Illinois Tax Levy Computations are calculations used to determine the amount of taxes owed to the state of Illinois. There are two types of Illinois Tax Levy Computations: the Illinois Income Tax Levy Computation and the Illinois Sales Tax Levy Computation. The Income Tax Levy Computation begins with a taxpayer's reported income to determine the amount of taxes owed. This computation takes into consideration deductions, credits, and exemptions based on the taxpayer's filing status. The Sales Tax Levy Computation is used to calculate the amount of sales tax owed on purchases made in the state of Illinois. This computation takes into consideration the product being purchased, the location of the purchase, and the applicable sales tax rate. Both computations are used to ensure that taxpayers are paying the correct amount of taxes.