Accounting & Bookkeeping

Legally required. Under the Accounting Act B.E. 2543, every Thai juristic person must appoint a Thai-qualified accountant (degree in accounting or TFAC-registered) and books must be maintained in Thai language and Thai baht. A foreign bookkeeper can produce management accounts in English, but the statutory submission must be signed off by a Thai accountant and audited by a TFAC-licensed CPA.

Dormant: ฿2,500/month. Non-VAT SME (under ฿1.8M revenue, fewer than 5 staff): ฿4,500/month. VAT-registered with up to 100 transactions and 10 staff: ฿9,500/month. BOI / Treaty of Amity / FBL: from ฿15,000/month. Year-end audit is included in every monthly plan — most firms bill it separately at ฿25,000–฿60,000.

From 1 January 2024, the Revenue Department reinterpreted Section 41(2): foreign-sourced income earned by a Thai tax resident (180+ days in a calendar year) is now taxable in Thailand in the year it is remitted, regardless of when it was earned. Pre-2024 savings remitted now remain exempt if you can document them. We model the position, claim double-tax treaty relief (the UK, US, Australia and most EU treaties protect taxed-at-source income), and time remittances to minimise exposure. LTR-visa holders are exempt.

Within 30 days of the month in which cumulative revenue exceeds ฿1.8M in a calendar year. Voluntary registration earlier is common — it lets you reclaim input VAT on capital purchases and lifts you out of the SME perception ceiling. The rate is 7% (extended to 30 September 2026).

PND.1/3/53 late filing: ฿200 per form + 1.5% monthly interest. PP.30: ฿500 per form + 1.5% monthly + a surcharge of up to 2× the tax shortfall for understated VAT. SSO: 2% per month on unpaid contributions. PND.50 late filing: ฿2,000 + 1.5% monthly + DBD director-personal-liability exposure. Repeat lateness triggers a Revenue audit.

Whenever a Thai company pays for a service, it withholds tax at source: 3% for most professional services and rentals, 5% for advertising and prizes, 1% for transport, 2% for construction. The withholder issues a 50 Bis certificate to the supplier and remits the tax via PND.3 (paying an individual) or PND.53 (paying a company) by the 7th. Get this wrong and the Revenue treats your expense as non-deductible.

Standard rate: 20%. SME relief (paid-up capital ≤ ฿5M and revenue ≤ ฿30M): 0% on the first ฿300k, 15% on ฿300k–฿3M, 20% above. BOI-promoted activities: 0% for 3–8 years, then 20%. Half-year (PND.51) is due by end of August, full year (PND.50) within 150 days of year-end.

If you spend 180+ days in Thailand in a calendar year you are a Thai tax resident and must file PND.90 (mixed income) or PND.91 (employment income only) by 31 March. Even non-residents must file on Thai-sourced income — including salary from a Thai work permit. We handle the LTR flat-17% election, RMF/SSF deductions, life and health insurance allowances, and the 2024 remittance position.

Yes, and it is straightforward. We collect your trial balance, prior-year audited accounts, last-filed PND.50 and any open Revenue correspondence from your outgoing firm, reconcile to your bank statements and pick up filings the next month. The outgoing firm has a professional obligation to release records under TFAC rules.

Every filing for an Eastern Seaboard company — Chonburi Revenue, Chonburi Social Security, Chonburi DBD branch, Chonburi Provincial Office — is on our doorstep. We hand-file when the e-filing portal rejects a submission (which happens monthly), attend Revenue audits in person, and keep an audited paper trail in your office, not in a courier bag between Bangkok and Pattaya.