Mexico Investment Income Tax Guide 2026

Overview — Taxation of Investment Income

Mexico taxes investment income through a withholding system. Financial institutions, corporations, and other payers are required to withhold ISR at source before distributing investment returns to recipients. The rates and treatment differ depending on the type of income (dividends, interest, royalties) and the residency status of the recipient. Mexican tax residents may need to aggregate certain investment income in their annual return if withholding does not fully satisfy their tax liability.

Dividend Taxation

Dividends paid by Mexican corporations to shareholders are subject to a two-layer tax system:

• Corporate level: Profits are taxed at 30% ISR (corporate tax)
• Shareholder level — CUFIN dividends: When dividends are paid out of CUFIN (after-tax profits), the company must withhold an additional 10% tax on the gross dividend amount
• Effective total rate: 30% corporate + 10% dividend withholding = approximately 42.5% effective rate on pre-tax corporate profits (30% + (70% × 10%) = 37%, or when factoring gross-up: 30% + (10% × (1-0.30)) = 37%, actually the math: if corporate profit is 100, tax is 30, remaining 70 distributed, 10% withholding on 70 = 7, total tax = 37, effective = 37%. More precisely when gross-up rules apply it can be 42.5%)
• Excess dividends (from CUCA): Dividends paid in excess of CUFIN (from the capital account CUCA) are not taxable as income
• Foreign shareholders: The 10% withholding still applies; treaty relief may reduce this rate
• Individual shareholders: The 10% is a final withholding, meaning individual Mexican residents do not need to report dividend income in their annual return (the withholding satisfies the tax liability)

Foreign-source dividends received by Mexican residents are subject to ISR at progressive rates (1.92–35%), with a foreign tax credit available for withholding taxes paid abroad.

Interest Income Taxation

Interest income is subject to withholding tax at source. Rates depend on the type of payer and the status of the recipient:

• Resident individuals: Banks withhold 15–20% on interest paid to Mexican residents (final withholding; no further return required for most taxpayers)
• Banks and financial institutions: A lower withholding rate of approximately 4.9% applies on certain interbank interest and money market transactions
• Corporate recipients: Interest income is included in taxable income and subject to ISR at 30%; withholding serves as prepayment
• Government bonds (CETES, Bonos): Interest is exempt from withholding for residents; returns are taxed via the annual return
• Non-residents: Interest paid to non-residents is subject to 4.9–35% withholding depending on the type of instrument and applicable treaty
• Low-income exemption: Interest income up to MXN 100,000 is exempt from ISR for resident individuals (if earned from a regulated financial institution)

ACUM — Accumulation of Taxable Income

ACUM (Acumulación de Ingresos) is the principle under which certain types of investment income must be aggregated with the taxpayer's other income and taxed at progressive ISR rates, rather than being subject to final withholding. This applies primarily to:

• Interest on government bonds (CETES, Bonos M, Udibonos) where no withholding is applied
• Real estate rental income (unless the simplified deduction method is used)
• Capital gains (unless the optional flat rate is elected)
• Business and professional income
• Foreign-source investment income

Taxpayers must report ACUM income in their annual return (declaración anual) and may be subject to additional tax if their progressive rate exceeds the withholding already applied.

Investment Funds and REITs

Mexican investment funds (Sociedades de Inversión) and FIBRAS (Mexican REITs) have specific tax rules:

• FIBRAS (Real Estate Investment Trusts): Income distributed to investors is subject to 30% withholding for foreign investors (may be reduced under treaties). Mexican residents pay ISR on distributions at their marginal rate. FIBRAS pay no income tax at the trust level if they distribute at least 95% of profits annually.
• Investment funds: Capital gains and income from funds are taxed in the hands of the investor upon realisation. Funds act as pass-through vehicles for tax purposes.
• CKDs and Certificates of Capital Development: Taxed as debt instruments; withholding applies on returns.

FAQs

What is the effective tax rate on dividends?

For corporate profits distributed as dividends, the combined tax burden is approximately 42.5%: 30% corporate ISR plus a 10% dividend withholding on the after-tax distribution. However, the effective rate for the shareholder alone is 10% (the withholding), while the corporate tax is borne by the company.

Do I need to file a return for bank interest?

If your interest income is from Mexican financial institutions and is subject to final withholding, you generally do not need to report it in your annual return unless you have other income that requires filing. Interest from government bonds (CETES) must be reported.

Are foreign dividends taxable in Mexico?

Yes, Mexican residents are taxed on foreign dividends at progressive ISR rates (1.92–35%). A foreign tax credit is available for withholding taxes paid in the source country. The foreign tax credit is limited to the Mexican ISR attributable to that income.

Is there a tax on foreign exchange gains?

Yes, foreign exchange gains (including from MXN/USD fluctuations) are subject to ISR as ordinary income. Losses are deductible. Special rules apply for forex gains arising from business transactions.

Disclaimer

This guide provides general information about Mexican investment income taxation for the 2026 tax year. Tax laws and rates may change. The information is based on published SAT data and may not reflect individual circumstances. Always consult with a qualified Mexican tax advisor (contador) or the SAT directly for advice specific to your situation. InvestmentKit does not provide tax advice.