There's four things you can think about.
1. The Turbotax TaxCaster (linked by the other experts). Note this uses 2023 laws and deduction limits, but the changes for 2024 are not currently expected to be major.
2. The IRS withholding estimator will also calculate your estimated tax, using 2024 rules and limits.
https://www.irs.gov/individuals/tax-withholding-estimator
3. You can use Turbotax online, but there are limitations. Turbotax is "free to start" and you only pay when you file, so if you make a test return and play around with the numbers, it will be free as long as you don't go all the way and commit to filing. You need to make a new online account with a different user name and password so you don't contaminate your actual file with your experiments. And, the program will use 2023 laws and limits.
4. If you already bought Turbotax 2023 to install on your own computer (from a CD or download) you can make as many experimental files as you want, with different file names so you don't mess up your actual 2023 return. You can also use the "what if" worksheet in the desktop program.
There is no version of turbotax that can help with the special social security rules that reduce your benefits if you declare your benefit but keep working, for that you need to see a proper financial planner.
