The First-Time International Buyer's Guide to San Miguel de Allende

Almost everything written about buying property in Mexico is written for someone who has already bought property somewhere. This page assumes you have not, or at least that you have never done it outside your own country.

The first thing to understand is that the difficulty is not legal. Mexican property law is codified, published and, on the points that matter to a first-time buyer, has barely moved in decades. Article 27 fracción I of the Constitution was last amended on 20 January 1960. The Foreign Investment Law articles that implement it carry reform annotations no later than 24 December 1996. The rules are not in flux and nobody is about to change them on you.

The difficulty is that the roles are distributed differently, and one role you are used to does not exist here by default.

What is actually different, in one table

Read the first row twice. Everything difficult about a first purchase in Mexico descends from it.

Nobody in the room is your advocate

Article 3 of the Ley del Notariado para el Estado de Guanajuato defines the notario as a lawyer invested with public faith whose function is to receive, interpret, draft and give legal form to the will of the parties. Articles 1 and 2 bind that function to impartiality, legality and autonomy.

Impartiality is the operative word. The notario will verify the seller’s capacity to sell, draft the escritura, calculate and remit the taxes and make the instrument registrable. The notario will not tell you the price is high, will not negotiate for you, and is under no obligation to point out that a clause is against your interest. That is not a failing. It is the design.

The agent does not fill the gap. A San Miguel brokerage publishes its own industry’s commission as 6 per cent plus tax, paid by the seller. TheLatinvestor gives 4 to 6 per cent seller-paid, with 0 to 2 per cent buyer-paid only where a separate buyer-agent agreement is negotiated. Both figures come from parties with a commercial interest, and both place compensation on the seller’s side of the table.

So the seat labelled “your side” is empty until you fill it. In practice that means retaining an independent Mexican lawyer, one not affiliated with the brokerage or introduced by the seller, before you sign anything or move any money. No source publishes what that costs here.

What the fideicomiso is, and why it is not your problem here

You will read a great deal about the fideicomiso, and almost all of it is written by people selling coastal property or trust services.

A fideicomiso is a bank trust. Inside the restricted zone, which Article 27 fracción I of the Constitution defines as a strip 100 kilometres along the international borders and 50 kilometres along the beaches, a foreigner cannot hold direct title to residential land. Article 11 of the Ley de Inversión Extranjera provides the mechanism used instead: a Mexican credit institution acquires the rights as trustee and the foreign buyer holds them as primary beneficiary, on a term Article 13 caps at fifty years and allows to be extended.

None of that applies in San Miguel de Allende. INEGI published a list in the Diario Oficial de la Federación on 21 May 1997 of municipalities located entirely outside the restricted zone, and the municipality of Allende, Guanajuato, whose seat is San Miguel de Allende, is named on it. Guanajuato is landlocked and shares no international border.

The practical consequence is simple. Your name goes on the escritura. No bank holds your title, no trust term runs, nothing renews, and no annual trustee fee is charged. Brokerage sources put coastal trust setup at 500 to 1,000 US dollars and the annual trustee fee at 500 to 700, none of which we could corroborate against a bank’s own published tariff. You pay neither here.

The one federal filing you do make

Buying outside the restricted zone is not unconditional. Article 10-A paragraph 1 of the Ley de Inversión Extranjera requires the foreign buyer to file with the Secretaría de Relaciones Exteriores a written agreement adopting what Article 27 fracción I provides. This is the Calvo clause: an agreement to be considered as a national with respect to that property, and not to invoke the protection of your government regarding it, on penalty of forfeiting the property to the Nation.

It concerns the property. It is not a renunciation of your citizenship and it does not affect your passport.

The 2026 federal fee is 5,252.02 pesos under Article 25 fracción XV of the Ley Federal de Derechos, payable rounded to 5,250.00 under Article 26-A of the same law. The timing is where the record fractures, so here is the fracture rather than the friendliest figure.

The likely reconciliation is that five business days is the legal deadline after which approval is automatic, while the longer figures describe how long it takes to obtain a physical document the notario will accept. No source confirms that, so we do not assert it. The brokerage figures also exceed the statutory fee by roughly 2,250 pesos, a handling charge nobody publishes.

