Let's say you have $100,000 of taxable income for 2019.
The first $9,700 is taxed at 10%. So you pay $970 on that.
The amount from $9,701 to $39,475 is taxed at 12%. So the tax on the additional $29.775 of income is $3,573. So far, total tax paid is $970 plus $3,573, or $4,543.
The amount for 39.476 to $84,200 is taxed at 22%. So the tax on that additional $44,725 is $9,840. So not the total taxes incured is $14,383.
The amount from $84,201 to $100,000 is taxed at 24%. So the additional $15,800 at 22% incurs $3,950 in taxes, bringing the total tax liability for $100,000 to $18,333.
So your total tax liability on $100,000 of taxable income is $18,333 which is 18.3%. Your "blended" tax rate is 18.3%
