Yes, Idaho requires you to file 1099s to the State Tax Commission.
Yes, Idaho does. Learn more about combined state and federal filing. In most cases, if you participated in combined filing for your 1099s, then you do not need to send 1099s to the state’s Department of Taxation, they should already have a copy.
For any 1099s with backup withholding, you’ll need to fill out Form 967 by the last day of February.
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