QB Issue Resolution:

Since you paid here in Q4, because that is when you were able to find out what to pay, the check should be dated in Q4 and so there’s nothing to amend.

Resolution for Issue 'Do I need to amend my Q3 941? If so, how?' available: Yes (Solved).
Source: Intuit Community forum.

Do I need to amend my Q3 941? If so, how?: 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 amend
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