Got a CP04 from the IRS, requesting to file 15109.

[Charleslsne]

I got a CP04, requesting a 15109. 

I didn't ask for any deferment, and have filed and paid taxes due already. why would I receive this request?

[DMarkM1]

If you were serving in a combat zone many times the military admin office will notify the IRS en masse of the personnel in theater to start the deferment request. 

First check the tax year.  Is it for 2019 or earlier?  Confirm you have filed and paid for the year indicated on the notice.  If you paid any penalties due to late filing/paying perhaps filing this form 15109 due to serving in a combat zone will get those refunded. 

Use the contact information on the IRS notice to contact the IRS for to get an explanation and let them know what you have filed already.   

[Charleslsne]

thank you for the response, I finally contacted the IRS. 

the CP04 was for 2020. we have already filed and paid all tax due for 2020. The IRS however told me that we have to file the 15109 "request for tax deferment" even if we don't want to request tax deferment. that seems counter-intuitive to me still (why do they call that a request for tax deferment if we are not requesting it). they basically need to have the dates for the combat pay. 

thanks again