It depends. If you received some sort of compensation or if you are referring to a deduction like medical related, you can start with the free edition. In the program, as you start entering more information, if needed or required, it will prompt you to upgrade to the next level of the product ( For example, like Deluxe, Premier or even Self-Employed version) that will fully support your situation. Just follow prompts, it will guide you through to complete your filing.
For more information about medical deductions, click here: Medical deductions
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Or you could try Free File:
If you qualify to use it, there is another full-featured free version of the software:
Try Free File:
You qualify if your income was $39,000 or less, or $72,000 or less if active duty military, or if you qualify for Earned Income Credit