customer sent us two checks

Hello there, @firechaser.

I'm here to share some insights on how you can record your transactions.

To create a deposit to record the 2nd check you received for the invoice that has been paid, here's what you'll need to do:

1. Go to the Banking menu at the top.
2. Select Make Deposits.
3. In the Payments to Deposit window, click OK.
4. In the Make Deposits window, enter where you want to deposit the money in the Deposit To field.
5. Enter the Date and Memo.
6. In the Received From column, select the customer. 
7. Check the deposit total. Make sure the account and selected payments match the deposit slip from your bank. Use your deposit slip as a reference.
8. Click Save & Close.

To create a credit memo, see the below steps:

1. Go to the Customers menu at the top. 
2. Select Create Credit Memos/Refunds.
3. From the Customer:Job drop-down, select your customer.
4. Enter the items you're giving credit for.
5. Choose Save & Close.
6. In the Available Credit window, choose what you want to the with the credit.
7. Click OK.

For more information about the process above, see the below articles:

• Record and make bank deposits in QuickBooks Desktop
• Give your customer a credit or refund in QuickBooks Desktop for Windows

For future help, here's an article that you can use when reconciling your accounts: Reconcile an account in QuickBooks Desktop.

Keep me posted if you have other questions about managing your transactions in QuickBooks. I'll be around to help you again. Stay safe and have a good day.