Updated August 2, 2026. Quick answer: claiming a parent as a dependent turns on two separate tests. Their gross income must be under $5,300 for 2026, and you must provide more than half their support. Most families fail the first one and stop reading — which is the expensive mistake, because the deduction for their medical costs uses the support test without the income test. You can lose the dependency claim and keep that.
Your parent does not have to live with you. That rule catches people out in both directions.
Where you stand
The two tests, from the statute
Income. Their gross income must be “less than the exemption amount”, which Revenue Procedure 2025-32 sets at $5,300 for 2026. Note less than — income exactly at the figure fails. Social Security is often wholly or partly excluded from gross income, which is why parents living on Social Security alone frequently pass a test their families assume they fail.
Support. You must provide “over one-half of the individual’s support”. Support is the whole cost of keeping them — housing at fair rental value, food, medical, transport, care. Money your parent spends on themselves out of their own income counts as support they provided, which is the part most people forget.
When no one pays half: the form nobody knows about
Three siblings each covering a third is the commonest family arrangement and, read literally, it means nobody can claim the parent. The Code anticipated this. Where you together pay more than half, one of you may claim — provided that person paid over 10%, and each other person who paid over 10% signs a statement giving up the claim. That is Form 2120, and the claim can rotate between siblings year to year.
What claiming actually gets you
A dependent parent is not a qualifying child, so the credit is the $500 credit for other dependents — nonrefundable, and not indexed, so it quietly shrinks in real terms each year. Modest. The larger prize is usually filing status: a dependent parent can make you head of household even though they live somewhere else, which is worth considerably more than $500 to most people who qualify.
And if you fail the income test
Read this part even if the calculator said no. The medical expense deduction applies the dependency definition with the income test switched off. Pass the support test and their medical costs are yours to deduct, whatever their income was. What that is worth at real care prices is the page that matters most here, because memory care runs to numbers that clear the 7.5% floor easily.
The practical order of things
Most families arrive at this page somewhere in the middle of a harder problem. If you are earlier than that: how the money for care actually gets found. If you are paying a family member to provide the care, do it under a written agreement — informal payments can be treated as gifts and cost a Medicaid application later. And if you are taking over their affairs, expect the bank to be the hard part.
Dependency tests from 26 U.S.C. § 152(d); the 2026 gross-income limit of $5,300 from IRS Revenue Procedure 2025-32 § 4.23 (Publication 501 for 2026 is not yet published, so the Revenue Procedure is the source); multiple-support rules from § 152(d)(3) and the Form 2120 instructions; the credit from § 24(h)(4). Read August 2026. General information, not tax advice. Dependency and support determinations turn on facts no article can see, and the amounts are indexed annually.
If the income test is what failed. The gross-income limit that blocks dependency does not block the child and dependent care credit — the IRS says so in terms — but a different rule does: the dependent care credit for elder care.