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In determining effective tax rate,the numerator is the tax owed and the denominator is the taxable income, correct? I saw this formula online, plugged the numbers in and was surprised to see it was 31%! Just wanted to check to see if I am doing this correctly.

Also to do a back of the envelope calculation of how different part time jobs might affect my taxes or eliminating the mortgage or increasing charitable donations might affect my taxes is it better to go with the effective tax rate or marginal rate? I may or may not have to pay estimated taxes this year and am trying to figure out the best method to know how much to contribute.

I've been playing with turbo tax to test out some scenarios but I don't really find it user friendly in the sense that I am looking for something that will provide me with an overview sheet, review or summary sheet of the different scenarios I'm making. All it ever shows is either a refund or tax owed. It's also difficult to delete data to re-enter new data which is frustrating.

Are there any other tax software or online calculators that you all are using for the purpose of tax planning?
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