Hey there, rwstruckinc.
Thank you for taking the time to reach out here in the Community. I'd be glad to show you how to find out the date an invoice was paid.
This can be done in just a few steps. Here's how:
1. Click the Sales tab in the left navigation bar.
2. Select Invoices at the top of the page.
3. Locate the invoice you'd like to view in the list and click to open it.
4. If payment has been received, the invoice will have Paid marked as the status in the top right corner.
5. Below this status, there will be a blue link showing 1 payment made and the amount. Click this link to view the date when the payment was applied.
With this info, you'll be able to determine when your invoice was paid. I'm only a comment away if you have any other questions. Take care.