QB Issue Resolution:

“Can anyone tell me if changing invoice amounts from a previous month would affect the sales tax¬†for the current month?”

Yes, you are changing everything; sales reports, sales taxes, etc. Then, that carries forward.

Resolution for Issue 'Does changing an invoice in a previous month affect the sales tax payable for the next month?' available: Yes (Solved).
Source: Intuit Community forum.

Does changing an invoice in a previous month affect the sales tax payable for the next month?: 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 changing everything sales reports
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Error Recovery for changing everything sales reports [Canada]
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