Retirement tax questions

Just to add to the above posts - I have the downloaded version of TT so I can create as many returns as I want - to estimate my taxes for the next year when I have significant changes, I do a dummy return in the current year software with my estimated income for the next year - there may be a few changes in some phase-outs, etc., but this gives me a ball park number to pay in estimates or budget my taxes for the next year.