It's too late for your employer to issue corrected W-2's. The taxes withheld have already been deposited with the State of Idaho. You have to do the calculations yourself.
Remember that amended returns must be printed and mailed. They can't be e-filed. You must do a separate amended return for each year you want to amend. If you amend more than one year, mail each amended return separately. Be sure to include an explanation as to why you're amending. Don't amend your 2019 Idaho return until your original return has been fully processed and you've received your refund (if one was due).
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
