The Turbotax Estimated Tax calculator does not seem to handle SS income correctly. I used it last year to estimate my SS + IRA dist. income and paid $5000 to much in taxes.
The estimated calculator from TurboTax was recently updated. Use our calculator any maybe run a comparison using another online version via a Google search for 2018 estimated tax payment calculator.
Click the link below to get started.
You may also calculate your estimated taxes from within the TurboTax software as well as prepare 1040-ES payment vouchers by following these TurboTax FAQ steps:
Rest assured that TurboTax 2017 uses the 2018 tax rates recently passed by Congress and signed into law when calculating your 2018 estimated taxes."
[Edited 3.19.18 | 1:20 PM]