How do I delete a payment, that was already saved and closed on an invoice The customers check was returned for ISF.

You have to unlink the bounced check from your customer to delete the payment, Peyton. I have the steps to assist you with this.

Insufficient Funds (ISF) occur when an account doesn't have enough money to cover a transaction. In such cases, the bank will prevent the transaction from being processed. To resolve this, please follow the steps below:

1. Recategorize the bounced payment to reopen the original invoice.
2. Unlink the bounced check payment.
3. Send a Statement to your customer.

For a detailed steps, please visit this article: Record a returned payment or bounced check in QuickBooks Online.

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Here's an article you can refer for guidance if you need to enter a bounced check in QuickBooks: What to do if your check bounces and your bank account has non-sufficient funds.

Please don't hesitate to get back to this post if you need further help in deleting a payment linked to an invoice, Peyton. The Community space is around to help you.