AO Accounting & Advisory Ltd., established 2006, is a Bangkok-based professional services firm providing accounting, tax, payroll and legal services to international businesses in Thailand.
As a Xero Gold Partner and Thailand’s accounting and tax member of the Alliott Global Alliance, we blend global best practices with extensive local expertise.
- Our expertise
International Excellence, Local Mastery.
At AO Accounting & Advisory, our strength derives from international experience across the United Kingdom, USA, Australia, Switzerland, Germany, Singapore, and Thailand, combined with a deep local understanding of the Thai business landscape.
We support foreign multinational companies, institutional investors and Thai-based companies with high-quality accounting, tax, payroll, and legal solutions . Our certified accountants and lawyers incorporate global best practices into every engagement, ensuring clarity, compliance, and confidence at every stage.
With AO, you work with a forward-thinking partner dedicated to helping your business expand, adapt, and succeed in Thailand.
- What we believe
Correct, Clear, and Compliant
At AO, we believe that everything must be accurate, transparent, and fully compliant. Our goal is to solve client problems with precision and integrity, ensuring every detail adheres to Thai accounting, tax, and legal requirements. Thailand’s regulations can be complex, but clarity should never be.
We simplify complex rules into clear guidance, empowering clients to make informed decisions confidently. For us, compliance is not just a service; it is our promise to protect your business and promote sustainable growth. With international expertise and deep local knowledge, AO stands with you as a trusted partner who keeps your operations correct, compliant, and progressing.
- Our purpose
Ensure Accurate Accounting and Full Regulatory Compliance
To provide bookkeeping, transparent financial reporting, and compliance with Thai tax and legal requirements, enabling clients to operate confidently with complete, compliant, and audit-ready records.
Simplify Doing Business in Thailand
To assist international companies with company incorporation, accounting setup, tax registrations, labour compliance, and corporate legal obligations, simplifying each step so they can concentrate on running and expanding their business.
Provide Practical Advice for Better Decision Making
Transform financial data and regulatory insight into clear, actionable advice that supports investment planning, cost control, risk management, and long-term success in Thailand.
Provide professional service with trustworthiness and honesty
Build trust through consistent quality, transparent communication, and a service excellence mindset—ensuring clients feel supported by a team that values accuracy, responsibility, and ethical practice.
Align International Expectations with Thai Compliance Standards
To unify various business practices by providing accounting, tax and compliance solutions that satisfy overseas investors’ needs while respecting Thailand’s intricate regulatory environment.
