Established in 2008. Proudly serving our community for 10 Years.

About Us


Your Success is Our Success

Growing your business and serving your customers each day, month and year are your strengths. Ours are managing, processing and keeping track of all facets of accounting. 

Providing services for companies of all sizes (from small to medium to large) and individuals, our trusted experts and Certified Public Accountant are available to help you with your accounting and tax related needs. 


Accounting, Simplified

At BAS Accounting Services our consultants and Certified Public Accountant strive to enhance your bottom line through cost effective management and accounting of operating costs and reporting for employee expenses, management costs, payroll, taxes, as well as costs associated with overhead including benefits, equipment and software.

Serving as an expert and adviser in matters of accounting, auditing, reviews, attestation, and taxes,  our skilled staff assist businesses, governmental entities, not-for-profit organizations, and individuals to more easily and  effectively manage their domestic and international accounting and tax needs. 


Efficient and Productive

Serving businesses, governmental entities, not-for-profit organizations, and individual clients, we work hard and long hours when they need us - even after tax season. 

Our consistent track record of uncompromising ethics instills confidence and trust. We use cutting edge technologies to stay  abreast of trends and changes in the financial world. This allows us to  respond quickly, and to better assist you with achieving financial goals for you or your business.

Knowledge and Leadership


Industry Knowledge

 BAS Accounting Services leverages  extensive industry knowledge and  experience to provide proactive advice and support to clients on key  accounting issues including audits and reviews, tax planning and  preparation, bookkeeping, financial reporting, employee stock  compensation, complex equity transactions, revenue recognition,  financial statement presentation, capitalization and SEC requirements. 



 BAS Accounting Services' tax and  audit operations are led by  Karen Crosswhite (CPA License #47387). With nearly 20 years of  tax, accounting and business advisory experience her combined  technical expertise in public accounting and experience with  international corporations, small to medium sized businesses and  not-for-profit organizations underlies the firm’s ability to develop  accounting and tax solutions and strategies for clients ranging from  start-up organizations to large publicly held corporations. 


Big 4 Experience

Prior to BAS Accounting Services, Karen worked in senior roles with three of  the four leading US accounting firms: Ernst & Young, Deloitte and  PricewaterhouseCoopers (PwC). Working with these firms, Karen led senior  level accounting, audit and international tax practice engagements for  clients including Marriott Corporation, Watson Wyatt, Rosetta Stone, PRA  Health Sciences, Linear Tech, Nextel International, eBay, E-Trade, MARS  Corporation, Airbus and Fannie Mae. 

Community Engagement & Recognition


  • BAS Accounting Services, CPA Firm Awarded Chamber Excellence Award by the Greater Reston Chamber of Commerce | June 27, 2019 (Learn More)
  • BAS Accounting Services, Certified Public Accountant Firm nominated for ACE Awards for Chamber Excellence by the Greater Reston Chamber of Commerce. (Learn More)
  • Recipient of Shrivastava GovCon Scholarship at GMU | December 2018 (Learn More)

Speaking Engagements


  •  New Tax Deductions Under Section 199A  | October 30, 2019: Real Estate and Construction Conference, Greater Washington Society of CPAs, Washington, DC.  Attendees earn one CPE Credit.
  • International Tax and Global Profit Shifting  | June 19, 2019: Republic of Work , Cork Ireland. 
  • Small Business Strategies Under the Tax Cuts and Jobs Act (TCJA)  | May 6, 2019: Loudoun Small Business Conference, Dulles, Virginia.
  • Tax Changes for Business Owners and Individuals  | January 19, 2019: Cascades Library, Sterling, Virginia. 
  •  Tax Changes for Individual Taxpayers  | December 12, 2018:  Ashburn Library, Ashburn, Virginia. 
  • New Tax Law Section 199A Deduction for Pass-through Business  | December 5, 2018: Sandy Spring Bank, Leesburg, Virginia.  
  • Taxes and Financial Reviews for Commercial Real Estate Buyers and Sellers  | October 12, 2018: Mid Atlantic Real Estate Marketing Association Annual  Meeting,  Flintstone, Maryland. 


  • Greater Reston Chamber of Commerce Business Education Series Co-sponsor:  Occurring from 8:30am to 10:00am on the 4th Wednesday of each month, the workshops are open to GRCC Members as well as the  general business community. The workshops are designed to support  business growth and cover a variety of topics including:
    • Information Technology
    • Finance
    • Health & Wellness
    • Business Development
    • Sales
    • Marketing
    • Legal
    • Staffing & Recruiting
    • HR
    • Leadership
    • Emerging Trends 

Media Mentions

  • Katherine  Johnson Dias. “Shrivastava GovCon Scholarship Recipient Committed to Serving Community as CPA, Business Owner.” George Mason University | December 17, 2018. (Learn More)


Contact Us

Let us know how we can help. Contact our accounting and tax professionals today for an evaluation of your needs.

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BAS Accounting Services, CPA

20130 Lakeview Center Plaza, Suite 400, Ashburn, Virginia 20147, United States

Telephone: (703) 840-5417 Email:


Professional Memberships