By Pat Southern. Last updated 2011-03-29. Of the many men who led Rome, only a handful can truly be said to have profoundly and fundamentally shaped the empire's structure and direction. This gallery introduces six of the most important Roman emperors.
Tax Liability. The amount of total tax due the IRS after any credits and before taking into account any advance payments (withholding, estimated payments, etc.) made by the taxpayer.
What's your AGI? Adjusted gross income (AGI), or your income minus deductions, is important when calculating your total tax liability. It not only determines your tax bracket, but also tells you which credits you qualify for and how much you're able to contribute each year to your tax-deferred retirement accounts.