Pub 17 Study Notes, Chapter 3: Dependents (Tax Years 2023 to 2026)

Chapter 3 of IRS Publication 17 decides who you may list as a dependent on Form 1040. A dependent is a qualifying child or a qualifying relative, and either must also pass three gatekeeper tests. In the 2025 edition it covers printed pages 26 to 37; the 2023 and 2024 editions have the same chapter. It touches the Dependents rows of Form 1040 or 1040-SR, Forms 8332 and 2120, and Forms SS-5, W-7 and W-7A. The results feed head of household in chapter 2 and the credits in chapter 14; see also our child tax credit and dependents guide. These are unofficial study notes in our own words; the IRS publication controls.

Key terms

The three gatekeeper tests

1. Dependent taxpayer. If another taxpayer can claim you (or your spouse on a joint return), you can claim no one, unless that taxpayer files only to recover withheld or estimated tax.
2. Joint return. You generally cannot claim a married person who files jointly, unless the return is only a refund claim for withheld or estimated tax. Claiming any credit, such as the American opportunity credit, breaks the exception.
3. Citizen or resident. The person must be a U.S. citizen, resident alien or national, or live in Canada or Mexico. An adopted noncitizen child passes if a U.S. citizen or national adoptive parent had the child in the home all year (or for the rest of the year after placement for adoption). Foreign exchange students placed for a temporary stay generally fail.

Qualifying child: five tests

Student means full-time during part of each of any five calendar months (not necessarily consecutive) at a regular school or in on-farm training; online-only and correspondence schools do not count. Permanently and totally disabled means a physical or mental condition prevents any substantial gainful activity, and a doctor determines it has lasted, or is expected to last, a year or more, or could end in death. A child born or deceased in the year counts if your home was the child's home for over half the time alive; a live birth needs official proof, and a stillborn child cannot be claimed.

Children of divorced or separated parents

The custodial parent has the child for more nights; with equal nights, the higher-AGI parent is custodial. December 31 belongs to the year it begins in, an emancipated child lives with neither parent, and a camp absence counts for the parent the child would have been with.

The noncustodial parent is treated as having the qualifying child only if all four are true:

1. The parents are divorced or legally separated, separated under a written agreement, or lived apart for all of the last six months of the year (married or not).
2. The child received over half of their support from the parents.
3. The child was in one or both parents' custody for over half the year.
4. The custodial parent signs a release (Form 8332 or a similar statement) that the noncustodial parent attaches; or a pre-1985 decree or agreement lets the noncustodial parent claim, was not changed after 1984, and the noncustodial parent gives at least $600 of support.

What moves. The noncustodial parent gets the dependency claim, the child tax credit, the additional child tax credit and the credit for other dependents. Head of household, the care credit, the care benefits exclusion and EIC stay with the custodial parent (EIC may go to another eligible person).

Form 8332. Part I releases the current year, Part II future years, Part III revokes. For decrees from 2009 on, the release must be unconditional (not tied to support payments) and on the form or a single-purpose statement; for 1985 to 2008 decrees, certain decree pages can substitute. Attach it every year, even if filed before; e-filers send it with Form 8453. A revocation works no earlier than the year after notice.

Qualifying child of more than one person

When a child fits two people, only one may take these five benefits: the child tax credit and related credits, head of household, the care credit, the care benefits exclusion and EIC. They cannot be split. "Parent" means a biological or adoptive parent; a stepparent or foster parent counts only after adopting (stated in the 2024 and 2025 editions, not the 2023 edition).

A loser can still claim EIC as a taxpayer without a qualifying child.

Qualifying relative: four tests

1. Not a qualifying child of you or anyone else. There is no age test. A child qualifies if the parent need not file (or files only for a refund), or if the child lives in Canada or Mexico with caregivers who are not U.S. taxpayers.
2. Household member or relative. Either lived with you all year as a member of the household, or is your child, stepchild, foster child or their descendant; a sibling, half or step sibling; a parent, grandparent or other direct ancestor (not a foster parent); a stepparent; a niece or nephew; an aunt or uncle; or an in-law. In-law ties survive death and divorce. A cousin must live with you. Anyone who was your spouse during the year is out, and a relationship that breaks local law disqualifies a household member.
3. Gross income below the yearly limit. Taxable unemployment and taxable Social Security count; nontaxable Social Security does not.
4. Support. You provide over half of total support from all sources.

Counting support. Include lodging at fair rental value, medical insurance premiums (not benefits), child care payments, and the person's own money, even tax-exempt Social Security, but only when spent. State benefits count as the state's support; TANF-type payments you pass on count as yours (printed from the 2024 edition). Leave out income and payroll taxes, life insurance, funeral costs and scholarships. Support counts in the year paid.

Multiple support agreement

When no one pays over half but a group does, one member who paid over 10% may claim. Every other eligible member signs a waiver; the claimant keeps the waivers and attaches Form 2120. It applies to qualifying relatives, not qualifying children, and a dependent claimed this way cannot qualify you for head of household. If more than half comes from people who cannot claim, no one can.

