Gnumeric + fill out PDF's via Adobe + print + sign + mail
For many years now I have done our taxes with Gnumeric on my Amiga computer (which have evolved). We do a couple of the worksheets + the forms we are required to file. It gets easier to do every year. It *is* a pain when they insert new rows in the forms!
Once that is done, we use my wife's macAir with Adobe to fill out the IRS PDF files and print those. We sign the 1040 and mail it in.
I tried the online free Tax programs, but they were too much of a straight jacket.
Strictly as an aside, I understand a little better how what is going on with their calculations.