Children ages 14 and 15 cannot work before 7 am, after 9 pm, more than 40 hours a week or more than eight hours a day. However, employers of minors under age 18 must obtain and keep on file proof of the minor's age.Almost all minors under the age of 18 are subject to California's child labor protections. Minor labor laws are in place to provide safeguards for people under 18 who are employed and, generally, still attending school. 16- and 17-year old high school students may not work after 11 pm on evenings before school days or before 5 am on school days. A comprehensive guide to hiring minors, including a breakdown of child labor laws and proper documentation. JJ Keller offers federal, state, local, and wage order posters for all 50 states, the District of Columbia, and Puerto Rico. Therefore your W2 income is not subject to CA income tax per California law. That's why your employer corrected your withholding in mid-year.