To answer your second question....not advisable with "Online" tax software since you could irreversibly screw up your tax file. You'd have to remember exactly how you answered every question in your original tax file so that it could be set back to the original setting....and 99.9% of us have no such photographic memory.
With the "Desktop" software, you could save your original tax file to a second test file, and go thru all the questions again in the test file to see if you answered properly and check how your answers affect the $$ that end of being entered entered on every form line. The most major area that can get messed up is answers to the follow-up questions for 1099-R form entries.....but other areas can have confusing Q&A's too.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
