Question 1

What's the most important tax deadline for Colorado LLCs?

Accepted Answer

For most Colorado LLC owners: federal quarterly estimated tax payments (April 15, June 15, Sept 15, Jan 15) + Colorado annual report (See state Secretary of State) + federal tax return (March 15 for partnerships/S-Corps, April 15 for SMLLC). Missing the annual report triggers admin dissolution.

Question 2

When are estimated tax payments due for Colorado LLCs?

Accepted Answer

Federal: quarterly on April 15, June 15, Sept 15, and Jan 15 of the following year. Pay at least 100% of last year's total tax (110% if AGI > $150K) or 90% of current year's liability to avoid underpayment penalties. Colorado state estimated tax varies — check Colorado Department of Revenue for state-specific quarterly dates.

Question 3

What's the Colorado state annual report deadline?

Accepted Answer

See state Secretary of State. Missing this deadline risks administrative dissolution of your LLC — which retroactively removes liability protection. Calendar it immediately after formation.

Question 4

When are federal LLC tax returns due?

Accepted Answer

Single-member LLC (disregarded): April 15 with personal 1040. Multi-member LLC (partnership): Form 1065 due March 15. S-Corp LLC: Form 1120-S due March 15. C-Corp LLC: Form 1120 due April 15. All except SMLLC can extend 6 months (to Sept 15 or Oct 15).

Question 5

What are the penalties for missing deadlines in Colorado?

Accepted Answer

Federal: 5%/month late filing (up to 25% of tax). State: varies — CA franchise fail = $800 + interest; FL late annual = $400; NY annual late = $9 penalty; TX franchise late = $50+. Admin dissolution risk if annual compliance missed 1-3 years.

Question 6

Does Colorado offer tax extensions?

Accepted Answer

Federal: automatic 6-month extension via Form 4868 (individual) or Form 7004 (entity). Colorado state extensions often require separate filing — most states grant 6 months but require a state extension form. Extensions extend filing time, NOT payment time — penalty interest still accrues on unpaid tax.

Colorado LLC Tax Deadlines Calendar

Federal LLC Tax Deadlines

Colorado State-Specific Deadlines

Colorado-Specific Notes

FAQ

What's the most important tax deadline for Colorado LLCs?

When are estimated tax payments due for Colorado LLCs?

What's the Colorado state annual report deadline?

When are federal LLC tax returns due?

What are the penalties for missing deadlines in Colorado?

Does Colorado offer tax extensions?

Estimate your Colorado quarterly taxes

Colorado LLC Tax Deadlines Calendar

Federal LLC Tax Deadlines

Colorado State-Specific Deadlines

Colorado-Specific Notes

FAQ

What's the most important tax deadline for Colorado LLCs?

When are estimated tax payments due for Colorado LLCs?

What's the Colorado state annual report deadline?

When are federal LLC tax returns due?

What are the penalties for missing deadlines in Colorado?

Does Colorado offer tax extensions?

Estimate your Colorado quarterly taxes