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

(703) 840-5417 | CPA Firm License: 134476

Certified Public Accountant Firm

Helping clients to prosper through effective accounting, auditing, reviews, tax planning and preparation. 


Registered participants in our New Client Referral Network can earn $50 for each new client referral to BAS Accounting Services. Referral fees are earned for new customers who have not previously engaged BAS Accounting Services for services and are paid on first time invoices greater than $500. Join today on our Client Referral Network page. See details>>>

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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. 

Contact us today for an asseessment of your accounting service 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. 

Contact us today for an asseessment of your accounting service needs.

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

Speaking Engagements

  • Ashburn Library.  2018 Tax Changes for Individual Taxpayers. 45-minute. December 12, 2018. Ashburn, Virginia.
  • Sandy Spring Bank. New Tax Law Section 199A Deduction for Pass-through Business. 45-minute. December 5, 2018. Leesburg, Virginia.
  • Mid Atlantic Real Estate Marketing Association Annual  Meeting. Taxes for  Commercial Real Estate Buyers and Sellers. 45-minute. October 12, 2018.  Flintstone, Maryland.

Media Mentions

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


The first Recipient of Shrivastava GovCon Scholarship at GMU. December 2018.


Contact Us

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


BAS Accounting Services, CPA

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

Telephone: (703) 840-5417


Professional Memberships