Hello, @SWRG.

Thanks for the prompt response. I’m here to share some information about the Discount Date box.

I created a bill using my sample company file. I chose 1% 10th Net 30 as the Payment Term and the Discount Date box fills out automatically.

If this is not the case on your end, you need to review the Terms List and check that they are all defined correctly. Here's how:

1. Go to the Lists menu and select Customers & Vendor Profile Lists, then choose Terms List.
2. Double-click the term.
3. Check the setup and edit if necessary.
4. Hit OK.

If you’re still experiencing the same problem even after ensuring the set up is correct, let's run the Verify and Rebuild Tool. This fix data damage on the company file. 

Rebuild Data:

1. Go to the File menu.
2. Choose Utilities, then select Rebuild Data.
3. Select OK on the QuickBooks Information window.
4. Follow the prompt to save a backup.
5. When you see Rebuild has completed, click OK.

Verify Data:

1. Go to the File menu.
2. Choose Utilities, then select Verify Data.
3. If you see QuickBooks detected no problem with your data, click OK. You can continue using the company file.
4. If Verify finds an issue with your data, you’ll be prompted to Rebuild Now or View Errors.
5. Select Close.

See resolve data damage on your company file for more information.

That should do it. Let me know if this works out for you, and if I can be of additional help. Take care!