yeah...that's just a fouled up display page that doesn't show the CO refund/balance due. (for some strange reason)
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IF you mail the Fed, you have to mail CO too...and when you print them out to take down to the Post Office, you'll see on the actual CO tax forms what your CO Refund/Balance due is supposed to be.
Don' forget to sign/date..attach any W-2 forms or any others that show any tax withholding on them...and make sure you put the IRS and CO forms in separate envelopes with different addresses (It's surprising how many people dump them in one envelope and send it all just to the IRS).