QB Issue Resolution:

No. That is a census collection nu.ber and since you had zero employees during the pay period encompassing the census date the correct entry is zero.

Resolution for Issue 'I have 1 employee. He did not receive a March paycheck before 3/12 so QB online is populating line 1 of the 941 with 0. Do I need to change it?' available: Yes (Solved).
Source: Intuit Community forum.

I have 1 employee. He did not receive a March paycheck before 3/12 so QB online is populating line 1 of the 941 with 0. Do I need to change it?: 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.

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