Fixed vs. Variable-Rate Mortgage in Mexico: Which Is Better?

When comparing mortgage loans, one of the first questions is whether a fixed rate or a variable rate makes more sense. The good news for anyone buying a home in Mexico is that most bank mortgages today are offered at a fixed rate in pesos, which gives you certainty about your monthly payment for the entire term. Even so, understanding the differences, the risks, and how to compare offers using the CAT will help you make a better decision and read any offer you receive with a critical eye.

Fixed, variable, and mixed rates: what they mean

Before deciding, it helps to be clear on the three ways a mortgage's interest rate can behave over time:

Fixed rate

The interest rate is agreed at the start and stays the same for the entire life of the loan. Your monthly principal-and-interest payment doesn't change, no matter what happens with market rates. It is the most common arrangement in Mexican banking for peso-denominated mortgages.

Variable rate

The rate adjusts periodically based on a benchmark indicator (for example, an interbank or monetary policy rate) plus a bank margin. If market rates rise, your monthly payment or balance may grow; if they fall, you might pay less. It brings uncertainty in exchange for a potentially lower starting rate.

Mixed rate

It combines both: during an initial period the rate is fixed, and after that it becomes variable, tied to a benchmark. It is often presented as a middle ground, although in practice it shifts the interest-rate risk to the borrower once the fixed stage ends.

Why fixed rates dominate in Mexico

If you've gotten mortgage quotes from different banks, you probably noticed that almost all of them are offered at a fixed rate in pesos. This is no coincidence. Several reasons help explain why the Mexican market leans so heavily toward this arrangement:

• Historical memory of inflation: Mexico went through episodes of high inflation and crisis in past decades, when many loans with indexed payments became unpayable. That left a strong cultural preference for the certainty of a fixed rate.
• Competition among banks: institutions compete by offering attractive fixed rates as their main selling point, which reinforced the standard.
• Regulation and consumer protection: the mortgage transparency framework promotes easy-to-understand products, and the fixed rate is the simplest for the buyer to grasp.
• Certainty for planning: a stable monthly payment makes it easier for families to organize their budget over ten, fifteen, or twenty years.

The result is that, for most people buying a home today, the "fixed vs. variable" decision is often already settled by what's available: the fixed rate is the norm. Still, it's worth understanding the rest of the landscape, especially if you're offered mixed arrangements or promotions with a low introductory rate.

Side-by-side comparison

The following table summarizes, in general terms, how each type of rate behaves. Specific conditions vary by bank and your profile, so take it as a conceptual guide and not an exact rule.

If you want to see how this translates into specific products, check out our 2026 mortgage loan comparison, where we review the general terms offered by different institutions.

Risks of a variable rate

A low starting rate can be tempting, but it's worth understanding what you're accepting in return. These are the main risks of a variable or mixed arrangement:

That's why a variable rate tends to suit borrowers with ample income, a tolerance for risk, and the intention of paying off the loan within a few years. For most families seeking stability over a long term, the certainty of a fixed rate outweighs the possibility of an initial saving.

How to compare using the CAT

The interest rate doesn't tell the whole story. To compare loans fairly, there is the Costo Anual Total (CAT, or Total Annual Cost), a measure that incorporates the interest rate plus fees, insurance, and other associated costs, expressed as a single annual percentage. It is the tool promoted by Mexican regulation precisely to make comparisons easier.

• Compare CAT to CAT: ask for the CAT of each offer and compare them against each other; a lower CAT usually indicates a cheaper loan overall.
• Check the assumptions: the CAT is calculated under certain assumptions about amount and term. Make sure you compare figures calculated on similar bases.
• Watch out for variable rates: on a variable-rate loan, the CAT starts from today's rate and can change if the benchmark moves, so it is less predictable than on a fixed one.
• Include insurance: the CAT already accounts for life and property insurance; verify whether they are mandatory and whether you can purchase them elsewhere.

Our recommendation

For most people buying a home in Mexico, the fixed rate in pesos remains the most sensible option: it gives you a stable monthly payment, protects you against rate increases, and makes it easier to plan your budget over the entire term. It's also the arrangement banks offer most widely, so it will often be your natural starting point.

Consider a variable or mixed rate only if you thoroughly understand the risk, have ample income, and plan to pay off the loan within a few years, so that long-term uncertainty affects you less. In any case, always compare using the CAT and the amortization schedule, and not just the rate shown in the ad.

Before committing to a bank, determine how much you can put toward the down payment, since that influences the loan amount and terms. We help you with that in our guide on how much you need for a down payment on a house. And once your budget is clear, you can start to search for properties and estimate the value of the ones you like with our tool to calculate how much a home is worth.

Frequently asked questions

Can I easily get a fixed-rate mortgage in Mexico?

Yes. The fixed rate in pesos is the most common arrangement in Mexican banking for mortgage loans, so most of the offers you compare will already come under this modality.

Is a variable rate cheaper than a fixed rate?

It may start with a lower rate, but in exchange you take on the risk that it rises over time. It isn't necessarily cheaper in the long run; it all depends on how market rates behave.

What is a mixed rate?

It's an arrangement in which the rate is fixed during an initial period and then becomes variable, tied to a market benchmark. It offers certainty at the start, but pushes the interest-rate risk further down the road.

Why should I look at the CAT and not just the rate?

Because the CAT incorporates the rate plus fees, insurance, and other costs in a single annual percentage, which lets you compare loans more fairly than by looking only at the advertised interest rate.