Audit & AccountingSilver report

Published January 2026Insight Research14 min read2026 Edition14 sources, 14 primary-gradeStrong source depth

Thailand Audit & Accounting Market Intelligence

Thai audit, accounting ~THB 29B. Big 4 ~55% (Deloitte, EY, KPMG, PwC) dominate listed, MNC audits. FAP, SEC regulate; TFRS converges with IFRS.

Key takeaways

1
Thai audit, accounting services ~ in 2024 — triangulated from FAP CPA registry (~60,000 CPAs), SEC approved-auditor list, Big 4 Thailand disclosures, DBD financial-statement filing registry. Firm-tier mix Big 4 ~ > international mid-tier ~ > local Thai ~ > outsourced ~.
2
Big 4: Deloitte Touche Tohmatsu Jaiyos (Deloitte Thailand), EY Office, KPMG Phoomchai Audit, PwC Thailand (ABAS, ProfServices). Dominate SET-listed, MNC subsidiary audits. International mid-tier: BDO Thailand, Grant Thornton, Forvis Mazars (Mazars, Forvis merger 2024), RSM, Baker Tilly, Crowe, HLB.
3
Regulatory: Federation of Accounting Professions (FAP / TFAC) licenses CPAs, sets Thai Financial Reporting Standards (TFRS — IFRS-converged for listed, PAEs). SEC approved-auditor list, auditor-rotation rules (10-year mandatory partner rotation for listed-company audits), Key Audit Matters (KAM) disclosure. Revenue Department enforces tax-compliance audits.
4
Growth drivers: Pillar Two (global minimum tax) compliance, transfer pricing, sustainability-assurance mandates (Thai SEC SD / ESG disclosure, GRI, ISSB / IFRS S2 convergence), digital-asset audit, TFRS-17 insurance contracts implementation. Outsourced accounting, bookkeeping expanding as SMEs digitise.
5
Headwinds: auditor-rotation churn; talent-pipeline pressure (CPA certification, post-audit career exit to industry); fee-pressure on listed-company statutory audits as public-company boards rebid; local-firm succession, consolidation as founding partners retire.

Executive summary

Thailand's audit, accounting services market is ~ (~) in 2024, triangulated from FAP CPA registry (~60,000 active CPAs), SEC approved-auditor list (~250 firms), Big 4 Thailand disclosures, and DBD financial-statement filing registry. Firm-tier mix: Big 4 ~, international mid-tier ~, local Thai mid-tier, boutique ~, outsourced accounting, bookkeeping ~.^{[, , ]}

Big 4 firms: Deloitte Touche Tohmatsu Jaiyos (Deloitte Thailand), EY Office (EY Thailand), KPMG Phoomchai Audit (KPMG Thailand), PwC Thailand (ABAS audit arm, ProfServices advisory arm). Dominant on SET-listed company audits, MNC Thai-subsidiary audits. International mid-tier: BDO Thailand, Grant Thornton Thailand, Forvis Mazars (post-2024 Mazars, Forvis global merger), RSM Thailand, Baker Tilly, Crowe, HLB. Local Thai mid-tier, boutique: Karin Audit, Sawetakul Audit, Dr. Virach & Associates, plus numerous single-partner firms serving SME, DBD-filing work.^{[, , , , , , ]}

Regulatory, standards: FAP (Federation of Accounting Professions, also known as TFAC) under MOE licenses CPAs, sets Thai Financial Reporting Standards (TFRS — IFRS-converged for listed companies, publicly-accountable entities; TFRS for NPAEs for non-listed). SEC approved-auditor list governs listed-company audit eligibility. SET, SEC enforce 10-year mandatory partner rotation, Key Audit Matters (KAM) disclosure. Revenue Department enforces tax-compliance. Growth drivers: Pillar Two global minimum tax (OECD Pillar Two implementation 2025+), transfer pricing documentation, sustainability assurance (SEC SD / ESG, GRI, ISSB / IFRS S2 convergence), digital-asset audit, TFRS-17 insurance contracts.^{[, , , , ]}

FAP, SEC, Big 4 filings, DBD, World Bank ROSC

Data as of: FY2024

Thai audit, accounting market (THB billion, 2020-2024)

2020

Market (THB B)

Context

COVID slowdown; remote audit transition

2021

Market (THB B)

Context

Digital audit, TFRS-16 leases adoption

2022

Market (THB B)

Context

IPO, M&A pipeline recovery

2023

Market (THB B)

Context

Sustainability assurance, PDPA compliance

2024

Market (THB B)

Context

Pillar Two prep, TFRS-17 insurance, SD disclosure

Year	Market (THB B)	Context
2020	22	COVID slowdown; remote audit transition
2021	23	Digital audit, TFRS-16 leases adoption
2022	25	IPO, M&A pipeline recovery
2023	27	Sustainability assurance, PDPA compliance
2024	29	Pillar Two prep, TFRS-17 insurance, SD disclosure

