Tax Filing Calendar 2026
Every tax return and social security contribution deadline for the year, for Thai companies — already adjusted for the 2026 holiday calendar.
Updated August 2026
Every date here is an online filing deadline
The Revenue Department extends internet filing deadlines by 8 days, in effect through 31 January 2027, and the Social Security Office allows 7 additional business days for e-Payment beyond the standard 15th of the following month.
Coming Up
In 10 days
26 Oct 2026
P.P.30 for Sep
In 11 days
27 Oct 2026
Social Security for Sep
In 31 days
16 Nov 2026
P.N.D.1/3/53 for Oct
Monthly Deadlines
Tax Month
P.N.D.1 / 2 / 3 / 53
P.P.30 / P.T.40
Social Security
January 2026
16 Feb
23 Feb
25 Feb
February 2026
16 Mar
23 Mar
25 Mar
March 2026
16 Apr
23 Apr
27 Apr
April 2026
15 May
25 May
26 May
May 2026
15 Jun
23 Jun
24 Jun
June 2026
15 Jul
23 Jul
24 Jul
July 2026
17 Aug
24 Aug
26 Aug
August 2026
15 Sep
23 Sep
24 Sep
September 2026
15 Oct
26 Oct
27 Oct
October 2026
16 Nov
23 Nov
25 Nov
November 2026
15 Dec
23 Dec
24 Dec
December 2026
15 Jan 2027
25 Jan 2027
26 Jan 2027
Annual Deadlines
Based on a 1 January – 31 December 2025 financial year, with the annual general meeting held by 30 April 2026.
Return / Item
What it is
Due
Kor.Ror.11
Employment condition report (employers with 10+ staff)
2 Feb 2026
Kor.Tor.20 Kor
Wage report, Workmen’s Compensation Fund
2 Mar 2026
P.N.D.1 Kor
Annual payroll withholding tax summary
9 Mar 2026
P.Por.1
Signboard tax (filed with the local authority)
31 Mar 2026
P.N.D.90 / 91
Annual personal income tax
8 Apr 2026
Land & Building Tax
Paid to the local authority, per its announcement
During Apr 2026
Shareholders’ Meeting
Annual general meeting (AGM)
By 30 Apr 2026
Bor.Or.Jor.5
Shareholder register (within 14 days of the AGM)
14 May 2026
Financial Statements
Filed with DBD e-Filing (within 1 month of the AGM)
2 Jun 2026
P.N.D.50
Annual corporate income tax
8 Jun 2026
P.N.D.51
Half-year corporate income tax (2026 period)
8 Sep 2026
P.N.D.94
Half-year personal income tax
8 Oct 2026
Notes
Annual deadlines depend on each company’s financial year and AGM date. This table uses a 31 December year-end as the example.
Signboard tax and land and building tax depend on each local authority’s own announcement.
This is general guidance, not advice for a specific company. Please check your own situation with our team.
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