Question on annualizing income

[Mitzy20]

I need to pay estimated taxes for 2025 but do not want to pay 110% of my 2024 taxes because I would be overpaying what I will likely owe in 2025.  So I am basing 2025 income on 2024 income, minus salary (I retired in 2024).
Basing 2025 income on 2024 is subject to potential underpayment of quarterly estimates, since actual amounts will not be known until the end of the year.  From reading on this forum I understand that I can "annualize my income" to avoid or reduce underpayment penalties.  2025 income will consist of SS income and income from 1099-INT and 1099-DIV. I have entered this info into a new copy of TT and TT has calculated what our taxes due would be (again, based on 2024, less salary).  What input would be needed to annualize this income in the event I underpay? How would I calculate monthly income for 1099-INT and 1099-DIV which are received as lump sum amounts at end of the year? Again, looking for a way to avoid an underpayment penalty in the event that my quarterly estimates do not cover 90% of 2025 taxes.

Thanks 

[DawnC]

Go through the estimated tax payments for next year section.   You will be able to enter your estimates of your 2025 income and deductions to generate accurate estimated tax payment vouchers for 2025.    How to print 1040-ES vouchers for next year

When you get to the screen below - click on Review Now - you will be able to enter your figures on the following screens.  

[VolvoGirl]

Sounds like you have the Desktop program?   You can use the What-If worksheet.  There is a box to check to use 2025 rates.  Go to Forms Mode, click Forms in the upper right or on the left for Mac. Then click Open Forms box in the top of the column on the left. Open the US listing of forms and towards the bottom find the What-if worksheet. It's right under Estimated Taxes.  

Or try…Go into Forms View. Once there, at the top of the left column, click on the icon for "Open Form". A popup window will appear. In the text line, type the word "what" without quotes. You should see "what-if worksheet" appear as a selection choice. Double-click it to launch the form.