how much can a dependent make to still be claimed

    It depends.  The criteria for the two types of dependents are:
    Requirements for a qualifying child,
    ----- they must not file a joint return with another,
    ----- the child must be your son, daughter, parent, sibling, grandchildren, etc.***,
    ----- the child must be under the age of 19 (or 24 if a full time student for any portion of any 5 months during the year),
    ----- the child must not provide more than 1/2 of their own support,
    ----- the child must live with you for more than 1/2 of the year, including temporary absences such as being away for schooling, and
    ----- they must be US citizens or residents of the US, Canada or Mexico

    A "foster child" meets this criteria only if the child meets all of the other requirements listed and is placed in your home by a court or authorized State placement agency.
    Requirements for a qualifying relative,
    ----- they must not file a joint return with another,
    ----- you must provide more than 1/2 of the individuals support,
    ----- they must not earn more than $3,500 in income subject to tax during 2008,
    ----- If they are not a relative (as defined below), they must live with you all 365 days of the year
    ----- they are not a qualifying child of another taxpayer, and
    ----- they must be US citizens or residents of the US, Canada or Mexico
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