I ,and several others, have noted errors with Form 2210 calculation of underpayment penalty in 2021 version that results in Turbotax saying a penalty is due when it really isn't. Turbotax advertises their results are 100% accurate, but actually only cover cases where the program result is too low and the IRS or state sends a notice of payment due and/or you run the same data through other tax preparation software product and come up with a lower result (and have to pay for the other product to get a correct result). They need to fix their screwed up software when errors are found by users like those in the Community and make it easier for the Community to identify and track the correction of errors with their software so those of us that paid for the product actually get something that provides accurate results.
