do you mean how to pay your estimated tax for 2025 i.e. 1040-ES generally due quarterly, Q3 deadline 9/15 coming up this week?
Turbo doesn't have any role in 'filing' ES during the year, if you're referring to that, you can just pay online at irs.gov if able and make sure to classify it as 1040-ES for 2025.
To calculate how much to pay try some of the online calculators in particular the W4 tool from IRS may be helpful, most tools are not updated yet for 2025 'big bill' changes but it depends whether those changes apply for you. See also Form 1040-ES instructions which has some worksheets to help with estimation, and Form 2210 lines 1-9 for the safe harbor calculation (i.e. you need to pay during 2025 either thru withholding or "timely" (usually quarterly) estimated tax, the smaller of - 100% of 2024 tax [110% if AGI > 150k or 75k for filing MFS], or 90% of 2025 tax).
If you didn't pay Q1/2 ES but your income was steady and you should have paid those, generally you should pay them right away to stop the penalty accruing, there are other options to reduce the penalty such as increasing withholding the rest of the year (not much time left tho) or try to file Form 2210 Annualized Income method but it may only help if your income is backloaded in later quarters. It really depends the specifics of your situation.
