All estimators are just that - an estimate.
They are using 2020 tax rules to try and guess what your taxable income and tax will be in 2021. This is a process with assumptions and guesses. Do each of these estimators use the same assumptions?
I would be astounded if all three estimators came up with the same answer, except in the simplest of cases.
At least you can be relatively confidant that you know what your tax burden will be within a 20% margin of error - maybe.
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