Dependents must file a tax return and pay taxes if income exceeds set limits. For 2016, a single dependent under age 65 who is not blind must file a return if any of the following applies:
Whether taxes are owed depends on the nature and amount of the income.
The tax on the investment income in excess of $1,700 (may change after 2007) of a child under age 18, based on the parents’ marginal tax rate and computed on Form 8615.