I received a 1099-INT tax form for receiving interest on my savings account. When adding the information for box (state). Texas is left out so I can't proceed.

Texas has no state tax, so there should not have been any state tax withheld for Texas. If the box is blank, leave it blank. 

I can't leave it blank, though. It shows up as  a required field. When I leave it blank, my 1099-INT form shows up as incomplete and I can't proceed to finish my tax return.

 

I would enter $0 for the box if the program is requiring an entry.

 

If the $0 entry does not work, I would delete the form, sign out/close the program, and then try again. 

 

To Delete Form 1099 INT in TurboTax Online:

• In the left-hand black menu, choose Tax Tools then Tools.
•  Click on Delete a Form from the window that pops up.
•  You should now see the Review Form List. Scroll down the list and click Delete on Form 1099INT.
• You may get a pop up telling you additional worksheets and forms are being deleted. Approve and click delete.
• You should come back to the Review Form List. Scroll to the bottom and click Continue with My Return.

 For more information about deleting forms in TurboTax online, try this link.