I've used it for many years and never had a problem. It is like filling in a PDF form but has a "Calculate" button which runs all the math for you (apart from

I've used it for many years and never had a problem. It is like filling in a PDF form but has a "Calculate" button which runs all the math for you (apart from some tables, etc. which you need to look up yourself). So I'm not sure how you would get off by a cent. Federal taxes only. Except for entering in your W-2s by hand, it's pretty straightforward. You can save a PDF copy to your local drive. The nice thing is you save postage and do not have to pay someone to prepare / file it for you.