The Trader’s Tax Handbook: How to Trade with Foreign Brokers Correctly and with Peace of Mind

Trading in global markets—whether it be CFDs, Forex, Gold, Foreign Stocks, or alternative currency pairs via foreign brokers—has become increasingly accessible to Thai people. Many have seized this opportunity to generate supplemental income or even build a primary career to support their families. However, alongside income opportunities comes the inevitable anxiety regarding "Taxes," especially following the recent adjustments to the criteria for collecting personal income tax from foreign sources over the past year.

Therefore, XM invites you to explore how to manage and plan your taxes, trader-style. Let’s look at why you should file and the steps involved in the process.

Why File Taxes on Profits? It’s More Than a Duty—It’s Financial Safety

Many might ask: Since we trade through foreign brokers, why do we still need to declare those profits to the Thai Revenue Department? Here are 3 crucial reasons every trader should know:

1. Fundamental Legal Duty of Income Earners According to the Revenue Code, Thailand utilizes the "Worldwide Income" principle coupled with the "Residence Rule." This means if you reside in Thailand for more than 180 days in a tax year and have income generated from anywhere in the world, once you bring that money into the country, the law considers it assessable income that must be declared. Filing taxes is not an option; it is a legal duty that demonstrates transparency regarding the source of your assets.

2. Data Reporting Systems of Banks and Related Agencies In the digital age, "financial secrecy does not exist." The Bank of Thailand and the Revenue Department have increasingly interconnected audit systems. This is particularly true with the e-Payment Law (reporting of receipt/payment account data), which requires financial institutions to send data on accounts with frequent transfers or high aggregate totals to the Revenue Department. Additionally, international cooperation on the Automatic Exchange of Information (AEOI) will make auditing foreign income as easy as a fingertip click in the future. Filing taxes voluntarily is the smartest method before being summoned for an audit.

3. Preventing Future Fines and Retroactive Taxes Tax evasion might seem to save money in the short term, but "fines" and "surcharges" in the long term are not worth it. If the Revenue Department detects discrepancies later, you may have to pay the tax plus fines of 1-2 times the amount, along with a surcharge (interest) of 1.5% per month. This could cause the profits you cultivated all year to vanish in a single retroactive tax payment. Filing correctly today is buying "peace of mind" and serves as the best Risk Management for your investment portfolio.

Trading with Foreign Brokers: Why You Can Be at Ease

First, it must be stated that "earning income from abroad is not illegal and is nothing to be afraid of."

Even though the new regulation (P.161/2566) stipulates that residents living in Thailand for over 180 days who bring foreign income into Thailand must pay tax, trading via foreign brokers offers a distinct advantage in terms of "Data Transparency."

Leading brokers typically have highly detailed Report or Statement systems. This allows you to retrieve historical data to clearly verify costs and profits. These documents serve as an excellent shield to confirm to the Revenue Department which portion of the transferred money is "Principal" (Tax-Free) and which portion is "Profit" (Taxable). Consequently, you do not need to pay tax on the entire amount transferred.

Trading with Foreign Brokers: Which Tax Category Do You Fall Into?

For trading CFDs or foreign assets, income is usually classified as assessable income under Section 40(4) (e.g., benefits derived from the transfer or trading of digital assets/derivatives), or in some cases, it may be classified under Section 40(8), which covers other types of income.

Filing Criteria: If you bring profits generated from trading back into Thailand within the tax year (or accumulated profits brought in later), you must include that profit amount as income for filing the P.N.D. 90 (ภ.ง.ด. 90) form during the beginning of the following year (January - March).

• Section 40(4) Category: This applies to filing for Cryptocurrencies and Digital Tokens (Section 40(4)(ch)), Foreign Stocks, Funds, and Bonds (Section 40(4)(b) or (d)). This also includes filing for CFDs, Forex, and Gold in cases where trading is a supplementary income—meaning the income is roughly equal to your main income, trading volume is not frequent, and you have not established a company or employed a specific team. Note: Filing under this category does not allow for expense deductions.
• Section 40(8) Category (Other Income): This applies to Professional Traders or those who trade as a primary occupation. Characteristics include hiring staff, renting an office, high trading volume, and frequent opening/closing of orders. You can file under this category and claim actual operating costs to deduct from the income. However, it is essential to prepare complete documentation, including receipts, tax invoices for utilities, and evidence of expenses related to trading. Filing under this category may carry a higher chance of being audited by the Revenue Department.
• Tax Exemption: If your net income in a tax year does not exceed the first 150,000 Baht, you will be exempt from tax according to the standard progressive tax rates.

How to Separate "Principal" and "Profit" for Correct Filing

This is the most critical part of tax management. The Revenue Department collects tax only on "Profit." The recommended practices are:

1. Separate the Principal: Suppose you transfer 100,000 Baht to trade (Cost). Later, the portfolio grows to 150,000 Baht, and you transfer the entire 150,000 Baht back to Thailand. The amount you must use for tax calculation is only the 50,000 Baht profit. The 100,000 Baht is simply bringing your principal home.
2. Choosing a Calculation Method: You can use the same approach as digital assets, such as First-In, First-Out (FIFO) or Moving Average Cost. You must keep Transaction History evidence from the broker to verify the amounts.
3. Fees (Commission/Spread): In CFD trading, these costs are usually already deducted from the profit/loss of each order. Therefore, the Net Profit figure in your Statement is typically the amount after these expenses have already been cleared.

Managing taxes from trading with foreign brokers might seem complex at first. However, if we understand the principle of "Imported Profit" and organize our Statements systematically, paying taxes becomes simple and helps us expand our investment portfolios sustainably.

Filing taxes correctly is not just about being a good citizen; it builds financial credibility for yourself when you need to conduct large transactions, such as applying for a home loan or proving the source of wealth in the future.

For traders already trading with XM: XM provides a summary of Transaction History, both daily and monthly, sent directly to your registered email. In case you require specific documents summarizing your Transaction History, you can also contact our Customer Support team for assistance.

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This content is provided for general informational purposes only and does not constitute tax, legal, or investment advice. Individuals should consult a qualified professional before making financial decisions. 

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