<prompt> Human: So I checked my direct deposit this morning and it was an additional 300 short. I thought my job was screwing me, but when I looked at my payslip I noticed the tax amount was different on this check. I make 55k a year salary and my check amount is always the same. I take home about 1500 biweekly after my 300 federal tax deduction. This time I got 1200 and 600 was deducted. Does anyone have any ideas on whats going on? I dont want this to happen again next check. Losing an additional 600 a month would really suck. Im contacting HR when I get to work.  <response>: As others said, contact HR and sort it out. Submit a new W-4 if necessary. You probably wont get that 300 back until you file your tax return but you should be able to avoid having additional withheld 