n00b, it should be 2,500 x 12 + bonus, then minus whatever reliefs you're entitled to (e.g. earned income, wife, children, provident fund). Generally, your CPF contributions can be deducted (as a "provident fund" relief). See http://www.iras.gov.sg/ESVPortal/iit/iit-se-a1.1.6.7+provident+fund+life+insurance+relief.asp