Hello @mary555,
A negative balance on your WIP account can be caused by a duplicate invoice. The number of invoices may have exceeded the total number of payments created.
This time, let's review the invoices of your reports to fix the negative balance of your account. From there, you can link a job to the invoices or delete them if they're duplicate copies.
In case you need some related information and best practices to record your future transactions, you can visit our Reports and Accounting articles for reference.
Please touch base with me here for all of your QuickBooks needs, I'm always happy to help. Thanks for dropping by.