Durham CPA Firm for S-Corps & Small Businesses

Looking for a CPA in Durham? SDO CPA provides virtual tax preparation, bookkeeping, payroll, and fractional CFO services to Durham 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 Durham 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 Durham’s Life Sciences, Biotech, Healthcare economy. Whether you’re managing grant accounting and research compliance for Duke-affiliated companies or capitalizing on Research Triangle Park’s 300+ company innovation ecosystem, SDO CPA provides the virtual accounting support your business needs.

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

Key Takeaways: Durham CPA Services

  • Virtual CPA services — Full tax, bookkeeping, and advisory support without geographic limitations
  • North Carolina tax expertise — North Carolina’s 2.5% corporate income tax (lowest in the nation, dropping to 0% by 2030) planning and multi-state compliance
  • Industry focus — Specialized experience with Life Sciences, Biotech, Healthcare
  • 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 Durham, NC

Durham is where research becomes revenue. Home to Duke University, ranked among the top 10 national universities, and the epicenter of Research Triangle Park, Durham has transformed from its tobacco-era roots into a biotech and innovation powerhouse. Duke Health employs 40,000+ people as the largest employer in the Triangle, and over $1.5 billion in NIH research funding flows through Duke annually, fueling a pipeline of life sciences startups and university spinoffs.

Research Triangle Park spans 7,000+ acres with 300+ companies and 55,000+ workers, many operating at the intersection of Durham and Raleigh. The American Tobacco Campus and downtown Durham’s startup scene have attracted digital health companies, software firms, and professional services providers. North Carolina’s 2.5% corporate income tax rate creates planning opportunities for Durham S-Corp and partnership owners, particularly those managing grant-funded research alongside commercial operations that require careful accounting separation.

SDO CPA works with Durham business owners across life sciences, biotech, digital health, and professional services to structure entities, manage grant accounting compliance, and optimize S-Corp reasonable compensation. For startups at the American Tobacco Campus or biotech companies near RTP, we provide monthly bookkeeping, investor-ready financials, and fractional CFO services scaled to your research and commercialization stage.

North Carolina Tax Planning Tip

North Carolina’s corporate income tax is 2.5% in 2026 and is scheduled to reach 0% by 2030. Durham life sciences companies receiving federal research grants should carefully separate grant-funded activities from commercial revenue for proper tax treatment. R&D tax credits can apply to qualifying research expenses beyond what grants cover, and proper documentation of these activities is essential to maximize credits at both the federal and state level.

Durham is home to 25,000+ small businesses and a population of 295,179. From Life Sciences, Biotech, Healthcare to university spinoffs and digital health startups, Durham business owners need CPAs who understand grant accounting and research compliance for Duke-affiliated companies and can provide year-round tax planning — not just compliance.

CPA Services for Durham Businesses

Common Challenges for Durham Business Owners

Challenge

Durham businesses often face grant accounting and research compliance for Duke-affiliated companies, making tax planning and cash flow management more complex than standard approaches allow.

Our Approach

We provide proactive tax planning and fractional CFO services tailored to Durham’s business environment, helping you handle grant accounting, research compliance, and commercialization planning with confidence.

Challenge

Many Durham 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 Durham 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.

“As a Duke spinoff transitioning from grant funding to commercial revenue, we needed a CPA who understood both worlds. SDO CPA structured our accounting to keep grant compliance clean while building investor-ready financials for our Series A.”
— Sarah T., Biotech company founder in Durham

How to Get Started With SDO CPA

1

Schedule Your Free Consultation

Book a call to discuss your Durham 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 Durham Business Owners Choose SDO CPA

North Carolina Tax Expertise

We understand North Carolina’s 2.5% corporate income tax (lowest in the nation, dropping to 0% by 2030) and help Durham businesses maximize tax advantages 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 Durham 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 Durham?
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 Durham business?
Yes. CPAs can prepare tax returns and provide accounting services for clients in any state. SDO CPA serves Durham 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 Life Sciences businesses?
Yes. Durham’s Life Sciences sector has unique accounting needs including grant compliance, clinical trial accounting, R&D tax credit documentation, and technology licensing that we address with tailored solutions.
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 Durham businesses?
Yes. Our fractional CFO services provide cash flow forecasting, budgeting, financial modeling, and strategic planning for Durham businesses generating $500K+ in revenue that need financial leadership without a full-time hire.
Should my Durham 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 Durham business during your free consultation. Learn about our bookkeeping services.

Resources for Durham Business Owners

Also Serving the Research Triangle

SDO CPA provides virtual CPA services to businesses throughout the Research Triangle and North Carolina.

Ready to Work With a CPA Who Understands Durham 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 North Carolina under CPA practice mobility provisions. We do not maintain a physical office in North Carolina — all services are delivered remotely via secure video, phone, and digital collaboration tools. SDO CPA does not hold a CPA license in North Carolina. 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).