I have filed my 2018 taxes, on line, and had the return accepted by IRS. No guarantee that my entries on Form 2210 will be accepted. Filing estimated taxes for the year begins by estimating your 2019 taxes NOW. I have somewhat varied income quarter-by-quarter for Q1, Q2 and Q3. My biggest hit comes in December when my RMD is due and all my taxable mutual funds distribute end of year capital gains and dividends. If I do a 12-month average I will wind up paying too much in advance. Turbo Tax should add a feature that assists in making these estimations for the coming tax year. The calculations for each quarter are very complex and the verbiage on the IRS web site will cause you consider leaving the country (joke). It seems to me that Turbo Tax could add this feature in Premier, or offer it for a nominal additional fee.
