Yes, but you’re only required to file separate from the combined federal/state program for 1099s reporting backup withholding. For backup withholding reported on 1099s, you also need to file a state form MW-3.
Yes, Montana 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 Revenue, they should already have a copy.
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