Most foreign buyer content focuses on the acquisition side. Almost nothing addresses what actually happens when you sell. Yet your exit math determines your true return — and Mexican capital gains tax, fideicomiso transfer mechanics, and currency conversion all create either friction or efficiency depending on how you handle them.
This guide covers the operational reality of selling Mexican property as a foreign seller in 2026: tax calculation methods, deductions you can legally claim, the notario's role at sale, currency repatriation strategies, and timing decisions that materially affect net proceeds.
The two Mexican capital gains tax calculations — and which one you'll actually pay
Mexican Income Tax Law (ISR) requires the notario at sale to calculate two methods and apply the lower:
Method A: Proportional (gain-based)
Tax = 35% of (sale price minus adjusted acquisition cost minus authorized deductions). The "adjusted acquisition cost" inflates your original purchase price by the National Consumer Price Index (INPC) from purchase year to sale year — protecting you from being taxed on nominal gains that are really just inflation.
Authorized deductions include: original purchase price (CFDI-documented), improvements with CFDIs, notarial costs, commissions to registered Mexican real estate agents, predial paid during ownership, mejoras documented.
Method B: Deemed (gross-based)
Tax = 25% of gross sale price. No deductions allowed. Simpler calculation, almost always higher tax. Default when cost basis is poorly documented.
Which one applies to you
The notario calculates both and applies the lower (the law's "presunción" rule). For foreign sellers:
- If you have strong documentation (escritura, CFDIs for improvements, predial receipts, commission receipts) — Method A typically yields significantly lower tax. On a property bought $300K, sold $500K with $50K documented improvements, Method A might calculate ~$30K tax vs Method B's $125K. Massive difference.
- If you have weak documentation — Method B applies. Critical insight for foreigners: this is often the default outcome because foreigners don't realize improvements must be documented with CFDIs throughout ownership.
The documentation that determines your tax bill
Every improvement, every paid invoice, every closing cost over the years matters. Save everything in a dedicated file:
- Acquisition documents: Escritura pública, notarial receipts, ISAI receipt, fideicomiso setup invoice.
- Improvements: CFDI invoices for any renovation, construction, addition, major repair. Receipt-only invoices from informal labor don't count — must be CFDI.
- Annual costs: Predial paid receipts each year, fideicomiso annual fee invoices, major maintenance CFDIs.
- Sale-related: Real estate agent commission invoice (must be from registered agent), appraisal fees, new notarial costs.
Without CFDIs, the deduction is denied even if the work clearly happened. This catches foreign buyers off-guard who used informal contractors who don't issue CFDIs.
The Mexican tax-residency exemption — does it apply to you?
Mexican tax residents who sell their primary residence get an exemption up to 700,000 UDIS (approximately $5.5M MXN / $280K USD as of 2026), once every 5 years. This is the "casa habitación" exemption.
To qualify:
- You must be a Mexican tax resident (center of vital interests in Mexico, more than 183 days/year, etc.).
- The property must be your primary residence — documented via voter registration, utility bills, IMSS/INE, etc.
- You must not have used the exemption in the prior 5 years.
- Foreign buyers with Permanent Residency status using the property as primary residence often qualify.
For foreign buyers who established Mexican tax residency and used the property as primary residence, this is the most powerful exit-tax planning tool. It does NOT apply to second homes, investment properties, or short-term rental properties.
The fideicomiso transfer at sale — three scenarios
Scenario 1: Selling to another foreigner who wants to assume your fideicomiso
Cleanest and cheapest path. Buyer's lawyer requests bank approval for assumption. Bank reviews buyer's credentials. Approval typically 2-4 weeks. Buyer pays an assumption fee ($800-$2,000 USD typical) to the bank. Your fideicomiso continues with buyer as the new beneficiary.
You sign a transfer of beneficial rights at notario. The property never leaves the trust.
Scenario 2: Selling to another foreigner who wants their own fideicomiso
Your fideicomiso is terminated at sale. Buyer sets up a new fideicomiso (could be at different bank). Buyer pays full setup cost ($1,500-$3,000 USD).
From your perspective this is identical to Scenario 1 in time and cost — your fideicomiso closes, you receive proceeds, you're done.
Scenario 3: Selling to a Mexican citizen or qualified Mexican buyer
Your fideicomiso is terminated. Property goes to fee-simple ownership in buyer's name. No new fideicomiso needed (Mexican citizens don't need it). Cleanest legal transition.
This can actually be advantageous for sale price — Mexican buyers prefer fee simple over fideicomiso assumption, and may pay slightly more for the clean transfer.
The notario's role at sale — verify what they're actually doing
At sale, the notario must:
- Calculate ISR using both Method A and Method B, apply lower.
- Withhold the calculated ISR from sale proceeds and pay to SAT directly.
- Verify buyer's identity and funds availability.
- Verify property is free of liens, predial current.
- Record the transfer in escritura pública.
- Submit fideicomiso transfer or termination to the bank.
For foreign sellers, verify your notario is documenting Method A deductions properly. Bring your file of CFDIs and invoices to the closing. The notario will not chase you for documentation — if you don't provide it, Method B applies by default.
Currency repatriation — how to get USD-equivalent back to your country
You receive sale proceeds in MXN at the notario (after ISR withholding). Three approaches to get USD home:
Approach 1: Direct international wire (worst FX rate)
Notario wires MXN to your US/CA bank. Your home bank converts MXN to USD at retail rate, typically 2-4% worse than market mid-rate. On a $500K USD sale, this costs $10K-$20K vs better methods. Simple but expensive.
