Mexico's Proposed 10% Inheritance Tax: What Every Cabo Property Owner Needs to Know

Mexico's proposed inheritance tax on Cabo property has become the single most-asked question in my inbox this fall. Here is the short answer: Mexico currently charges zero federal inheritance tax. A legislative proposal introduced in April 2026 would change that by imposing a flat 10% levy on inherited estates exceeding 15 million pesos — approximately $750,000 USD at current exchange rates. The proposal has not been enacted. But if you own a $1.2 million villa in Pedregal or a $2.5 million beachfront lot in Costa Palmas, you need to understand what is on the table and what to do about it right now.

Current Law: Mexico Has No Inheritance Tax

Before we talk about what might change, let me be crystal clear about where things stand today. Mexico does not impose a federal inheritance tax, estate tax, or death duty. When a property owner dies and the estate passes to heirs, the transfer is generally exempt from income tax under Article 93 of Mexico's Income Tax Law (Ley del Impuesto Sobre la Renta). This exemption applies to both Mexican nationals and foreign owners.

For foreign owners holding Cabo property through a fideicomiso (bank trust), succession is governed by the beneficiary designation within the trust instrument and, ideally, a complementary Mexican will. The fideicomiso does not avoid probate by itself — but a properly structured beneficiary designation allows the trust bank to transfer beneficial interest to named heirs without a full intestate proceeding.

The key point: under current law, your heirs pay no Mexican inheritance tax on a Cabo property regardless of its value. The only costs are the notario's fees for the succession proceeding, which typically run $3,000–$8,000 USD depending on complexity, and the ISABI acquisition tax assessed by the state of Baja California Sur on the transfer (currently around 2% of the catastral value).

What the Proposed Inheritance Tax Actually Says

In April 2026, a coalition of Morena legislators introduced a bill that would create a federal tax on inheritances and large donations. The Garrigues law firm analysis summarizes the core structure:

• Tax rate: A flat 10% on the value of inherited assets exceeding the threshold
• Threshold: 15 million Mexican pesos, approximately $750,000 USD at the October 2026 exchange rate of roughly 20 MXN/USD
• Scope: Both domestic and international assets owned by Mexican tax residents, and Mexican-situs assets owned by non-residents
• Donations: The same 10% rate would apply to gifts exceeding the threshold

For a foreign owner of Cabo real estate, the critical word is "Mexican-situs." Your fideicomiso property is located in Mexico. Even if you are a US or Canadian tax resident who never files a Mexican return, the property itself sits within Mexico's taxing jurisdiction. If this bill passes in anything close to its current form, your heirs would owe 10% on the property value above 15 million pesos.

Worked Example: A $1.5M Pedregal Villa

Suppose you own a villa in Pedregal with a fair market value of $1.5 million USD (approximately 30 million pesos). Under the proposal:

• Threshold: 15 million pesos
• Taxable amount: 30M − 15M = 15 million pesos
• Tax: 15M × 10% = 1.5 million pesos (~$75,000 USD)

For a $3 million property in Querencia (60 million pesos), the math becomes: 45M × 10% = 4.5 million pesos (~$225,000 USD). That is not a rounding error. That is a significant estate planning event.

Potential Exemptions and Open Questions

The draft bill includes language that may exempt certain transfers, but the final text is still being negotiated in committee. Based on the Chambers Private Wealth 2026 Mexico guide, the key open questions are:

• Spouse-to-spouse transfers: The draft suggests an exemption for transfers between spouses, consistent with most international inheritance tax regimes. However, the definition of "spouse" for foreign couples married under non-Mexican law is ambiguous.
• Ascendant-to-descendant transfers: Transfers from parents to children may qualify for reduced rates or exemptions, but the current language is broader than the exemptions in Mexico's existing income tax law.
• Fideicomiso treatment: The bill does not specifically address fideicomiso succession. The trust bank holds legal title, and the beneficiary holds equitable interest. Whether the transfer of beneficial interest triggers the tax — and at what valuation — is an unresolved question.
• Valuation methodology: The bill references "fair market value," but Mexico's catastral values (used for predial tax) are typically 30–60% below market. Which value applies could cut the tax bill in half or more.

How Mexico's Proposal Compares Globally

Compared to the US estate tax, a 10% flat rate with a ~$750K threshold is actually more aggressive in terms of who it catches. The US exemption of $13.6 million means most American estates never pay federal estate tax. Mexico's proposed $750K threshold would capture the majority of foreign-owned properties in Los Cabos, where the median closed sale price exceeded $800K in Q3 2026.

