Hi, Jason.
Tax planning and tax return preparation are not the same thing.
Accounting principles are not the same thing as tax laws and rules.
Accounting principles have been developed by professional accountants over centuries, based on logic, reason and pragmatism. These principles change and evolve slowly, deliberately, so that an accounting program can continue to be used for several years, probably decades. Many of the users who post here report that they are still happily using Quicken 2000 or earlier. Tax laws are written by our Congress in Washington, based on political considerations that sway back and forth with the seasons and the latest - and next - election. The laws they pass are explained by bureaucrats and interpreted by judges. They can change several times within a single year and are almost guaranteed to change at least annually. Therefore, tax forms for 2005 cannot be used for 2006 - and a tax program designed to prepare a return for 2005 can't be used for a 2006 return.
A 2006 tax planner based on 2005 - or 2004! - rules would almost certainly get us in trouble. Even if income and deductions in 2006 were exactly the same as for 2005, the amount of tax probably would be different. And all the planning decisions based on that input would be highly suspect. As I recall from years when I used the Deluxe or higher versions. only the current and one following year are usually provided for in the Quicken Tax Planner. I can't guess what will be deductible for tax year 2008; can you? We can't expect Intuit's programmers to predict the moods of Congress for more than one year, either. :>(
Personally, I have the latest Q2007 and TT2006, but only the Basic versions. The last time I tried, a week or so ago, TT would not import the 2006 Quicken data directly. I had to export from Q2007 to a .TXF file and then import that into TT2006. I'm not sure if this was because I'm using Basic, or because Intuit hasn't finished programming for the direct transfer, or because the blurbs on the boxes and in the Help file are wrong.
We should be able to export our tax facts for 2006 from any recent version of Quicken to TurboTax 2006, provided we've done a good job of assigning tax form line numbers in Quicken. But that is not the same thing as using the Tax Planner within Quicken 2005 to plan for 2006 taxes. Remember that Q2005 came out in the Summer of 2004, a full 2 1/2 years before last week, when Congress went home without finalizing some of the rules for 2006.
RC