Get your taxes done using TurboTax

I assume many will get this this year?

I've never had to estimate taxes and the only reason there is insufficient withholding is we filed for unemployment for part of the year in 2020 and had the stimulus payments. why would there even  be a penalty in this situation? There would be no cause to make an estimated payment. Wouldn't you just pay the tax on the unemployment and the stimulus as regular income?