RFC and CURP: what is asserted, and what is sourced

The CURP is Mexico’s population registry number. The RFC is the tax identification number issued by SAT, thirteen characters for an individual, ending in a three-character homoclave.

Expat guidance, brokerage pages and forum answers state confidently that a notario requires an active RFC from both buyer and seller, and that a CURP must be obtained first. We searched for the statutory basis and could not find one. No provision of the Guanajuato Civil Code, the Ley del Notariado or any SAT publication we could reach makes an RFC a condition of executing an escritura. There is also a circularity that first-time buyers hit repeatedly: obtaining an RFC generally requires proof of a Mexican domicile, which is precisely what you do not have before you own anything.

What is certain is why the question arises. Under Article 126 of the Ley del Impuesto sobre la Renta, the notario calculates and remits the seller’s provisional income tax under their own personal responsibility, within fifteen days of signing. A professional personally liable for a tax calculation is going to be strict about identification. That is a sufficient explanation for the practice without any of us pretending to know the rule.

Put the question to your specific notario, in writing, early. If someone tells you the answer is universal, ask for the article number.

The sequence, and what is honestly known about its duration

Most guides give a confident total of roughly 60 to 120 days from accepted offer to keys. We cannot source it, so we do not publish it as a fact. Exactly one statutory deadline sits inside the process and one tax deadline follows it. Everything else is practice, and practice varies by notario, by seller and by how clean the title turns out to be.

Two legal points anchor the whole sequence. Article 1815 of the Guanajuato Civil Code makes an escritura pública mandatory for the sale of real property, unconditionally and with no value threshold. Article 1816 provides that the sale produces no effect against third parties until registered, and Article 2497 confirms that unregistered documents bind only those who granted them. Signature binds the parties. Registration binds the world. Until then you are exposed, and that is the strongest argument against a relaxed attitude to the final step.

What it costs, starting with what is fixed by law

The largest single line is the acquisition tax, ISAI. It is not the flat 2 per cent repeated across the internet. Two per cent is only the first bracket of a progressive tariff under Article 7 of San Miguel’s 2026 municipal revenue law, topping out at a fixed 39,125 pesos plus 4 per cent of value above 1.5 million.

That is deterministic arithmetic on the published tariff. Article 180 of the Ley de Hacienda para los Municipios del Estado de Guanajuato assesses ISAI on the highest of registered fiscal value, transaction value, or a certified appraisal less than a year old, so declaring a low price does not reduce it.

Adding only the lines statute actually fixes, using electronic filing rates and the maximum notary fee the residual Guanajuato arancel permits, produces a floor:

That 4.6 per cent is our arithmetic, not a published figure, and it is a floor rather than an estimate. The notary column is the maximum under Article 21 of the Guanajuato Ley Arancelaria, and Article 2 of the same law states that the scale applies only in the absence of a contract between notary and client. It is a residual default, not a cap, and real fees are negotiated above it.

What it costs, where the record runs out

Published totals for buyer closing costs range from about 4 to 9 per cent, clustering at 5 to 6.5 per cent. Mexico News Daily gives San Miguel 5 to 6 per cent against closer to 8 per cent in Querétaro. Mexperience gives a general Mexican range of 5 to 10 per cent. None of these is derived from recorded transactions, because no dataset of San Miguel closing costs exists.

The gap between the 4.6 per cent statutory floor and those published ranges is the negotiated part: notary fees above the arancel, gestoría and trámite handling, escrow, your own legal fees, the private valuer’s professional fee, translation. Figures for those soft costs come only from commission-motivated or secondary publishers, and are recorded as attribution rather than endorsement: escrow at 300 to 500 US dollars for the buyer’s half, a power of attorney usually under 500 before apostille, an exchange-rate reserve of 1,000 to 2,000 mostly refundable, translation at 3,000 to 25,000 pesos, and a tax adviser at 3,000 to 12,000 pesos.

