Written for Mexico. This analysis applies to Mexican federal tax law — ISR (income tax), IVA (VAT) and SAT rules — and cites Mexican statutes. Amounts are in Mexican pesos (MXN).
Selling your primary residence is the estate transaction with the most stacked exemptions in the Mexican system — to the point that, executed well and in the right state, the seller's total tax bill can be zero. But "executed well" has exact requirements, and each layer (federal ISR, federal IVA, state) has its own. Here is the full teardown, with the state map almost no one checks before selling.
Layer 1 — ISR: exemption up to 700,000 UDIS (art. 93, fracc. XIX)
The gain on the sale of your primary residence is exempt up to 700,000 UDIS (inflation-indexed units) — around $6 million pesos at the current UDI (estimate; the UDI moves daily — check it here). The requirements, without ornament: (a) that it be your primary residence — proven to the notary with documents in your name at that address (electricity or phone bills, bank statements, ID or tax domicile); (b) that you have not used this exemption in the three years prior — the notary checks this in the system; and (c) that the transaction be formalized before a notary public. The exemption is on the gain, not the price: you sell for $9M what cost $4M → gain $5M → below the ceiling → ISR: $0. And if the gain exceeds the ceiling, only the excess is taxed — with the four deductions of art. 121 (adjusted cost, improvements with CFDI, notary fees, commissions) working in your favor. Spousal multiplier: in co-ownership, each spouse applies their own exemption on their share — the couple's practical ceiling can be around $12M.
Layer 2 — IVA: exempt by nature (art. 9, fracc. II)
The sale of construction intended for residential use is exempt from IVA — and land always is (fracc. I). Selling your home does not trigger IVA regardless of the amount or how many times you do it. A contrast that gives perspective: a commercial unit or an office does trigger IVA on the construction — another structural reason why the home is the individual's favored asset (the full argument in in whose name to buy).
Layer 3 — the state layer: here the location of the property decides
The IVA Law (art. 43) allows states to charge individuals a cedular tax on the gain from selling real estate located in their territory — a levy additional to and independent of federal ISR, which is triggered where the property is even if you live in another state. Today four states have it in place: Chihuahua, Guanajuato, Quintana Roo and Yucatán, in every case at a rate of 5% on the gain (moderate-high confidence; other states such as Guerrero, Nayarit or Oaxaca have cedular taxes in other schedules — leasing, activities — with no record of one on sales, and state finance laws change: verify your state's law at the time of the transaction). Two consolations for anyone selling in those four: state laws usually mirror the federal ISR primary-residence exemption (Guanajuato does so expressly), and the cedular tax paid is deductible against your federal gain (art. 121, fracc. III LISR). In the rest of the country — Nuevo León, Mexico City, Jalisco, State of Mexico and the vast majority — the seller faces no state layer at all: only the federal ones, which as we saw can be zero. The ISAI (property-transfer tax) that does exist everywhere is paid by the buyer, not you. Result in the clean scenario: primary residence proven + gain below 700,000 UDIS + three years since the last exemption + property outside the four states with a cedular tax = $0 ISR, $0 IVA, $0 state.
Are you going to sell — or should you reorder before selling?
The prior diagnostic pins down your exact scenario: the applicable exemption and its three-year remainder, co-ownership and its multiplier, documentable deductions on the excess, and your state's layer. And when the requirements are not yet met — statements at the wrong address, exemption used two years ago, suboptimal ownership — the calendar and the structure are corrected before listing, not at the notary's office. Months of lead time are literally worth millions in this transaction.
Frequently asked questions
How many times can I use the exemption?
No lifetime limit — the lock is on frequency: once every three years. For estates with several properties, the sequence of sales (which one is sold as the primary residence, and when) is a timing decision worth millions.
Do a vacation home or a lot qualify?
No: the exemption is for 'the' primary residence — the one you live in and can prove. The second home is taxed with the art. 121 deductions; a bare lot (with no residential construction) also has no ISR exemption, even though land is exempt from IVA. Each asset with its own exit plan.
I live in the house but it's in my mother's name — who gets the exemption?
The owner who lives in it and proves it gets the exemption — if your mother lives there and it's her primary residence, the exemption is hers when she sells. If the plan is for you to sell it, the prior transfer (a direct-line gift, between ascendants and descendants, exempt from ISR with its formalities) plus a period of residence provable in your name is structured well in advance — it's the textbook example of why estate planning is a matter of timing.
What does the notary withhold if I apply the exemption?
No ISR on the exempt portion — the notary applies the exemption directly in the deed when you prove the requirements, and only computes and remits on the excess if there is any. That's why you bring the papers to the notary already resolved: a notary who cannot verify your exemption is required to withhold as if it did not exist.
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