CST Group is a certified public accounting firm headquartered in Reston, Virginia, serving businesses and owners across the Washington, DC metro area. The firm provides tax, accounting, audit, forensic accounting, business advisory, and outsourced accounting services, with support available in person, onsite, and remotely.

Its work spans government contracting, healthcare, real estate, nonprofit, construction, and technology, along with entrepreneurs, investors, closely held businesses, and their owners. CST Group also supports clients with bookkeeping, payroll, sales tax, tax planning, new business formation, and IRS notice or audit help.

The firm describes a consultative approach focused on assurance, tax, and business advisory needs, including outsourced accounting through its client accounting services group. Its profile is best suited for organizations seeking broad CPA support across tax, advisory, and accounting operations.