PND 50: Thailand's year-end corporate income tax return explained

EXACCOUNTINGAccounting & tax

2 November 2026

PND 50 is Thailand's year-end corporate tax return. See the deadline, SME rates, a worked example, attachments and why no-income companies still file.

PND 50 is the corporate income tax return for the end of an accounting period. Companies and juristic partnerships must file within 150 days of the last day of the period, even for a year with a loss or no income. If you are preparing it yourself, start from closed financial statements, not your bank balance.

Who has to file PND 50?

Companies and juristic partnerships taxed on net profit for an accounting period file this return. The Revenue Department's SME guide clearly states that a net loss or no income still requires filing.

What is the PND 50 deadline?

Under the law: within 150 days of the last day of the accounting period
Online: extended to 158 days, only for deadlines through January 31, 2027 under the current notification

A company closing on December 31, 2026 has a PND 50 deadline in 2027, so it should not count on those 8 days until a renewal is announced.

What is the corporate income tax rate?

The general rate is 20% of net profit. A business meeting the SME conditions, with paid-up capital up to 5 million baht and revenue from sales and services up to 30 million baht, uses tiered rates:

Net profit up to 300,000 baht: exempt
Portion from 300,000 to 3,000,000 baht: 15%
Portion above 3,000,000 baht: 20%

Check the capital and revenue conditions for that accounting period. Do not assume SME status just because the business is small.

A worked example

Hypothetical example: an SME-qualifying company has net profit of 1,000,000 baht.

First 300,000 baht: exempt
Remaining 700,000 baht × 15% = 105,000 baht
Tax in this example = 105,000 baht before eligible credits

Tax paid through PND 51 and tax withheld at source can be credited against this with valid evidence.

Is accounting profit the same as taxable profit?

Not always. Profit in the statements is the starting point, but some items must be adjusted under tax rules, such as expenses the law does not allow. So do not simply multiply accounting profit by the tax rate.

What should you prepare?

Financial statements for the period, with audit results as the law requires
A summary of tax adjustments to profit
Details of PND 51 tax already paid
Withholding tax certificates received

Start with the year-end closing steps, because PND 50 figures cannot be finalized until the accounts are closed.

What does late or incorrect filing cost?

Late tax payment incurs a surcharge under the Revenue Code, and failing to file on time carries a fine. If you find an error, check an additional filing with your accountant quickly. Surcharges and penalties depend on the case, so do not estimate from another business's example.

A filing service does not replace responsibility for the data your business provides, so check major revenue and expenses before confirming the figures. If you want help, our tax team can set a calendar and prepare the return.