Capital Gains Tax on Mexico Property — Guide for US and Canadian Sellers

Non-resident sellers in Mexico face a default 25% tax on the gross sale price — but electing the net-gain method with proper documentation can cut that bill by 50% or more through inflation indexing and deductions.

1. How Mexico Taxes Property Gains

When you sell real property in Mexico, the gain is subject to the Impuesto Sobre la Renta (ISR) — Mexico's income tax. The tax is administered by the Servicio de Administracion Tributaria (SAT), Mexico's federal tax authority.

The ISR on real estate is not a flat rate. Mexico uses a progressive bracket system that applies escalating rates to your net taxable gain — the difference between your inflation-adjusted cost basis and the sale price, after all allowable deductions. This is the same rate structure that applies to Mexican income tax generally.

For non-resident sellers (most Americans and Canadians), there are two options at closing:

1. Default withholding: 25% of the gross sale price. No deductions, no inflation adjustment. The notario applies this automatically unless the seller has arranged the alternative.
2. Net-gain election: 35% on the net taxable gain after deductions and inflation indexing. This requires an RFC (Mexican tax ID number), documented facturas for improvements, and coordination with the notario before closing day. Despite the higher marginal rate, this method almost always produces a lower tax bill for properties held more than a few years.

Mexican tax residents who file annual returns use the progressive bracket system (1.92% to 35%) and can access the primary residence exemption. The critical takeaway for foreign sellers: obtain an RFC and elect the net-gain method. The 25% gross default is a blunt instrument that ignores your cost basis entirely.

2. ISR Rate Tiers — Residents vs Non-Residents

The tax calculation differs depending on your residency status. Mexican tax residents use the progressive bracket system. Non-residents who elect the net-gain method pay a flat 35% on the calculated gain. Here is how each path works:

Seller Status	Default Method	Alternative Method	Best For
Non-resident (no RFC)	25% of gross sale price	N/A — must obtain RFC first	Quick sales, no documentation
Non-resident (with RFC)	25% of gross sale price	35% on net gain after deductions	Long-held properties with deductions
Mexican tax resident	Progressive rates (1.92%–35%) on net gain	Primary residence exemption available	Full-time residents with RFC

For non-residents who elect the net-gain method, the math is straightforward: the notario calculates the net taxable gain (sale price minus inflation-adjusted cost basis minus all deductions), then applies 35% to that figure. Despite the higher rate, this almost always produces a lower tax than 25% of the gross sale price.

Example: a property that sells for $1M USD, purchased for $500K USD (which inflates to $725K after UDIS adjustment), with $50K in deductible improvements and $60K in commissions. Net taxable gain: $165K. At 35%, the tax is approximately $57,750. Under the default 25%-of-gross method, the tax would be $250,000 — more than four times higher.

3. Deductible Costs That Reduce Your Tax

The ISR calculation allows several deductions that reduce your taxable gain. Maximizing these deductions is the single most effective legal strategy for lowering your tax bill. Every deduction must be supported by facturas (official Mexican tax invoices) or notarial records.

Allowable deductions include:

• Original purchase price — inflation-adjusted via UDIS or INPC from the purchase date to the sale date
• Acquisition costs — notario fees, fideicomiso setup, acquisition tax (ISAI), title insurance, and legal fees paid at the time of purchase
• Documented improvements — construction, remodeling, additions, and structural upgrades supported by facturas (also inflation-adjusted)
• Sales commissions — the real estate agent's commission on the sale (typically 5-6% of the sale price)
• Selling costs — notario fees, certificate fees, and closing costs incurred on the sale side

The most commonly missed deduction is improvements. Many foreign owners pay contractors in cash without requesting facturas, which makes those expenditures invisible to the notario at sale time. This is an expensive mistake. For more on closing costs in Mexico, see our dedicated guide.

UDIS Inflation Indexing — How It Works

UDIS (Unidades de Inversion) are inflation-indexed units published daily by the Banco de Mexico. They track cumulative inflation since their creation in 1995. The notario uses UDIS to adjust your original cost basis for inflation, which increases the deductible amount and reduces your taxable gain.

Here is a simplified example:

• You purchased a condo for $500,000 USD in 2018
• Cumulative Mexican inflation (INPC) from 2018 to 2026 is approximately 45%
• Your inflation-adjusted cost basis becomes approximately $725,000 USD
• If you sell for $900,000 USD, your taxable gain is $175,000 — not $400,000

This adjustment alone reduced the taxable gain by more than half in this example. The longer you hold the property, the larger the inflation adjustment becomes. Mexico's consumer price index has averaged roughly 4.5% to 5.5% annually over the past decade, compounding significantly over a 7- to 10-year hold.

