Tax filing · Colorado
Business tax filing in Colorado, prepared by a team of Certified Accountants, CPAs and Enrolled Agents
Federal returns (1120, 1120-S, 1065, Schedule C) and your Colorado state return, prepared from New York and Mumbai for a flat fee quoted upfront, from $99.
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- 447 Broadway, 2nd Floor, New York, NY 10013
- Certified Accountants, CPAs and Enrolled Agents
- Flat fees quoted upfront
- Replies within 8 hours
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What Colorado asks of a business
Colorado has a flat 4.4% personal income tax, a 4.4% corporate income tax and a 2.9% state sales tax (about 7.89% combined with local rates). An LLC in the state faces a periodic report of $25, due 5 month window surrounding anniversary month. The table below is what we check first on every Colorado engagement.
| Colorado at a glance | What applies | Notes |
|---|---|---|
| Personal income tax | A flat 4.4% personal income tax | Flat rate on taxable income (2025 table) |
| Corporate income tax | A 4.4% corporate income tax | Flat corporate rate (2026 table) |
| Sales tax | A 2.9% state sales tax (about 7.89% combined with local rates) | Combined figure is the population-weighted average with local rates (2026 table) |
| LLC fees | Formation $50; A periodic report of $25, due 5 month window surrounding anniversary month | $25 |
| Corporation fees | Formation $50; Periodic report $10, due Anniversary month | |
| S-corp election | Federal election recognised | Federal S election recognised; a pass-through entity (PTE) tax election may be available, confirmed at engagement |
Figures checked 2026-09 against Colorado Department of Revenue and Colorado Secretary of State. Rates and fees change; we confirm the current numbers for your entity before we quote.
What we prepare for Colorado businesses
- Form 1120 (C-corporation) and Form 1120-S (S-corporation)
- Form 1065 with Schedule K-1s (partnerships and multi-member LLCs)
- Schedule C with Form 1040 (sole proprietors and single-member LLCs)
- Colorado state income tax return, filed with the federal return
- Form 5472 with pro forma 1120 for foreign-owned single-member LLCs
- Sales tax registration and returns where Colorado nexus exists
- 1099-NEC filings and extension requests
- Late and unfiled years, with penalty-relief requests where reasonable cause exists
Things Colorado owners get wrong
Colorado keeps things flat: one rate for personal and corporate income, a periodic report for every entity due in the anniversary month, and a low fee. Remote sellers should note the state-administered local sales taxes, which are a common source of nexus errors.
The federal return is only half the job. Colorado's a flat 4.4% personal income tax reaches pass-through owners through their personal return, and the entity itself faces a periodic report of $25, due 5 month window surrounding anniversary month. Federal S election recognised; a pass-through entity (PTE) tax election may be available, confirmed at engagement.
Nobody sets out to miss these. They are missed because a seasonal preparer handles the federal return in April and nobody owns the state calendar for the rest of the year. We keep the calendar.
Who we file for in Colorado
- Colorado LLCs and S-corps owned by residents
- Foreign-owned Colorado LLCs (Form 5472 filers)
- E-commerce sellers with Colorado inventory or customers
- Agencies, consultants and professional practices
- Businesses behind by a year or more
- CPA firms that need white-label preparation capacity
How it works
- Free 30-minute call, or the form on this page.
- Fixed quote in writing, by entity and complexity.
- Secure document upload.
- Draft return for your approval.
- Filed, with confirmation and copies.
Pricing in Colorado
Business returns from $99, quoted by entity and complexity before any work starts. Colorado state or entity filings are quoted with the federal return, so there is one number, not a list of add-ons. Late years are priced per year. Catch-up bookkeeping, where needed, is a fixed project quoted after a free review.
We do not write "guaranteed", "maximum refund" or "IRS-approved" anywhere, because no honest preparer can. We prepare returns correctly and keep the confirmations.
Colorado questions people ask first
Do I need to file a Colorado state return for my LLC?
Usually yes. Colorado has a flat 4.4% personal income tax, so LLC and S-corp income flows to the owner's Colorado return, and the entity may have its own filing. We prepare both with the federal return.
When is my Colorado business return due?
Federal 1120-S and 1065 returns are due March 16, 2026 (September 15 on extension); 1120 and Schedule C returns April 15 (October 15 on extension). Colorado entity filings run on their own calendar: a periodic report of $25, due 5 month window surrounding anniversary month. We track both.
I own a Colorado LLC but live outside the US. What do I file?
A foreign-owned single-member LLC files Form 5472 attached to a pro forma Form 1120, which cannot be e-filed and carries a $25,000 penalty if missed. We prepare it, fax-file it and keep the transmission report. Multi-member LLCs file Form 1065 with K-1s.
Does Colorado recognise my federal S-corp election?
Yes. Federal S election recognised; a pass-through entity (PTE) tax election may be available, confirmed at engagement
What if I am behind by a year or more?
We prepare each open year, rebuild the books if needed, and include a written reasonable-cause request for penalty relief where one applies. Penalty relief is the IRS's decision; we prepare the request and do not promise the outcome.
Who prepares and signs my return?
A team of Certified Accountants, CPAs and Enrolled Agents working from New York and Mumbai. A US-credentialed preparer reviews and signs. Replies within 8 hours, one point of contact.
Ready for a fixed quote in Colorado?
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