Works great, I have used it for over 10 years. I've never found it to make an error. I like the fact that it fills a lots of the tedious details from last years return. I also like the fact that I can download a lot of the cumbersome financial data from my broker. I also use it to do estimates for next year by starting a new return based on the current years return and filling in the income and deductions as they come along in the current year. It turns out to be pretty good estimate.