IRC §2(a) provides that a surviving spouse may use the qualifying surviving spouse filing status for two years following the year of the spouse's death if they maintain a household for a dependent child and do not remarry. In this case, Jordan's spouse died in 2025, Jordan did not remarry, and Jordan maintained a home for a dependent child (biological son, age 9) who lived with Jordan all year. The correct answer is qualifying surviving spouse because Jordan meets all requirements: the spouse died during the tax year, Jordan has not remarried, and Jordan maintains a household as the principal place of abode for a dependent child. Single (A) is incorrect because Jordan can use a more beneficial status; married filing separately (B) is incorrect because Jordan can file a joint return for the year of death or use qualifying surviving spouse status; head of household (D) is incorrect because qualifying surviving spouse provides the same benefits as married filing jointly and takes precedence when available. The key principle is that qualifying surviving spouse status provides the same tax rates and standard deduction as married filing jointly for up to two years after a spouse's death when a dependent child is present.

IRC §152(c) establishes that a child under age 19 at year-end who lives with the parent for more than half the year qualifies as a qualifying child if they did not provide more than half of their own support. Leah's son (age 18) lived with her all year, and while he earned $9,500 and used it for personal expenses, Leah paid all housing, food, and medical costs, meaning the son did not provide more than half of his total support. The correct answer recognizes the son as a qualifying child because he meets all tests: relationship (son), age (under 19), residency (lived with Leah all year), and support (did not provide more than half of own support). Answer B is incorrect because qualifying children have no gross income limit; C is incorrect because age 18 qualifies for qualifying child status; D is incorrect because the test is whether the child provides more than half of their own support, not whether the parent provides all support. The key principle is that a child's earned income does not disqualify them as a qualifying child if they don't provide more than half of their own support.

This question tests the multiple support agreement rules under IRC §152(d)(3), which allow taxpayers to claim a qualifying relative when no single person provides more than 50% of support. Grant provided $9,000 of the mother's $16,000 total support (56.25%), while his siblings provided $4,000 (25%) and $3,000 (18.75%) respectively. Under the multiple support agreement, Grant qualifies to claim his mother because he provided more than 10% of support, the group collectively provided more than 50%, and the other contributors who provided more than 10% signed Form 2120 waiving their right to claim. Option B is incorrect because the multiple support agreement specifically addresses situations where no one person provides majority support. Option C is incorrect because the residency requirement applies to qualifying children, not qualifying relatives claimed under multiple support agreements. Option D is incorrect because while interest income is included in the gross income test, the mother's $2,500 is well below the 2025 exemption amount threshold. When multiple family members support a relative, executing a proper multiple support agreement allows the designated contributor to claim the dependency exemption, provided all other dependency tests are met.

IRC §152(e) establishes special rules for children of divorced parents, designating the parent with whom the child lived for the greater number of nights as the custodial parent who claims the dependency exemption unless a valid Form 8332 release is executed. The child lived with Zoe for 205 nights and Ethan for 160 nights, making Zoe the custodial parent regardless of income levels or child support payments. The correct answer states the proper rule that custodial parent status is determined by counting nights and that parent generally claims the child absent a written release. Answer B is incorrect because child support payments don't determine custodial parent status; C is incorrect because income levels are irrelevant to custody determination; D is incorrect because a divorce decree alone cannot transfer dependency rights without Form 8332. The fundamental principle for divorced parents is that dependency follows physical custody as measured by nights, not financial support or income levels.

IRC §2(b) provides that a taxpayer legally separated under a decree of separate maintenance is considered unmarried for head of household purposes if they maintain a household for a qualifying person. Nina became legally separated under a decree in November 2025, lived apart from her spouse for the last two months, maintained a home for her child (age 5) all year, and paid more than half the household costs. The correct answer is head of household because Nina meets all requirements: considered unmarried due to legal separation decree, maintained a household as the principal place of abode for a qualifying child, and paid more than half the costs. Married filing jointly (A) and married filing separately (B) are incorrect because legal separation under a decree makes Nina considered unmarried; single (D) is incorrect because Nina qualifies for the more beneficial head of household status. The key principle is that legal separation under a court decree allows a taxpayer to be considered unmarried for head of household purposes, unlike informal separation.

