The average tax rate is total tax paid divided by total taxable income.
It shows the share of income that actually goes to tax on average across the full income base.
How It Differs From the Marginal Rate
The average tax rate is not the same as the marginal tax rate.
- the marginal tax rate applies to the last dollar earned
- the average tax rate measures the overall burden across all taxable income
In a progressive tax system, the average tax rate is usually lower than the highest marginal rate faced by the taxpayer.
Worked Example
Suppose a taxpayer has taxable income of $100,000 and total tax of $18,000.
The average tax rate is:
$18,000 / $100,000 = 18%
Even if the taxpayer’s top marginal bracket is 24%, the overall average rate can still be lower.
Scenario Question
A worker says, “My highest bracket is 24%, so my average tax rate must also be 24%.”
Answer: No. Earlier dollars may be taxed at lower rates, lowering the average burden.
- Marginal Tax Rate: Measures the rate on the last dollar earned rather than the whole income base.
- Effective Tax Rate: Often used as a broader practical measure of tax burden.
- Tax Rate: The general concept from which average and marginal rates are derived.
- Taxable Income: The denominator in the average tax rate calculation.
- Corporate Tax Rate: Businesses also compare statutory and effective tax burdens.
FAQs
Why is the average tax rate useful?
Because it summarizes the overall tax burden more clearly than quoting only the top bracket.
Can the average tax rate be higher than the marginal tax rate?
In a standard progressive system, that would be unusual. The marginal rate is typically at least as high as the average rate.
Does average tax rate include tax credits?
It can, depending on how total tax is measured. Credits that reduce final tax generally reduce the average rate as well.