If you received income in the first half of 2025, do not forget about your obligation to file a mid-year tax return. Below is a breakdown of when filing is required, which form to use, how the tax is calculated, and what documents are needed.
Reporting period and deadline
- Reporting period: January 1 – June 30, 2025
- Filing deadline: by September 30, 2025
- Form: PND94
- Tax: Personal Income Tax (PIT)
Who is required to file a mid-year return?
A mid-year return must be filed if total income for the first half of the year exceeds:
- 60,000 THB for an individual taxpayer
- 120,000 THB for spouses filing jointly
The following types of income are included (in accordance with the Thai Revenue Code):
- rental income, including real estate (Section 40(5))
- income from professional services (Section 40(6))
- income under contracts for work/services (Section 40(7))
- other income (Section 40(8))
Which income is not included?
The following income categories are reported only in the annual return (PND90 or PND91):
- employment income (Section 40(1))
- services income (Section 40(2))
- royalties and similar payments (Section 40(3))
- dividends, interest, and income from cryptocurrency sales (Section 40(4))
Required documents
- lease agreement (for rental income)
- bank statements
- payment receipts
- other supporting documents confirming income
How is the tax calculated?
The tax is calculated based on income for the first 6 months, with a projection for the full year.
Calculation steps:
- apply a personal allowance of 30,000 THB (annual — 60,000 THB)
- apply expense deductions (e.g., 30% for rental income)
- determine taxable income
- apply progressive PIT rates
- calculate the annual tax, divide it by 2 — this amount is payable as the mid-year tax
Important:
The tax paid for the first half of the year will be credited toward the total PIT liability for 2025.
Penalties for late filing
Late submission and non-payment of tax may result in penalties and surcharges. Therefore, it is advisable not to delay the preparation of your tax return.
Author: Alexandra Agapitova.
All rights reserved.
Copying and use of materials without written permission from the owner is prohibited.