Warren CPA Firm for S-Corps & Small Businesses

Looking for a CPA in Warren? SDO CPA provides virtual tax preparation, bookkeeping, payroll, and fractional CFO services to Warren businesses specializing in S-Corps and partnerships. We provide upfront estimates — if scope changes, we discuss it first. Schedule a free consultation.
Serena Do, CPA — Managing Partner of SDO CPA

Serena Do, CPA

Managing Partner | Duncanville, TX (Serving Warren Virtually)

18+ Years Experience | AICPA Member

Licensed CPA — Texas State Board of Public Accountancy

With 18+ years of experience helping business owners across the country, I bring specialized expertise to Warren’s Automotive, Defense, Manufacturing economy. Whether you’re managing R&D credits for automotive innovation alongside Michigan’s flat 4.25% income tax or capitalizing on Warren’s position as the epicenter of GM’s global R&D operations, SDO CPA provides the virtual accounting support your business needs.

We offer cloud-based tax preparation, bookkeeping, payroll, and fractional CFO services designed for Warren business owners who want proactive guidance — not just annual tax filing.

Key Takeaways: Warren CPA Services

  • Virtual CPA services — Full tax, bookkeeping, and advisory support without geographic limitations
  • Michigan tax expertise — Michigan has a flat 4.25% income tax with R&D credits and flow-through entity tax election planning
  • Industry focus — Specialized experience with Automotive, Defense, Manufacturing
  • Transparent pricing — Upfront estimates starting at $300/month; if scope changes, we discuss it first
  • Responsive support — Direct CPA access, same-day responses

Accounting & Tax Services in Warren, MI

Warren is the epicenter of automotive R&D in America. The GM Technical Center, General Motors’ global research and development headquarters, employs over 19,000 people on a sprawling campus that drives vehicle design, engineering, and testing for the world’s largest automaker. Adjacent to the Tech Center, a dense network of Tier 1 and Tier 2 automotive suppliers, including operations from Stellantis, Faurecia, and Continental, form one of the most concentrated supplier ecosystems in North America.

The U.S. Army TACOM (Tank-automotive and Armaments Command) further anchors Warren’s economy with a significant defense presence, creating demand for defense contractors and precision manufacturers who must navigate government contract accounting and FAR compliance. Michigan’s flat 4.25% income tax applies to all pass-through entity income, and the state’s flow-through entity tax election provides a mechanism to bypass the federal SALT cap for S-Corp owners with substantial Michigan-source income.

SDO CPA works with Warren business owners in automotive supply, defense contracting, and precision manufacturing to structure entities, claim R&D credits for product development and process improvements, and manage OEM payment cycle cash flow. Whether you’re a Tier 1 supplier serving the GM Tech Center or a defense subcontractor working with TACOM, we provide monthly bookkeeping and fractional CFO services scaled to your growth stage.

Michigan Tax Planning Tip

Michigan’s flat 4.25% income tax applies to all pass-through entity income. Warren automotive suppliers should evaluate Michigan’s flow-through entity tax election to bypass the federal SALT cap, potentially saving $3,000-$12,000 for S-Corp owners with $200K+ in Michigan-source income. Businesses claiming R&D credits for automotive product development should maintain detailed documentation of qualifying activities including tooling design and process engineering.

Warren is home to 8,500+ small businesses and a population of 139,387. From Automotive, Defense, Manufacturing to professional services, Warren business owners need CPAs who understand automotive supplier cost accounting and defense contract compliance and can provide year-round tax planning — not just compliance.

CPA Services for Warren Businesses

Common Challenges for Warren Business Owners

Challenge

Warren automotive suppliers face OEM cost transparency requirements, long payment cycles, and complex R&D credit documentation for product and process development activities.

Our Approach

We provide proactive tax planning tailored to the automotive supply chain, helping you claim R&D credits, manage cash flow through OEM payment cycles, and maintain compliant cost accounting systems.

Challenge

Many Warren business owners struggle to get timely responses from their CPA, especially during busy seasons when questions are most urgent.

Our Approach

SDO CPA provides direct access to your CPA team with same-day response times. No call centers, no waiting weeks for answers.

Challenge

Tax preparation alone doesn’t help Warren business owners understand their financial position or make informed decisions throughout the year.

Our Approach

We deliver monthly financial reports with actionable insights, helping you understand cash flow, profitability, and tax liability before year-end.

