1) The Idaho part-year sounds like it is wrong. Make sure you go thru all of the income allocations in the ID interview, and assign the proper $$ amounts to Idaho. i.e. any income while living there.
Is it possible you are getting a full refund form ID...yeah..if your gross income for the year was low enough. IF line 41 of the Idaho Form 43 ends up as a zero, then you get all your ID withholding back...BUT, you must really print out the Form 43 to make sure all of the entries are correct on the lines above it.
...especially line 39, that line MUST be a % of total yearly income that was received/earned while you were still an ID resident. So if half of the total year's income was earned in ID, then that lien must be 50%
2) When doing part-Year SC, Filing as a resident.....(The ID tax return must be filled in and fully correct first ).
The big IF here is whether ID really is refunding you everything. IF they are, then yes, there is no credit for taxes paid to ID, since ID didn't "keep" anything. IF there is a positive non-zero value on line 53 of the Idaho Form 43, then SC should be allowing that value as a credit for taxes paid to another state.....but as I said, the ID Form 43 must be complete, and fully correct first....before you venture into the SC tax return..
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
