How can I start my 2019 taxes with TurboTax? I've completed 2018 with the free version, but my wife changed jobs and is now an independent contractor.

[VolvoGirl]

Do you need to prepare estimates for her?
To prepare estimates for next year  you need to be in your current return.  If you can't get your return open, Try this, you can sign back onto your account,  click on Add a State.  This should get you back into your return.  Be very careful not to change anything in your  actual  return.  

You can just type W4 in the search box at the top of your return , click on Find. Then Click on Jump To and it will take you to the estimated tax payments section. Say no to changing your W-4 and the next screen will start the estimated taxes section.

OR go to
Federal Taxes or Personal (Home & Business)
Other Tax Situations
Other Tax Forms
Form W-4 and Estimated Taxes - Click the Start or Update button

When you get to the W4 and Estimated Taxes section, say you want to adjust your income to go though all the screens.

[Bsch4477]

The 2019 program will not be available until about November, 2019.