QuickBooks won't let me mark invoices as paid. When I try to mark an invoice as paid and select the corresponding payment, I get "error - could not link transactions"

I understand that you've been experiencing this for a month, Sam. We'll fix this together you'll be able to choose and make the invoice paid.

Before that, may I know if you've already performed the browser troubleshooting step? If not, I suggest deleting the cache history so the system can start fresh and pinpoint any possible issues with the webpage.

We can also explore other supported browsers to enhance your experience with QuickBooks Online. This could be caused by data corruption, improper mapping, or browser issues.

Once done, go to your invoices to match the transaction. Please note to cross-check the invoice and transaction details (such as amount, date, and payment method) for accuracy.

If you've gone through those steps and the problem persists, I suggest contacting our Phone Support team. They will be in the best position to conduct further research on the error code you are encountering and provide a solution so that you can successfully link invoices and mark them as paid.

Here's how you can get in touch with them:

1. Sign in to your QuickBooks Online company.
2. Click the Help icon.
3. Select the Assistant tab to get help from the QB assistant, or choose the Search tab to enter your question and find Help articles.

Please make sure to review their support hours so you'll know when agents are available.

If you have more questions or concerns, please leave a reply below. We'd be happy to provide the necessary help.