I have a client that is making monthly payments on an invoice. How do i invoice him each month without duplicating the balance owed?

A pleasant day to you, @dawna-peacefuldi. We're glad that you've chosen to ask for help here. No worries, I'm here to help you create a monthly invoice for your client without duplicating the balance owed.

To begin with, let's expound on what we'll be performing before digging down to the steps.

We can create recurring invoices for your client because this will not duplicate the balance owed. Thus, it will generate another invoice transaction monthly with the exact details.

What's good about this is we have the option to make it a Scheduled, Reminder, or Unscheduled one. Another great thing is there's a choice to send the invoice email automatically.

To start, you can follow the steps below:

1. From the Gear icon, select Recurring transactions below the LISTS column.
2. On the upper right corner, click the New icon.
3. A prompt will show. Tap the Transaction Type dropdown. Choose Invoice. Then, OK.
4. Enter a Template Name. On the Type field, select either Scheduled, Reminder, or Unscheduled. Then, in the Create days in advance, type in the number of days you want to generate the invoice automatically.
5. Select the Customer, and type in the Email. And on the Options field, choose if you want to Automatically send emails, Print later, Include unbilled charges, or you can select it all.
6. In the Interval dropdown, select Monthly. Enter the necessary information, such as what day and how many times a month. Then, input the Start date and end.
7. Type in the necessary info below, then Save template.

After saving it, the invoice will automatically be created monthly, depending on the details you enter.

Additionally, to help you personalize and add specific info to your invoice form or any sales forms, you can read this article:  Customize invoices, estimates, and sales receipts in QuickBooks Online.

We're thankful to have you here. Hopefully, you'll always come back every time a question about QBO comes to your mind. We're willing to share our expertise and answer your questions. Take care, and have a great day!

If you've created one invoice and are receiving monthly payments, then creating multiple invoices doesn't make any sense.

Instead, you can either re-print the invoice - using a template set up to show the balance due - and send it to the customer after recording a payment, or create a customer A/R statement, which can show the invoice and the payments and the balance due.