The phrase "deduction amount" refers to the specific sum of money that is subtracted or taken away from something, such as a total cost or income. Full definition
If you won't be able to do that for 2018 because of the new standard deduction amounts, then the popular mortgage interest deduction doesn't really provide any benefit. (thebrokeprofessional.com)
Medical expenses also are reduced by 10 percent of your adjusted gross income, which decreases the tax deduction amount. (sapling.com)
An exemption or deduction amounts in effect to a grant in terms of reduced taxes. (religion-online.org)