How much is paid per month for a mortgage of 100,000 to 300,000 euros: installments according to the term and the interest

How much is paid per month for a mortgage of 100,000, 150,000, 200,000, 250,000 or 300,000 euros? The answer mainly depends on the interest rate and the repayment term. A seemingly small difference in either of these two variables can change the monthly payment by tens or even hundreds of euros.

The latest data published by the National Institute of Statistics (INE), corresponding to June 2026, places the average interest rate of new home mortgages at 2.96%, while the average term was 25 years. The average amount reached 178,365 euros, 6% more than a year earlier.

To check how these variables affect the payment, the following simulations use the French amortization system, common in Spanish mortgages, and three hypothetical fixed rates of 2.5%, 3%, and 3.5%. They are indicative examples: they do not represent commercial offers nor include insurance, fees, taxes, or other associated costs.

How much is paid for a mortgage at 3%

The 3% allows for the construction of a central scenario very close to the last average rate recorded by the INE, of 2.96%. Keeping that interest constant, the difference between taking out the mortgage for 20, 25, or 30 years is considerable.

A mortgage of 100,000 euros for 25 years at 3% would thus have an approximate monthly payment of 474 euros. For 200,000 euros, the payment would rise to about 948 euros, while financing 300,000 euros under the same conditions would raise the payment to approximately 1,423 euros per month.

The effect of the term is especially noticeable in higher loans. A mortgage of 300,000 euros at 3% would go from about 1,664 euros per month for 20 years to 1,265 euros for 30 years, nearly 400 euros less each month.

How much does the payment change if the interest goes from 2.5% to 3.5%

The term is not the only decisive variable. To exclusively observe the effect of the interest, a repayment period of 25 years can be kept constant and the applied rate modified.

In a 200,000 euro mortgage for 25 years, going from 2.5% to 3.5% means raising the monthly payment from about 897 to approximately 1,001 euros. That's around 104 additional euros each month while keeping the capital and the term identical.

The difference increases in absolute terms as the loan grows. For 300,000 euros, the same change of one percentage point would raise the approximate payment from 1,346 to 1,502 euros monthly.

Extending the mortgage reduces the payment, but increases the interest

Choosing a longer term allows for a reduction in the monthly outlay because the capital is spread over a greater number of payments. However, paying less each month does not mean that the mortgage is cheaper.

Let's take as an example 200,000 euros at 3%. Over 20 years, the monthly payment is around 1,109 euros and the total payments at the end of the loan would be about 266,200 euros. Over 30 years, the payment drops to approximately 843 euros, but the total payments would approach 303,600 euros.

In this example, extending the term by ten years provides a monthly relief of about 266 euros, but means ending up paying around 37,400 euros additional over the life of the loan. The comparison assumes in both cases that the 3% remains constant.

The average rate of new mortgages is slightly below 3%

The central scenario used in the simulations approximates the mortgage market reflected by the latest official statistics. In June, the average interest rate was 2.96% and the average term remained at 25 years.

The INE also distinguishes between modalities. 61.7% of new mortgages on homes were established at a fixed rate and 38.3% at a variable rate. The initial average rate was 2.89% for fixed rates and 3.07% for variable rates.

This does not mean that a person applying for a mortgage now will necessarily obtain those rates. They are averages of the operations registered in the property records and the specific conditions may vary depending on the entity, the financial profile of the client, and the characteristics of the loan.

The average mortgage already exceeds 178,000 euros

The size of the operations has also increased. In June, 45,907 mortgages on homes were established, 10.8% more than in the same month of 2025, and the average capital lent reached 178,365 euros. The data for 2026 is still provisional.

This figure places a mortgage of 200,000 euros relatively close to the current average amount and allows for sizing the previous simulations. With a loan of that amount at 3% and for 25 years, the indicative monthly payment would be approximately 948 euros.

The mortgaged amount does not necessarily equate to the price of the home. The loan may only finance part of the operation, while the buyer contributes their own resources to cover the rest of the price and associated expenses.

What these simulations include and do not include

All the previous amounts are indicative mathematical examples, calculated using constant monthly payments and assuming that the indicated rate remains unchanged throughout the period.

The figures only reflect the repayment of capital and interest. They do not include possible commissions, insurance, linked products, taxes, appraisal, or other costs related to taking out a mortgage or to the purchase of a home.

In a variable mortgage, it would also not be correct to project the same monthly payment over 20, 25, or 30 years, because the interest may change during the reviews. That is why the scenarios of 2.5%, 3%, and 3.5% serve to compare the effect of different rates, not to anticipate the future evolution of a variable mortgage.