FAP, SEC, Big 4 disclosures, DBD triangulation

Data as of: 2024

Firm-tier mix (% FY2024)

Big 4

Share %

55%

Leaders

Deloitte, EY, KPMG, PwC

International mid-tier

Share %

18%

Leaders

BDO, Grant Thornton, Forvis Mazars, RSM, Baker Tilly, Crowe, HLB

Local Thai mid-tier, boutique

Share %

22%

Leaders

Karin, Sawetakul, Dr. Virach, single-partner firms

Outsourced accounting, bookkeeping

Share %

Leaders

BPO, cloud-accounting platforms

Tier	Share %	Leaders
Big 4	55%	Deloitte, EY, KPMG, PwC
International mid-tier	18%	BDO, Grant Thornton, Forvis Mazars, RSM, Baker Tilly, Crowe, HLB
Local Thai mid-tier, boutique	22%	Karin, Sawetakul, Dr. Virach, single-partner firms
Outsourced accounting, bookkeeping	5%	BPO, cloud-accounting platforms

FAP, SEC, Big 4, mid-tier disclosures

Data as of: FY2024

Analyst framing

Why this report

Thai audit, accounting is Big 4-dominated on listed, MNC, international mid-tier covering regional, local firms. Pillar Two, sustainability assurance, TFRS-17 expand the fee base; auditor rotation, talent pipeline, succession compress margins.

Firm playbooks

Big 4: Deloitte Touche Tohmatsu Jaiyos (Deloitte Thailand) competes primarily on SET-listed, MNC subsidiary audits. EY Office (EY Thailand) similarly focused. KPMG Phoomchai Audit runs the KPMG Thai audit practice — tightly integrated with KPMG global network. PwC Thailand operates PwC ABAS (audit arm), ProfServices (advisory). Big 4 combined capture ~55% of the Thai audit, accounting services fee pool, concentrated on listed, regulated-industry (banks, insurers, telcos, utilities), and MNC-subsidiary audits.

International mid-tier: BDO Thailand (Thai network member), Grant Thornton Thailand (GT network), Forvis Mazars Thailand (post-2024 Mazars, Forvis merger), RSM Thailand, Baker Tilly, Crowe, HLB. Capture mid-cap SET, non-listed Thai-conglomerate subsidiaries, MNC-subsidiary audits where Big 4 are fee-prohibitive. Combined ~18% share.

Local Thai mid-tier, boutique: Karin Audit, Sawetakul Audit, Dr. Virach & Associates, plus single-partner firms. Serve SET, MAI, non-listed Thai companies, DBD-filing SME work. ~22% share in aggregate. Long-tail of ~250 SEC-approved audit firms (many single-partner) handles DBD statutory-audit filings for private companies. Outsourced accounting, bookkeeping (~5% share) is growing as SMEs adopt cloud-accounting platforms (Xero Thailand, PEAK, FlowAccount, Sage), BPO services.

Regulation, TFRS, Pillar Two, sustainability

FAP (Federation of Accounting Professions / TFAC) under Ministry of Education licenses CPAs, sets Thai Financial Reporting Standards (TFRS — IFRS-converged for listed, PAEs), TFRS for NPAEs (non-publicly-accountable entities). SEC approved-auditor list governs listed-company audit eligibility. SET, SEC enforce 10-year mandatory partner rotation, Key Audit Matters (KAM) disclosure under TSA 701. Revenue Department enforces tax-compliance audits, transfer pricing documentation thresholds.

Practice drivers: Pillar Two (OECD global minimum tax) implementation for Thai-HQ multinational groups, inbound-FDI subsidiaries drives compliance, transfer pricing fee uplift 2025+. Sustainability assurance (SEC SD / ESG disclosure requirements, GRI, ISSB / IFRS S2 convergence, TCFD) creates a new assurance service line. TFRS-17 insurance contracts implementation (delayed from 2023 to 2025 for Thai insurers) is the largest near-term technical project. Digital-asset audit, crypto-exchange custody assurance grows with SEC digital-asset enforcement. World Bank ROSC A&A Thailand (2023 latest) benchmarks Thai practice against IFAC, IAASB standards.

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Key figures

Selected anchors from the report evidence pack.

FY2024

~THB 29B

Thai audit, accounting services market

FAP, SEC, Big 4 Thailand, DBD

FY2024

~55%

Big 4 audit market share

Big 4 Thailand disclosures, SEC approved-auditor list

FY2024

~60,000

Registered Thai CPAs

FAP / TFAC CPA registry

FY2024

10-year

SEC mandatory audit-partner rotation

SEC Thailand, FAP

FY2024

~22%

Local Thai mid-tier, boutique share

FAP, DBD, Insight triangulation

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