4. The Notario's Role in Tax Calculation

Unlike in the US, where the seller is responsible for calculating and filing capital gains tax, in Mexico the notario publico handles the entire process. The notario is a government-appointed legal professional who supervises all real estate transactions and acts as the tax withholding agent for SAT.

At closing, the notario:

1. Reviews the original purchase deed and all supporting documentation
2. Calculates the inflation-adjusted cost basis using UDIS/INPC
3. Applies all allowable deductions (improvements, commissions, costs)
4. Computes the ISR using both the progressive rate method and the flat 20% method
5. Withholds the lower of the two amounts from the seller's proceeds
6. Remits the tax to SAT within 15 business days
7. Issues a constancia (certificate) documenting the tax paid

The constancia is critical — it is the document your US or Canadian tax preparer needs to claim the Foreign Tax Credit. Request a copy at closing and keep it with your permanent tax records. If your notario does not offer it proactively, ask for it explicitly.

5. Primary Residence Exemption

Mexico offers a limited capital gains exemption for primary residences, but it comes with conditions that exclude most foreign sellers of Cabo property:

• You must be a registered Mexican tax resident (RFC holder filing annual returns)
• The property must have been your primary residence for at least 3 consecutive years before the sale
• The exemption covers gains up to approximately 700,000 UDIs (roughly 5.8 million MXN or about $313,000 USD at current UDI values)
• The land area cannot exceed three times the construction footprint
• The exemption can only be used once every 3 years
• If co-titled with a spouse who also has an RFC, the exemption effectively doubles

For seasonal residents, snowbirds, and investment property owners, this exemption typically does not apply. If you are a full-time expat considering Mexican tax residency, consult a qualified Mexican tax attorney about whether establishing residency before selling could benefit you. The 3-year residency-in-the-home requirement means this requires advance planning — you cannot obtain residency the week before closing and claim the exemption.

6. US Tax Treaty and Reporting Requirements

US citizens and residents who sell property in Mexico face reporting obligations in both countries. The good news: the US-Mexico Income Tax Treaty is designed to prevent double taxation.

Foreign Tax Credit (Form 1116)

Article 13 of the treaty provides that gains from real property may be taxed in the country where the property is situated — Mexico. The US then allows a dollar-for-dollar Foreign Tax Credit for Mexican taxes paid on the same income, claimed on IRS Form 1116.

In practice, this means:

• You report the capital gain on your US return (Schedule D / Form 8949)
• You claim a Foreign Tax Credit for the ISR withheld by the notario
• If the Mexican tax equals or exceeds your US tax on the same gain, you owe no additional US tax
• If the Mexican tax is lower than the US tax (rare for substantial gains), you pay the difference to the IRS

The constancia from the notario is your proof of Mexican tax paid. Without it, the IRS may deny the credit. If you have excess foreign tax credits (Mexican tax exceeds US tax), you can carry them forward for up to 10 years or back 1 year.

FBAR and FATCA Reporting

Beyond the capital gain itself, US taxpayers may have additional filing requirements if sale proceeds touch a Mexican bank account:

• FBAR (FinCEN Form 114): Required if the aggregate value of all your foreign financial accounts exceeds $10,000 at any point during the calendar year. If your sale proceeds hit a Mexican bank account — even briefly — and push the total over $10,000, you must file. The deadline is April 15 with an automatic extension to October 15. Penalties for non-filing are severe: up to $12,906 per violation (non-willful) or the greater of $129,210 or 50% of the account balance (willful). More details on the IRS FBAR/FATCA comparison page.
• Form 8938 (FATCA): Required if total foreign financial assets exceed $50,000 on the last day of the year or $75,000 at any time (single filers; $100,000/$150,000 for married filing jointly). This form covers bank accounts, securities, and other financial assets — including your fideicomiso trust interest.

Many sellers instruct the notario to wire proceeds directly to a US bank account, which avoids triggering FBAR requirements. Discuss this option with your notario before closing.

7. Canadian Reporting Requirements

Canadian taxpayers selling Mexico property face a parallel set of obligations. The Canada-Mexico tax treaty similarly allows a foreign tax credit to prevent double taxation.

