A household, for purposes of determining eligibility for premium tax credits, includes any individuals whom you list on the federal tax form. That includes yourself, your spouse, and dependents. Dependents include children who meet certain requirements:
- U.S. citizen or resident of the U.S, Mexico or Canada
- Live with you for more than half the year
- Under age 19 at the end of the year (or under age 24 if a full-time student); a child is considered to live with the taxpayer while he or she is temporarily away from home due to education, illness, business, vacation or military service.
- Doesn’t provide more than 50% of his or her own support
Other adults who can count as dependents include relatives, in-laws or full-time members of your household who:
- Are a U.S. citizen or resident of the U.S, Mexico or Canada
- Receive more than 50% of their support from you
- Are related to you or live in your home all year
- Make less than $4,150 (in 2018), generally excluding Social Security
A household can include individuals even if they are ineligible for tax credits (for example, individuals who are not lawfully present). Your household size can change during a year due to family changes, including the birth or adoption of a child, a child moving out of the house, and divorce or legal separation. When such changes take place you should report them to the Marketplace as they may affect your eligibility for subsidies. Family changes also can trigger a special enrollment opportunity when you can change health plans, even outside of the regular Open Enrollment period.
Note that the definition of household for determining eligibility for premium tax credits sometimes differs from the definition of household for determining Medicaid eligibility. Ask your Marketplace for more information about who should be counted in your household.