ABC CPAs is a Los Angeles accounting and advisory firm serving clients since 1993. Led by founder and managing partner ByungChan Ahn, CPA, the firm works with businesses, individuals, nonprofit organizations, investors, U.S. subsidiaries, and companies with foreign parent organizations. It provides coordinated support across accounting, taxation, financial reporting, assurance, payroll, and business transactions, with services for organizations operating in multiple states or across borders.

Its offerings include bookkeeping, monthly accounting, financial statement preparation, audits, reviews, and compilations. Tax services cover federal, state, local, multi-state, and cross-border compliance and planning, including estate, gift, and succession matters. ABC CPAs also assists employers with payroll processing and related tax filings, and helps clients respond to tax notices, examinations, and appeals. For significant business decisions, the firm provides specialized tax analysis, merger and acquisition support, due diligence, and advice on transactions and ownership changes. ABC CPAs emphasizes professional experience, coordinated service, clear communication, and long-term client relationships. Korean-language consultation is available.