Previous balance in invoice without SOA

Our customers need thier invoices included previous balance they do not need SOA they need all invoices included this infromation as per below example

Net invoices = 1000
Previouse balance = 500
Due balance = 1500

That’s not possible off-the-shelf in Manager.

To achieve this, you will need to hire a developer to write an extension for you.

Can we make checkbox in invoices for this information like

there is no automatic method for this.
you can manually add the previous due in a custom field and add it to the balance due on invoice.
read the guide Include calculations in custom themes | Manager