Where to mail your Colorado state tax return
Mailing your Colorado Form 104 (DR 0104) depends on your situation: Return with payment goes to Colorado Department of Revenue, Denver, CO 80261-0006, while Return without payment goes to Colorado Department of Revenue, Denver, CO 80261-0005. Pick the address that matches your return below, sign and date the form, and mail it before the deadline.
Return with payment
Colorado Department of Revenue Denver, CO 80261-0006
Use this address for a paper Form 104 (DR 0104) where return with payment.
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Type your letter in the browser. We print it, stamp it, and hand it to USPS — usually same business day. No printer, no stamps, no post office.
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- Confirmation of Mailing emailed
Other mailing addresses
Return without payment
Colorado Department of Revenue Denver, CO 80261-0005
Use this address for a paper Form 104 (DR 0104) where return without payment.
Your name
Your return address
Colorado Department of RevenueDenver, CO 80261-0006
Your letter, printed and mailed for you.
Key facts
- Colorado splits paper Form 104 (DR 0104) returns by address: return with payment vs. return without payment — mailing to the wrong one can delay processing.
- Make checks or money orders payable to the "Colorado Department of Revenue".
- These two addresses have no street line — like Michigan, Colorado routes them on the dedicated ZIP code alone.
- A mailed return is generally considered filed on time if it is postmarked by the state filing deadline — sign and date it, since an unsigned return isn't considered filed.
- PostPal prints your return and hands it to USPS the next business day for $5 — no printer, envelope, or trip to the post office.
How to send your letter
- 1
Pick the address that matches your situation
Colorado uses a different address depending on whether you're enclosing a payment: Return with payment; Return without payment. Choose the one below that matches your return.
- 2
Assemble and sign your return
Attach any required schedules and withholding statements to your Form 104 (DR 0104). Sign and date it — an unsigned paper return isn't considered filed.
- 3
Address the envelope exactly
Use Colorado Department of Revenue at the address for your situation, shown above. These two addresses have no street line — like Michigan, Colorado routes them on the dedicated ZIP code alone.
- 4
Mail it before the deadline
A USPS postmark by the filing deadline counts as on time. Upload your return to PostPal and we print, envelope, and mail it within one business day for $5, with a dated confirmation emailed to you.
Common questions
Where do I mail my Colorado state tax return?
It depends on whether you're enclosing a payment. For "return with payment," mail it to Colorado Department of Revenue, Denver, CO 80261-0006. For "return without payment," mail it to Colorado Department of Revenue, Denver, CO 80261-0005.
Does it matter which Colorado address I use?
Yes. Colorado Department of Revenue routes paper returns by mail code, so sending a payment return to the no-payment address (or vice versa) can delay processing, even though the state and ZIP still get it to the right building.
What do I make my check payable to?
The "Colorado Department of Revenue". Write your Social Security number and the tax year on the check or money order.
Is a mailed Colorado return considered on time if it's postmarked by the deadline?
Generally yes — most states, including Colorado, treat a return as timely filed if it carries a USPS postmark on or before the filing deadline. Keep proof of mailing for your records; PostPal emails you a dated confirmation.
Can PostPal mail my Colorado tax return for me?
Yes. Upload your completed, signed Form 104 (DR 0104) and PostPal prints it and mails it to Colorado Department of Revenue, Denver, CO 80261-0006 (or your correct address, based on your situation) the next business day for $5, with a dated Confirmation of Mailing.
Sources
Addresses verified September 2026 against official sources. Always confirm on the official site before time-sensitive filings.