Oncall work is considered hours worked under the State Law. As of January 1, 2019, employers must reimburse employees for all "necessary" expenses.So what's a necessary expense? These laws include protections and regulations for compensation when nonexempt employees are "on call" or on "standby" for their work. The Fair Workweek Ordinance requires certain employers to provide workers with predictable work schedules and compensation for changes. Both California and federal law require that employees be paid overtime when they work hours beyond their regular schedules. Employers in Illinois are required to pay employees for all the time they spend working. Failing to comply with the applicable state and local laws requiring minimum and overtime wages, meal periods and rest breaks, and postings for remote employees No federal or California laws prevent employers from requiring nonstandard work schedules in an employment contract.