US-Mexico Tax Treaty Benefits for Cabo Property Owners: What Actually Saves You Money

The US-Mexico Income Tax Convention has been in force since 1994, and I'd estimate fewer than half the American property owners in Cabo I've worked with understand how it affects them. Most know they need to file US taxes on foreign rental income. Most know Mexico taxes their rental income and capital gains. What most don't know is exactly how the treaty prevents them from being taxed twice on the same dollar — and the specific mechanics that make the difference between a tax credit that zeros out your double exposure and one that doesn't.

Article 6: who gets to tax your rental income first

Article 6 of the US-Mexico tax treaty states that income from immovable property (real estate) may be taxed by the country where the property is located. For your Cabo condo, that means Mexico has the primary right to tax your rental income. This isn't a choice — Mexico will tax it regardless of the treaty. What the treaty does is establish the framework for preventing the US from also fully taxing that same income.

"May be taxed" in treaty language doesn't mean "might be taxed" — it means "has the right to tax." Mexico exercises that right through its Impuesto Sobre la Renta (ISR) system, either via a 25% withholding on gross rents for non-residents or through a Mexican tax return filing where you can claim deductions and pay at graduated rates.

Mexico's rental income withholding: 25% gross vs. net filing

Here's where most Cabo property owners leave money on the table. Mexico's default treatment is a 25% withholding on gross rental income with no deductions. If your Cabo condo generates $50,000 in gross rental income, Mexico takes $12,500 off the top — even if your actual expenses (HOA, property management, maintenance, predial taxes, insurance) total $20,000 and your net income is only $30,000.

The alternative: file a Mexican tax return through a fiscal representative and elect to be taxed on net income at graduated rates. For a net rental income of $30,000, the effective ISR rate is roughly 15-20% — which means you'd owe approximately $4,500-$6,000 instead of $12,500. That's a real savings of $6,000-$8,000 per year, and the foreign tax credit you claim on your US return is based on what you actually paid, so your US credit is lower but your total combined tax burden is lower too.

The catch: filing a Mexican tax return requires a Mexican RFC (tax ID), a fiscal representative, and proper bookkeeping of Mexican-source expenses. It's not free — budget $1,500-$3,000/year for a Mexican CPA who handles foreign property owners. But the savings on a property generating $50,000+ in rental income more than cover the cost.

Article 22: the foreign tax credit that prevents double taxation

Article 22 is the one that actually saves you money. It requires the US to credit taxes paid to Mexico against the US tax liability on the same income. The mechanism works through IRS Form 1116 (Foreign Tax Credit), which you file with your US return.

A practical example: you earn $50,000 in net rental income from your Palmilla condo. You file a Mexican return and pay $8,000 in ISR to Mexico. On your US return, you report the same $50,000 as foreign rental income on Schedule E. Your US tax on that income at a 24% marginal rate would be $12,000. But you claim an $8,000 foreign tax credit on Form 1116, reducing your US tax to $4,000. Total combined tax: $12,000 ($8K to Mexico + $4K to the US) — the same as if you'd only paid US tax.

The credit is limited to the US tax attributable to that foreign income — you can't use excess Mexican taxes to offset US tax on your domestic income. But in practice, because Mexico's effective rates on net rental income are usually lower than US marginal rates for property owners in the income brackets that buy Cabo real estate, the credit typically eliminates the entire US tax liability on that Mexican income.

Article 13: capital gains when you sell

When you sell your Cabo property, Mexico taxes the gain. You have two options under Mexican law:

• 25% of the gross sale price — simple but expensive. On a $1M sale, that's $250,000 in Mexican capital gains tax regardless of your basis or how long you held the property.
• 35% of the net gain — requires documenting your original purchase price (escritura), closing costs, improvements, and depreciation allowances. On a $1M sale of a property you bought for $600,000 with $50,000 in documented improvements, the net gain is $350,000, and the tax is $122,500.

The treaty again ensures you claim a foreign tax credit on your US return for the Mexican capital gains tax paid. Under US law, you report the gain on Schedule D and Form 8949, then credit the Mexican tax on Form 1116. If the Mexican tax exceeds your US tax on the same gain, the excess can be carried back one year or forward ten years under the foreign tax credit carryover rules.

For detailed guidance on structuring the sale itself, see our capital gains tax guide.

FBAR and FATCA: the reporting obligations the treaty doesn't waive

The tax treaty prevents double taxation, but it doesn't exempt you from US reporting requirements for foreign financial accounts. If your fideicomiso bank account or rental management account in Mexico holds more than $10,000 at any point during the year, you must file an FBAR (FinCEN Form 114). If you meet the FATCA threshold ($50,000+ in foreign financial assets for domestic filers, $200,000+ for those living abroad), you also file Form 8938.

These are reporting forms, not tax forms — they don't create additional tax liability. But the penalties for non-filing are severe: up to $10,000 per violation for non-willful FBAR failures and up to $100,000 or 50% of the account balance for willful violations. For a complete breakdown, see our FBAR and FATCA guide.

Common mistakes that cost Cabo property owners money

• Not filing Form 1116: The foreign tax credit doesn't appear automatically on your US return. You must actively claim it. Every year I hear from an owner who's been paying taxes to both countries without claiming the credit — sometimes for years.
• Paying 25% gross in Mexico when net filing would save thousands: The default withholding is convenient but almost always more expensive than filing a Mexican return on net income.
• Poor expense documentation: Mexico requires proper facturas (official invoices) for deductible expenses. Informal receipts or cash payments without documentation can't be deducted on your Mexican return, which inflates your taxable income and your Mexican tax — which in turn inflates the credit but also inflates your total tax burden.
• Ignoring the RFC requirement: Your Mexican tax ID (Registro Federal de Contribuyentes) is required for filing a Mexican return, and obtaining one takes time. Start the process when you buy the property, not when you file your first return.
• Mismatching tax years: Mexico's tax year is the calendar year, same as the US. But filing deadlines differ — Mexico's annual return is due in April, and the US deadline is also April 15 (with automatic extensions available). Coordinate both filings to ensure the credit amounts match.

A note for Canadian property owners

Canada has its own tax treaty with Mexico (the Canada-Mexico Income Tax Convention), and the mechanics are similar — foreign tax credits prevent double taxation on rental income and capital gains. Canadian owners file Form T2209 (Federal Foreign Tax Credits) with their Canadian return. The key difference is that Canada taxes worldwide income at higher marginal rates than the US, so the foreign tax credit for Mexican taxes paid is almost always fully absorbed within the Canadian tax calculation. For a full breakdown, see our Canadian buyers guide.