QB Issue Resolution:

You never add to the Aging Invoice; adding it there implies it was part of that sale originally, and you just revised your historic financial data, including sales tax reporting.

Assessing late fees or finance charges are New Activities, with current dates.

Resolution for Issue 'can interest chages be automatically added to aging invoices?' available: Yes (Solved).
Source: Intuit Community forum.

can interest chages be automatically added to aging invoices?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for aging invoices
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Error Recovery for aging invoices [Canada]
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