How This Affects Fideicomiso Succession

If you hold Cabo property through a fideicomiso — and virtually every foreign owner does — the succession mechanics become the focal point. Under current law, when you die, the trust bank transfers beneficial interest to your named beneficiaries. This is not a "sale" and does not trigger capital gains tax. It is a succession event, currently tax-free at the federal level.

Under the proposed legislation, that succession transfer could become a taxable event. The bill's language about "transfers by reason of death" appears broad enough to encompass fideicomiso beneficiary changes. However, because the trust bank is the legal title holder, there is a technical argument that no "property" changes hands — only beneficial interest in the trust. Whether this distinction survives committee markup is anyone's guess.

What I tell my clients: do not plan around a loophole that has not been tested. If this bill passes, assume the fideicomiso transfer will be taxed until a court or regulation says otherwise.

Five Steps to Take Right Now

Whether this proposal passes or dies in committee, these five steps are smart estate planning regardless:

1. Get or Update Your Mexican Will

A Mexican will (testamento) is a separate document from your US or Canadian will. It governs the disposition of your Mexican-situs assets and dramatically simplifies probate. Without one, your heirs face an intestate succession proceeding in Mexico that can take 12–24 months and cost $15,000–$30,000 in legal fees. A Mexican will costs $1,500–$3,000 to prepare and should be reviewed every two years or after any major life event. Read more in our guide to Mexican wills and inheritance for foreign property owners.

2. Review Your Fideicomiso Beneficiary Designations

Pull out your trust agreement and confirm: (a) who is named as beneficiary, (b) whether the designation is primary and contingent, (c) whether the trust language aligns with your latest will. I have reviewed fideicomiso documents where the beneficiary was an ex-spouse, a deceased parent, or nobody at all — the default being the owner's legal heirs under Mexican succession law, which may not match the owner's intent.

3. Coordinate US and Mexican Estate Plans

The single biggest estate planning mistake I see among Cabo property owners: they have a thorough US estate plan that ignores their Mexican assets, and a Mexican will that contradicts their US trust. Get both attorneys in the same room — or at least on the same email thread. The cross-border estate planning coordination costs $2,000–$5,000 and can save your heirs $50,000+ in legal fees and tax exposure.

4. Understand the US Treaty Implications

The US-Mexico tax treaty does not currently contain a specific estate tax provision because Mexico has no estate tax. If Mexico enacts one, treaty negotiations would likely follow — but that takes years. In the interim, US owners could face a scenario where Mexico taxes the inheritance at 10% and the US taxes the same estate at 40% (above the $13.6M threshold), with limited or no treaty relief for double taxation. For estates in the overlap zone, this is a meaningful exposure.

5. Consider Lifetime Transfer Strategies

If the proposal becomes law, transferring property during your lifetime — rather than at death — may become attractive. Under current Mexican law, a fideicomiso beneficiary change is possible (with bank approval and notario involvement) and may be structured as a gift or an inter vivos transfer. The costs are the ISABI acquisition tax (~2%), notario fees, and any capital gains tax triggered by the transfer. Whether this is cheaper than a potential 10% inheritance tax depends on the property's basis and current value — run the numbers with your tax advisor before acting.

Legislative Timeline and Probability

Morena and its allies hold a supermajority in both chambers of Congress, which means they have the votes to pass this bill without opposition support. That said, Mexico's legislative calendar is crowded. The 2027 federal budget package was submitted on September 8, 2026, and is consuming most of the legislative bandwidth through December. The inheritance tax proposal is a separate bill and may not reach a floor vote in the current session.

Tax practitioners I speak with put the probability of passage in 2026 at under 20%. The probability of eventual passage — in some form, at some threshold — within the next three to five years is closer to 50-50. Mexico's tax base is narrow, the fiscal deficit is growing, and inheritance taxes are an obvious revenue tool that most OECD countries already employ. The question is not whether Mexico will ever tax inheritances, but when and at what rate.

The Chambers 2026 trends report for Mexico notes that the proposal "signals a clear policy direction" even if the specific bill stalls. I agree. Plan accordingly.

Do Not Panic — But Do Not Ignore It

I have heard from three clients this month who are considering selling their Cabo properties because of this proposal. That is an overreaction. A 10% tax on an unrealized future event that has not been enacted is not a reason to exit a property that generates 6–8% annual rental yield and has appreciated 40%+ since purchase. What it is, is a reason to spend $3,000–$5,000 on a thorough cross-border estate plan review.

The owners who get hurt by tax changes are the ones who do nothing. The ones who come out ahead are the ones who plan two steps ahead of the legislation. That has been true in every market I have worked in across 12 states, and it is true in Mexico.