I paid a supplier from my bank account without receiving an invoice. Now I have received the invoice, how do I clear this supplier with is in a debit balance.

Hi there, @NG28. I'm here to provide a few steps you can take to clear your supplier's balance.

To fix it, you can edit the transaction payment you made to that supplier and apply it to Accounts Payable. This way, it can be applied as a payment to the invoice you receive from them. To know more information in managing transactions from your supplier, you can visit this article: Enter bills and record bill payments in QuickBooks Online.

Just in case you'll need to charge a client for a cost for a specific service you work for them, you can use the billable expense feature. This will help you manage expenses you incur on your customer's behalf. 

Should you have any other concerns about clearing your supplier balance, you can always post here in the Community. I'm always around to assists you. Have a good one.