Selling Your Mexican Home as a Non-Resident: The 25 vs 35 Percent Trap

The short version

If you sell Mexican real estate while you are treated as a nonresident of Mexico, the number that gets repeated online is 25 percent.

That number is real, but it is dangerous when it is read too quickly.

Article 160 of Mexico’s Income Tax Law says that, for a foreign resident selling real estate located in Mexico, the tax is generally determined by applying 25 percent to the total income obtained, with no deduction. In plain English, that is a tax on gross proceeds, not on gain.

The same article also gives a different path for certain sales. If the transaction satisfies Article 160’s representative, public-deed, or certificate mechanics, the notary or other authorized closing official may be able to compute the sale under the Article 152 gain framework instead of the 25 percent gross-price rule. That is where the common “35 percent” shorthand comes from, because the 2026 Article 152 tariff published by SAT uses a 35 percent top marginal rate.

The trap is not that 25 percent is always worse or that 35 percent is always better. The trap is that the denominator changes. Twenty-five percent applies to the sale price with no deductions. The Article 160 net-gain option starts with gain and requires a better file.

What Mexican law says

The controlling source is Article 160 of Mexico’s Income Tax Law.

Article 160 treats income from selling real estate as Mexican-source income when the property is located in Mexico. That matters for a U.S. seller who is not a Mexican tax resident. Even if the seller lives in the United States, the Mexican property location gives Mexico a source rule for the sale.

For real estate sales by foreign residents, Article 160 says the tax is determined by applying 25 percent to the total income obtained, without any deduction. If the buyer is a Mexican resident or a foreign resident with a permanent establishment in Mexico, the buyer withholds and pays the tax. In other cases, the taxpayer must pay by return within 15 days after receiving the income.

That is the gross-proceeds rule.

Article 160 then gives an alternative for taxpayers who have representatives in Mexico that meet Article 174 requirements, when the sale is recorded in a public deed, or when the transaction involves certain non-amortizable real estate participation certificates. In that situation, the closing file may support applying the maximum rate under Article 152 to the gain determined under the Mexican individual real-estate gain rules. Article 160 also says that public-deed real-estate sales do not require a representative in Mexico to exercise that option.

The statute also puts responsibility on the closing gatekeeper. When the sale is recorded in a public deed, notaries, judges, commercial brokers, and other public officials with notarial functions calculate the tax under their responsibility, state it in the deed, and remit it within 15 days after the deed is signed.

That is why this is not a casual closing-day election by the seller alone. The seller needs the file, any required representative mechanics, and the notary-ready calculation before the notary appointment. A Mexican lawyer or notary should confirm whether the Article 174 representative requirements are satisfied.

Why the 25 percent number is dangerous

The 25 percent rule is simple because it ignores basis.

That simplicity is the problem.

If a nonresident sells Mexican real estate for $500,000, a 25 percent tax on gross proceeds is $125,000 before any exchange-rate, filing, treaty, or local-document details are considered. The calculation does not ask what the seller paid for the property, what improvements were made, what commissions were paid, or what the actual gain is.

For a seller with low basis, that might be close enough to the economics. For a seller with high basis, major improvements, selling costs, or a thin gain, it can be punitive.

That is why the first question is not “is Mexico taking 25 percent?” The first question is: are you stuck in the gross-proceeds lane, or can you document the net-gain lane?

The 35 percent shorthand

The second number, 35 percent, is also easy to misunderstand.

Article 160 does not say that every nonresident seller can simply pay 35 percent of the gain. It refers to the maximum Article 152 rate applied in the net-gain framework. SAT’s Anexo 8 for the 2026 Miscellaneous Tax Resolution publishes the Article 152 annual tariff for 2026, and the top bracket shows a 35 percent rate on the excess over the lower limit.

That is why practitioners often summarize the option as “25 percent of gross or up to 35 percent of gain.”

