Yep. I do know that. 

Thanks for your input but not the answer I was looking for. 

I have found the 2021 941, however, the section of the form where I would mark 'January, February, March' to indicate that I am reporting first quarter 2021, is grayed out. The fact that this is the only quarter that the IRS does not allow to be checked on the current form is causing me to be concerned that this is not the correct revision to use for that period. I have searched and searched for a 941 revision that would apply to Q1 2021 and have come up with absolutely nothing. 

The instructions read as follows:

Check the Box for the Quarter
Under “Report for this Quarter of 2021” at the top of Form
941, check the appropriate box of the quarter for which
you’re filing. Make sure the quarter checked is the same as
shown on any attached Schedule B (Form 941), Report of
Tax Liability for Semiweekly Schedule Depositors, and, if
applicable, Schedule R (Form 941).

However, I am still concerned as to why the IRS does not want us to check the 1st quarter box on the current form, which is why I am seeking some input or reassurance. 

Thanks!