Why Investment Income Matters for Retirees
For many retirees, investment income — interest, dividends, capital gains — makes up a significant portion of their income alongside pensions. Understanding how Thailand taxes each type is essential for effective retirement planning.
The good news is that some types of investment income carry lower tax rates than regular income, and in some cases the withholding tax paid at source is your only Thai tax obligation.
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Thai Bank Interest
How It's Taxed
Interest earned on deposits in Thai banks is subject to 15% withholding tax, deducted automatically by the bank before you receive the interest.
Your Options
You have two choices for how this is treated for tax purposes:
Option 1: Treat withholding as final tax
- The 15% withheld is your complete tax obligation on this income
- You do not include bank interest on your tax return
- Simple, no further action required
Option 2: Include in annual return
- You can choose to include the bank interest in your PND.90 return
- The 15% already withheld becomes a tax credit
- If your effective marginal tax rate is lower than 15%, you may receive a refund
- For retirees with low taxable income, this can sometimes result in a partial refund
When Option 2 Makes Sense
If your total taxable income (after allowances and the 65+ exemption) puts you in the 5% or 10% tax bracket, including bank interest in your return and claiming back excess withholding is worthwhile.---
Dividends from Thai Companies
Standard Treatment
Dividends paid by Thai companies are subject to 10% withholding tax deducted by the company paying the dividend.
As with bank interest, you can:
- Accept the 10% withholding as final tax (simpler)
- Include dividends in your annual return and claim the withholding as a credit
The Dividend Tax Credit
Thai companies pay corporate income tax before distributing dividends. To avoid double taxation of the same profits, you may be eligible for a dividend tax credit — an additional credit that partially offsets the tax already paid at the corporate level.
The credit calculation is complex. For most small investors, accepting the 10% withholding as final tax is simpler and often equivalent or better.
Thai Stock Exchange (SET) Capital Gains
Capital gains from selling shares listed on the Stock Exchange of Thailand (SET) are exempt from personal income tax for individuals.
This is a significant benefit for retirees who invest in Thai stocks — you can sell shares at a profit with no Thai capital gains tax obligation.
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Foreign Investment Income
The 2024 rule change has important implications for expats with foreign investment portfolios.
Foreign Bank Interest
Interest earned in overseas bank accounts is not taxable in Thailand unless remitted here. If you leave foreign interest income in your overseas account, it is not assessed.
Once you transfer it to Thailand, it becomes assessable income (as a Thai tax resident) and is included in your progressive income tax calculation. You can claim a foreign tax credit for any withholding tax paid in the source country.
Foreign Dividends
Dividends from overseas shares, ETFs, and funds:
- Not taxable in Thailand until remitted
- Once brought to Thailand, assessable as regular income
- Foreign withholding tax (e.g., 15% US dividend withholding) can be claimed as a credit
- Thailand taxes at progressive rates up to 35%; credit reduces the liability
Example: UK ISA Income Remitted to Thailand
A UK retiree has £20,000 (approx. 900,000 THB) of dividend income from ISA investments. ISAs pay dividends without UK tax. When this money is transferred to Thailand:
| Item | Amount |
|---|---|
| Dividend income brought in | 900,000 THB |
| 65+ exemption | −190,000 THB |
| Personal allowance | −60,000 THB |
| Remaining taxable | 650,000 THB |
| Tax on 650,000 THB | ~67,500 THB |
By contrast, if the retiree only remits 250,000 THB, taxable income after allowances is zero — no Thai tax at all.