Hal_Al
Level 15

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There are two types of dependents, "Qualifying Children"(QC) and standard ("Qualifying Relative" in IRS parlance even though they don't have to actually be related). There is no income limit for a QC but there is an age limit, a relationship test and a residence test. Only a QC qualifies the taxpayer for the Earned Income Credit.

A child of a taxpayer can still be a “Qualifying Child” (QC) dependent, regardless of his/her income, if he is under age 19, or under 24 if a full time student for at least 5 months of the year, or is totally & permanently disabled.

After age 23, the income test kicks in. 

The 6 tests for claiming a qualifying relative dependent:

1. Closely Related OR live with the taxpayer ALL year

2. His/her gross taxable income for the year must be less than $4,050 (2016)

3. The taxpayer must have provided more than 1/2 his support

In either case:

4. He must be a US citizen or resident of the US, Canada or Mexico

5. He must not file a joint return with his spouse or be claiming a dependent of his own

6. He must not be the qualifying child of another taxpayer