The Complete Denver Business Accounting Guide: Every Service You Need in 2026
Denver's ultimate 2026 accounting guide covering tax planning, bookkeeping, payroll, entity structuring, sales tax, and industry-specific services for contractors, restaurants, healthcare, real estate, e-commerce, and more.
Centennial Accounting GroupFebruary 19, 2026
Tags: Denver CPA, Colorado tax planning, small business accounting, bookkeeping services, payroll compliance, S-Corp election, sales tax Colorado, contractors accounting, restaurant bookkeeping, healthcare accounting, real estate tax, e-commerce sales tax
TL;DR — What This Guide Covers
Whether you run a food truck on South Broadway, flip houses in Aurora, or sell products online from your Denver home office, this guide breaks down every accounting service your business needs in 2026 — with Colorado-specific deadlines, compliance traps, and dollar-saving strategies. Bookmark it. Share it with your business partner. Come back to it at every quarter-end.
1. Tax Planning & Preparation
Colorado's flat 4.40% state income tax rate (effective 2024+) makes strategic planning essential — not optional. Every dollar you shift through legitimate deductions, credits, and entity elections directly impacts your bottom line.
Quarterly estimated taxes — We calculate your safe-harbor amounts so you never face underpayment penalties (which hit 8% in 2025 and remain elevated)
One Big Beautiful Bill (OBBA) planning — The 2025 federal tax overhaul extended bonus depreciation at 100% through 2029, expanded the QBI deduction for service businesses, and created new clean-energy credits. We model the impact on your specific situation.
Colorado Enterprise Zone credits — If you operate in a designated zone (parts of Aurora, Commerce City, Pueblo, rural counties), you could earn 3% tax credits on new hires and equipment
R&D Tax Credits — Software companies, manufacturers, and even breweries with custom processes may qualify for federal and Colorado R&D credits worth 6.5–20% of qualifying expenses
📅 Key 2026 Colorado Deadlines: April 15 (individual + C-Corp), March 17 (S-Corp + Partnership), quarterly estimates due April 15, June 16, September 15, January 15.
Colorado payroll is uniquely complicated. Between the FAMLI program (0.9% of wages), Denver's Occupational Privilege Tax ($5.75/month employee + $4/month employer), and Colorado's strict pay-transparency and pay-frequency laws, getting payroll wrong is expensive.
Common Payroll Mistakes We Prevent
Misclassifying 1099 contractors — Colorado's ABC test is strict. If you control how the work is done, they're probably a W-2 employee. Penalties: back taxes + 10–25% IRS fines.
Missing FAMLI contributions — Mandatory since 2024. Both employer and employee portions must be reported quarterly.
Ignoring Denver OPT — Every employee working in the City & County of Denver owes $5.75/month. You must withhold and remit it — no exceptions.
Late W-2 / 1099 filings — The January 31 deadline is firm. Late penalties start at $60/form and scale to $310/form.
Skipping workers' comp — Colorado requires coverage for all W-2 employees. No exemption for small businesses.
Choosing the wrong entity costs Denver business owners $5,000–
5,000+ per year in unnecessary taxes. Here's the real breakdown:
Entity
Best For
Colorado Filing Fee
Self-Employment Tax?
Sole Proprietor
Side hustles <$30K
$0
Yes — 15.3%
Single-Member LLC
Liability protection, simple
$50
Yes — 15.3%
S-Corp (LLC + election)
Net income >$50K
$50 + IRS Form 2553
Only on salary
C-Corp
Seeking investors, IPO track
$50
No (but double-taxed)
Partnership (LP/LLP)
Multi-owner ventures
$50
Varies by partner type
The S-Corp sweet spot: If your business nets $60K+, an S-Corp election lets you split income between a reasonable salary (subject to FICA) and distributions (not subject to FICA), saving $6,000–
2,000/year in self-employment taxes.
Colorado has the most complex sales tax system in the United States — and that's not opinion, it's consensus. With 70+ home-rule cities, each with their own rates, rules, and filing portals, compliance is a full-time job.
What You Need to Know
State rate: 2.9% (one of the lowest — but that's misleading because local rates stack)
Denver combined rate: 8.81% (state + RTD + city + stadium + cultural + other)
Home-rule cities (Denver, Aurora, Colorado Springs, Boulder, etc.) require separate registrations and separate filings
Economic nexus threshold:
00K in sales into Colorado triggers collection obligations even with no physical presence
Marketplace facilitator law: Amazon, Etsy, Shopify collect state tax automatically — but NOT home-rule city taxes
Job costing, WIP reporting, contractor vs. employee classification, Colorado contractor license compliance, prevailing wage tracking for government contracts, and construction-specific sales tax exemptions (materials incorporated into real property).
🍽️ Restaurants & Hospitality
Tip reporting and FICA tip credits, food vs. beverage tax distinctions, Denver's restaurant tax overlay, inventory cost management (FIFO vs. weighted average), and POS integration with QuickBooks.
🏥 Healthcare & Medical Practices
HIPAA-compliant financial processes, provider compensation structuring, practice valuation for buy-ins/buy-outs, medical equipment depreciation (Section 179 + bonus), and Colorado healthcare-specific licensing fees.
