Must be printed in Landscape format with instructions on back. Minors under the age of 18 are required to have a work permit prior to starting work.Almost all minors under the age of 18 are subject to California's child labor protections. Filling out the Michigan CA-7 Work Permit is straightforward. Minor labor laws are in place to provide safeguards for people under 18 who are employed and, generally, still attending school. Employers of children under age 18 must maintain a proof of age. Michigan. Must have a completed work permit form maintained at the minor's worksite before a minor begins work. Who Needs a Work Permit? Filling out the Michigan CA-7 Work Permit is straightforward. All minors must obtain a work permit before starting work.