FIRPTA and the IRS: What US Buyers Get Wrong About Owning Property in Mexico

FIRPTA does not apply to US citizens buying Mexican real estate. FIRPTA is a US law that governs withholding when a buyer purchases US property from a foreign seller. When a US citizen buys property in Mexico, neither condition is met. What does apply: the US-Mexico income tax treaty, IRS reporting obligations for rental income and capital gains, and Mexican taxes withheld at the notario's closing table.

What is FIRPTA, and does it apply to buying property in Mexico?

FIRPTA (Foreign Investment in Real Property Tax Act) is a US law that requires a buyer to withhold a percentage of the purchase price and remit it to the IRS when purchasing US real estate from a foreign seller. The withholding applies to the transaction, not the buyer's nationality, and it applies only to US-sited property.

When a US citizen purchases property in the Riviera Maya, neither condition is present. You are not a foreign seller, and the property is not in the United States. FIRPTA has no application whatsoever to that transaction.

The confusion arises because buyers hear the word "foreign" and assume the law follows them abroad. It does not. FIRPTA is a jurisdictional rule about US real estate, not a rule about US citizens owning property overseas. Clearing up this misunderstanding early prevents buyers from either over-withholding on a Mexican purchase or, more commonly, assuming no US tax obligations exist at all.

Does the US-Mexico tax treaty protect buyers from paying taxes twice?

The United States and Mexico have had an active income tax treaty since 1992, and it directly benefits US buyers of Riviera Maya property. The treaty's core mechanism is a credit system, not an exemption. You do not pay both countries the full rate on the same income. Instead, you pay the higher of the two rates effectively once.

On capital gains, when you eventually sell and Mexico withholds ISR (impuesto sobre la renta) on the gain at closing, you claim a US foreign tax credit for that Mexican tax paid on IRS Form 1116. The net result is that you pay the higher of the two countries' applicable rates, not both stacked on top of each other.

Rental income works the same way. Mexico taxes Mexican-source rental income; you also report that income on your US return, then claim a foreign tax credit for the Mexican taxes already paid. A separate US-Mexico estate tax convention also exists for cross-border estate planning. The treaty is real protection, but it requires proper documentation to use.

What US tax obligations do I actually have as a US buyer in Mexico?

Owning Mexican property creates several distinct US reporting obligations that have nothing to do with FIRPTA. Rental income from a Mexican property is taxable in the US and must be reported on your federal return, with a foreign tax credit claimed for Mexican ISR paid. Capital gains on a future sale are reportable in the US, again with a credit for Mexican withholding.

Beyond income tax, US buyers may have FBAR (FinCEN 114) and FATCA (Form 8938) obligations if they hold financial accounts in Mexico above certain thresholds. These are disclosure requirements, not additional taxes, but the penalties for non-filing are significant.

Some US states also tax foreign-source income, which means your state return may require separate attention. The intersection of FIRPTA, FBAR, FATCA, the treaty, and state-level rules is precisely why our team consistently recommends engaging a US CPA with cross-border expertise before closing, not after.

How does Mexico tax US buyers on rental income from Riviera Maya property?

If you rent your Riviera Maya property, whether through a short-term platform or a long-term lease, Mexico has a direct claim on that income. As a non-resident of Mexico, which describes most US buyer-owners, you pay Mexican ISR on net rental income from Mexican property. Filing is done annually with SAT, Mexico's tax authority, and requires a RFC (Registro Federal de Contribuyentes), which is a Mexican tax ID.

Many foreign buyers operating short-term rentals are unaware that they need a RFC and a Mexican tax representative (representante fiscal) to file properly. Obtaining a RFC typically takes a few weeks and can be arranged through your Mexican closing attorney or a Mexican contador.

Rental income is also subject to IVA in Mexico. The rates and mechanics are best confirmed with a Mexican tax professional, as they depend on how the rental is structured. The key point is that rental income creates obligations in both countries, and the treaty's credit mechanism is what prevents you from paying both in full.

What happens with capital gains tax when I sell my Mexican property?

ISR on capital gains is the seller's tax in Mexico, not the buyer's. When you sell, the notario público who closes the transaction is legally required to calculate the ISR, withhold it directly from your sale proceeds, and remit it to SAT on your behalf. You receive your net amount after the tax has been taken out. There is no opt-out and no way to bypass this step.

The notary calculates the bill using two methods and applies whichever the law requires. Keeping the notary's official receipt of ISR withheld is essential, because that document is your proof of foreign tax paid when you claim the US foreign tax credit.

One persistent myth worth addressing directly: there is no five-year holding period that makes a gain tax-free in Mexico. That rule does not exist in Mexican law. The only gain exemption is the residency-based casa-habitación rule, which requires Mexican tax residency, a RFC, primary-residence proof, and meets a cap. It can be used only once every three years. If an agent tells you to wait five years and sell tax-free, that advice is incorrect.

What should US buyers do before closing to protect their tax position?

The steps that protect a US buyer's tax position are straightforward but time-sensitive. First, consult a US CPA with cross-border expertise before closing, not after. The pre-purchase consultation is the moment to structure ownership correctly, understand your reporting obligations, and plan for eventual rental income or a future sale.

Second, obtain a RFC before or immediately after purchase. It is required for any tax filings in Mexico, and the process typically takes a few weeks. Your Mexican closing attorney or a Mexican contador can assist.

Third, document your cost basis precisely at closing. Your basis includes the purchase price, closing costs such as notario fees and the ISAI acquisition tax, and any immediately capitalized improvements. A low or inaccurate declared purchase price on the deed is not a tax strategy. It is illegal, a reputable notario will refuse to do it, and it directly harms you by reducing your basis and increasing your taxable gain when you eventually sell.

If you are ready to review current Riviera Maya listings or want to speak with our team about the purchase process, we are glad to help you take the next step with full information in hand.