Forex Tax in Thailand — How Thai Traders Pay (or Don't)
For Thai tax residents, forex profits earned through offshore brokers are taxable under Section 40(8) of the Revenue Code as "miscellaneous income." Crucially, before 2024, profits were taxed only when remitted to Thailand in the SAME calendar year. From January 2024, the Revenue Department closed this gap — overseas income is now taxable when remitted, regardless of when earned. Effective rate is the progressive personal income tax bracket (5% up to ฿150k, 35% above ฿5M). Keep broker statements + remittance bank records for 7 years.
Why Section 40(8) (not 40(4))
Section 40 of the Thai Revenue Code lists 8 categories of "assessable income." Forex profits don't fit cleanly into employment income (40(1)), professional services (40(2)-(6)), or interest/dividends (40(4)). They fall into 40(8) — the catch-all "miscellaneous income" category that includes capital gains on securities, gambling winnings, and trading profits.
This matters because 40(8) income is taxed at progressive personal-income rates (5%-35% based on bracket), NOT the 15% withholding rate on dividends or the special rate on stock capital gains. Forex profits are treated as ordinary income.
Section 40(8) also means losses can theoretically offset gains within the same tax year, but the Revenue Department doesn't accept self-reported losses without documented broker statements.
The 2024 remittance rule change
The old rule (pre-2024): Thai tax residents pay tax only on overseas income that was BOTH (a) earned in a Thai tax year AND (b) remitted to Thailand in that same year. If you earned forex profits in 2022 and brought them to Thailand in 2024, the income was tax-free under the "different year" exemption.
The new rule (from 1 January 2024 — Revenue Department Order Por 161/2566): overseas income is taxable when remitted to Thailand, regardless of when earned. This effectively closes the loophole long-term Thai expatriate traders used to defer tax indefinitely.
Practical impact: if you have an offshore broker account with $50,000 in profits accumulated over 5 years and you transfer $20,000 to your Thai bank in 2025, the $20,000 is taxable in 2025 even though much of it was earned earlier. Documentation matters more than ever.
How much will you actually pay?
Thai personal income tax is progressive:
- ฿0 – ฿150,000: 0% (exempt) - ฿150,001 – ฿300,000: 5% - ฿300,001 – ฿500,000: 10% - ฿500,001 – ฿750,000: 15% - ฿750,001 – ฿1,000,000: 20% - ฿1,000,001 – ฿2,000,000: 25% - ฿2,000,001 – ฿5,000,000: 30% - Above ฿5,000,000: 35%
Forex profits are added to your other taxable income (salary, freelance, rental). A Thai trader earning ฿800k from a day job and ฿500k from forex profits remitted that year is in the 20%-25% bracket.
Several deductions apply: ฿100,000 standard expense, ฿60,000 personal allowance, ฿30,000 spouse allowance (if applicable), provident fund contributions, RMF/SSF investments. Net taxable income = total income − deductions.
What records to keep
Keep all of the following for 7 years (Thai Revenue audit window):
- Monthly broker statements (downloadable from broker portal — keep PDFs) - Annual P&L reports from the broker - All deposit + withdrawal confirmations (TT slip from Thai bank, blockchain TX hash if crypto) - IB / rebate aggregator statements (TradingEdge issues these on request) - Documentation of trading activity for any year you claim was loss-generating
If the Revenue Department audits you and you cannot produce broker statements, they will assess tax on the gross remittance — meaning $20k brought in is treated as $20k of profit, not net of cost basis. This single rule justifies fastidious record-keeping.
Frequently asked
Do I have to file taxes if I never withdraw to Thailand?
Under the post-2024 rule, only remitted income is taxable. If your forex profits stay in the offshore broker or move to a non-Thai bank account and never enter Thailand, no Thai tax is due. Caveat: if you are physically resident in Thailand for 180+ days/year you are still expected to declare worldwide income on annual filings even if no remittance occurred.
Is rebate income separately taxable?
Rebates are treated as a reduction in trading cost, not standalone income. They appear on your broker statement as deposits, but they offset the spread + commission cost. Net P&L (after rebate) is what you report.
What about prop firm payouts?
Prop firm payouts to your offshore broker or e-wallet account are profit. When eventually remitted to Thailand, they're taxable under Section 40(8) the same as direct broker profits.
Should I get a tax accountant?
For total annual forex P&L over ฿1M, yes — the deduction strategies (RMF/SSF, expense optimization) are worth more than the accountant fee. Below that, the Revenue Department's online filing system handles it.