How does one determine what percentage of Federal income taxes one is paying?

Is there a set formula, for example, if you earn X amount of dollars, you pay... or , is it set more like .20 of every $1.00?

Public Comments

1. here is the schedule of marginal tax rates http://www.irs.gov/formspubs/article/0,,id=150856,00.html because it is a progressive schedule, you can't simply do the calculation that you proposed To find your average tax rate, calculate your tax liability & divide by total income.
2. Check out this website for Federal Tax rates. I'm sure you can find a similar one for your own state and local taxes. http://taxes.yahoo.com/rates.html