Yes, it is legal--not fair, but legal. Generally, for salaried workers, it does not matter how many or how few hours you work: you make the same pay for 25 hours as you do for 75.But there is an exception: if a salaried worker misses an entire day (doesn't work at all) during his or her normal work week, the employer may reduce his or her weekly salary by the appropriate pro rata amount (e.g.one fifth, given the traditional 5-day work week). That is the only time that salaried workers can have their pay reduced, other than with consent (e.g. if they agree to a deduction to repay a loan from the company). Therefore, if you did take a full day off from your usual work week, the employer could legally deduct a days's worth of salary, unless you use some paid time off (PTO) to compensate.