Pennsylvania underpayment penalty

After filing my 2018 state return, I received a letter in June 2019 requiring a penalty of of $21 for underpayment of my state taxes. Why didn't TurboTax calculate this correctly? Very disappointing.

posted

Sorry it's common and expected for the IRS or state to bill you for some interest or penalty. It's based on exactly when they get your tax due payment. Turbo Tax doesn't know when it will get paid. And even if Turbo Tax calculates it, it is just an estimated amount.