Mistakes can happen!
If you have multiple invoices for the same amount for different customers, payments can accidentally be applied to the wrong customers.
The more open invoices there are, the greater the chance of applying a payment to the wrong invoice, customer, or both.
Sometimes, the payment amount was accidentally modified, leading to discrepancies in the open balance. In other cases, a payment may not be linked to any invoice.
When a payment is received and applied to the wrong invoice or customer and has not been matched to a deposit, it's a quick and easy fix. Open the payment that is incorrectly applied and edit.
If the wrong payment has been matched to a deposit already added from the Banking screen, follow this process:
If a payment amount is incorrectly entered, the process is to simply edit the payment.
However, if the payment has been deposited and reconciled, the deposit must be corrected. Here's how to fix if that's the case:
Depending on what account was used when receiving payment in QuickBooks Online, unapplied payments appear on the balance sheet report as undeposited funds or in the bank register as an uncleared transaction.
Either way, the payment has not been applied to an invoice or the amount is an available credit.
If there is an open invoice balance, apply the payment and select the invoice to which it applies. If there is no invoice, one needs to be created.
If a customer underpays an invoice by a small amount, you can either request the additional money or, because it is a small amount and would cost more resources to collect, choose to write off the balance.
The same can be said if they overpay if there is an agreement between you and your customer. The process is simple and is another way to keep clean customer balances.
This is the simplest way to zero those small balances in QuickBooks Online. Open the invoice and add a line item using the same product/service originally used, or create a new item for write-off purposes.
If writing off an underpayment, enter the amount as negative; if it is an overpayment, record a positive amount.
This option is commonly used in QuickBooks Desktop but also works with QuickBooks Online.
Viewing the Customer Balance or the A/R Aging report also lists transactions that need attention. Whenever applicable, we recommend recording a transaction in QuickBooks the same way it originally occurred.
When in doubt, it is still best to seek advice from your accountant, especially for unusual scenarios where a new account is needed.