The Department of Revenue is processing 2023 income tax returns. For more information, please read the Department's announcement.


Sales Tax Non-Filer Notices


If you received a notice from the Department about not filing your sales tax return, you have a few options:

  1. File any missing sales tax returns, even if the amount due is zero. You can save time by filing online with Revenue Online.
  2. If your business ceased operations, close your sales tax account. This can be done online with Revenue Online or file a Business Closure Form (DR 1102). Dissolving your organization with the Secretary of State's Office will not automatically close your sales tax account.
  3. If you did file the return more than 15 days prior to the date on the notice, send us copies of the return, the canceled payment check (if applicable), and/or the EFT confirmation.

Action needs to be taken within 5 days of the date on the letter. If no action is taken, the Department will estimate the sales tax owed and send a Notice of Deficiency for that amount, plus applicable penalties and interest. If you have questions, please call the Taxpayer Helpline at (303) 238-7378. Representatives are available Monday through Friday, 8:00 a.m. to 4:30 p.m. (except on state holidays).


If you have already filed the return(s) for this period, log into your Revenue Online account to check the status of your return.

  • If the Revenue Online records show that your return has NOT been received by the CDOR, please send copies of the return(s) and any canceled check(s) and/or EFT confirmation(s) to the Department or by filing a protest and uploading attachments on Revenue Online
  • If the Revenue Online records show that your return HAS been received by the CDOR, please disregard this notification.