My tab expires in September (not sure of due day) 2021. My job is relocating to another State in October, 2021. Can I receive an extension or should I be prepared to pay tabs in both places?

Renew your tags so you don't get a ticket go ahead and relocate when the tags are about to expire again get the new tags where are you relocated to only get the one-year tags and Kansas City though don't get the two years at the end of that one-year renewal at your relocation home

You should be able to get 2 year extension in KC but if you're still living in the other state after the 2 years, you will have to switch over to that state.