if you have the desktop app, why not just use it? There is no limit to the number of returns you can create with the app. Just make sure to save the file clearly indicated as an estimate so you don't accidentally file it. It's not perfect because some items have not been updated for the changes in the 2024 tax laws.
Or use the inline calculator. I'm not sure if it's more accurate than the desktop app. You could always compare the two results
https://turbotax.intuit.com/tax-tools/calculators/taxcaster/
