99% of what you will ever need is in the Deluxe. And that last 1% would require very esoteric tax transactions that not many people would be involved in. Only some 25% of tax returns even file a Schedule A (due to a home mortgage).
Deluxe is more than adequate, in some cases "Premier" adds clutter and questions that are seldom relevant and seem to have been incorporated to give the impression that you are getting something extra by upgrading from Deluxe to Premier.
This is exactly the question I always have. I download my investments from the brokerage but there's always a few missing cost basis numbers that I have to track down. I've always used Premier but I'm hoping to just use Deluxe this year. I don't feel like I need advice on my investments, but I need to make sure it will prompt for missing cost basis numbers because it makes a big difference if it calculates that as zero! I have no idea why they're missing. It's not difficult to track them down, it's just time consuming.
I agree with other posters that Premier is unnecessary unless you have a very complicated return. I used Premier one year, but have returned to using Deluxe. I didn't find any advantage in Premier. I have basic return, but investments with different mutual fund companies,and misc income from additional business. I didn't find Premier provided any additional help or info, Deluxe worked just as well for sale of mutual funds and in all other aspects. Maybe my return is not complex enough to warrant using Premier.
I have used Turbo Tax for years and up until last year I used the "Basic" program. Last year when I went to put in the information for ESPP the basic did not have the screens guiding you anymore and I had to upgrade to Premier after I had already purchased the Basic so I feel that I ended up overpaying for the product. This year as I am looking at the box with the description of what it includes, it looks like if you have ESPP transactions then you need to get the Premier otherwise it doesn't include the "special" input screens for the ESPP information.
I'm wondering about this too. I have investment income from multiple stocks & bonds with a single broker and am wondering if Deluxe will adequately interview me for the correct data. Premier adds a bunch of additional features that I don't need, but I'm wondering if the Deluxe's investment income section is inadequate. Thanks for any input from experienced users.