It depends.
If you can prove that your employer cut your pay or reduced your hours simply because you filed a workers’ comp claim, then they can be fined for breaking Arizona employment law that protects injured workers from retaliation for obtaining benefits.
It’s also unlawful for your employer to pay you less because of your disability if you can still perform the basic tasks of your pre-injury position. This is considered disability discrimination and is outlawed by the Americans with Disability Act. Your employer is required to reasonably accommodate your disability, unless they can prove that doing so would cause “undue hardship” to the business.
If, however, you are temporarily given a position until you recover that warrants a lower wage because you can’t perform your normal job functions, then your employer is legally allowed to reduce your pay until you are able to be reinstated to your normal position (and pay rate).
In Arizona, employers have no legal obligation to provide a position for an injured worker who receives a light-duty work clearance from their doctor. If an employer is unable (or refuses) to accommodate a “light duty” worker, then the injured worker must seek other employer in order to continue receiving their workers’ compensation benefits.
While a worker is on light duty restrictions, the worker will continue to receive benefits for lost wages if they remain employer. However, the benefit will be reduced to 2/3 of the difference between what the worker earns on light duty and the average monthly amount earned before the injury.