BUSIform
Filing Addresses for State of Colorado
Federal
Busiform Envelope
Envelope Size
State
Busiform Envelope
Returns with Refunds or No Payment Department of the Treasury
Internal Revenue Service
Fresno, CA 93888-0002
EF10-5
EF69-5
EF912-5
#10½
6 x 9
9 x 12
Colorado Department of Revenue
1375 Sherman Street
Denver, CO 80261-0005
ECO1-B
ECO6-B
ECO9-B
Returns with Balance Due Internal Revenue Service
PO Box 7704
San Francisco, CA 94120-7704
EV10-0
EV69-0
EV912-0
#10½
6 x 9
9 x 12
Estimated Payments Internal Revenue Service
PO Box 510000
San Francisco, CA 94151-5100
ES09-0
#9
Colorado Dept. of Revenue
1375 Sherman Street
Denver, CO 80261-0008
ECO9-ES
Corporations, Partnerships, etc Internal Revenue Service
Odgen, UT 84201
EF10-9
EF69-9
EF912-9
#10½
6 x 9
9 x 12

Note: Addresses above reflect latest information we have available, but are subject to change. If you have more up-to-date information, please Thank you.