Fixed Rate vs. Variable Rate: Which One Should You Choose for Your Mortgage?
INGAR · · Financing
Summary
In Uruguay, the "fixed-rate" mortgage as it is known in the United States or Europe does not exist. If you take out a mortgage today, it will most likely be denominated in Unidades Indexadas (UI) — an accounting unit that adjusts daily according to inflation. The TEA (Annual Effective Rate) offered by the bank —3.75%, 4.50%, 5.25%— is fixed. But your monthly payment in pesos increases every month, because the value of the UI increases every month.
This guide does not repeat the generic "fixed rate vs. variable rate" theory found in any financial blog from another country. It explains how the Uruguayan mortgage system actually works, what options you have, what happens to your payment when inflation moves, and how to budget so that the loan does not overwhelm you.
If you are evaluating financing for a purchase, also read:
- Mortgage credit in Uruguay: options, requirements, and timelines
- Step by step: how to buy an apartment in Uruguay
- What costs are involved in buying a property
The "fixed rate" myth in Uruguay
When someone searches "fixed rate mortgage Uruguay," they expect to find a loan where the monthly payment is exactly the same from the first month to the last. That does not exist here.
What does exist is a fixed TEA in UI. The bank tells you: "your rate is 4.50% per year in Unidades Indexadas." That 4.50% does not change over the life of the loan. But the Unidad Indexada does change — every day — because it is tied to the Consumer Price Index (CPI). If inflation rises, the UI rises, and your payment in pesos rises.
In other words:
- What is fixed: the interest rate (TEA) on the capital expressed in UI.
- What is variable: the value of the UI in pesos, which moves with inflation.
- The result: your payment in pesos increases every month, even though the rate has not changed.
This is not a flaw in the system. It is the system. And it has a logic: it protects the bank from inflation and protects the borrower from paying extremely high rates to compensate for inflationary uncertainty. But if no one explains this before you sign, it can feel like a trap.
What is the Unidad Indexada and why it exists
The Unidad Indexada (UI) was created by Law No. 17,761 in 2004, as an institutional response to the banking crisis of 2002. During that crisis, Uruguay experienced a peso devaluation of more than 90% in a few months, dollar deposits were forcibly rescheduled, and the financial system was devastated.
The root problem: Uruguay had a highly dollarized economy. Loans were made in dollars, salaries were paid in pesos, and when the exchange rate spiked, thousands of families were left with unpayable debts. A unit of account was needed that was neither the peso (subject to devaluation) nor the dollar (which creates currency mismatch).
The solution was the UI: a unit that adjusts daily according to the CPI, published by the Instituto Nacional de Estadística (INE). If monthly inflation is 0.5%, the value of the UI rises approximately 0.5% that month. The adjustment is daily, not monthly, making it gradual.
A concrete example: in June 2004, when it was launched, the UI was worth $1.00 (one peso). In early 2026, the UI is around $6.40. That difference reflects more than 20 years of accumulated inflation.
For a mortgage loan, this means:
- Your debt is expressed in UI (for example, 500,000 UI).
- Your payment is calculated in UI (for example, 3,200 UI per month).
- Each month, you multiply the UI amount of your payment by the current value of the UI to find out how many pesos you owe.
- Since the UI rises with inflation, your payment in pesos rises with inflation.
The real mortgage financing options in Uruguay (2026)
There are not twenty options. In practice there are three paths, and one of them accounts for 90% of loans:
Option 1: UI loan with fixed TEA (the standard)
This is what the vast majority of the market offers. The TEA is fixed for the entire life of the loan, and the payment adjusts for inflation through the UI.
| Bank | Indicative TEA (UI) | Maximum term | Maximum financing | Notes |
|---|---|---|---|---|
| BHU ("Préstamo Soñado") | From 4.50% | 25 years | Up to 90-100% | TEA depends on term, percentage financed, and whether you are a BHU saver |
| Santander | 4.00% – 5.00% | 30 years | Up to 80% | Better terms for clients with payroll at the bank |
| BBVA | 4.25% – 5.25% | 25 years | Up to 80% | Preferential rates for clients with direct payroll deposit |
| Itaú | 4.25% – 5.50% | 25 years | Up to 80% | Streamlined process for clients with a credit history |
| HSBC | 4.50% – 5.50% | 15 – 25 years | Up to 80-90% | First home up to 90% of market value |
| Scotiabank | 4.50% – 5.50% | 25 years | Up to 80% | Similar conditions to the private sector segment |
Important: these rates are indicative and change according to your profile (income, chosen term, percentage financed, relationship with the bank). Always request a simulation for your specific case. The TEA rates you see in advertising are the minimum possible, not necessarily the ones you will obtain.
For a detailed bank-by-bank comparison, see Bank Comparison 2026.
Option 2: USD loan (niche)
Some private banks offer mortgages in US dollars. The characteristics are very different:
- Rate: between 6% and 7.5% + VAT on interest (VAT on bank interest is 22% in Uruguay, which raises the effective cost).