🏠 Real Estate & Property Management
Rental income reporting (Schedule E), 1031 exchange structuring, cost segregation studies for accelerated depreciation, property management trust accounting, and Colorado-specific RETA (Real Estate Transfer Assessment).
🛒 E-Commerce & Online Sellers
Multi-state nexus analysis, marketplace facilitator reconciliation, inventory valuation for COGS, home office deductions for Denver-based sellers, and international VAT considerations.
🚛 Transportation & Trucking
Per diem deductions, IFTA fuel tax reporting, equipment depreciation schedules, owner-operator vs. company driver classification, and DOT compliance recordkeeping.
✅ Confirm your entity election is still optimal (especially if income changed significantly)
✅ Verify Colorado sales tax registrations for every home-rule city where you have nexus
✅ Set up quarterly estimated tax payments with safe-harbor amounts calculated
✅ Review worker classifications — 1099 vs. W-2 — before the IRS does
✅ Reconcile all bank and credit card accounts through January 2026
✅ File FAMLI quarterly reports on time
✅ Claim all OBBA provisions: 100% bonus depreciation, expanded QBI, energy credits
✅ Document home office measurements and expenses if claiming the deduction
✅ Review retirement plan contributions (SEP-IRA deadline is April 15 with extension)
✅ Schedule a mid-year tax projection with your CPA by June
Top 7 Accounting Mistakes Denver Businesses Make
Mixing personal and business finances — Pierces LLC protection and makes audits 10x harder
Ignoring Denver's home-rule sales tax — The city audits aggressively and assesses penalties + interest retroactively
Waiting until April to do tax planning — Tax planning is a year-round activity. By April, your options are limited to IRA contributions and that's about it.
DIY payroll without understanding FAMLI + OPT — Colorado-specific obligations catch out-of-state platforms off guard
Not tracking mileage in real time — The 2026 IRS rate is $0.70/mile. At 15,000 business miles, that's a
0,500 deduction you're leaving on the table.
Skipping estimated quarterly payments — The underpayment penalty is essentially a forced loan to the government at 8% interest
Filing as a sole proprietor when S-Corp saves money — If you net over $50K, you're likely overpaying FICA by thousands
Frequently Asked Questions
How much does a Denver CPA cost for a small business?
Monthly bookkeeping starts at $300–$500/month for simple businesses. Tax preparation ranges from $500 (simple 1040 + Schedule C) to $2,500+ (S-Corp with multiple states). At CAG, we provide transparent fixed-fee pricing — no hourly billing surprises.
Do I really need a CPA, or can I use TurboTax?
If your business has employees, operates in multiple Colorado cities, earns over $75K, or has any entity complexity, a CPA typically saves 3–5x their fee through deductions, credits, and penalty avoidance that software misses.
When should I switch from sole proprietor to S-Corp?
The general rule: when your net self-employment income consistently exceeds $50,000–$60,000. The S-Corp election eliminates FICA tax on the distribution portion, but adds payroll costs (~$500–
,000/year). We run a break-even analysis for every client considering this switch.
What records do I need to keep and for how long?
The IRS generally requires 3 years of records, but Colorado requires 4 years for state tax purposes. Employment records must be kept 4–7 years. We recommend keeping all records for 7 years as a safe standard.
How does Colorado's FAMLI program affect my business?
As of 2024, all Colorado employers must participate in FAMLI (Family and Medical Leave Insurance). The premium is 0.9% of wages, split 50/50 between employer and employee for businesses with 10+ employees. Smaller businesses only withhold the employee portion. Quarterly reporting is mandatory.
Can you help with IRS audits or back taxes?
Yes. We provide full IRS and Colorado Department of Revenue audit representation, back-tax filing (we regularly reconstruct 3–5 years of unfiled returns), installment agreement negotiation, and penalty abatement requests.
Ready to Stop Guessing and Start Saving?
Every week you operate without a strategic accounting partner is a week you're likely overpaying in taxes, missing compliance deadlines, or making decisions without clear financial data.
Book a free 30-minute consultation with Centennial Accounting Group. We'll review your current situation, identify immediate savings opportunities, and build a custom plan for your industry and growth stage.
Tax Disclaimer: This article is for informational purposes only and does not constitute tax, legal, or financial advice. Tax laws and regulations change frequently. The information provided reflects our understanding as of February 2026. Consult with a qualified tax professional at Centennial Accounting Group before making any tax or business decisions based on this content. Individual results vary based on specific circumstances.
Sources & References
This article references information from the following authoritative sources:
Disclaimer: This article is provided for informational and educational purposes only and does not constitute legal, tax, or financial advice. Tax laws and regulations change frequently, and the information presented may not reflect the most current legal developments. Every individual's tax situation is unique, and the strategies discussed may not be suitable for your specific circumstances.
Before making any tax-related decisions, we strongly recommend consulting with a qualified tax professional or accountant. CAG Accountant is not responsible for any actions taken based on the information in this article. All referenced trademarks and copyrights belong to their respective owners.