If you are filing an individual income tax return that includes no payment or if you are due a refund, mail your return to:
Montana Department of Revenue
PO Box 6577
Helena, MT 59604-6577
If you are filing an individual income tax return that includes a payment, mail your return and check to:
Montana Department of Revenue
PO Box 6308
Helena, MT 59604-6308
If you are paying an estimated individual income tax payment, mail your voucher and payment to:
Montana Department of Revenue
PO Box 6309
Helena, MT 59604-6309