To prepare estimates for next year you need to be in your current return. But be careful not to change anything in your actual return.
In TurboTax Online, sign in to your account.
Select Tax Home in the left menu.
Scroll down to Your tax returns & documents.
Select 2021, and then select Add a State (you're not actually adding a state, this just gets you back into your return so you can make changes).
Search by typing in W4. Hit the Enter or Return key to get the Jump to w4 link to show up. Go to the W4 page and it will ask if you want to Change your W4. Click on NO. The next page will start the Estimates.