“SDO CPA helped our Warren Tier 2 automotive supplier claim $18,000 in R&D credits for tooling design and process engineering work we didn’t know qualified.”
— Anthony R., Automotive supplier owner in Warren

How to Get Started With SDO CPA

1

Schedule Your Free Consultation

Book a call to discuss your Warren business, current financial setup, and goals.

2

Get Your Custom Proposal

Receive a clear proposal with upfront estimates — if scope changes, we discuss it first.

3

Seamless Onboarding

We connect to your QuickBooks or Xero and organize your books within 30 days.

4

Ongoing Partnership

Monthly reports, proactive tax planning, and year-round CPA access.

Why Warren Business Owners Choose SDO CPA

Michigan Tax Expertise

We understand Michigan has a flat 4.25% income tax and help Warren businesses maximize R&D credits and flow-through entity elections while managing federal obligations and multi-state complexity.

Transparent Pricing

Clear monthly estimates for standard services. We scope your needs upfront and communicate before any additional work. See our pricing.

Cloud-Based & Virtual

Access your financials anywhere. We work with QuickBooks Online, Xero, Gusto, and Ramp to keep your Warren business running smoothly.

S-Corp & Partnership Specialists

Our clients are pass-through entity owners. We handle reasonable compensation analysis, K-1 preparation, QBI optimization, and entity selection.

Responsive Communication

Get answers when you need them. Our team responds within one business day, and you’ll have direct access to your CPA.

Frequently Asked Questions

How much does a CPA cost for a small business in Warren?
At SDO CPA, bookkeeping starts at $300-$500 per month for a single entity. Full-service packages including bookkeeping, tax planning, and advisory range from $1,000-$2,000 per month with upfront estimates — if scope changes, we discuss it first. View our pricing.
Can a virtual CPA serve my Warren business?
Yes. CPAs can prepare tax returns and provide accounting services for clients in any state. SDO CPA serves Warren businesses through secure cloud-based tools including QuickBooks Online, Gusto, and encrypted document sharing with the same quality as a local firm.
Do you specialize in Automotive supplier businesses?
Yes. Warren’s automotive supplier ecosystem has unique accounting needs including OEM cost transparency requirements, tooling amortization, R&D credits for product development, and managing cash flow through extended OEM payment terms.
What is the difference between a bookkeeper and a CPA?
A bookkeeper records transactions and maintains financial records. A CPA is a state-licensed professional who can prepare and sign tax returns, provide tax planning advice, represent you before the IRS, and offer strategic financial guidance that bookkeepers cannot.
Do you offer fractional CFO services for Warren businesses?
Yes. Our fractional CFO services provide cash flow forecasting, budgeting, financial modeling, and strategic planning for Warren businesses generating $500K+ in revenue that need financial leadership without a full-time hire.
Should my Warren business be an S-Corp or LLC?
It depends on your net income. Generally, businesses earning over $60,000 in net profit may save on self-employment taxes by electing S-Corp status. Use our S-Corp tax calculator to estimate savings, then schedule a consultation for personalized analysis.
How quickly does SDO CPA respond to questions?
We respond to all client inquiries within one business day. For urgent tax matters, we prioritize same-day responses. You’ll have direct access to your CPA — no call centers or gatekeepers.
What accounting software do you work with?
We work with QuickBooks Online, Xero, Gusto for payroll, and Ramp for expense management. We’ll recommend the best setup for your Warren business during your free consultation. Learn about our bookkeeping services.

Resources for Warren Business Owners

Also Serving Metro Detroit

SDO CPA provides virtual CPA services to businesses throughout Metro Detroit and Michigan.

Ready to Work With a CPA Who Understands Warren Businesses?

Schedule your free consultation today. We’ll analyze your tax situation and provide an upfront estimate with no obligation.

Schedule a Call
Licensing & Service Disclaimer: SDO CPA LLC is a Texas-licensed CPA firm serving clients in Michigan under CPA practice mobility provisions. We do not maintain a physical office in Michigan — all services are delivered remotely via secure video, phone, and digital collaboration tools. SDO CPA does not hold a CPA license in Michigan. Services requiring CPA licensure are performed by Texas-licensed CPAs. We do not provide attest services (audits, reviews, or compilations). Per Texas State Board of Public Accountancy regulations (22 TAC §501.82).