Invoice 3000.00 payment 3,000.00 invoice canceled. QuickBooks posted the posit -3000.00 as credit to the customer

Welcome to the Community, @oppcameras.

We want to help you with your concerns about the invoice and payment. However, we need more information about the issue to provide the right resolution and to get this sorted out as quickly as possible.

Can you share with us how you cancel the invoice? Also, the deposit, is it coming from the bank feeds section? Any additional details will help ensure a timely solution.

Once payment is linked to an invoice, it'll remain on your account and will show as unapplied payment or credit. If you're using bank feeds, you can match the deposit to the existing transaction you posted.

Here's how:

1. On the left panel, go to Banking.
2. Go to the Banking tab.
3. Choose an account.
4. Go to the Reviewed tab and undo the transaction. 
5. Go back to the For Review tab, then select the deposit. 
6. Filter the date range.
7. Put a checkmark on the posted payment.
8. Hit Save. 

In the meantime, you can check the following articles to learn more about recording payments and matching deposits from bank feeds, as well as handling credits:

• Record invoice payments in QuickBooks Online.

• Categorize and match online bank transactions in QuickBooks Online.

• Handle a customer credit or overpayment in QuickBooks Online.

Please know that you're always welcome to post any questions you have in this space. Have a great day ahead. 

What you did is a common error.  You received a payment and applied it to the invoice.  The payment went into the undeposited funds account.  Instead of making a bank deposit and checking off the payment that was received, you entered a new deposit and credited it to the customer.  You should still have $3000 sitting in the undeposited account.  You have also doubled your income.  Delete your deposit.  Go to banking, make a deposit and check off the $3000 payment.