Married Filing Jointly: Claiming Dependents, Credits, and Penalties

Under the married filing jointly rules for claiming dependents, each person you list on your return has to pass one of two IRS test sets: the Qualifying Child tests or the Qualifying Relative tests. Passing either one lets you claim the dependent. Which one they pass, plus the kind of taxpayer identification number they have, determines which credits you get, and joint filers get the highest income thresholds of any filing status before those credits phase out.

The Qualifying Child Tests

A Qualifying Child unlocks the most valuable credits, including the Child Tax Credit. The person has to pass all five tests:

Relationship. Your son, daughter, stepchild, foster child, sibling, step-sibling, or a descendant of any of those, such as a grandchild, niece, or nephew.
Age. Under 19 at the end of the tax year, or under 24 if a full-time student. No age limit if the child is permanently and totally disabled.
Residency. Lived with you more than half the year. Time away for school, medical treatment, or vacation still counts as time in your home.
Support. The child did not provide more than half of their own financial support for the year.
Joint return. The child generally cannot have filed a joint return with a spouse for the year.

Two exceptions matter here. An adult child of any age who is permanently and totally disabled still qualifies, which keeps you on the Child Tax Credit rather than dropping you down to the $500 Credit for Other Dependents.¹ And if your child and their spouse filed jointly only to claim a refund, and neither would owe tax filing separately, the joint-return test is not disqualifying.² That comes up most often with college-age children who marry but earn little income.

The Qualifying Relative Tests

When a person doesn’t meet the Qualifying Child rules — often because of age or because they aren’t closely enough related — they may still qualify as a Qualifying Relative. This category covers elderly parents, adult children over 24 who aren’t disabled, and other relatives you support. Four tests apply:

Not a Qualifying Child. The person cannot already qualify as anyone’s Qualifying Child for the year.
Gross income. The person’s gross income for the year must be less than $5,050. This threshold is adjusted annually for inflation.³
Support. You must have provided more than half of the person’s total support during the year. Note that this is the mirror image of the Qualifying Child support test: there, the child just cannot have supported themselves; here, you specifically must cover more than half.
Household or relationship. The person must have lived with you the entire year as a member of your household, or be related to you in a way the IRS recognizes. Parents, grandparents, siblings, aunts, uncles, and certain in-laws all count. Close relatives don’t need to live with you; unrelated household members do.

A Qualifying Relative gets you the $500 Credit for Other Dependents. Not the Child Tax Credit, not the Earned Income Tax Credit, and not the Child and Dependent Care Credit.

What a Joint Return Gets You Per Dependent

Child Tax Credit and Additional Child Tax Credit

For 2026, the Child Tax Credit is worth up to $2,200 per qualifying child under age 17 at the end of the tax year, reflecting the increase enacted under the One, Big, Beautiful Bill Act. Joint filers get the most generous phase-out threshold: the credit begins to reduce only when modified adjusted gross income exceeds $400,000. Every other filing status starts phasing out at $200,000. Most married couples earning under $400,000 will receive the full credit for every qualifying child.⁴

If your tax liability is low or zero, the refundable Additional Child Tax Credit can refund up to $1,700 per qualifying child.⁵ You need earned income of at least $2,500 to receive any ACTC, and the refundable amount is calculated as 15% of your earned income above that floor, capped at the $1,700 per child.⁴

Credit for Other Dependents

Dependents who don’t qualify for the Child Tax Credit — because they’re 17 or older, because they’re a Qualifying Relative rather than a Qualifying Child, or because they lack a Social Security number — may still qualify you for a flat $500 per dependent through the Credit for Other Dependents. It’s non-refundable, so it can reduce your tax bill to zero but won’t generate a refund.⁶ The phase-out thresholds match the CTC: $400,000 for joint filers, $200,000 for everyone else.

Earned Income Tax Credit

For lower- and moderate-income joint filers, the EITC can be worth more than the Child Tax Credit. The 2026 maximum for a married couple filing jointly with qualifying children is $8,231.⁷ The credit amount and income limit both climb with the number of qualifying children, and the credit is fully refundable. Joint filers get higher phase-out thresholds than single or head-of-household filers, so the credit stays available further up the income scale.

Child and Dependent Care Credit

If you pay for daycare, after-school programs, or other care for a dependent under 13 (or a dependent of any age who is physically or mentally unable to care for themselves) so that you and your spouse can work, you may claim the Child and Dependent Care Credit. Qualifying expenses are capped at $3,000 for one dependent or $6,000 for two or more. The percentage runs from 20% to 50% of those expenses depending on income, with lower earners getting the higher percentage. On a joint return, both spouses must have earned income during the year.

