Taxable income is defined as a filer’s gross income from all sources minus any legally allowable deductions and exemptions. For example, for each dependent a filer has, a standard amount may be deducted from taxable income. Each year this standard amount increases to account for changes in inflation and other economic conditions.
The most important decision any tax payer must make is whether to take the standard deduction or attempt to itemize deductions. Often, the standard deduction is higher than what could be subtracted from taxable income by itemization. Itemizing deductions can be a tedious task of accurately recording throughout the year such expenses as interest paid, charitable donations, other income tax liabilities (state and local taxes, for example), property taxes due, medical expenditures, and occupational expenses.
For some filers, their taxable income is too high to claim any deductions or exemptions at all. This is in line with the concept of taxes increasing as taxable income increases. In other words, there is a maximum taxable income under which deductions and exemptions can be claimed at all.