Can an employer reduce your pay without notification while you retain the same position/responsibilities?
If promised a pay raise, can that raise then be denied with no just reason?
Yes, employers may cut an employee's wages or salary at will, without notice, regardless of the employee's position, except in the following two situations:
* there is an employment contract, including a union agreement, guaranteeing a certain pay
* there is provable employment discrimination (against a race, religion, gender, age over 40, disability status, etc.) in terms of who gets the pay cut
But barring a contract or discrimination, just as you could be fired at will, without notice, your pay can be cut.
A raise that was contractually agreed to would have to be enforced. Or even a verbal promise IF it induced you to do something that was to your detriment and the employer's benefit, like foregoing some other job opportunity you had. But a mere promise that you should or would get a raise is not enforceable.
I know that this seems harsh but it is probably legal.
Most employment relationships are what is known as "at will". This means that basically the employer can hire or fire someone for any reason or no reason whatsoever, as well has increase/decrease salary/hours, promote/demote, and generally impose requirements as they see fit. In turn, you can work for an employer, or not, your choice.
The only exceptions to the above would be if there is a stated company policy covering this, or there is a union/employment agreement that governs, or this situation has arisen due to some type of discrimination.