Stamford CPA Firm for S-Corps & Small Businesses

Looking for a CPA in Stamford? SDO CPA provides virtual tax preparation, bookkeeping, payroll, and fractional CFO services to Stamford 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 Stamford 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 Stamford’s Financial Services, Corporate Headquarters, Technology economy. Whether you’re managing Multi-state tax complexity for business owners who live in Connecticut but serve clients or maintain offices in New York or capitalizing on Stamford hosts 20+ Fortune 500 company headquarters and regional offices, creating a dense professional services 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 Stamford business owners who want proactive guidance — not just annual tax filing.

Key Takeaways: Stamford CPA Services

  • Virtual CPA services — Full tax, bookkeeping, and advisory support without geographic limitations
  • Connecticut tax expertise — CT has 6.99% top individual rate. Pass-through entity tax (PTET) available at 6.99% for SALT cap workaround. No local income taxes. planning and multi-state compliance
  • Industry focus — Specialized experience with Financial Services, Corporate Headquarters, Technology
  • 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 Stamford, CT

Stamford has emerged as Connecticut’s corporate capital, with over 20 Fortune 500 companies maintaining headquarters or major offices in the city, including Charter Communications, Synchrony Financial, and WWE. The Harbor Point development along the waterfront has added 4,000 residential units and 800,000 square feet of commercial space, transforming the South End into a mixed-use district. The city’s financial services corridor along Tresser Boulevard and Atlantic Street houses hedge funds, private equity firms, and wealth management practices managing hundreds of billions in assets. Stamford’s Metro-North station provides 50-minute access to Grand Central Terminal, making it a preferred location for professionals who split time between Connecticut and New York. The tech sector has grown 25% since 2020, with Indeed, Pitney Bowes, and numerous fintech startups establishing operations. SDO CPA helps Stamford business owners navigate CT-NY dual-state tax obligations, implement PTET elections for SALT cap relief, and structure S-Corps with proper reasonable compensation for financial services professionals.

Connecticut Tax Planning Tip

Connecticut’s PTET allows S-Corps and partnerships to pay entity-level tax, generating a federal deduction to bypass the SALT cap. Combined with CT’s lack of local income taxes, proper entity structuring can significantly reduce overall tax burden for business owners.

Stamford is home to 9,400+ small businesses and a population of 135,470. From Financial Services, Corporate Headquarters, Technology to professional services, Stamford business owners need CPAs who understand Multi-state tax complexity for business owners who live in Connecticut but serve clients or maintain offices in New York and can provide year-round tax planning — not just compliance.

CPA Services for Stamford Businesses

Common Challenges for Stamford Business Owners

Challenge

Stamford businesses often face Multi-state tax complexity for business owners who live in Connecticut but serve clients or maintain offices in New York, 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 Stamford’s business environment, helping you handle Multi-state tax complexity for business owners who live in Connecticut but serve clients or maintain offices in New York with confidence.

Challenge

Many Stamford 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 Stamford 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.

“I was paying taxes in both Connecticut and New York without proper credits. SDO CPA untangled my dual-state situation and saved me $34,600 through PTET elections and proper allocation between states.”
— Jason M., Hedge fund operations manager in Stamford

How to Get Started With SDO CPA

1

Schedule Your Free Consultation

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

Connecticut Tax Expertise

We understand CT has 6.99% top individual rate. Pass-through entity tax (PTET) available at 6.99% for SALT cap workaround. No local income taxes. and help Stamford 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 Stamford 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 Stamford?
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 Stamford business?
Yes. CPAs can prepare tax returns and provide accounting services for clients in any state. SDO CPA serves Stamford 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 Financial Services businesses?
Yes. Stamford’s Financial Services sector has unique accounting needs including industry-specific deductions, revenue recognition, and compliance requirements 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 Stamford businesses?
Yes. Our fractional CFO services provide cash flow forecasting, budgeting, financial modeling, and strategic planning for Stamford businesses generating $500K+ in revenue that need financial leadership without a full-time hire.
Should my Stamford 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 Stamford business during your free consultation. Learn about our bookkeeping services.

Resources for Stamford Business Owners

Also Serving Fairfield County

SDO CPA provides virtual CPA services to businesses throughout Fairfield County and Connecticut.

Ready to Work With a CPA Who Understands Stamford Businesses?

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

Schedule a Call
Licensing Disclaimer: SDO CPA LLC is a Texas-registered CPA firm providing tax preparation, bookkeeping, and advisory services to clients nationwide under CPA practice mobility provisions. SDO CPA does not hold a CPA license in Connecticut. Services requiring CPA licensure are performed by Texas-licensed CPAs. We do not provide attest services (audits, reviews, or compilations) for Connecticut entities. Per Texas State Board of Public Accountancy regulations (22 TAC §501.82).