Taxpayer ID numbers

List an SSN for every dependent, at any age. Without one, file Form SS-5 (about two weeks) and consider a Form 4868 extension. A dependent who cannot get an SSN uses an ITIN (Form W-7); a child in a pending adoption with neither uses an ATIN (Form W-7A). A missing or wrong number can cost you benefits.

By tax year: 2023, 2024, 2025 and 2026

2026 column: planning figures from Rev. Proc. 2025-32 and the 2025 law; Pub 17 (2026) is not yet published (expected about mid-January to February 2027). The $500 credit for other dependents is written into section 24(h)(4) of the Internal Revenue Code and is not indexed for inflation. The 2025 law left that amount alone, and Form W-4 (2026) Step 3 uses $500 per other dependent, so $500 carries into 2026 as a planning figure.

Rule changes by year:

• All years: the tests, tie-breakers and Form 8332 and 2120 rules read the same in all three editions except as listed.
• 2024 edition: adds the definition of "parent" for tie-breakers and the TANF paragraph.
• 2025: limit $5,200; child tax credit $2,200, and the 2025 law requires the taxpayer's SSN (one spouse on a joint return) as well as the child's, valid for work and issued before the due date (the IRS counts extensions, per chapter 14 of the 2025 edition); the credit for other dependents needs the taxpayer's SSN or ITIN by the due date (extensions included); Form 1040 gets numbered Dependents rows.
• 2026 planning: the limit is $5,300 and the same SSN rules continue.

Worked examples

Example 1 (2025, tie-breaker). Priya, 25, and her son lived all year with her mother, Lata. Priya's AGI is $12,000 and Lata's is $30,000. If Priya lets Lata claim the son, Lata may, because $30,000 beats $12,000. If both claim him, Priya wins as the parent.

Example 2 (2024, divorced parents). Zoe, 8, spent 200 of 366 nights with Elena and 166 with Marcus, so Elena is custodial. Elena signs Form 8332 Part I for 2024 and Marcus attaches it, so he may claim Zoe and the $2,000 child tax credit, provided the other tests are met. Elena keeps any head of household and EIC claim she qualifies for.

Example 3 (2023, multiple support). A mother with $3,000 of taxable pension income (under the $4,700 limit) has $20,000 of total support: $4,000 her own, $7,000 from Ana, $6,000 from Ben and $3,000 from Cy. The children give $16,000, or 80%. Ana is at 35%, Ben 30% and Cy 15%, each over 10%, so any one may claim and the others sign waivers.

Common mistakes and exam traps

• Applying the gross income test to a qualifying child; it applies only to a qualifying relative.
• Letting a noncustodial parent claim on a post-2008 decree alone, without Form 8332.
• Assuming Form 8332 also moves head of household or EIC, or splitting the five benefits between claimants.
• Counting nontaxable Social Security as gross income, or forgetting it counts as support when spent.
• Overlooking the citizen or resident test for a relative living abroad.

Forms and lines map

The 2026 draft Form 1040 keeps the same Dependents columns and adds a citizenship or work-authorization question for you and your spouse.

Check yourself

(2025) A child turned 19 on December 10, 2025, and is not a student or disabled. Qualifying child?

Answer: No. The child must be under 19 at year end.

(2024) Your mother's gross income is $5,100 and you pay all her support. Can you claim her?

Answer: No. Gross income must be less than $5,050 for 2024.

(2023) Your uncle lives elsewhere, has $4,600 gross income and you give 70% of his support. Qualifying relative?

Answer: Yes, if the gatekeeper tests pass. An uncle is a listed relative, income is under $4,700 and support is over half.

(2024) A child lived exactly 183 nights with each parent. Parent A has AGI $40,000 and parent B $55,000. Who is custodial?

Answer: Parent B, the higher AGI.

(2025) A father relies on a 2015 decree that lets him claim his son, with no Form 8332. Can he?

Answer: No. Decrees from 2009 on require Form 8332 or an equivalent statement.

(2025) Which benefits does Form 8332 move to the noncustodial parent?

Answer: The dependency claim, child tax credit, additional child tax credit and credit for other dependents. Not head of household, EIC or the care credit.

(2025) A parent's support is 35% you, 25% your sister, 8% your brother and 32% the parent's own funds. Who may claim?

Answer: You or your sister. The three of you together pay 68%, but your brother is not over 10%. One claims on Form 2120.

(2025) Your 30-year-old child lives with you all year and has $3,000 of gross income. Which test could apply?

Answer: Qualifying relative, since the age test rules out qualifying child. Income is under $5,200; you must also give over half the support.

Frequently asked questions

General information only, not tax, legal or accounting advice for your situation. Rules, limits and deadlines change; confirm the current rules with the official source or a qualified professional before you act. Reading this page does not create a professional relationship with CPA Tax Payroll and Accounting Corp.