Invoice has been paid by client but not showing as paid on QuickBooks

Hi there, Simon. 

Once your customer pays you, you'll need to manually record the payment by selecting the Mark as paid feature. This ensures open invoices will show as paid. Let me show you show:

1. Go to Invoices on the left panel.
2. Find the invoice. Then, click the drop-down arrow next to Send.
3. Select Mark as paid.

If you've done following the steps above and still the invoices are not showing as paid, sign in to your QBO account in a private browser. Once logged in, check the invoice. If it's not as paid, return to your default browser and perform a clear cache to refresh the system. If the issue persists, try using other supported browsers.

Once everything is in order, check out this additional link about reconciling an account. This helps you resolve any differences in the account balances.

Don't overwork yourself. You can always get back to us by replying to this thread. We'll make sure to respond to your banking or QuickBooks concerns as soon as we can.