Annual Tax Return and Real Estate: What to Report in Mexico

If you sold, rented out or acquired a property during the year, you will likely need to include that transaction in your annual tax return for a home sale or other real estate activity with the SAT (Mexico's tax authority). Even if the notary public (notario público) withheld and paid some tax at the time of the transaction, that doesn't always exempt you from reporting it on your annual return, because the SAT needs to see the full income reflected, along with the support showing why it generated no additional tax. Knowing what information to gather in advance helps you avoid a last-minute rush in April and reduces the risk of inconsistencies with the tax authority.

Which real estate transactions you must report

If you sold a property during the tax year, you must report the transaction on your annual return, even if an ISR (income tax) exemption applied, since the SAT wants to see the income reflected along with the support showing why it generated no tax. If you rented out a property, your rental income for the entire year must appear consolidated, together with the deductions or the simplified scheme you used month by month. And if you bought a property with funds that don't match the income you declared in prior years, it's advisable to be prepared to explain the source of those funds if the SAT asks, since significant acquisitions are usually recorded with the tax authority through the corresponding notarial notice.

Documents to have on hand

Gathering your documentation before filing saves time and reduces the risk of errors or omissions that could lead to a later request from the authority:

• Purchase-sale deed (escritura de compraventa) and the notarial certificate of ISR withholding, if applicable
• Rental CFDIs (electronic invoices) issued during the year, with the annual total added up
• Receipts for deductible expenses related to the property
• Updated constancia de situación fiscal (tax status certificate)
• Account statements supporting the source of the funds used in a significant purchase

What happens if you bought a property

Although buying a property does not generate income tax for the buyer, it is a transaction that the notary reports to the authorities as part of their informational obligations, especially when the amount is considerable. This means the SAT can cross-check that information against your prior income returns to verify consistency. If you used savings accumulated over several years, a formalized family loan or the sale of another asset to finance the purchase, it's wise to document those sources of funds well before signing, so you can respond without complications to any clarification the authority may request.

Frequently asked questions

Do I have to report the sale of my home even if it is exempt from ISR?

Yes, the transaction must be reflected on your annual return as exempt income, along with the supporting documentation showing why it qualified for the exemption.

What happens if I forget to report rental income?

You can file an amended return (declaración complementaria) to correct it. The sooner you do it, the lower the risk of surcharges or requests from the SAT.

Should I report the purchase of a property as an expense on my return?

It is not reported as a deduction or as an ordinary expense, but it is wise to have the source of the funds used documented, especially if the purchase amount is significant relative to your declared income.