IRC §152(e) establishes that for divorced parents, the custodial parent is determined by counting nights the child lived with each parent, and that parent claims the child unless they sign Form 8332 releasing the claim. Child A lived with Noah 183 nights versus 182 with the ex-spouse, making Noah the custodial parent for Child A by one night; Child B lived with the ex-spouse 250 nights versus 115 with Noah, making the ex-spouse the custodial parent for Child B. The correct answer recognizes that Noah can only claim Child A based on the nights test. Answer A is incorrect because income doesn't determine custody; C is incorrect because age doesn't affect custody determination; D is incorrect because split custody allows each parent to claim the children for whom they are custodial parent. The key principle is that custody for tax purposes is determined child by child based on nights, and even one additional night determines the custodial parent.

IRC §152(c) and the tiebreaker rules for divorced parents establish that the custodial parent is determined by the number of nights the child resides with each parent during the year. The child lived with Avery for 190 nights and Blair for 175 nights, making Avery the custodial parent who has the right to claim the child absent a valid Form 8332 release. The correct answer is Avery because the custodial parent determination is based solely on nights of residence, not income levels or child support payments. Blair (A) is incorrect because higher income and paying child support do not override the nights test; either parent (C) is incorrect because the tiebreaker rules specifically designate one parent; neither parent (D) is incorrect because the child need not live with one parent the entire year. The fundamental principle for divorced parents is that custody for dependency purposes is determined by counting nights, and only the custodial parent can claim the child unless they execute a written release on Form 8332.

IRC §152 defines two categories of dependents: qualifying children and qualifying relatives, with different tests applying to each category. Casey's nephew (age 17) who lived with Casey all year meets the qualifying child tests: relationship (nephew qualifies), age (under 19), residency (lived with Casey all year), and support (did not provide more than half of own support). Casey's mother meets the qualifying relative tests: relationship (parent qualifies), gross income test (Social Security benefits and tax-exempt interest totaling $4,100 are below the exemption amount), and support test (Casey provided 60% of support). The correct answer recognizes both can be claimed because each meets their respective dependency tests. Answer A is incorrect because parents need not live with the taxpayer; B is incorrect because nephews can be qualifying children; D is incorrect because neither tax-exempt interest nor Social Security benefits automatically disqualify dependency if under the gross income limit. The key principle is that different dependency rules apply to qualifying children versus qualifying relatives, and a taxpayer may claim multiple dependents if each meets the applicable tests.

IRC §152(d) requires qualifying relatives to have gross income below the exemption amount (approximately $5,050 for 2025), and adult children over age 23 who are not full-time students can only qualify as qualifying relatives, not qualifying children. Mia's son (age 27) had $7,000 in gross income ($6,800 wages plus $200 interest), which exceeds the gross income limit for qualifying relatives, disqualifying him as a dependent despite Mia providing 80% of his support. The correct answer recognizes that the son cannot be a dependent due to exceeding the gross income limit and being too old for qualifying child status. Answer A is incorrect because the son exceeds the gross income limit; B is incorrect because he's too old and not a student for qualifying child status; D is incorrect because filing status doesn't determine dependency eligibility. The principle is that adult children must meet the qualifying relative gross income test to be dependents.

IRC §2(b) requires a qualifying person for head of household status, which generally means a dependent for whom the taxpayer can claim an exemption or who would qualify except for certain exceptions. Since Paige's fiancé claims their child as a dependent, and the child is not related to Paige, Paige has no qualifying person for head of household purposes despite paying more than half the household costs. The correct answer is single because Paige lacks a qualifying person for head of household status. Answer A is incorrect because paying household costs alone doesn't qualify someone for head of household without a qualifying person; C is incorrect because qualifying surviving spouse requires a deceased spouse; D is incorrect because Paige is not married. The key principle is that head of household requires both maintaining a household and having a qualifying person, typically a dependent the taxpayer can claim.