Do minors have to pay union dues?

Yes - if a minor works for a company that is unionized (as are many grocery stores) they are required to pay union dues whether they join the union or not. Note: these are fixed amounts, not % of pay. When a minor, or anyone, works at one of these companies part-time and for minimum wage their salaries can be reduced by >20% from these dues. If you think I'm wrong, have your child work at a Kroger grocery store.