Tax deduction is a reduction of income that is able to be taxed and is commonly a result of expenses, particularly those incurred to produce additional income. Tax deductions are a form of tax incentives, along with exemptions and credits. The difference between deductions, exemptions and credits is that deductions and exemptions both reduce taxable income, while credits reduce tax.
The examples and perspective in this article may not represent a worldwide view of the subject. (October 2015)