Montana recently released the 2024 Electronic Filing Specifications for 1099 and W-2. For W-2, Montana conforms to the Social Security Administration’s EFW2 Publication (Specifications for Filing Forms W-2 Electronically). For 1099 forms, Montana conforms to the IRS Publication 1220 Specifications (Specifications for Electronic Filing of Forms 1097, 1098, 1099, 3921, 3922, 5498, and W-2G).
Montana’s W-2 and 1099 guidance can be found here.
