Colorado (CO) Corporate Tax Rate, Economic Nexus, Apportionment & IRC §174 Conformity Guide (2025/2026)
Colorado corporate tax guide for CFOs and CPAs: 4.40% Corporate Income Tax, 100% Single Sales apportionment, $500,000 economic nexus threshold, IRC §174 R&D conformity, and §168(k) bonus depreciation rules.
1. How Colorado Apportionment & Economic Nexus Impact ASC 740 Tax Provisions
For multi-state C-Corporations and SaaS companies selling into Colorado (CO), exceeding $500,000 in annual CO-sourced receipts (or maintaining remote W-2 employees inside the state) establishes nexus under Colorado's Corporate Income Tax. Under 100% Single Sales apportionment and Market-Based rules, SaaS subscription revenue is sourced to Colorado based on where the customer receives the benefit of the software.
2. Colorado Federal-to-State Tax Base Modifications (§174 R&D & §168(k) Bonus Depreciation)
- IRC §174 R&D Capitalization Rule in Colorado: Colorado conforms to the federal TCJA mandatory 5-year amortization of domestic research and experimental (R&E) expenditures under IRC §174. No state subtraction modification is permitted.
- IRC §168(k) Bonus Depreciation Rule in Colorado: Colorado conforms to federal IRC §168(k) bonus depreciation rules; no separate state depreciation addback schedule is required.
- Pass-Through Entity Tax (PTET) Election: Colorado offers an elective Pass-Through Entity Tax (PTET) at an effective rate of 4.40% for S-Corporations and Partnerships (1065/1120-S) looking to bypass the $10,000 federal SALT deduction cap.
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