K1 K1 Reference Number ?

That K1 box is actually part of a new update QuickBooks just rolled out. Since it's so new, there isn't a setting to turn it off or hide it right now.

Leaving it blank won't mess up your books, cause any errors, or affect your reports at all. Since it really is just extra clutter, you can send your feedback directly to our product development team by following these steps:

1. Click the gear icon at the top of your screen.
2. Select the Feedback option.
3. Type in your comments and hit Submit.

If you have follow-up questions, please don't hesitate to click the Reply button.