ISR Withholding on Rental Income from a Fideicomiso in Mexico (Non-Resident Guide)

A non-resident who earns rental income from a property held in a fideicomiso in Mexico is subject to ISR (income tax) on that income, most commonly at a flat rate of around 25 percent on gross rent with no deductions. Alternatively, by registering with Mexico's tax authority (SAT), a non-resident can elect to be taxed on net income at progressive rates after subtracting allowable expenses. The property being held in a fideicomiso does not change this; you are taxed as the beneficial owner earning Mexican-source income.

Here is how ISR withholding actually works for a foreign owner renting out an oceanfront condo near Ensenada.

Why ISR applies to you

Rental income is sourced where the property is located. Because your condo sits in Mexico, the rent it generates is Mexican-source income, taxable in Mexico regardless of your residency or where the tenant pays from. Non-residents are taxed only on this Mexican income, not on their worldwide earnings.

The two ways non-residents are taxed

Flat 25 percent on gross income

The default and simplest method for non-residents is a flat ISR rate of roughly 25 percent applied to gross rental income. There are no deductions, so the calculation is easy: you owe a quarter of every rental dollar in tax. This suits owners with low operating costs or those who want minimal paperwork.

Net-income regime after registering with SAT

If you obtain an RFC and register with SAT, you can instead be taxed on net rental income at progressive rates. This lets you deduct legitimate expenses:

• Property management and booking platform fees
• Maintenance, cleaning, and repairs
• Predial (property tax) and trustee fees
• Building depreciation
• Utilities you cover

For owners with meaningful expenses, especially furnished short-term rentals, the net-income regime often produces a lower effective tax than the flat 25 percent. A Mexican accountant should compare both for your numbers.

Who does the withholding

The word withholding matters because, in several scenarios, someone collects the tax before you ever see the rent.

• Business tenants: If you lease to a Mexican company, it may be legally required to withhold ISR and remit it directly to SAT.
• Rental platforms: Airbnb, Vrbo, and similar platforms operating in Mexico withhold a portion of ISR (and IVA) from host payouts and forward it to SAT. The rate they withhold can vary depending on whether you have provided an RFC.
• Individual long-term tenants: A private individual renting your unit typically does not withhold, leaving you responsible for declaring and paying.

Providing your RFC to a platform usually reduces the withholding rate they apply, because registered taxpayers are presumed to be filing properly.

Filing is still required

Withholding is a prepayment toward your liability, not a substitute for filing. In most cases you still need to:

1. Obtain an RFC from SAT.
2. Engage a Mexican accountant familiar with non-resident rentals.
3. File the required periodic and annual declarations.
4. Reconcile amounts already withheld against your true ISR owed, paying any difference or claiming overpayment.

Skipping the filing because tax was withheld is a common and avoidable mistake.

Coordinating with US taxes

US citizens and residents must also report this rental income to the IRS on their worldwide return. The good news is that ISR paid in Mexico generally qualifies for the US foreign tax credit, which prevents the same income from being taxed twice. Have your Mexican accountant and US tax preparer share figures so credits line up correctly.

A simple decision framework

• Low expenses, want simplicity: accept the flat 25 percent gross withholding.
• High expenses or active short-term rental: register with SAT, get an RFC, and use the net-income regime to deduct costs.
• Renting through Airbnb or Vrbo: always provide your RFC to reduce platform withholding, then reconcile at filing.

Model the after-tax yield before you buy

ISR is predictable once you know your regime, and pairing it with Mexico's very low predial keeps the overall tax burden competitive against US oceanfront rentals. Modeling your after-tax return up front lets you choose the right unit and rental strategy.

If you are weighing a residence as a rental, our team can introduce local accountants and share realistic occupancy and income figures for the Ensenada coast. Browse the residences and reach out through WhatsApp or our contact form to arrange a private visit and run the numbers together.