2026 Southeast Asia Tax Calendar
Key dates for tax filings and compliance deadlines in Southeast Asian markets in 2026.
January 2026
Vietnam monthly VAT deadline (December)
Monthly VAT return filing deadline for December 2025 transactions in Vietnam.
Thailand PND1 withholding tax filing
Monthly withholding tax return filing deadline for Thai businesses.
February 2026
Indonesia monthly VAT deadline (December)
Monthly VAT return (SPT Masa PPN) filing deadline for December 2025 in Indonesia.
March 2026
Indonesia annual corporate tax return
Annual corporate income tax return (SPT Tahunan Badan) filing deadline in Indonesia.
April 2026
Philippines Q1 quarterly VAT deadline
Quarterly VAT return filing deadline for Q1 2026 in the Philippines.
Vietnam Q1 CIT provisional payment
First quarter corporate income tax provisional payment deadline in Vietnam.
May 2026
Thailand annual corporate tax return (PND50)
Annual corporate income tax return filing deadline for calendar year companies in Thailand.
June 2026
Malaysia e-invoicing Phase 2 begins
Phase 2 of Malaysia's mandatory e-invoicing requirement extends to businesses with revenue above MYR 25 million.
July 2026
Indonesia annual individual tax return
Extended deadline for annual individual income tax return (SPT Tahunan OP) in Indonesia.
September 2026
Singapore corporate tax return (Form C-S/C)
Annual corporate income tax return filing deadline for Singapore companies.
November 2026
Malaysia e-invoicing Phase 3 begins
Phase 3 extends e-invoicing to all remaining businesses in Malaysia.
December 2026
Southeast Asia year-end compliance review
Year-end deadline for tax compliance review across all Southeast Asian markets.