Mongolia Cross-Border Tax Guide 2026

Overview — Cross-Border Taxation in Mongolia

Mongolia's cross-border tax rules are governed by the General Taxation Law, the Transfer Pricing Law, and various double tax treaties. The Mongolian Tax Authority (MTA) has been strengthening its international tax capacity, including participation in the OECD's Base Erosion and Profit Shifting (BEPS) Inclusive Framework. Multinational enterprises operating in Mongolia must comply with transfer pricing documentation requirements, thin capitalisation rules, and withholding tax obligations. Non-residents earning Mongolia-source income are generally subject to withholding taxes at statutory rates, which may be reduced under applicable treaties.

Transfer Pricing — OECD Guidelines

Mongolia's transfer pricing rules follow the OECD Transfer Pricing Guidelines. The regulations require that transactions between related parties be priced at arm's length. Related parties include companies under common control, parent-subsidiary relationships, and individuals with significant influence. Documentation requirements include a master file, local file, and country-by-country reporting (for groups with consolidated revenue exceeding the threshold). Acceptable transfer pricing methods include the Comparable Uncontrolled Price (CUP) method, Cost Plus method, Resale Price method, Transactional Net Margin Method (TNMM), and Profit Split method. Advance Pricing Agreements (APAs) are available for qualifying taxpayers. Penalties for non-compliance range from 20% to 100% of the tax adjustment plus interest.

Thin Capitalisation — 3:1 Debt-to-Equity

Mongolia's thin capitalisation rules limit the amount of interest that a company can deduct on related-party debt. The maximum allowable debt-to-equity ratio is 3:1 (debt exceeding equity by no more than 3 times). Interest on debt exceeding this ratio is disallowed as a deduction and may be treated as a dividend for withholding tax purposes. The rules apply to all related-party debt, including loans from foreign parent companies, sister companies, and guaranteed third-party debt. Certain long-term financing from approved financial institutions may be exempt.

Withholding Taxes to Non-Residents

Payments to non-residents from Mongolia-source income are subject to withholding tax at the following standard rates (treaty rates may apply):

• Dividends — 10% (reduced to 5-8% under most DTTs)
• Interest — 10% (reduced to 7-10% under DTTs)
• Royalties — 10-20% (reduced to 5-10% under DTTs)
• Management & technical fees — 20%
• Rent (commercial property) — 10%

The person making the payment must withhold the tax and remit it to MTA within 10 days. A withholding tax certificate must be issued to the non-resident. Treaty relief requires the non-resident to provide a Certificate of Tax Residency.

Controlled Foreign Company (CFC) Rules

Mongolia's CFC rules attribute certain passive income of a foreign company to its Mongolian resident shareholders where the foreign company is controlled by Mongolian residents. A foreign company is a CFC if Mongolian residents hold more than 50% of the shares, voting rights, or entitlements to profits. The attributed income includes dividends, interest, royalties, rent, and capital gains of the CFC. Active business income of the CFC is not attributed. The Mongolian shareholder reports their proportionate share of the CFC's passive income in their annual tax return.

Double Tax Treaties — Practical Application

Mongolia has over 40 double tax treaties. To claim treaty benefits, a non-resident must:

• Obtain a Certificate of Tax Residency from the home country tax authority
• Submit a Treaty Relief Application to MTA
• Provide the certificate and application to the Mongolian withholding agent
• Wait for MTA approval (typically 2-4 weeks)

Treaty benefits include reduced withholding tax rates and potential exemption from CGT on certain assets. The Mongolia-China treaty is particularly important given the dominance of Chinese investment in Mongolia's mining sector. The Limitation on Benefits (LOB) clauses in newer treaties restrict treaty access to genuine residents with substantial business activity in their home country.

FAQs

Do I need to register for tax in Mongolia as a non-resident investor?

Non-residents earning Mongolia-source income (e.g., dividends, interest, rent) generally do not need to register for tax if the income is subject to final withholding tax. However, a non-resident with a permanent establishment in Mongolia must register and file corporate tax returns.

How do I claim a refund of excess WHT?

A non-resident may claim a refund if WHT was deducted at the full statutory rate when a reduced treaty rate should have applied. The refund claim is submitted to MTA with supporting documents including the treaty relief application and proof of residency.

Does Mongolia have a General Anti-Avoidance Rule (GAAR)?

Yes, the General Taxation Law includes a GAAR that allows MTA to recharacterise transactions entered into for tax avoidance purposes.

Disclaimer

This guide provides general information about Mongolian cross-border taxation for the 2026 tax year. Tax laws and treaty provisions may change. Always consult with a qualified Mongolian international tax advisor or the Mongolian Tax Authority for advice specific to your situation. InvestmentKit does not provide tax advice.