Annual audit services in Thailand.
Every Thai company is required to undergo an annual audit by a licensed Thai CPA. We prepare the audit pack to a standard that minimises auditor questions, manage the relationship, and file the audited accounts with the DBD within deadline.
What is the statutory audit?
Thai law treats the annual audit as a baseline obligation, not an optional extra. Every registered company — and most registered partnerships, and even dormant companies that recorded no transactions during the year — must have its annual financial statements examined by a licensed Thai Certified Public Auditor.
There is no small-company exemption: turnover and headcount make no difference to whether an audit is required. Financial statements are prepared under the Thai Financial Reporting Standards (TFRS) or, for small and medium-sized entities, under TFRS for Non-Publicly Accountable Entities, then audited against the Thai Standards on Auditing.
The audit must be carried out by an independent CPA — a company cannot audit itself, and the directors cannot sign off their own accounts in place of an auditor. The result is an independent opinion that the financial statements give a true and fair view, which is what the AGM approves and what is ultimately filed with the authorities.
More than a signature on the accounts.
A full statutory audit covers the examination, the auditor's opinion, and the filings that follow — each with its own form, format and deadline.
Independent examination
A licensed CPA examines the financial statements, testing the figures against the underlying records and supporting evidence.
Auditor's report and opinion
The statutory auditor issues a signed report stating whether the statements give a true and fair view under the applicable standards.
Accounts for the AGM
The audited statements are prepared and packaged for approval by shareholders at the annual general meeting.
DBD e-Filing in XBRL
The approved statements are submitted to the Department of Business Development through its e-Filing system in XBRL format.
PND 50 tax return
The corporate income-tax return is prepared and filed with the Revenue Department, reconciled to the audited figures.
Reconciliation of the year
The accounts are reconciled against the year's VAT, withholding-tax and social-security filings so the figures tie out across every authority.
What the auditor needs, and when it is due.
A clean, complete document set is what keeps an audit moving — and the statutory calendar leaves little room to drift.
Documents the auditor needs
- The year's income and expense records, with the monthly returns — PND 1, 3 and 53, PP30 and PP36, and social security
- Bank statements for every account held during the year
- Inventory listings and stock cards
- The lease agreement for the company's premises
- Copies of any land title deeds
- The prior year's audited statements, PND 50, general ledger, trial balance and fixed-asset register
- The company seal
- The half-year report — PND 51
Key deadlines
- The AGM must approve the audited statements within four months of the financial year-end
- The audited statements must be filed with the DBD within one month of the AGM, via e-Filing
- The PND 50 corporate income-tax return must be filed within 150 days of the year-end
The rules tightened — and the costs of missing them are real.
- The DBD now requires financial statements to be filed electronically in XBRL format through its e-Filing system — paper submission is no longer the route.
- There is still no audit exemption for small or dormant companies; every limited company needs a full CPA audit regardless of size or activity.
- Penalties bite hard: late or non-filing of financial statements can reach up to THB 50,000 for the company and a further THB 50,000 for each responsible director. Failing to keep proper accounts can carry penalties of up to THB 200,000 under the Accounting Act, and failing to hold the AGM can cost up to THB 20,000.
From audit to filing, step by step.
Each stage has a fixed sequence and a fixed clock — handled in order, the whole cycle stays comfortably inside the statutory deadlines.
Audit and signing
The auditor completes the audit and signs the report; a director then reviews and signs the financial statements.
Settle tax due
Any corporate income tax payable on the year's results is settled with the Revenue Department.
Hold the AGM
The AGM is convened on at least seven days' notice and approves the accounts within four months of the year-end, with minutes recorded.
File with the DBD
The audited statements are filed with the DBD via e-Filing within one month of the AGM.
File the PND 50
The corporate income-tax return is filed with the Revenue Department within 150 days of the year-end.
How we get you audit-ready.
Every Thai limited company must have its annual financial statements audited by a CPA licensed by the Federation of Accounting Professions, and must file those audited accounts with the DBD within one month of the AGM (which must happen within four months of the financial year-end).
The audit itself is not a Khonsu service — Thai law requires an independent CPA. What we do is prepare the audit pack: full ledger, reconciliations, supporting schedules, fixed-asset register, related-party disclosures, and the draft financial statements. A clean pack means the auditor signs in days, not months.
We work with a panel of CPAs we trust and can recommend one for new engagements, or work alongside an auditor you already have.
What we do
- Audit-readiness review 60 days before year-end
- Full audit pack preparation: ledger, schedules, reconciliations
- Fixed-asset register and depreciation schedules
- Related-party transaction disclosures
- Draft financial statements in IFRS / TFRS format
- Auditor liaison through the engagement
- Audit-adjustment recording and re-running of accounts
- DBD filing of audited accounts within deadline
- Corporate tax return (PND 50/51) reconciled to audited accounts
What you get
- 60-day pre-audit review surfaces issues before the auditor finds them
- Bilingual schedules for foreign-owned companies whose head office reviews the file
- Filing deadlines tracked on the compliance calendar
How we work
Pre-audit review
About 60 days before year-end we review the books, identify any reconciling items, and adjust before the auditor sees them.
Year-end close
Final entries, accruals, depreciation, and tax provisions booked.
Audit pack handover
Auditor receives a complete pack — ledger, schedules, reconciliations, supporting documents.
Auditor liaison
We answer auditor queries and source any additional documentation through the engagement.
Adjustments and signing
Audit adjustments booked, financial statements signed, AGM held, DBD filing made.
Speak with our team
Send a message — typical response within one hour during office hours.
WhatsApp +66 95 332 2447 Send an Enquiry Call +66 2 026 0600Frequently asked
When does the audit happen?
Most Thai companies have a 31 December year-end and run the audit January–March. AGM by 30 April, DBD filing by 31 May. We schedule everything against that calendar.
Can I use my own auditor?
Yes — we have no preference. If you don't have one, we can recommend a panel of CPAs we trust.
What if there are restatements from prior years?
Restatements are handled in the audit and disclosed in the financial statements. We work them through with the auditor.
How are audit fees set?
Auditor fees are charged by the CPA firm, separately from our work, and scale with company size and transaction volume. Our audit-pack preparation fee is scoped per engagement after we review the books. We can introduce you to auditors on request.
Reviewed by the Khonsu Legal team · 1 July 2026
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