I'm in the same situation. I couldn't get the "help" to post my questions yesterday. See this resource- which seems to imply you potentially could go either way in 2020 in KS and MO but in 2021 must report remote income from the state your are telecommuting from:
https://www.hodgsonruss.com/assets/htmldocuments/Telecommuting_5.22.20.pdf
I am NOT a tax pro. The guidance on this is poor- probably because 50 states all have their own approaches (or non-approaches). When I apportioned my time by work location I got a penalty from KS for underpayment. So much for the statement about waiving penalties in the KS guidance!! Unless the software isn't up-to-date for this? Messy!!
If a tax expert sees this- in my case MO employer chose to continue to take out MO tax for entire year- citing the MO guidance.