Approach 2: Mexican USD account holding strategy
Wire MXN to your Mexican bank account (HSBC, Santander, BBVA, Banorte all offer USD-denominated accounts for non-resident foreigners with RFC). Convert MXN to USD inside Mexico over time as rate is favorable. Then wire USD out.
Better FX rate than Approach 1 (typically 0.5-1.5% from mid-rate). Requires Mexican bank account and willingness to hold MXN/USD during conversion timing.
Approach 3: Specialized FX service (best rate, most active)
Services like Wise (formerly TransferWise), OFX, Currencies Direct, or specialized real estate FX brokers (e.g., Caxton, Equals Money for high-volume) offer USD conversion at 0.3-0.8% from mid-rate. Some allow you to lock the rate before closing (forward contract), eliminating FX exposure during the closing period.
For sales over $250K USD, the FX rate spread difference between Approach 1 and Approach 3 is typically $5,000-$25,000 USD. Meaningful enough to actively plan.
Timing the sale — strategic considerations
- FX timing: A weak MXN at sale time means more USD proceeds. If your sale isn't urgent, monitor MXN trends.
- Annual rental income timing: If the property generated rental income, ensure all income is accounted for in the calendar year of sale to avoid surprise tax exposure.
- Property tax cycle: Pay current year predial before sale — uncredited predial can complicate notarial closing.
- Mexican election cycles: Major political changes (federal elections every 6 years) can affect FX volatility around the transition. Plan around peak volatility.
- Market timing: Foreign-buyer markets (Cabo, Cancún) have seasonal demand — sales often complete faster Nov-Apr (peak inquiry season).
Pre-sale checklist — 60 days before listing
- Compile all CFDIs for improvements over ownership period.
- Compile all predial receipts.
- Compile fideicomiso annual fee invoices.
- Engage tax accountant to estimate ISR under both methods.
- Engage independent attorney to review existing fideicomiso for transferability.
- Open Mexican USD account if you don't have one (for FX strategy).
- Get appraisal to support asking price.
- Verify fideicomiso bank's current assumption requirements and fees.
- Interview 2-3 notarios with foreign-seller experience; select before listing.
- Decide FX repatriation approach.
The single biggest exit-strategy lever
For most foreign sellers, the difference between Method A and Method B taxation is the largest single financial lever in the entire sale. The difference between $30K and $125K tax on the same sale is real.
This lever is determined entirely by documentation discipline during ownership — not by negotiation or timing or any decision at sale. Foreign buyers who throw away CFDIs lose the ability to claim deductions years later. Foreign buyers who keep a clean file of every CFDI and improvement save tens of thousands of dollars at sale.
The lesson, ideally learned at acquisition: from day 1 of ownership, every improvement contractor must issue CFDI. Every receipt goes to a dedicated digital folder. Every year's predial is filed. Then at sale, your tax bill is the legal minimum — not the default Method B penalty for poor documentation.
FAQ
Do foreigners pay capital gains tax in Mexico when selling property?
Yes. Mexican Income Tax Law (ISR) applies to gains from sale of Mexican real estate regardless of seller nationality. Two calculation methods: (a) the proportional method (most common) — 35% tax on gain after authorized deductions, OR (b) the deemed method — 25% on gross sale proceeds without deductions. Your notario calculates both and applies the lower. For foreign sellers without strong cost-basis documentation, the deemed 25% often becomes default. With good documentation, the 35%-on-gain often yields lower actual tax.
What deductions can I claim against capital gains in Mexico?
Authorized deductions include: (a) original acquisition cost (purchase price + closing costs adjusted for inflation), (b) verified improvements with CFDI invoices, (c) notarial costs at sale, (d) commissions paid to a registered Mexican real estate agent (typically 4-7% of sale price), (e) appraisal fees, (f) property tax (predial) paid during ownership. Without CFDIs the deduction is rejected — this is why retaining all invoices throughout ownership is critical.
Can I avoid Mexican capital gains tax by being a Mexican tax resident?
Mexican tax residents (those with center of vital interests in Mexico, more than 183 days/year, etc.) get an exemption for sale of primary residence up to 700,000 UDIS (~$5.5M MXN / ~$280K USD as of 2026), once every 5 years. Foreigners who establish Mexican tax residency may qualify. The exemption does NOT apply to second homes, investment properties, or fideicomiso-held property used as second home.
How is the fideicomiso handled when I sell to another foreigner?
Two options: (a) Buyer assumes your existing fideicomiso (cheaper, faster — bank approval required, ~$1,000-$2,000 USD cost), or (b) Your fideicomiso is terminated and buyer sets up a new one (cleaner, slower — full setup cost $1,500-$3,000 for buyer). Most buyers prefer assumption for cost reasons. If selling to a Mexican buyer, fideicomiso is terminated and buyer receives direct title.
How do I get sale proceeds back to USD safely?
Three approaches: (a) Wire directly from notario escrow to your US/CA bank in MXN, converted by your bank (worst FX rate typically). (b) Wire to a Mexican bank account, then use a Mexican USD account at HSBC/Santander/BBVA to hold MXN, time conversion to USD when rate is favorable. (c) Use a specialized FX service (Wise, OFX, Currencies Direct) to lock conversion rate before closing and wire in USD. Approach (c) typically saves 1-3% on a $500K+ transaction — meaningful money.