During 2020, I worked remotely temporarily in another state (which has income tax) during the past year as my company was WFH. The remote work I did was for about a month, after which I returned to my resident state. My W2 only has withholding for my resident state (for which I am still a full time resident).
I understand that my time worked in the other state means that I have income earned in that state. Is the correct process for me to manually allocate my wages to the nonresident state based on the number of days I worked there and file as a non-resident to pay the taxes I owe? Since my W2 only shows my resident state, would I run into any issues here?
I don't believe my employer will issue a corrected W2, or if that is necessary but wanted to understand if I needed to take any other steps. My employer can provide a statement on company letter head stating that I did work remote in another state during that time, but I don't believe this can be attached in an e-file anyway and I am not even sure if it is required.
