Can a married couple have two primary residences?

In Mexico, married couples can own several homes at the same time, but the tax rule on the casa habitación exemption is strict: it only applies to one home per taxpayer. When both spouses have their own income and appear as co-owners, there are nuances worth understanding before listing a second house for sale.

What the casa habitación exemption is

Article 93, section XIX, paragraph a) of the Income Tax Law (LISR) exempts the income from the sale of the taxpayer's primary residence up to 700,000 UDIs (about $5.7 million MXN in 2026, depending on the UDI value).

To apply that exemption you must prove:

• That the property was the seller's primary residence.
• That it is in their name.
• That they have not sold another casa habitación with exemption in the prior 3 years (waiting-period rule).

One exemption per taxpayer

The key is that the exemption is personal: each spouse can apply it, but only to their own primary residence. So:

• If both spouses appear as 50% co-owners and the home was the primary residence of both, each can apply the exemption on their share, effectively summing two caps.
• If only one appears as owner, only that one applies the exemption.
• A second home, even if owned by the couple, doesn't qualify as casa habitación for tax purposes: it's taxed on the full gain.

Can there be two distinct primary residences?

Common sense and documentary evidence come into play. A couple may own two properties and argue each is the casa habitación of one spouse if:

• They live in different cities for work reasons (one in CDMX, the other in Monterrey).
• Each has their own tax address and expense receipts at their own home.
• They can show utility usage, paid property tax and invoicing in their name at each property.

In practice, the SAT can review whether a couple lives together and consider that only one of those homes is the real "casa habitación." To minimize risk, it's recommended to:

• Register each spouse's tax address at their respective home.
• Keep proof-of-address documents from the last 6 to 12 months (CFE, Telmex, property tax).
• Have official IDs with different addresses.
• Keep bank accounts and payroll with each address.

Property regime: effect on co-ownership

Marital community (sociedad conyugal)

If the home was bought during marriage under sociedad conyugal, both spouses are 50% co-owners, even if only one appears as the formal acquirer. On sale, each applies the exemption to their share.

Separation of property

In this regime, the property belongs to the spouse who acquired it. If both buy as express co-owners, each is taxed according to their actual share.

Concubinato

It doesn't automatically generate co-ownership. To apply casa habitación exemptions, each partner must appear in the deed as owner.

Step-by-step procedure to sell the second home

1. Determine if it qualifies as casa habitación

Review with your accountant whether that home is really your primary residence or just a second residence.

2. Gather supporting documents

• Electricity bill, property tax and water in your name.
• Official ID with that address.
• Bank statements from recent months.

3. Calculate the gain

The gain is computed by subtracting from the sale price the inflation-adjusted acquisition cost, documented improvements and notary fees paid at purchase.

4. Apply exemption if applicable

The notary computes ISR and applies the exemption up to the 700,000-UDI cap if you submit supporting documents and declare under oath that it is your casa habitación.

5. Keep evidence

Even after applying the exemption, keep supporting documents for at least 5 years. The SAT can review them later.

Consequences if the SAT rejects the exemption

If on review the SAT considers that the home was not your casa habitación:

• It will determine omitted ISR on the gain.
• It will apply adjustments and surcharges.
• It can impose a fine of 55% to 75% of the omitted tax.
• It may flag a tax discrepancy if the amount received doesn't match your declared income.

Example: couple with two homes

Imagine a couple in sociedad conyugal with two homes:

• Home A in CDMX, where she lives (and declares her address).
• Home B in Cuernavaca, bought as a getaway, where no one has tax address.

If they sell Home A and apply the joint exemption (each one for their 50%), the SAT accepts without issue with the supporting documents. If they sell Home B and try to apply it as casa habitación, the SAT will hardly accept it: they'll have to pay ISR on the full gain.

Recommendations

• Define which property is the main casa habitación and keep evidence.
• If you plan to keep two homes, consider deeding each in one spouse's name under separation of property.
• Before selling, simulate with your accountant the taxable gain and applicable exemption.
• Don't abuse the casa habitación concept: SAT reviews cross utility usage and bank movements.

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