Thanks for joining this conversation, @Dave631.

Allow me to hop in and share information about entering a deduction on your contractor's check in QuickBooks Online (QBO).

I tried replicating this on my test account, and I was able to enter a negative amount on a check. Are you getting any specific error messages when doing this on your QBO account? Any additional information will help me provide the best resolution.

Here's a sample screenshot from my test account.

In the meantime, let's sign in to your QBO using a private browser (incognito). There are times that the browser is already full of frequently accessed page resources (cache and cookies), causing some unusual responses.

Here's how:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).

Once logged in, try to create the check again to verify.

If it's successful, return to your default browser and perform a clear cache to refresh the system. However, if the issue persists, try using other supported browsers.

For more information about managing and creating contractor checks in QBO, you can refer to this article: Pay a contractor with a paper check.

I also recommend visiting our website for more tips and other resources you can use in the future: Self-help articles.

Please post again or leave a comment in this thread if you have additional questions about this or anything else QuickBooks. I'll be here to help. Stay safe always.