That shorthand is useful, but only if the seller remembers the conditions:

the sale must fit the Article 160 option;
the seller needs a Mexican representative when required;
the transaction and notarial file must support the gain calculation;
deductions and basis need documentary support;
the notary or other public official must have the information in time to calculate and remit the correct tax.

The better file can produce a better result. The label alone cannot.

A simple illustration

Assume a U.S. seller is a foreign resident for Mexican tax purposes and sells Mexican real estate for $500,000. Assume the seller has $420,000 of documented basis, capital improvements, and selling costs. The simplified economic gain is $80,000.

This is not a Mexican tax computation. It is a denominator illustration.

Lane	Simplified base	Rate shorthand	Simple illustration	Why the file matters
Gross-proceeds lane	$500,000 sale price	25 percent	$125,000	Article 160 applies 25 percent to total income obtained, without deduction.
Net-gain lane	$80,000 simplified gain	Article 152 maximum-rate shorthand, top rate 35 percent	Up to $28,000 before full tariff mechanics	Article 160’s option uses gain and the Article 152 maximum rate framework, but only if the statutory and documentary conditions are satisfied.

That table is why the phrase “25 vs 35” can mislead people. The lower rate can produce the higher tax because it applies to the bigger base. The higher rate can produce the lower tax because it starts from gain.

But do not overcorrect. The net-gain lane is not automatic. If the seller cannot document cost, improvements, deductions, any required representative authority, exchange-rate support, and the notary file, the theory may not survive closing.

The file you need before closing

For a U.S. seller, the Mexican file should start before the listing goes live.

At minimum, the seller should organize:

deed and acquisition documents;
proof of purchase price and closing costs;
invoices and support for capital improvements;
selling-cost support, including broker and legal fees where applicable;
property-tax and local-payment records;
identification and tax records requested by the notary;
representative authority if the Article 160 option requires it;
exchange-rate support for U.S. tax basis and U.S. return reporting;
the draft notarial computation before signing;
proof of Mexican tax withheld or paid.

The most expensive version of this problem is trying to reconstruct the file after the closing office has already treated the transaction as a gross-proceeds sale.

What the notary does and does not fix

The Mexican notary or other authorized public official is central to the sale, but that does not mean the notary is your U.S. tax adviser.

Article 160 assigns tax-calculation and payment responsibilities to notaries and similar public officials when the sale is recorded in a public deed. That is a Mexican compliance function tied to the deed, the tax calculation, and the payment deadline.

It does not answer the U.S. return by itself.

The notary may calculate Mexican tax. The U.S. return still needs sale date, amount realized, adjusted basis, currency translation, home-sale exclusion review if the property was a main home, foreign tax credit analysis, and state-residence consequences. The exchange-rate method should be confirmed with the U.S. preparer rather than reconstructed from whatever rate appears on a closing worksheet.

That is why the seller should ask for the computation and payment proof in a form the U.S. preparer can actually use.

The U.S. side does not disappear

A U.S. citizen or resident alien does not escape U.S. reporting just because the property is in Mexico. The IRS states that U.S. citizens and resident aliens abroad are generally subject to the same filing rules whether in the United States or abroad and are subject to U.S. tax on worldwide income from all sources.

If the Mexican property was the seller’s main home, IRC Section 121 and IRS Publication 523 become relevant. Publication 523 explains the home-sale exclusion rules, including the possible exclusion of up to $250,000 of gain, or up to $500,000 for certain married taxpayers filing jointly, when the taxpayer meets the requirements.

That is not a blanket exclusion. The seller has to test ownership, use, timing, prior exclusion use, and reporting rules. Foreign property can still create U.S. basis, currency, and reporting issues.

If Mexico withheld or collected tax on the sale, the U.S. foreign tax credit analysis is also separate. IRC Section 901, IRS Publication 514, and the Form 1116 instructions are the U.S. side of that file. The IRS foreign tax credit guidance says taxpayers who paid or accrued foreign taxes to a foreign country and are subject to U.S. tax on the same income may be able to take a credit or an itemized deduction, and that individual taxpayers generally use Form 1116 for certain foreign taxes.

