Other Dependents.⁷

Form 8332 does not transfer Head of Household status or the Earned Income Tax Credit. Those stay with the custodial parent, always.

If both parents claim the same child without a signed Form 8332, IRS tie-breaker rules give the claim to the parent who housed the child longer. If time was split evenly, the parent with the higher adjusted gross income wins.⁸

Identification Numbers

Every dependent needs a taxpayer identification number on your return. Usually that’s a Social Security number. A non-citizen dependent who can’t get an SSN needs an Individual Taxpayer Identification Number (ITIN), applied for on Form W-7. Parents mid-adoption who can’t yet get an SSN for a child can use an Adoption Taxpayer Identification Number (ATIN), applied for on Form W-7A. An ATIN expires two years after issuance; once the adoption is final, you must get an SSN and notify the IRS.⁹

There’s a catch. A child with only an ATIN or ITIN does not qualify for the Child Tax Credit. The CTC requires a Social Security number valid for employment, issued before the due date of the return including extensions. Such a child may still qualify you for the smaller Credit for Other Dependents.⁹

What Claiming a Dependent Gets You

Head of Household

If you’re unmarried and pay more than half the cost of maintaining your home, a qualifying dependent can put you in Head of Household status. For tax year 2026, the Head of Household standard deduction is $24,150, compared with $16,100 for a single filer.¹⁰ The dependent generally must live with you for more than half the year. A parent you claim is an exception: they don’t need to live with you, as long as you pay more than half the cost of their separate home.¹

Child Tax Credit

The Child Tax Credit is worth up to $2,200 per qualifying child for 2025, and up to $1,700 per child is refundable through the Additional Child Tax Credit. The CTC has a tighter age limit than the general qualifying child rule: the child must be under 17 at year end. A 17- or 18-year-old can still be your dependent, but they won’t get you the CTC. The credit phases out starting at $200,000 of adjusted gross income for single and Head of Household filers, and $400,000 for joint filers.³

Credit for Other Dependents

Dependents who don’t qualify for the CTC — a 17- or 18-year-old, a college student, a parent, most qualifying relatives — can still generate the Credit for Other Dependents, a non-refundable credit worth up to $500.³

Earned Income Tax Credit

For lower-income households, this is where qualifying children move the needle most. The maximum EITC for 2025 is $649 with no qualifying children, $4,328 with one, $7,152 with two, and $8,046 with three or more.¹¹ The EITC is fully refundable.

Child and Dependent Care Credit

If you pay for care so you can work or look for work, a qualifying child under 13, or a dependent of any age who can’t care for themselves, may qualify you for this credit. Qualifying expenses top out at $3,000 for one dependent or $6,000 for two or more.¹²

Penalties for Getting It Wrong

An incorrect claim that leads to underpayment can carry a 20% accuracy-related penalty on the underpaid amount for negligence or disregard of the rules, on top of the additional tax and interest.¹³

Errors on EITC, CTC, or Credit for Other Dependents claims made with reckless or intentional disregard of the rules can bar you from claiming those credits for two years. Fraud pushes the ban to ten years.¹⁴

Documentation the IRS Will Ask For

If the IRS questions the claim, you’ll need proof. For residency, the IRS accepts school records, medical records, daycare records, or a letter on official letterhead from a school, medical provider, social service agency, or place of worship showing names, shared address, and dates. Letters from relatives are not accepted.¹⁵ For a non-related qualifying relative, records must cover all 12 months.

Keep support records too: housing costs, groceries, medical bills, insurance premiums. When the over-half-support test is the deciding factor, work through the Publication 501 worksheet. That’s the same worksheet an auditor will use.

1
Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
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Internal Revenue Service. Dependents
3
Internal Revenue Service. Child Tax Credit
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Internal Revenue Service. Dependents 2
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Internal Revenue Service. Qualifying Child Rules
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Internal Revenue Service. Form 2120 (Rev. December 2025), Multiple Support Declaration
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Internal Revenue Service. Form 8332 (Rev. December 2025), Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent
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Internal Revenue Service. Tie-Breaker Rule
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Internal Revenue Service. Dependents
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Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
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Internal Revenue Service. Earned Income and Earned Income Tax Credit (EITC) Tables
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Internal Revenue Service. Topic No. 602, Child and Dependent Care Credit
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Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments
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Internal Revenue Service. Consequences of Filing EITC Returns Incorrectly
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Internal Revenue Service. Supporting Documents for Dependents