Income tax systems generally allow a tax deduction, i.e., a reduction of the income subject to tax, for various items, especially expenses incurred to produce income. Often these deductions are subject to limitations or conditions. Tax deductions generally are allowed only for expenses incurred that produce current benefits, and capitalization of items producing future benefit is required, sometimes with exceptions. Most systems allow recovery in some manner over a period of time of capitalized business and investment items, such as through allowances for depreciation, obsolescence, or decline in value. Many systems reduce taxable income for personal allowances or provide a range of income subject to zero tax. In addition, some systems allow deductions from the tax base for items the tax levying government desires to encourage. Some systems distinguish among types of deductions (business versus non-business).
Read more about Tax Deduction: Business Expenses, Capitalized Items and Cost Recovery (depreciation), Non-business Expenses, Groups of Taxpayers, International Aspects, Further Reading
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“Parents are used to being made to feel guilty about...their contribution to the population problem, the school tax burden, and declining test scores. They expect to be blamed by teachers and psychologists, if not by police. And they will be blamed by the children themselves. It is hardy a wonder, then, that they withdraw into what used to be called “permissiveness” but is really neglect.”
—C. John Sommerville (20th century)