- Term: generally shorter, between 10 and 15 years.
- Financing: lower percentage of the property value (60-70% is typical).
- Payment: fixed in dollars. Does not adjust for inflation.
It sounds attractive because the payment "doesn't rise." But it carries a major risk: currency mismatch. If you earn in pesos and owe in dollars, a devaluation could leave you paying double or triple what you budgeted. This is exactly what happened to thousands of Uruguayans in 2002.
This option makes sense only if you have genuine income in dollars (you export, work for foreign clients, or have USD-denominated income). If your salary is in pesos, avoid it.
Option 3: Fixed-rate peso loan (virtually non-existent)
In theory, a bank could offer you a peso loan with a fixed rate and fixed payment. In practice, this does not exist in the current Uruguayan mortgage market. The reason is simple: no bank is going to assume the inflationary risk of a 25-year loan in a country with 4-8% annual inflation. The rate they would charge to compensate for that risk would be so high (estimate 12-15% or more) that the loan would be unviable.
How your payment moves in practice
Suppose you buy an apartment for USD 120,000, finance 80% (USD 96,000), and obtain a TEA of 4.50% over 25 years. Your initial payment would be approximately 3,100 UI per month. With the UI at $6.40, that is about $19,840 pesos (around USD 460 at the current exchange rate).
That payment of 3,100 UI does not change (it is a classic French amortization system in UI). What changes is the value of the UI in pesos. Here is how your payment in pesos moves under different inflation scenarios:
| Year | 4% Inflation | 6% Inflation | 8% Inflation | 10% Inflation |
|---|---|---|---|---|
| Start | $19,840 | $19,840 | $19,840 | $19,840 |
| Year 1 | $20,634 | $21,030 | $21,427 | $21,824 |
| Year 3 | $22,317 | $23,628 | $24,996 | $26,403 |
| Year 5 | $24,134 | $26,544 | $29,143 | $31,952 |
| Year 10 | $29,367 | $35,529 | $42,830 | $51,459 |
| Year 15 | $35,715 | $47,548 | $62,979 | $83,087 |
| Year 20 | $43,438 | $63,623 | $92,553 | $134,090 |
The numbers speak for themselves:
- With 4% inflation (the current low range), your payment doubles in about 18 years.
- With 6% inflation (recent historical average), your payment doubles in 12 years.
- With 8% inflation, your payment doubles in 9 years and triples before the loan ends.
- With 10% inflation, your payment is multiplied by 6.7 in 20 years.
This is not a catastrophic scenario. It is basic compound interest arithmetic applied to inflation.
Why the UI system works (even if it doesn't seem like it)
Looking at the table above, it is easy to be alarmed. But there is a factor the table does not show: salaries also adjust for inflation.
In Uruguay, salaries are negotiated in the Wage Councils (Consejos de Salarios) and are periodically adjusted (generally every 6 or 12 months) with a component for past inflation and, sometimes, a correction. If your salary rises at the same rate as inflation, your payment in real terms remains constant or even decreases (because in a French system, the UI payment gradually reduces the proportion of interest and increases the proportion of principal repayment).
The problem arises when:
- Your salary does not keep pace with inflation (informal sectors, self-employed without adjustment, periods of crisis).
- You took out a loan at the maximum of your capacity and left no margin.
- Inflation spikes above expectations for an extended period.
Historically, inflation in Uruguay has moved as follows:
| Period | Average annual inflation |
|---|---|
| 2004-2010 | 7.0% – 8.5% |
| 2011-2019 | 7.5% – 9.5% |
| 2020-2022 | 7.0% – 9.9% |
| 2023-2025 | 4.5% – 5.5% |
| Feb 2026 (12 months) | 3.1% |
The current figure (3.1% year-on-year as of February 2026) is at the floor of the BCU's target range (3-7%). It is unusually low by Uruguayan standards. If you are going to take out a 25-year loan, do not budget with today's inflation. Budget with 5-7% annually as a realistic long-term scenario.
The psychological challenge: your payment rises every month
Beyond the numbers, there is an emotional component we tend to underestimate: seeing your payment increase every month feels bad, even if it is "normal."
In other countries, someone with a fixed-rate mortgage pays the same amount for 30 years. Inflation erodes the real value of their payment, and over time it feels progressively lighter. In Uruguay it is the opposite: your payment rises in pesos, and even though your salary also rises, the feeling that "you're paying more and more" persists.
This is not a minor issue. It generates anxiety, doubts about whether you "made the right call" by taking on debt, and real psychological pressure in the first years of the loan, when the payment weighs most heavily on your budget.
How to handle it:
- Understand the mechanics before you sign. If you know in advance that your payment will rise 5-7% per year, you won't be surprised when it happens.
- Compare in real terms, not nominal ones. If your payment rose 6% and your salary rose 7%, you gained 1% in capacity. The absolute number in pesos is irrelevant.
