Why does my invoice to my customer say unpaid, but my customer has proof showing he’s paid the invoice?

How did your customer pay?   did they pay using qbo payments?  Did they pay by check?  Did you enter the payment and clear the invoice?

Lynda

Let's perform some troubleshooting solutions to mark the invoice as paid, christopher-k-sh.

We can review the applied payment to all the invoices in QuickBooks Online (QBO). Let;s make usre the Receive Payment transaction is linked the correct one. If not, we can delete it and apply the payment to the right invoice.

Here's how:

1. Click Sales from the left menu.
2. Choose Invoices, and click the invoice to open it. 
3. Under Payment Status, click the 1 payment link and click on the Date hyperlink.
4. Click the More tab and choose Delete.
5. Click Yes to confirm.

Then, enter the payment again to the correct invoice. Just follow the steps and details in this article: Record an invoice payment.

If the invoice payment is entered through Bank Deposit instead of Receive Payment, we need to link them to an invoice. Doing this will mark the transaction as paid.

You can refer to How to link a deposit to an invoice article for the detailed steps.

I've got a link here that provides you with articles about managing customer payments: Manage payments. 

That's it! Please know that I'm just a post away if you need a hand with creating recurring transactions or any QBO related. Wishing you and your business continued success. 

Please help once I delete the invoice I don't understand what you mean after that

Hello, Tsmith4.

I'd like to clear some info shared above.

The steps provided by my colleague RCV is to delete the payment linked to an incorrect invoice. If your invoice shows unpaid, but want to know where the payment went, you can run a report called Invoices and Received Payments.

1. Go to Reports on the left panel.
2. Type Invoices and Received Payments in the search field. 
3. Select the Report period.
4. Find the payment. 

If in case that the payment is linked to an incorrect invoice and is recorded in the Receive Payments window, all you have to do is change the customer's name.  

Here's how:

1. In the Invoices and Received Payments page, click the Payment to edit.
2. From the Customer drop-down menu, select the correct customer.
3. Under the Outstanding Transactions section, put a check mark on the correct invoice.
4. Click Save and close.

Once done, run the same report again and check if the payment is applied to the correct invoice.

In addition, you can check read these articles for more information about the different reports in QuickBooks Online and how you can customize them:

• Reports included in your QuickBooks Online subscription
• Customize reports in QuickBooks Online

Please keep me posted on how things go after giving this a try. I'd be glad to help you out again. Stay safe.