How do I void a check to a contractor? I entered a check twice and now the 1099 counts both entries.

I've got some options on how you can void the duplicate contractor's check, ATU1177.

You can run the 1099 Transaction Detail Report to void the check.

Here's how:

1. Click Reports from the left menu. 
2. In the Search box, type 1099 Transaction Detail Report. 
3. Click the Customize tab. 
4. Select Filter and Choose All as Payment Type.
5. Choose a contractor name in the Vendor drop-down. 
6. Click Run report. 
7. Locate the check and tap it to open the transaction. 
8. Tick the More button at the bottom of the screen and choose Void. 
9. Click Yes to confirm then OK and hit Save and close.

For other ways on how to void a check transaction in QuickBooks Online (QBO), you can refer to this article: Void or Delete Transactions in QuickBooks Online. 

I have articles here on how to prepare and file your 1099's:

• Add contractors or vendors when preparing 1099s
• Prepare and file 1099s
• Common questions about 1099s

Feel free to loop me in if you need a hand with your 1099 or any QBO related. I'm always here to help.