Missing Social Security numbers (SSN) and Colorado Account numbers (CAN) on forms and/or payments made by check cause processing problems and could delay proper credit for a tax account. This could also result in billing notices sent to taxpayers because our accounting system doesn’t know to which account the tax or payment applies.
Make sure the SSN or CAN is listed on the Memo Line of the check and is on any documentation mailed to the department. This is especially helpful when a check is sent without a form. The department receives thousands of checks a month that do not contain an SSN or CAN. We spend time researching to properly credit the taxpayer. This causes delays in return processing and refunds.
The best way to avoid these problems is to e-file and pay Colorado taxes through Revenue Online.