- Track your payment-to-income ratio, not your payment in pesos. If you started by allocating 28% of your income to the payment and a year later you're still at 28%, you're fine.
The 5 most common mistakes when taking a UI loan
1. Taking out the loan at the maximum of your capacity
If the bank approves a payment that represents 30% of your income, don't use all of it. Leave a margin. A good target is to start with your payment at 20-25% of your net income. That way you have a buffer for when the payment rises and your salary has not yet been adjusted.
2. Budgeting with current (low) inflation
Today inflation is at 3%. Tomorrow it could be 7%. If you modeled your budget with 3% inflation and it turns out to be 7%, your payment will rise twice as fast as you expected. Always model with 6-7% inflation as your baseline scenario.
3. Comparing only the TEA
Two banks might offer you "4.50% TEA" but with different conditions: higher mandatory insurance premiums, origination fees, appraisal costs, monthly commissions. What matters is the Total Financial Cost (CFT), not just the TEA. And check the details in Hidden costs when buying with a loan.
4. Confusing "fixed rate" with "fixed payment"
This is the mistake that motivates this entire article. The rate is fixed. The payment is not. If your bank officer says "fixed rate" and you interpret it as "fixed payment," you will have an unpleasant surprise the following month.
5. Not accounting for mandatory insurance
Every mortgage in Uruguay requires at least fire insurance and life insurance. These insurances also adjust over time: fire insurance for the property value, life insurance for your age and outstanding balance. It is an additional cost that increases over time and that many simulations do not include.
The dollar scenario: fixed payment, hidden risk
If someone offers you a mortgage in dollars, the proposal sounds attractive: fixed payment, no surprises. You pay USD 800 per month, every month, for 12 years. Simple.
But if you earn in pesos, that "USD 800" is not fixed in your budget. It is variable in pesos, because it depends on the exchange rate. Today the dollar is at $43. If it rises to $55 (which has happened), your payment goes from $34,400 to $44,000 pesos overnight, without warning. The UI at least gives you notice: it rises gradually, every day, a little at a time. The dollar can jump 20% in a week.
Uruguay's recent history has plenty of examples:
- 2002: the dollar went from $14 to $28 in a few months. Dollar-denominated debts became unpayable.
- 2015: the dollar rose from $24 to $30 in one year (25%).
- 2020: the dollar jumped from $37 to $44 between March and April (19% in one month).
That said, if your income is in dollars (or in a strong currency tied to the dollar), a dollar loan makes sense because it eliminates currency risk and the effective real rate can be competitive.
How to properly budget a UI loan
Here is the exercise we recommend before signing:
Step 1: Model with 6-7% inflation
Take your initial payment in pesos and project it with 6-7% annual growth. That is your expected payment in year 5. Ask yourself: "if my payment were that amount today, could I afford it comfortably?" If the answer is "barely," this is not your loan.
Step 2: Calculate your payment-to-income ratio using your current income
Not with the income you "will have" when you get a promotion or when your partner finds work. With what you earn today, verifiably. And aim to start with your payment at 20-25% of your net income, not the 30% the bank approves.
Step 3: Keep an emergency fund
Before paying the deposit and purchase costs, make sure you have at least 3-4 months of payments in reserve. Unexpected events happen: you lose your job, there's a medical expense, something breaks in the new home.
Step 4: Consider early amortization
Many UI loans allow early amortization without penalty or with a low penalty. If at some point you have a surplus (year-end bonus, proceeds from selling a car, inheritance), paying down principal reduces your future UI payment. It is one of the best investments you can make with extra money.
To calculate how much you can borrow based on your salary, see How much can I borrow based on my salary.
The question that really matters
It is not "fixed rate or variable." In Uruguay, that question is framed incorrectly. The TEA is fixed, but the payment is variable. All roads lead to the same place: a payment that adjusts.
The right question is: "Can I handle this if my payment rises 5-8% per year for the next 25 years?"
If the answer is yes —with margin, not at the limit— a UI mortgage is a reasonable instrument for buying your home. Current rates (3.75-5.50%) are historically low for Uruguay, inflation is contained, and the UI system protects against the currency mismatch scenarios that destroyed wealth in 2002.
If the answer is "it depends" or "I should be able to," you need to adjust: either buy something cheaper, save more to reduce the financed amount, or wait until your financial situation is more stable. There is no shame in any of those options. The shame is signing a loan you cannot sustain.
Checklist before signing
- You have requested simulations from at least 3 banks (BHU + 2 private banks).
- You have compared the Total Financial Cost, not just the TEA.
- You have modeled your payment with 6-7% inflation at 5, 10, and 15 years.
- Your initial payment does not exceed 25% of your verifiable net income.
- You have an emergency fund of at least 3-4 months of payments.
- You understand that the payment in pesos rises every month and it does not worry you.
- You know your bank's early amortization policy.
- You have included mandatory insurance (fire + life) in your budget.
- You have included notary fees, appraisal costs, and mortgage registration costs.
- Your income is periodically adjusted (Wage Council, collective agreement, etc.).