State tax laws vary in regard to working from home. We could help better if you tell us what states are involved.
I live in Missouri, but I used to drive to Kansas to go into the office. But since we were sent to work from home, I thought I saw something that you could file, that changed that for the year.
@TomD8 ? Missouri and Kansas?
Since you live in Missouri, ALL your income is taxable by MO - regardless of where you earned it.
The income you earned on the days you physically worked in KS is also taxable by KS.
So you must file a non-resident KS tax return in addition to your resident state MO tax return.
You can claim a credit on your MO tax return for the taxes you pay to KS on the income that is taxed by both states.