I don't know if I can answer that first question - it seems like if they position themselves as providing expert advice and competent filing, and then I pay for

I don't know if I can answer that first question - it seems like if they position themselves as providing expert advice and competent filing, and then I pay for it, I should be guaranteed something. But the world does not really operate on SHOULDs. If I used TurboTax, I would expect to find out they messed up by getting some notification from the IRS, or accidentally discovering later that I missed a deduction. If the IRS was reaching out, I'd engage a real accountant ASAP. If TurboTax missed a deduction, I'd vote with my wallet and use an accountant the following year :) disclaimer: I use an accountant because my tax situation is complicated.