In next week’s edition of the Washington Examiner magazine, I will have a comprehensive analysis of former President Donald Trump‘s rumored proposal to replace our current income tax scheme with tariffs on imports, but before explaining a position for or against the plan, it’s important to explain the math at play here.

In the last fiscal year, the federal government collected $4.4 trillion, a whopping $2.2 trillion that came just from federal income taxes. Another $1.6 trillion came from payroll taxes, $420 billion from corporate income taxes, and just $80 billion from customs or tariffs. This revenue totaled 16.5% of America’s gross domestic product, on par with the 16.6% average from 2003 to 2022.