Get your taxes done using TurboTax

Do you have a full PC or Mac?   The CD/download software lends itself to making such comparisons much more efficiently than trying to use the online software to compare.   But---if you are stuck with using online then each of you needs to try preparing your own "single" returns and also prepare a MFJ return, then do the math.  It will take three online accounts--one for each single return and one for the joint return.

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