Where Precision Meets Partnership

DMO Accounting helps HVAC companies, plumbers, service businesses, and driven small business owners who want accurate numbers, clear strategy, and a CPA they can count on.

I’m Derek Orendorff, CPA and founder of DMO Accounting in East Peoria, IL. I believe every successful business start with two things: accurate numbers and a dependable partner. I combine precise, cloud-based accounting systems with personal, one-on-one service that puts your business first.

While my systems let me work with clients anywhere, I maintain strong connections in Central Illinois, the Quad Cities, and the Dallas Fort Worth (DFW) area. This approach gives you the efficiency of modern technology along with the trust that comes from real, face to face relationships and a handshake when it matters most.

Here is how I combine modern tools with personal service to give you the best of both worlds:

Cloud-based CPA firm for speed, accuracy, and convenience

Job costing and accounting setup (QuickBooks) for true job profitability
Cash flow planning and seasonal budgeting to stay profitable year-round

KPI dashboards and margin reviews to track what really matters
Startup support with affordable setup and guidance with the goal of building a long-term partnership
Payroll systems that keep crews paid and compliant
Business tax support for S-Corps, partnerships, and sole proprietors

Let’s Begin Your Free Business Check-Up

Email Me Your Questions

CPA for HVAC, Plumbers, and trades serving the Quad Cities, Central Illinois, and DFW

3 Steps to Get Started

Step 1 - Book Your Free Consultation

Tell me about your business and goals. I’ll listen, ask questions, and explain exactly how I can help.

Step 2 - Get a Customized Plan

You’ll receive a clear, tailored proposal that outlines services, timelines, and transparent pricing: designed around what your business actually needs.

Step 3 - Start With Confidence

We’ll get your systems setup, your books organized, and your questions answered so you can focus on growing your business.

Getting started is simple: one conversation is all it takes to put precision, partnership, and first-class accounting on your side.

Let’s Begin Your Free Business Check-Up

Why Choose DMO Accounting

Trade-Focused CPA - We work exclusively with contractors, service businesses, startups, and family-owned businesses who need accurate books, clear reports, and proactive guidance.
Same-Day Responsiveness - Job costing and payroll questions cannot wait. I respond quickly so your jobs keep moving.
On-Time, Every Time - Deliverables completed when promised, because your business runs on trust and timelines.
Proven CPA Expertise - I bring years of professional experience directly to the unique financial challenges that trades and small businesses face every day.
Tailored, Practical Solutions - From job costing and payroll to cash flow management and long-term planning, every solution is designed around your goals and how your business actually works.

Let’s Begin Your Free Business Check-Up

Our Services

Accounting — Your Business Financial Foundation

Strong books are the backbone of every profitable business: whether you run a crew, a storefront, or a growing office. We set up job costing in QuickBooks or Sage, streamline payroll for teams, and deliver reports you can actually use. With clear, accurate numbers, you’ll see which projects make money, where margins are slipping, and how to keep your business moving forward.
Advisory — Strategies That Drive Growth

Running a small business means juggling people, projects, and growth while planning for the future. We help you scale with confidence through KPI dashboards, margin tracking, and cash flow planning. Whether you’re adding your first truck, expanding your storefront, or preparing for succession, we give you the clarity and strategy to make every move count.
Business Tax Support — Compliance Without the Stress

Business owners deserve more than a last-minute tax bill. We provide proactive planning and industry-specific strategies for contractors, trades, service companies, and local small businesses. From S-Corp setups to year-round tax strategy, we help you keep more of what you earn and eliminate costly surprises.