The credit is subject to limitation, sourcing, and rate-basket rules that must be analyzed separately for each transaction. The creditable amount is not always the amount withheld. Foreign taxes on capital gain can also require treaty review, including the U.S.-Mexico income tax treaty, before the U.S. return position is locked.

What can go wrong

The common failure pattern looks like this:

the seller assumes Mexico taxes only the gain;
the seller shows up with a U.S. closing statement but not Mexican invoices or notary-ready support;
the notarial file defaults to the 25 percent gross-proceeds lane;
the seller receives Mexican withholding or payment proof after the fact;
the U.S. preparer is asked to fix the foreign tax credit later;
the U.S. return has to reconcile sale proceeds, basis, exchange rates, possible home-sale exclusion, and foreign taxes from an incomplete file.

That is backwards.

The closing file should be built for both countries before the deed is signed. The Mexican side needs to know whether the gross or net-gain lane is supportable. The U.S. side needs to know how the sale will be reported, whether section 121 may apply, and how any Mexican tax may fit into the foreign tax credit calculation.

What this means for you

If you are a U.S. person selling Mexican real estate as a nonresident of Mexico, do not treat “25 percent” as a closing cost estimate.

Treat it as a warning.

The gross-proceeds rule can be expensive. The net-gain option can be better, but it has to be earned with documents, any required representative mechanics, and a notary-ready calculation. The U.S. return then has its own job: worldwide-income reporting, possible home-sale exclusion, basis and currency work, and foreign tax credit review.

The practical move is to build a two-country sale file:

Mexico closing file: Article 160 lane, notary computation, any required representative authority, basis and deduction support, Mexican tax payment proof.
U.S. return file: amount realized, adjusted basis, exchange rates, main-home exclusion review, foreign tax credit support, state-residence evidence.

The wrong time to discover the difference between 25 percent of gross and the Article 152 net-gain option is after the buyer, notary, and tax payment have already moved on.

How Sheepdog Tax can help

I am Noah Green, a CPA and Certified Fraud Examiner, and Sheepdog Tax is a veteran-owned practice. I help U.S. taxpayers with foreign work, digital assets, and cross-border filing facts build the tax file before the return locks in the position. For a Mexico real-estate sale, that means coordinating the Mexican closing tax file, U.S. sale reporting, basis and exchange-rate support, possible home-sale exclusion, foreign tax credit analysis, and local-counsel handoff before closing-day paperwork becomes the only record. To request a Mexico expat tax diagnostic, reach me at noah@sheepdogtax.com.

Sources (official source first)

Orden Jurídico Nacional, Mexico Income Tax Law PDF, Article 160 and Article 152. http://www.ordenjuridico.gob.mx/Documentos/Federal/pdf/wo25.pdf
SAT, Anexo 8, Resolución Miscelánea Fiscal para 2026, Article 152 tariff for 2026. https://www.sat.gob.mx/minisitio/NormatividadRMFyRGCE/documentos2026/rmf/anexos/Anexo-8-RMF-2026_DOF-28122025.pdf
Internal Revenue Code Section 121, exclusion of gain from sale of principal residence. https://www.law.cornell.edu/uscode/text/26/121
IRS, Publication 523, Selling Your Home. https://www.irs.gov/publications/p523
Internal Revenue Code Section 901, taxes of foreign countries and possessions of the United States. https://www.law.cornell.edu/uscode/text/26/901
IRS, Publication 514, Foreign Tax Credit for Individuals. https://www.irs.gov/publications/p514
IRS, Instructions for Form 1116. https://www.irs.gov/instructions/i1116
IRS, Foreign Tax Credit. https://www.irs.gov/individuals/international-taxpayers/foreign-tax-credit
IRS, U.S. Citizens and Resident Aliens Abroad. https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-resident-aliens-abroad

Prepared by Noah Green, CPA, CFE.