I entered my quarterly taxes paid in Turbotax for the state of NC. TurboTax failed to pass one of the payments into my state tax return.

It depends. You must enter the correct date to flow thorugh your state income tax return.  You may go back and check payment #2.

• In Turbo Tax Screen, click Tax Tools, then Tools.
• UnderTools Center. type in search bar Estimated Payments and click go.
• Jump to Estimated and Other Taxes paid and will display estimated taxes boxes.
• Click yes on "Did you pay estimated taxes in 2020?".
• Click State estimated taxes paid in 2020, click start.
• Click yes on "Did you pay state estimated taxes in 2020?".
• Enter State estimated payment #2.

Estimated is the method used to pay tax on income that isn't subject to withholding on earnings from self-employment, rents, interest, and other investments  Generally, estimated payments are divided into 4 quarter payments.  Estimated tax is used to pay not only income tax, but other taxes such as self-employment tax and alternative minimum tax.

Check the state in the drop down box.

You enter state estimated payments under the federal side (because they can be a federal itemized Deduction).  THEN after you finish filling out the estimates under Federal you need to click on the State Tab at the top and start the state return over for it to update.

You have to pick the right state from the drop down box and enter the right payment dates.