Form 8615, Tax for Certain Children Who Have Unearned Income
For children under age 18 and certain older children, unearned income over $2,100 is taxed at the parent's rate if the parent's rate is higher than the child's. If the child's unearned income is more than $2,100, use this form to figure the child's tax.
Form 8814, Parents' Election To Report Child's Interest and Dividends
Parents use this form to report their child’s income on their return, so their child will not have to file a return.
Publication 929, Tax Rules for Children and Dependents
This publication explains the filing requirements and other tax information for individuals who can be claimed as a dependent on another person's tax return. It also explains how to report and figure the tax on investment income of certain children (whether or not they can be claimed as dependents).