There are some deductions you can take in addition to the standard deduction (student loan interest, moving expenses, some education expenses, etc). These all

There are some deductions you can take in addition to the standard deduction (student loan interest, moving expenses, some education expenses, etc). These all change the adjusted gross income, from which the standard deduction (or itemized deduction) is subtracted. edit: I suppose some of this could be pre-computed if all the different companies sent the info to the IRS and states you lived in during the year. But that's probably too much work...