How to Reduce Capital Gains Tax When Selling Property in Mexico

How to Reduce Capital Gains Tax (ISR) When Selling Property in Mexico

Selling real estate in Mexico comes with a tax obligation most foreign sellers don't fully anticipate and often overpay. ISR (Impuesto Sobre la Renta) can reach up to 35% of your capital gain, but with the right documentation and legal strategy in place before closing, that number can be significantly reduced, or eliminated entirely.

Here's what you need to know.

What Is ISR and When Does It Apply?

When you sell real estate in Mexico, the notary is legally required to calculate and withhold ISR at closing. The tax is applied to your capital gain, the difference between your declared sale price and your fiscal acquisition cost.

The critical word here is "fiscal." Your taxable gain is not simply the market appreciation of your property. It depends on how your cost basis is documented, updated, and structured, which is exactly where most sellers leave money on the table.

Legal Deductions That Reduce Your Tax Burden

Mexican tax law allows sellers to deduct the following costs from their taxable gain, provided they are supported by valid tax invoices (CFDIs) and proper documentation:

• Original purchase price

• Closing costs and notary fees paid at acquisition

• Real estate agent commissions

• Documented improvements and renovations, kitchen remodels, expansions, structural work

One thing sellers consistently overlook: improvements without CFDI invoices cannot be deducted. If your contractor was paid in cash with no fiscal receipt, that investment is invisible to the tax authorities — and you pay tax on it anyway.

Practical tip: Keep before-and-after photos of any upgrades and ensure every contractor provides a CFDI invoice issued to your name with the property address. Do this before the work begins, not after.

Can I Be Fully Exempt from ISR?

Yes, under Article 93, Section XIX of Mexico's Income Tax Law, you may qualify for a full exemption on gains up to 700,000 UDIS (approximately $315,000 USD as of 2025) if all of the following apply:

• The property is your primary residence

• You can demonstrate residency with official documentation (utility bills, voter ID, CFDIs issued at that address)

• You have not applied this exemption in the previous three years

The exemption does not apply automatically. It must be claimed at closing, with proper documentation presented to the notary in advance.

Do Foreigners Pay Capital Gains Tax in Mexico?

Yes. Foreign nationals are subject to ISR on Mexican real estate sales regardless of where they reside. However, the same deductions and exemptions available to Mexican nationals apply, and in some cases, tax treaty provisions between Mexico and the seller's home country may offer additional planning opportunities.

What matters most for foreign sellers is having an updated cost basis, complete acquisition documentation, and a clear understanding of how the transaction will be structured before the closing date.

The Notary Calculates Your Tax. We Protect Your Interests.

This is one of the most misunderstood aspects of selling property in Mexico. The notary's job is to formalize the transaction and withhold the correct amount of tax on behalf of the government. They do not represent you, and they are not obligated to identify every deduction or exemption you may be entitled to.

That's where legal representation makes a real difference.

At Cabo Closing Services, we review your acquisition documents, identify every applicable deduction, confirm whether you qualify for the primary residence exemption, and coordinate directly with the notary to ensure your ISR calculation reflects your actual legal position, not just the default withholding.

Selling Property in Los Cabos? Let's Talk Before You Sign.

The decisions that affect your tax liability are made before closing, not at the table. If you're planning to sell in Los Cabos, San José del Cabo, or anywhere in Baja California Sur, contact us for a consultation before the process begins.

Schedule at caboclosingservices.com or reach us at [email protected]