Audit, Accounting, Tax and Advisory Services in Thailand

Eight service lines from a Bangkok firm in practice since 1982, serving Thai and foreign-owned companies, multinational subsidiaries, and international organisations from our Bangkok and Chiang Mai offices.

40+
Years in Thailand
1,000+
Clients served
30%
Foreign-owned
Top 20
Accounting firm
Our Service Lines

What we do, and how we work

Every engagement is partner-led, in Thai or English, on a fixed quote agreed before we start. Our quality assurance systems are subject to MGI Worldwide review against international standards, and through that network we can coordinate directly with your advisors in other countries.

Audit & Assurance

Statutory, internal, special-purpose and forensic audit, signed by licensed Thai CPAs and conducted to Thai and international standards.

A Thailand audit answers to two audiences at once: the authorities the financial statements are filed with, and the group auditors or head office that consolidate them. We plan engagements around both, so the statutory filing and your group reporting timetable are one exercise rather than two. Partners stay on the engagement from planning through to signing, which is why questions from a head office get answered by someone who did the work rather than passed down a chain.

Statutory annual audit of Thai companies, subsidiaries and representative offices
Audited financial statements for DBD and Revenue Department filing
BOI promotion audits and compliance reporting
Internal audit and special-purpose engagements
Forensic audit and investigation
IFRS and Thai GAAP reconciliation for group reporting
Full details on Audit & Assurance →

Accounting & Bookkeeping

Thai GAAP-compliant bookkeeping and reporting, delivered in Thai or English, for companies that would rather not run a finance function in-country.

Because we work on the audit side of this market every day, we know the condition records need to be in before year-end, and we keep them that way as we go. Everything is maintained in both Thai and English, so the ledger your Thai accountant reads and the report your head office reads are the same set of numbers rather than a translation of them. For a lean Thailand operation, that removes the need to hire a finance team purely to satisfy local reporting.

Monthly bookkeeping and ledger maintenance
Account review and reconciliation
Management reporting
Financial statement preparation
Year-end account closing
Full outsourced accounting for lean Thailand operations

Tax Advisory & Filing

Corporate and indirect tax compliance, planning, and representation before the Revenue Department.

Thai tax compliance is a calendar rather than an annual event: withholding and VAT every month, a half-year return, then the annual filing, each carrying its own penalty for being late or understated. We run that calendar so nothing arrives as a surprise, and where a position needs defending we deal with the Revenue Department directly on your behalf.

Corporate income tax computation and filing, annual and half-year
VAT and Specific Business Tax filing
Withholding tax compliance
Tax planning and structuring
Transfer pricing documentation and compliance
Revenue Department representation

Payroll Management

End-to-end payroll for employers in Thailand, covering the filings that follow every pay run.

Payroll is the compliance area your staff notice first, and the one where an error attaches to the employee rather than only to the company, since personal income tax, social security and provident fund obligations all sit with individuals. We treat the pay run and the filings that follow it as a single monthly process, so the amounts on the payslip and the amounts submitted to the authorities cannot drift apart. Confidentiality is handled the way it is for audit work, which matters when payroll data sits with an outside firm.

Monthly salary processing and payslips
Employee personal income tax filing
Social Security Office registration and monthly contributions
Provident fund compliance
Payroll reporting for group requirements

Company Formation

Full setup for foreign businesses entering Thailand, from registration through to ongoing compliance.

The decisions taken at incorporation, ownership structure, capitalisation, and whether to pursue BOI promotion, set the limits of what the company can do for years afterwards, and are expensive to unwind once trading has started. We work through those choices before registration rather than after it, with the Foreign Business Act constraints made explicit rather than discovered later. The same team then carries the entity through its first filings, work permits and audit, so nothing is handed to a stranger at the point it starts to matter.

Thai limited company registration
Foreign Business Act and ownership structuring advice
BOI applications and promotion support
Work permits and visa support
Ongoing statutory compliance after incorporation
Full details on Company Formation →

Advisory & Transactions

Transaction and advisory support for owners and boards, from listing preparation through to due diligence.

Transaction work rewards the same instinct as audit: knowing which numbers can be taken at face value and which have to be tested. Our advisory engagements are staffed on that basis, whether the goal is listing readiness, a sale, an acquisition, or an investigation into something that has already gone wrong. Where a deal crosses borders, MGI Worldwide gives us counterparts we know personally in the other jurisdiction, rather than a name found through a search.

IPO readiness and listing audit support
M&A support
Financial due diligence
Forensic investigation
Business consultancy

ESG & Sustainability

ESG assessment and reporting for organisations facing sustainability requirements from investors, lenders and group headquarters.

ESG requirements usually reach a Thailand entity from somewhere else: a lender's condition, an investor questionnaire, or a group sustainability report the local operation has to feed. The difficulty is rarely intent, it is working out which of those external demands translate into something your operation must actually measure and record. We start from the requirement you have been handed and work backwards to the data, so reporting is built on figures the business already produces wherever that is possible.

ESG assessment and reporting
Net-zero strategy support
ESG due diligence in support of ESG-linked financing

NGO Audit

A dedicated NGO and not-for-profit audit practice since 2010, experienced with European Commission, World Bank, NORAD, SIDA and Global Fund requirements.

An international organisation in Thailand answers to two systems at once: Thai regulators, and donors whose requirements were drafted somewhere else entirely. We have worked in the gap between them since 2010, which means we can tell you at the outset which engagement a given funder actually requires, and report in the format they expect rather than one that has to be redone. Fieldwork is not confined to Bangkok, having taken us to Chiang Mai, Chiang Rai, Pattani and Songkla, and across Laos, Cambodia and Myanmar.

Statutory audit of registered foundations and associations
Specific-purpose audit required by the Ministry of Labour for international NGO licence applications
Donor compliance audits and agreed-upon procedures (AUP)
Expenditure verification
Programme audits
Full details on NGO Audit →
Who We Work With

One firm, three kinds of client

Thai & Foreign-Owned SMEs

Full-service audit, accounting, tax, and payroll for growing businesses, Thai-owned or foreign-owned. Fixed fees, no hourly surprises.

International NGOs & NfPOs

Programmes funded by the European Commission, WHO, World Bank, NORAD, SIDA and the Global Fund, among others. We understand what your funders require.

Multinational Companies

Thailand subsidiaries needing a firm that understands both Thai regulation and international reporting, with MGI Worldwide connecting your HQ advisors to our Bangkok team.

Tell us what you need, and we will scope it properly.

Call us: +66 2630 7944  |  Email: contact@auditthai.com
Bangkok (HQ): 28th Floor, State Tower, 1055/523-524 Silom Road, Bangkok 10500
Chiang Mai: Starwork Chiang Mai, Room 100, Floor 1, 87/9 Tunghotel Rd, Wat Ket, Mueang Chiang Mai District, Chiang Mai 50000

Talk to our Partner