Underpayment Penalty - But I paid 100%
In 2018 I made 50k, which required estimated federal tax payments of roughly $1,200 per quarter. So in 2019, I made quarterly payments of $1,200, on time, as recommended by the TurboTax vouchers I received when I filed my 2018 taxes. By the end of 2019 I made a lot more than 50k. And now that I am preparing my tax return for 2019, I see that I am getting an underpayment penalty for not paying 90% of my tax liability for 2019. I thought that I would be safe because I paid 100% of the 2018 tax liability. Is TurboTax correct in assessing an underpayment penalty?