I'm trying to plan my taxes for 2018 (note, I have already filed taxes for 2017). I have about $5K of short term capital gains that have not had any tax withholding during the time Jan 1, 2018 - Mar 31, 2018 (as previously referenced here).
Based on the answers in the above-mentioned question, I plan to file Form 1040-ES before April 17 with estimated tax payments to the IRS, and I plan to file this form by hand. Since I live in MA, I expect I'll have to file Form 1-ES to file estimated tax payments to the State (can someone more knowledgeable than me please confirm or deny this?).
When I file my 2018 taxes next year (Form 1040), I plan to use TurboTax. Does anyone have experience using TurboTax after having filed 1040-ES by hand? Is it self-explanatory? I am trying to avoid paying underpayment penalties.