"do I send my customer the same invoice which shows the balancing figure?"

Thank you for your first visit to our forum today, Sajid. I can show you how to send a reminder to your customers showing their balance due.

Great news! You can use the same invoice to notify your customers of their balances. Before sending your invoice, customize the template to include the transaction's history, which contains the total amount and balance due. This way, you can show your customers their outstanding dues.

Here's how:

1. Click on Sales at the left pane, then Invoices.
2. Look for the invoice you want you want to send.
3. Tap on Edit.
4. Select Customize at the lower part of the page.
5. Check the invoice template you're using.  

Once done, go to the Custom Form Styles window to modify the template.

1. Tap on Custom Form Styles from the Gear icon. 
2. Choose the invoice template, then click on Edit under Action.    
3. Go to the Content tab, then click on the middle part of the PDF page.
4. Mark the box beside Show on the invoice under Account Summary.   
5. Hit Done when finished.

After customizing the invoice template, you can now actively send the invoice, displaying the balance figure.

1. Locate the invoice from the Sales menu.
2. Select either Send or Send Reminder from the Action dropdown menu.   
3. Tap Send to continue. 

Also, the system allows you to set up automatic reminders for invoice due dates. These reminders can be scheduled before or after the due date, saving you from manual tracking and excessive reminders.

Alternatively, you may send statements to notify your customers of their outstanding dues. I'm adding this material as your reference: Create and send customer statements in QuickBooks Online.

Leave a comment below if you have follow-up questions while working with your customers' invoices. I'm just a few clicks away to help you again. Have a good one!