Selling Property in Mexico: Withholding Tax for Nonresidents

When a nonresident sells property in Mexico, the notary withholds capital gains tax (ISR) directly at closing, generally either a flat 25% of the gross sale price or roughly 35% on the net gain, whichever method applies to your situation. The tax is collected before you receive your proceeds, so planning ahead is essential. This article explains the two methods and how to keep the bill as low as legally possible.

The two withholding methods

Mexico gives nonresident sellers a structured choice, applied by the notary:

• 25% of the gross sale price. Simple, with no deductions. Often better when your gain is large relative to the sale price.
• ~35% of the net gain. The gain is sale price minus documented cost basis (acquisition cost, taxes paid, and notarized improvements). Often better when your gain is modest or your basis is well documented.

The notary calculates both where applicable and helps you apply the method that legally minimizes your tax, provided you have the documentation to support a net-gain calculation.

Why documentation decides your bill

The single biggest lever is your cost basis. Every peso you can document at purchase, the sale price on your deed, the ISABI and notary fees you paid, and any improvements invoiced with proper facturas, reduces the net gain and therefore the tax under the 35% method. Buyers who keep clean records often pay dramatically less than those who cannot prove their basis. This is why we always advise buyers at Panorama by Viento to archive every official receipt from day one.

Residency and exemptions

In limited cases, a seller who is a Mexican tax resident and meets primary-residence conditions may qualify for an exemption on part or all of the gain. Most U.S.-based nonresident owners will not meet those residency tests and should plan for withholding. Your notary and a cross-border accountant can confirm your status before you list. Do not assume an exemption applies; confirm it in writing.

A simplified example

Suppose you bought a residence for around half a million USD and sell years later for $520,000 USD:

• Gross method: 25% of $520,000 = about $130,000 USD withheld.
• Net method: gain of $130,000 minus documented basis and improvements, taxed at roughly 35%. If documented costs reduce the gain to $100,000, the tax is about $35,000 USD.

The figures are illustrative and converted at the official rate, but they show why documentation can swing the outcome by tens of thousands of dollars. Your notary runs the exact numbers in pesos.

Don't forget the U.S. side

As a U.S. citizen or resident, you also report the sale on your U.S. return, where worldwide income is taxable. The good news: you can generally claim a foreign tax credit for the Mexican ISR you paid, reducing or eliminating double taxation. Coordinating the Mexican withholding with your U.S. filing is a job for a cross-border CPA, and it is worth the fee. We cover the investment fundamentals that make this planning smoother.

How to prepare before you sell

• Locate your original deed, ISABI receipt, and notary invoices.
• Gather facturas for any improvements you made.
• Confirm your tax residency status in writing.
• Engage a notary and cross-border accountant early, before you sign a sale contract.

Selling in Mexico is straightforward when you plan for the withholding rather than being surprised by it. The notary handles the mechanics; your job is to arrive with documentation that supports the lowest legal method.

Thinking about buying with the eventual sale in mind?

Smart buyers plan their exit on day one. We can show you how clean documentation on a new residence protects your future net proceeds. Message us on WhatsApp or use the contact form to schedule a private visit in El Sauzal.