After closing, predial runs on a marginal scale of 0.234 to 0.354 per cent of fiscal value on urban built property, discounted 15 per cent for payment of the full year in January and 10 per cent in February. Fiscal value is not market value, and nobody publishes the ratio between them here, so no statutory rate converts into a percentage of what you paid.

The mistakes first-time buyers actually make

Wiring funds without independently confirming the account. No source quantifies transfer fraud in San Miguel transactions, and we will not invent a figure. The structural point stands without one: your money leaves an account you control and enters one you do not, in a jurisdiction where nobody in the transaction is contractually obliged to protect you, and where title is not good against third parties until registration. Confirm banking details by voice with a person you have independently verified, on a number you sourced yourself, every single time, including when the details appear to come from a party you have been corresponding with for months.

Renovating without facturas. This is the most expensive quiet mistake in San Miguel, and it is invisible for years. Article 121 of the Ley del Impuesto sobre la Renta allows a Mexican tax resident to deduct capitalised improvements when computing the gain on sale, and explicitly excludes conservation and maintenance. Article 124 then writes the construction component of your basis down 3 per cent per year of ownership, floored at 20 per cent, and where the deed does not separate land from construction, deems land to be 20 per cent of total cost, which is usually unfavourable here. Because the notario is personally liable for the calculation, they will not accept deductions without complete facturas. Cash-paid work with no invoice is not a discount. It is basis you have destroyed. Ask your notario to separate land and construction in the acquisition deed, and keep every factura from the day you take possession.

Assuming an inspection culture that does not exist. We found no published standard, licensing regime or survey of inspection practice for San Miguel de Allende. Two documents get mistaken for one: the avalúo is a valuation for tax purposes and the lien certificate is a registry snapshot. Neither says anything about the building. In a town of old masonry construction that is a serious gap, and it is yours to close. Water deserves particular attention: CONAGUA’s determination for the Cuenca Alta del Río Laja aquifer records a deficit and explicitly zero volume available for new concessions, so how a property is actually supplied is a question worth answering before rather than after.

Trusting a verbal price. Nothing agreed verbally is enforceable in a transaction that Article 1815 requires to be in a public deed. That includes what is included, what will be repaired, when possession passes and what the seller will leave behind. Put it in the promissory contract or accept that it does not exist. The same applies to the price. Local inventory averaged 29.6 months over the first five months of 2026 against 17.6 a year earlier, active listings rose 45 per cent year on year to 860 in May, and the 2025 average sale price fell 12.6 per cent. Asking prices in that market sit above clearing prices by a margin nobody has measured, because no sale-to-list ratio is published for San Miguel. A first-time buyer who treats the asking price as the value is agreeing to a number no source supports.

Assuming the house comes with the right to live in it. Ownership and immigration status are separate systems, and Article 53 of the Ley de Migración generally bars a visitor from changing their condition of stay from inside Mexico. Buy the house and you own the house.

What we could not source, and will not invent

• Whether an RFC is legally required to complete an escritura, and how the domicile circularity is resolved in practice.
• Deposit norms here: amount, who holds it, under what instrument, on what release conditions.
• Notary fees actually quoted in San Miguel in 2026. The arancel is displaceable by agreement and no schedule or survey exists.
• Real 2026 SRE processing times. Three published figures, no operational data.
• Gestoría and handling fees, which demonstrably exist given the gap between 5,252.02 and the 7,500 pesos quoted.
• Any documented inspection convention, standard or licensing regime for San Miguel property.
• The ratio of cadastral fiscal value to market value, without which no predial or ISAI rate translates into a percentage of the price paid.
• Whether title insurance is commonly bought here, from whom, and at what cost.

If you are given a confident answer to any of these, ask where it comes from. In our experience the answer is usually the last person who said it.

This page is published research, not legal or tax advice. Where the law is settled we have cited the article; where sources conflict we have printed the conflict rather than choosing the friendlier figure. The notario handling your transaction is the legal authority on that transaction, and an independent lawyer you retain is the only person in the process obliged to act in your interest. Invest In San Miguel earns no commission and has no financial interest in whether your purchase closes.