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With the keywords "Taxable income" go to GOOGLE search, and the first website it points you is THIS
Investopedia, the Internet page https://www.investopedia.com/terms/t/taxableincome.asp
Taxable income is the amount of income used to calculate how much tax an individual or a company owes to the government
in a given tax year. It is generally described as gross income or adjusted gross income
(which is minus any deductions or exemptions allowed in that tax year).
$75000 MINUS $18000.
3 minutes search in the Internet.