Fairfax CPA Firm for S-Corps & Small Businesses

Looking for a CPA in Fairfax? SDO CPA provides virtual tax preparation, bookkeeping, payroll, and fractional CFO services to Fairfax 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 Fairfax 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 Fairfax’s Technology, Government Services, Education economy. Whether you’re managing Small IT firms managing rapid scaling and contractor-to-employee conversion as they win larger government contracts or capitalizing on George Mason University’s 40,000+ students and Innovation District create a talent pipeline for Northern Virginia’s $60 billion technology sector, SDO CPA provides the virtual accounting support your business needs.

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

Key Takeaways: Fairfax CPA Services

  • Virtual CPA services — Full tax, bookkeeping, and advisory support without geographic limitations
  • Virginia tax expertise — 2-5.75% income tax. Pass-through entity tax (PTET) available. Conformity to federal tax changes with some modifications. planning and multi-state compliance
  • Industry focus — Specialized experience with Technology, Government Services, Education
  • 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 Fairfax, VA

Fairfax City serves as the independent seat of Fairfax County government and sits at the crossroads of Northern Virginia’s technology and government contracting corridors. George Mason University’s main campus, with 40,000+ students and a growing innovation district, supplies talent to the region’s IT, cybersecurity, and data analytics firms. The Fairfax City center along Main Street and University Drive has attracted restaurants, retail shops, and professional services firms serving both the university community and county government employees. The surrounding Fairfax County represents the largest jurisdiction in Virginia by population with 1.14 million residents and serves as headquarters for numerous technology firms along the I-66 corridor. Government IT services firms cluster near the Fairfax County Government Center, competing for contracts at the federal, state, and county levels. SDO CPA works with Fairfax technology entrepreneurs and government contractors on rapid-growth entity structuring, PTET elections, contractor-to-employee payroll transitions, and R&D tax credits for software development firms.

Virginia Tax Planning Tip

Virginia’s income tax tops out at 5.75% on income over $17,000. S-Corp and partnership owners should evaluate the pass-through entity tax (PTET) election, which lets the entity pay state tax and deduct it at the federal level, effectively bypassing the $10,000 SALT cap. Virginia generally conforms to federal tax law but decouples on certain provisions, so check conformity dates before claiming federal deductions on your state return.

Fairfax is home to 3,200+ small businesses and a population of 26,340. From Technology, Government Services, Education to professional services, Fairfax business owners need CPAs who understand Small IT firms managing rapid scaling and contractor-to-employee conversion as they win larger government contracts and can provide year-round tax planning — not just compliance.

CPA Services for Fairfax Businesses

Common Challenges for Fairfax Business Owners

Challenge

Fairfax businesses often face Small IT firms managing rapid scaling and contractor-to-employee conversion as they win larger government contracts, 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 Fairfax’s business environment, helping you handle Small IT firms managing rapid scaling and contractor-to-employee conversion as they win larger government contracts with confidence.

Challenge

Many Fairfax 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 Fairfax 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 Fairfax IT firm transition from a two-person LLC to a 15-employee S-Corp when we won a GSA contract. They saved us $28,700 in taxes and set up payroll properly from day one.”
— Anil S., IT services company owner in Fairfax

How to Get Started With SDO CPA

1

Schedule Your Free Consultation

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

Virginia Tax Expertise

We understand 2-5.75% income tax. Pass-through entity tax (PTET) available. Conformity to federal tax changes with some modifications. and help Fairfax 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 Fairfax 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 Fairfax?
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 Fairfax business?
Yes. CPAs can prepare tax returns and provide accounting services for clients in any state. SDO CPA serves Fairfax 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 Technology businesses?
Yes. Fairfax’s Technology 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 Fairfax businesses?
Yes. Our fractional CFO services provide cash flow forecasting, budgeting, financial modeling, and strategic planning for Fairfax businesses generating $500K+ in revenue that need financial leadership without a full-time hire.
Should my Fairfax 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 Fairfax business during your free consultation. Learn about our bookkeeping services.

Resources for Fairfax Business Owners

Also Serving Northern Virginia

SDO CPA provides virtual CPA services to businesses throughout Northern Virginia and Virginia.

Ready to Work With a CPA Who Understands Fairfax 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 Virginia. Services requiring CPA licensure are performed by Texas-licensed CPAs. We do not provide attest services (audits, reviews, or compilations) for Virginia entities. Per Texas State Board of Public Accountancy regulations (22 TAC §501.82).