<prompt> Human: Hi guys, Ive been trying to figure this out for a while now. I am getting paid semi-monthly working for a small startup for the past 5 months. Now for the past months, my semi-monthly check has been the same amount every time even for December and October which has 31 days. Now my question is, why do I get paid the same for the months that only have 30 days and months that have 31days? If I worked a extra day in October and December, I should be getting paid that day also, no? My last check from 2015, has the date 123115 however the check is the same amount as November 113015. Can someone please ELI5 to me and the whole community how this is calculated?  <response>: Your salary divided by the number of pay periods. 12,000 24 500 per paycheck, regardless of the number of days. You also wont be paid less in February. 