Key Canadian requirements:

• T1 Return: Report the capital gain under foreign property dispositions. Canada taxes 50% of capital gains (the "inclusion rate"), and the Mexican tax credit is applied against the Canadian tax owing.
• Form T1135 (Foreign Income Verification Statement): Required annually if the total cost of all specified foreign property exceeds CAD $100,000 at any point during the year. This includes real estate, bank accounts, and fideicomiso interests.
• Form T2209: Used to claim the foreign tax credit for Mexican ISR paid. Attach the notario's constancia as supporting documentation.

Canadian sellers should note that the exchange rate at the time of purchase vs. the time of sale can create a phantom gain or loss in CAD terms, independent of the actual property appreciation. A cross-border tax specialist familiar with the Canada-Mexico treaty is essential. For more on the Canadian buying process, see our Canadian buyer's guide to Cabo.

8. Legal Strategies to Minimize Your Tax Burden

Every strategy below is legal, well-established, and implemented through your notario and tax advisors. There are no gray areas here — these are standard planning tools.

1. Obtain an RFC before selling. Without a Mexican tax ID, you are locked into the 25%-of-gross-sale-price default. With an RFC and proper documentation, you can elect the net-gain method — which almost always produces a dramatically lower tax. Apply through SAT or with help from a Mexican tax attorney.
2. Document every improvement with facturas. This is the number-one mistake foreign sellers make. If you remodeled a kitchen, added a pool, or upgraded finishes, those costs are deductible — but only if you have official tax invoices (facturas). No factura, no deduction. Start collecting them from day one of ownership.
3. Hold for at least 5 years. The UDIS inflation adjustment compounds over time. A 5-year hold at 5% annual inflation increases your cost basis by roughly 28%. A 10-year hold increases it by roughly 63%. The longer you hold, the smaller your taxable gain.
4. Ensure your original deed reflects the actual purchase price. Some older transactions were recorded at values below the actual price paid. If your deed understates the price, your cost basis is lower and your taxable gain is higher. This must be addressed before listing.
5. Time the sale for tax year optimization. If you have other foreign income or losses, coordinate the sale timing with your US or Canadian tax year to maximize foreign tax credit utilization.
6. Wire proceeds directly to your home country. This avoids triggering FBAR and simplifies your reporting obligations. Discuss wire instructions with the notario before closing day.

What you should not do: do not attempt to understate the sale price on the deed to reduce the tax. This is tax fraud in Mexico, and SAT has become significantly more aggressive about auditing real estate transactions — particularly those involving foreign sellers. The notario is personally liable for accurate reporting and will not participate in price manipulation.

9. Timeline Considerations for Selling

Tax planning should start months before you list your property. Here is a practical timeline:

• 12+ months before sale: Gather all facturas for improvements. Request a copy of your original purchase deed from the notario or Public Registry. If you are considering Mexican tax residency for the primary residence exemption, consult a tax attorney.
• 6 months before sale: Get a preliminary tax estimate from a qualified notario. Coordinate with your US or Canadian tax advisor on sale timing and Foreign Tax Credit optimization.
• At listing: Set your asking price with tax implications in mind. Know your after-tax proceeds number before negotiating.
• At closing: Ensure the notario applies the progressive rate calculation (not the flat 20% withholding). Request the constancia immediately. Confirm wire instructions for proceeds.
• After closing: File the gain on your US or Canadian return. Claim the Foreign Tax Credit. File FBAR and Form 8938 or T1135 if applicable.

The most common costly mistake is not planning at all — sellers who show up to closing without facturas, without a tax estimate, and without coordinating with a cross-border advisor frequently pay tens of thousands of dollars more in tax than necessary. For context on annual property taxes in Cabo (separate from capital gains), see our predial guide. For investment analysis that accounts for tax at exit, read Is Cabo Real Estate a Good Investment in 2026.

10. Next Steps

If you are planning to sell property in Los Cabos, start with a preliminary tax estimate. Our team can connect you with notarios and cross-border tax professionals who specialize in foreign seller transactions in Baja California Sur.

For buyers evaluating a future purchase with exit planning in mind, understanding the tax at sale is essential to calculating your true return. Factor in the ISR, UDIS adjustment, deductible costs, and treaty credits when modeling your investment. Read our pre-construction vs resale guide for additional considerations on timing and appreciation. For details on fideicomiso trusts and the complete buying process, start with our foundational guides.

The bottom line: Mexico's capital gains tax on real estate is real, but it is manageable. Between inflation indexing, deductible costs, and treaty credits, a well-planned sale preserves the majority of your appreciation. The sellers who get hurt are the ones who do not plan. Do not be one of them.