Tax Filing & Compliance

Tax filing & compliance is the monthly and annual discipline of submitting every Thai Revenue Code return — VAT (PP 30), withholding tax (PND 1/3/53/54), half-year CIT (PND 51), and annual CIT (PND 50) — accurately and by each statutory deadline. For a VAT-registered Thai company, this means at least two filings per month, every month, plus annual and semi-annual obligations.

Every Thai limited company with revenue above THB 1.8 million (VAT threshold) or with at least one employee needs ongoing tax compliance. Foreign-led SMEs, MNC subsidiaries with cross-border payments, and e-commerce businesses paying foreign platforms are the highest-risk categories if compliance is unmanaged or left to a part-time bookkeeper.

The Emergency Decree on Top-Up Tax (B.E. 2567), in force since 1 January 2025, applies a 15% global minimum tax to multinational enterprise groups with consolidated revenue ≥ EUR 750 million in at least 2 of the prior 4 fiscal years. Most SMEs are out of scope. If your Thai entity is part of a qualifying MNE group, the first GloBE Information Return is due in June 2027 for fiscal year 2025.

Under Revenue Code Section 27, late filing carries a 1.5% per month surcharge on unpaid tax, plus a THB 2,000 criminal fine under Section 35 per return. For VAT (PP 30), an additional THB 300 filing fine applies. A single missed PND 50 with THB 500,000 unpaid CIT can compound to THB 35,000+ in penalties within a year, before any audit consequence.

Ministerial Regulation No. 389 reduces WHT rates to 1% — from 3–7% standard — on hire-of-work, royalties, professional services, property rentals, and prize payments, when processed through the e-WHT system at a participating Thai bank. For a service company with THB 5–10 million annual sub-contractor spend, annual savings are THB 100,000–200,000. Plizz handles the bank integration and PND filing as part of the standard engagement.

PP 36 is a Thai buyer's obligation to self-assess and remit 7% VAT on services purchased from overseas providers — Google Ads, Meta advertising, AWS, foreign consultants, foreign software licences. The buyer files PP 36 by the 15th of the following month, pays the 7% to the Revenue Department, and claims it back as input VAT on the next PP 30. SMEs miss it because the foreign vendor invoice contains no Thai VAT. Missing PP 36 forfeits the input-VAT credit.

For a 31 December 2025 fiscal year-end, the 150-day deadline is 30 May 2026. PND 50 preparation requires the audited financial statements to be completed first, which means audit timing directly drives tax-filing timing. Plizz coordinates both under one engagement to prevent a delayed audit from cascading into a late PND 50 with surcharges.

Governance: Plizz is a registered firm under DFK International with named CPAs, internal review, and continuity if a staff member leaves. Integration: tax filings flow from Plizz bookkeeping, not a third-party data dump, eliminating reconciliation gaps. Scale: pricing sits between freelancer (no governance) and Big 4 (enterprise prices, junior staff). DFK provides the international network without the Big 4 cost.

A company that crossed the THB 1.8 million threshold without registering faces retrospective VAT liability — the Revenue Department can assess VAT on all sales from the date the threshold was crossed, plus a 1.5% per month surcharge and potential fines. Plizz's onboarding review flags this and can manage the voluntary disclosure process to minimize the retrospective liability before the Revenue Department discovers it independently.