I am using turbo tax 2007 business to file my company taxes for tax year 2007.
How can I use this same version to file my previous years for 2006 and 2005 tax years?

Hi, lfleary!

I know that your question is somewhat dated now, but I thought that I would place it in a more appropriate topic area so that it might get noticed more and answered the best because of the persons who usually frequent this topic area.

Thanks!

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Originally Posted by lfleary

I am using turbo tax 2007 business to file my company taxes for tax year 2007.
How can I use this same version to file my previous years for 2006 and 2005 tax years?

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For 2005, you need Turbo Tax 2005. For 2006, you need Turbo Tax 2006.

Also you may have difficulty in completing all the required returns for a year, yourself. First try 2007 (you have turbo tax) and see if you can do it. For federal you will complete Form 1120 or 1120s (if S corp), then franchise tax return for the state, then return where the corp is registered.
May be you should contact a CPA.