What is the name of your state? ohio
Can my employer lower my pay without prior notice?
I recieved my current check and notice that my comission rate was lowered or my pay scale was changed, but I was never notified about this prior to this week.
Whether prior notice is required and if so how much notice is needed is a state specific issue, and offhand I don't know about Ohio. The state DOL will be able to tell you if no one here knows Ohio law (Patty?).
Even if such a law exists, however, that would only mean that you need to be paid the higher rate until the time you were notified, not that it cannot be lowered at all.