William T. Armacost, CPA


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Previous to joining Santos Postal, Bill Armacost and Tony Orsborne were business partners at their own accounting firm. In 2007, they merged with Santos Postal. “Although we looked at other potential firms for the merger, Santos Postal had the best practice and the nicest people.”

Bill’s focus is on business financial statements and taxes, as well as individual taxes. “I have never lost a client from dissatisfaction. Clients expect you to take care of their needs on time.”

"There are many diverse personalities at Santos Postal, and we are all working toward the same outcome.”


University of Maryland, BS, Accounting 


Certified Public Accountant

Awards/Memberships/Community Involvement: 

Member, American Institute of Certified Public Accountants (AICPA)
Member, Maryland Association of Certified Public Accountants (MACPA)
Member, Virginia Society of Certified Public Accountants