It depends on your tax situation. Here's more info:

You can downgrade using the Clear and Start Over feature but bear in mind that the different TurboTax "flavors" handle different tax situations and their associated forms.

For example, if you want to downgrade from Deluxe to Federal Free Edition and you're itemizing (Schedule A), you can clear and start over with the free edition, but once you enter your itemized deductions in the free edition, you'll be asked to upgrade to Deluxe.

Here is a short list of some common tax situations and the online products that now uniquely support them:

• Itemized Deductions (Schedule A/1040)- Deluxe, Premier, and Self-Employed
• Capital Gains or Losses (Schedule D) - Premier and Self-Employed
• Rental Income (Schedule E) - Premier and Self-Employed
• Profit or Loss from Business (Schedules C-EZ and C) - Self-Employed

If you are looking at TurboTax Federal Free Edition, keep in mind that this version is intended for taxpayers with very simple returns (Form 1040EZ filers with the standard deduction), for example first-time filers and students.

• TurboTax Online Product Guide
• How do I clear and start over?

Some years ago I got a suggestion from Turbo tax to ip grade to Premium. Have i been getting ripped off? Looks like Everything in premium is also in Delux. 

OK ... ALL of the downloaded programs can  handle all the same forms so Deluxe will handle everything ... no need to upgrade to the Premier unless you want  the "extra help" screens in that upgrade.

If you are using the ONLINE version then you may need to upgrade to Premier if you have something the online deluxe will not handle.