Need to record overpayment to supplier in error. Must be visible on supplier a/c as money in credit, to be allocated to next supplier invoice when received in future. TY.

Thank you for raising this concern here, @dawn107.

I'll be guiding you on how to record the overpayment you made to your supplier and reflect it as a credit to their account.

If the supplier doesn't have an outstanding bill, let's create an Expense or Cheque transaction for them. This will result in a supplier credit in your books and can be applied to future bills. 

1. Click the +New button.
2. Choose Expense or Cheque.
3. Pick the name of the supplier/vendor.
4. Enter the Category details or Item details info. 
5. Click Save and close.

In this part, let's ensure that the expense or cheque transaction you created reflects credit under the supplier's account. You can go to their profile and check the Open Balance. If it shows a negative balance, then, this will automatically apply to the next bill payment.

Additionally, to ensure that this credit will show when the time comes you'll reconcile transactions for this month, you can create a bank deposit. 

Moreover, I suggest reaching an accountant to further guide you in placing this transaction to correct accounts and avoid book discrepancies.

Also, you can read this article to ensure that your accounts in QuickBooks always match your bank and credit card statements: Reconcile an account in QuickBooks Online.

Let me know if you have additional questions about managing your overpayment and supplier's credit by leaving a reply below. We'll be willing to assist you. Take care, and enjoy the rest of the week.