How is the inheritance tax amount calculated in Thailand?

Inheritance tax is calculated separately for each beneficiary, based on the value of assets they personally receive, not on the total value of the deceased’s estate.

Here’s how it works step by step:

1. Determine the market value of the assets received by each beneficiary at the time they are inherited.

2. Deduct any legitimate debts or liabilities linked to those assets.

3. Apply the 100 million baht threshold — tax only applies to the portion exceeding this amount.

4. Apply the appropriate rate:

   • 5 % for direct descendants or ascendants (children, grandchildren, parents, grandparents)

   • 10 % for all other beneficiaries

Example:
If a beneficiary receives assets worth 120 million baht after debts, the taxable portion is 20 million baht. If that person is a child of the deceased, they would pay 5 % × 20 million = 1 million baht in inheritance tax.

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