Capital Gains Tax in Mexico —
What Most Buyers Never Plan For

Almost no one discusses capital gains tax when buying property in Cabo San Lucas. The transaction is focused on getting to closing. Capital gains is a selling problem — one most buyers and sellers don't think about until years later, when records have not been kept and planning has not been done.

Plan for it now. It is significant.

The Basic Structure

When you sell property in Mexico, the gain is subject to income tax. The notario is required by law to withhold estimated capital gains tax at closing. The rate varies based on how the gain is calculated, but effective rates for non-resident foreign sellers often land in the range of 25% to 35% of the net gain.

This is not a small number. On a property that has appreciated from $350,000 to $550,000 — a $200,000 gain — you may owe $50,000 to $70,000 in Mexican capital gains tax. That is before any home-country tax obligation.

The Exemption Most Buyers Hear About

Mexico allows a capital gains exemption for primary residences. The exemption can shield up to 700,000 UDIs (a Mexican inflation-indexed unit — currently roughly $4 million USD) of gain from tax. This sounds like it solves the problem.

For most foreign buyers in Cabo, it does not. The exemption requires Mexican residency (FM2 or permanent resident status), and it requires that the property has been your primary residence for at least two years. It also requires that you have a CFE electric bill in your name at that address, a tax ID (RFC) registered there, and that you have not claimed the exemption in the last three years.

The Peso Problem

Here is the part almost nobody explains at the time of purchase. Capital gains in Mexico are calculated in pesos, not dollars. You purchase at $400,000 USD. Three years later you sell at $500,000 USD. Straightforward gain of $100,000 USD, right?

Not exactly. Your purchase price is converted to pesos at the exchange rate on the day of purchase. Your sale price is converted to pesos at the exchange rate on the day of sale. The peso has historically depreciated against the dollar over time. This means your purchase cost basis in pesos looks smaller relative to your sale price in pesos — and your taxable gain in pesos can be larger than your actual gain in dollars.

In practical terms: the peso depreciation effect means you can owe Mexican capital gains tax even in years when you did not appreciate much in dollar terms, simply because the exchange rate moved.

What You Can Do

Document all improvements. Capital improvements to the property — renovations, major appliances, structural work — increase your cost basis and reduce the taxable gain. Keep every receipt, in pesos, dated at time of payment. Your attorney will need this at closing.

Obtain Mexican residency if you plan to hold long-term. If you plan to own the property for many years and may eventually use it as a primary residence, starting the residency process early matters. The two-year clock on the primary residence exemption does not start until you have residency status.

Get a cross-border accountant involved before you buy. Someone who works with both Mexican and your home-country tax obligations. They can help you structure the purchase, track costs, and plan the exit. The cost is modest. The savings can be significant.

Factor it into your return calculations. A property generating 7% annual returns that faces a $60,000 exit tax bill looks different than one where that liability is planned for. Know your numbers before you go in.