A summer job is a great way for teens to earn extra cash, but it also comes with tax responsibilities. Anyone with self-employed income over $400, such as earnings from mowing lawns or babysitting, must file an income tax return and may owe self-employment tax. If a teen works for an employer that withholds payroll taxes, the filing threshold is higher: $16,100 for 2026. In this case, the teen usually won’t owe income tax and may receive a refund if taxes were withheld. Contact us with questions.