Colorado Partnership Tax Deadlines 2026

When is the Partnership tax filing deadline in Colorado for 2026?

The Colorado Partnership tax return is due Mar 16, 2026 for the 2026 tax year. An extension is available until Sep 15, 2026.

Does Colorado require Partnership estimated tax payments?

Estimated payments are not typically required at the entity level for Partnership in Colorado, but confirm with Colorado Department of Revenue.

What form do I file for a Partnership in Colorado?

Partnership entities in Colorado file using Form State partnership return. You can download the form from Colorado Department of Revenue at https://tax.colorado.gov.

Can I get an extension for my Colorado Partnership tax return?

Yes. Colorado allows an extension for Partnership returns until Sep 15, 2026. Note that an extension gives you more time to file, not more time to pay — any tax owed is still due by the original deadline of Mar 16, 2026.

What are the penalties for filing late in Colorado?

Colorado typically charges a failure-to-file penalty (usually 5% of unpaid tax per month, up to 25%) and a failure-to-pay penalty (usually 0.5-1% per month). Interest also accrues on unpaid balances. Filing for an extension by the original deadline avoids the failure-to-file penalty but not the failure-to-pay penalty.

Where can I file Colorado Partnership taxes?

File through Colorado Department of Revenue. Visit https://tax.colorado.gov for e-filing options, downloadable forms, and payment portals.