Hello and thank you for using Just Answer,
Your residency in Ohio did not end until you took the necessary steps to sever your ties with Ohio. This started, not when you left to work abroad, but, when you sold your home.
When you sold your residence in Ohio you started your move from the state
because for Ohio tax purposes you were only away temporarily for work purposes.
From what you have stated I am going to assume that you continued to use an address in Ohio for mailing. "Oh is only listed on my W-2 because my fiancé lives there and he would be able to take care of my bills". If this is the case then the state did not know that, they only know that you filed before as a resident (if you were filing
while living there) and you are still showing a connection to the state (address and W2 says you are Ohio).
When you moved to Idaho your date for change of voting, vehicle registration, and driver's lic are all items that will further your argument with Ohio.
Ohio law provides that you will be considered a full-year nonresident of Ohio only if you meet all five of the following requirements:
1)During the entire taxable year you had at least one abode outside of Ohio,
2)You spent no more than 182 contact periods in Ohio during the taxable year,
3)You were not a part-year resident of Ohio during the taxable year,
4)By May 31 of the immediately succeeding calendar year you file, as appropriate, either the affidavit or notice of non-Ohio domicile or notice of no Ohio income tax liability
5)These documents do NOT contain any false statements.
The year you sold your house is still the time to look to for being a nonresident of Ohio. In that year you started the process. Ohio does not see a temporary absence as reason for not being a resident.
I hope this information is helpful, if not then you may wish to seek the assistance of a tax attorney in Ohio to argue your case in the state of Ohio.