How to find previous year effective tax rate

[Texas Roger]

Look at your previous year tax return. Your effective tax rate is your total tax divided by your taxable income. In our example, your tax bill is $11,017 and your taxable income is $70,000. Your effective tax rate would be $11,017 divided by $70,000, or 15.7%. Your taxable income is on line 15 of form 1040.