This is constantly brought up on HN in the WFH threads. Your employer cannot arbitrarily reduce your salary. The reduction has to be agreed upon by the employee or the employer has to terminate employment and rehire to reduce salary. Very few big tech companies will update salary for a intra country move. It seems to happen most often when an employee relocates to a new country rather than a new state. This is becaus…
There might be state regulations to this effect -- and IANAL -- but there's no such federal law in the US. An employer can cut an employee's pay at any point to any value above the minimum wage, as long as they inform the employee their pay has been cut.