<prompt> Human: The current thread on the 100 bonus made me realize that a lot of people dont realize that payroll errors happen. They do, and its up to you to catch them.Heres a quick recent personal experience: I started a new job in September. I didnt catch it until last week that they were withdrawing 10 extra each week 20paycheck for my pre-tax flex spending account. It was no ones fault and a simple error. Not a huge amount, but over the course of the year, its more than 500 towards my daycare costs.A quick email to our new head of HR sorted things out and I had the retroactive funds deposited within 48 hours. These things happen. Glitches happen. Mix-ups happen. Honest mistakes happen. But no matter what, its up to you to notice. Know how your pay is calculated, know what youre supposed to get, verify its all accurate, and then occasionally audit your paystubs to make sure youre getting everything youre supposed to get.If youre confused or not sure, sit down with your HR person or payroll person and have them explain how it works. This is part of their job, so dont be shyembarrassedhesitant to say hey, can you explain this part of my paycheck to me.Anyone else have any stories of catching payroll errors that had to be corrected?  <response>: International students in the US dont pay FICA and Medicare taxes when working on campus, at an internship, or post completion optional practical training before they either leave the country or switch to a work visa. Every single employer gets this wrong. Including on campus employers the University itself gets it right but if you work in the cafeteria for example. Its pretty much a given that your first couple of paychecks will be wrong. When you switch to a work visa, you better follow up and make sure they started taking out those as well. 