You’re asking why the total amount owed stays the same regardless of whether the cost basis for your RSU sale is 0, or if it’s 1000000, right?
As the experts stated previously, the cost basis is going to influence the Capital Gains part of your taxes.
If you lost over $3k in Capital Losses this year, then it doesn’t matter what your cost basis is for those RSUs. https://www.investopedia.com/articles/personal-finance/100515/heres-how-deduct-[product key removed]...
If these RSUs are the only thing you sold all year, and the loss wasn’t greater than $3k, then the cost basis should definitely impact something if you’re earning that much. Maybe your version of TurboTax has a bug. Intuit’s platforms have a lot of problems. Often times the amount owed changes after refreshing or signing in and out.
