Accounting firmBangkokThai · English · French
Cloud-based accounting, tax filing & payroll for businesses in Thailand. All-inclusive pricing, zero hidden fees, 24/7 online access.
Practice area
Audit Firms in Thailand.
Find an audit firm in Thailand for statutory, financial, internal, and compliance audits. What each audit covers, who signs, and how to choose between firms.
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Featured firms
Featured audit firms in Thailand
GPS Accounting
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Accounting firmBangkokEnglish · Thai · Filipino · Swedish
Full service accountancy practice registered with the Thai Federation of Accounting Professions delivering accountancy and tax services in English.
Law firmBangkokEnglish · French · Thai
International firm in Asia since 2006 — corporate legal, accounting, advisory and audit services across Thailand, China & the Philippines.
Key facts
- Who can sign an audit opinion in Thailand?
- A certified public accountant licensed by the Federation of Accounting Professions, the statutory body under the Accounting Professions Act B.E. 2547 that issues, suspends, and revokes practice licences and sets the auditing standards.
- Which audit does my company need every year?
- The statutory audit. The annual close ends with audited financial statements, and the audited figures feed the corporate income tax return due within 150 days of the accounting period's closing date.
- What is the difference between internal and external audit?
- External audits produce an independent opinion for readers outside management: the registrar, a parent company, a lender. Internal audit examines the company's own controls and risks and reports inside the company.
- What do audit firms charge?
- Fees follow entity size, transaction volume, and the condition of the books, and firms quote after seeing them. There is no standard market price, so compare written scopes rather than headline figures.
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Audit firm or accounting firm: who does what?
An accounting firm keeps the books: it records what happened, prepares the financial statements, and files the returns. An audit firm in Thailand does something structurally different: it stands outside that work and gives an independent opinion on it. In Thailand the person who signs an audit opinion is a certified public accountant licensed by the Federation of Accounting Professions, the statutory body that also sets the Thai Standards on Auditing the work must follow.
That independence is the reason the two roles cannot collapse into one. The auditor who signs your statements cannot be the bookkeeper who prepared them, which is why even small companies end up with two firms, or one firm with a properly separated audit arm.
When companies need an audit firm in Thailand
Four situations cover most engagements.
The annual audit the law requires. For companies in Thailand the annual close ends with audited financial statements, and the audited numbers feed the corporate tax return due within 150 days of the accounting period's close. This recurring engagement is the statutory audit, and it is the audit most companies mean when they say they need an auditor.
Every other financial statement audit. Group reporting packages for a foreign parent, special purpose statements, and lender-requested audits follow the same standards but serve a chosen reader rather than a legal filing. That work is a financial audit engagement, and its scope is set by whoever asked for it.
Looking inward rather than backward. Internal audit examines the company's own controls, processes, and risks on management's or the board's behalf. It is continuous rather than annual, and its report goes inside the company, not to a registrar.
Checking against a rulebook. A compliance audit tests the company against a specific external requirement: a regulator's conditions, a licence, a certification, or a contract. The deliverable is a finding on conformity rather than an opinion on the accounts.
All firms
All audit firms in Thailand
Accounting firmBangkokThai · English · French
Cloud-based accounting, tax filing & payroll for businesses in Thailand. All-inclusive pricing, zero hidden fees, 24/7 online access.
GPS Accounting
Free consultation
Accounting firmBangkokEnglish · Thai · Filipino · Swedish
Full service accountancy practice registered with the Thai Federation of Accounting Professions delivering accountancy and tax services in English.
Law firmBangkokEnglish · French · Thai
International firm in Asia since 2006 — corporate legal, accounting, advisory and audit services across Thailand, China & the Philippines.
Law firmBangkokEnglish · Thai · Spanish
Experts assisting clients in conducting their businesses and protecting their rights and investments in Thailand across a wide range of legal matters.
Who regulates auditors in Thailand
The Federation of Accounting Professions, established under the Accounting Professions Act B.E. 2547, licenses certified public accountants, sets financial reporting and auditing standards, and monitors how registrants practice. When you engage an audit firm, the signing auditor's CPA licence is the credential that makes the opinion count, so confirming who will actually sign is a fair first question.
The filing side sits with the Department of Business Development, which receives financial statements through its e-Filing system. The exact statement set and deadline depend on the entity type and year end, so the firm handling your close confirms them for your company rather than working from a generic calendar.
How to choose between audit firms
Three practical questions sort the field. First, does the firm's licence coverage match the engagement: a statutory audit needs a signing CPA, while internal audit work turns more on industry and controls experience than on the signature. Second, who does the fieldwork and in what language: working papers and DBD filings run in Thai, so ask how English reporting is handled if the readers of the report are abroad. Third, how is the fee scoped: audit fees follow entity size, transaction volume, and the state of the books, and a firm that quotes before seeing a trial balance is guessing. There is no standard market price, and this page does not invent one.
A warning sign is an auditor who offers to tidy the books they are about to audit. Independence rules exist precisely to keep those roles apart, and a firm casual about that boundary is a risk in the one engagement where independence is the product.
This page is general information, not legal advice. Standards, filing requirements, and procedures change; for a specific company, speak with a qualified professional. The firms below list their languages, locations, and areas of focus.
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Common questions
Frequently asked questions
- What does an audit firm in Thailand do?
- Four kinds of work cover most engagements: the statutory annual audit of the financial statements, other financial statement audits such as group packages and lender-requested audits, internal audit of the company's own controls and risks, and compliance audits against a specific regulatory or contractual rulebook. The common thread is independent examination rather than bookkeeping.
- Can my accounting firm also be my auditor?
- The firm that prepares your books should not sign the opinion on them. Auditor independence is central to Thai professional standards, so companies typically keep an accounting firm for the books and a separate audit firm, or use a larger firm with a properly separated audit practice. An auditor offering to fix the books they will audit is a warning sign.
- Who regulates audit firms in Thailand?
- The Federation of Accounting Professions, the statutory body established under the Accounting Professions Act B.E. 2547. It licenses certified public accountants, sets the Thai Financial Reporting Standards and Thai Standards on Auditing, and monitors the conduct of registrants. The Department of Business Development receives the filed financial statements.
- When are audited financial statements due in Thailand?
- The deadline depends on the entity type and the year end, and the statements are filed with the Department of Business Development through its e-Filing system. The related corporate income tax return is due within 150 days of the accounting period's closing date, so the audit is scheduled to finish well inside that window. The engaged firm confirms the exact dates for a specific company.
- How much does an audit cost in Thailand?
- There is no published standard fee. Audit pricing follows the size of the entity, the volume and complexity of transactions, and how clean the books are when the fieldwork starts. Serious firms scope the engagement first and quote in writing, so ask for the scope and the signing CPA's name together.
Guides & Insights
Practical explainers on this topic: general information, not professional advice.
Business & Corporate
Audit Requirements in Thailand: Who Needs One and When (2026 Guide)
Which companies and partnerships in Thailand must have their accounts audited, who is allowed to sign the opinion, and what happens once it is issued.
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