Estimated Tax Payments: Do You Owe More?

A common surprise for foreign business owners in Thailand occurs on the tax portal: discovering they owe more than they expected. This happens when your monthly withholding tax (WHT) doesn't perfectly match your final liability.

 

Why Underpayment Happens

If you receive a fixed salary, your company usually calculates the withholding correctly. However, a "tax gap" occurs if:

• You received a large performance bonus late in the year.
• You have secondary income from rental properties or dividends.
• You work as a freelancer for multiple clients who each withhold a flat 3%.

 

The 50% Rule

For certain types of income (like rental or professional services), Thailand requires a "half-year" tax return (Por Ngor Dor 94) in September. If you missed this, you will have a larger balance to pay now in March.

 

Avoiding Interest Penalties

The Revenue Department charges 1.5% interest per month on any unpaid tax balance. By identifying your underpayment now in early March, you can ensure your funds are ready for the end-of-month payment, avoiding additional surcharges.

 

Payment Methods

Payments can be made via:

• QR Code on the RD portal (e-Payment).
• Internet Banking or Mobile Banking.
• Counter Service at most major banks or the Revenue Department office.

 

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Related Service: Accounting & Tax Compliance — Professional audit of your withholding statements to avoid surprises.