American Opportunity Tax Credit

When a dependent is in their first four years of college, the American Opportunity Tax Credit can provide up to $2,500 per student per year, with up to $1,000 of that refundable. Married couples filing jointly get the full credit if modified adjusted gross income stays below $160,000, and it phases out completely at $180,000.⁸ You claim the credit on your return, not the student’s, as long as you claim the student as a dependent.

SSN vs. ITIN: Which Credits You Actually Get

Every dependent you claim must have a taxpayer identification number issued by the due date of your return, including extensions.⁹ The type of number controls which credits you can claim:

A Social Security number valid for employment is required for the Child Tax Credit and the Additional Child Tax Credit. If the child doesn’t have one by the return’s due date, you cannot claim the CTC on either the original or an amended return.⁹
An ITIN or Adoption Taxpayer Identification Number is enough to claim the dependent and the $500 Credit for Other Dependents, but not the CTC or ACTC.⁴

If you’re adopting a U.S. citizen or resident child and can’t obtain a Social Security number yet, request an ATIN. You can claim the child as a dependent and receive the ODC while the adoption is pending.⁹

Claiming a Child From a Prior Relationship

When a joint return includes a child from one spouse’s prior relationship, the IRS default is straightforward: the custodial parent claims the child, and the custodial parent is whichever parent the child spent more nights with during the year.¹⁰

The custodial parent can release the claim to the noncustodial parent by signing IRS Form 8332. The noncustodial parent attaches a copy to their return for each year they claim the child. That release transfers the right to claim the Child Tax Credit and the Credit for Other Dependents.

What Form 8332 does not transfer is important. The Earned Income Tax Credit and the Child and Dependent Care Credit always stay with the custodial parent, because those credits depend on the child actually living with you.¹¹ Head of household status stays with the custodial parent too. So the custodial parent keeps several significant benefits even after signing.

When Two People Claim the Same Child

If more than one person tries to claim the same child, the IRS applies tiebreaker rules in a fixed order:¹²

If one claimant is the child’s parent and the other is not, the parent wins.
Between two parents who don’t file jointly, the parent the child lived with longer during the year wins.
If the child lived with each parent for exactly the same time, the parent with the higher adjusted gross income wins.
If no parent claims the child (even though a parent could), a non-parent can claim only if their AGI is higher than the highest AGI of any parent who could have claimed.
Between two non-parents, the one with the higher AGI wins.

The IRS won’t split credits between two filers who both claim the same child. One return gets the credit and the other gets a notice of adjustment, often months after filing.

Sharing the Cost of a Relative

Sometimes no single person provides more than half of a dependent’s support. This shows up most often when adult siblings share the cost of caring for an aging parent. The group can designate one member to claim the dependent through a multiple support agreement, filed on IRS Form 2120.¹³

To use Form 2120, you must have personally contributed more than 10% of the dependent’s support, and the group’s combined contributions must exceed 50%. Every other person who contributed more than 10% must sign a written statement waiving their claim for that year.¹³ Only one person can claim in any given year, but the group can rotate who claims from year to year.

Penalties for Claiming a Dependent You Shouldn’t Have

Claiming a dependent incorrectly doesn’t stop at paying back the credit. If the IRS finds you recklessly or intentionally disregarded the rules when claiming the CTC, ACTC, EITC, or American Opportunity Tax Credit, you face a two-year ban from claiming those credits. During the ban, you can’t claim the credit even for a legitimate qualifying child.¹⁴

If the claim was fraudulent, the ban runs ten years.¹⁵ On top of the ban, the IRS can assess a 20% accuracy-related penalty on the underpayment, or a 75% civil fraud penalty on the portion due to fraud.¹⁴

After a ban expires, you have to file Form 8862, Information to Claim Certain Credits After Disallowance, with your return before the credit is allowed again.¹⁶ Even a single disallowance for a math error triggers the Form 8862 requirement on future returns, and forgetting to attach it means the IRS will reject the credit automatically.

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Internal Revenue Service. Dependents 2
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Office of the Law Revision Counsel. 26 USC 152
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Internal Revenue Service. Dependents
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Internal Revenue Service. Parents: Check Eligibility for the Credit for Other 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. Education Credits – AOTC and LLC
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Internal Revenue Service. Dependents
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Internal Revenue Service. About Form 8332, Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent
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Internal Revenue Service. Earned Income Tax Credit
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Internal Revenue Service. Tie-Breaker Rule
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Internal Revenue Service. About Form 2120, Multiple Support Declaration
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Internal Revenue Service. 20.1.5 Return Related Penalties
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Internal Revenue Service. Understanding Your CP79B Notice
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Internal Revenue Service. Instructions for Form 8862