Slovakia mortgage calculator 2026

How to calculate a mortgage payment step by step

The calculator does the whole thing at once, but if you want to check the payment by hand, work through it in this order:

• Work out the monthly rate: divide the annual rate by 12 (e.g. 3.9% a year = 0.325% a month).
• Count the payments: term in years × 12 (30 years = 360 payments).
• Plug them into the annuity formula M = P × i / (1 − (1 + i)⁻ⁿ), where P is the loan amount.
• Total interest is the monthly payment × number of payments − the loan amount.

How much you overpay and how the interest/principal split shifts

The annuity payment stays the same throughout the fixed-rate period, but what it is made of changes. In the early years most of the money goes on interest and the balance falls slowly; towards the end it is the other way round. That is why after five years of payments the debt has shrunk far less than the number of payments would suggest.

The amortisation schedule shows this year by year: how much of each year's payments went on interest, how much on principal, and what balance remains. Total interest is the sum of all interest over the full term and on longer terms it can reach half the amount borrowed.

How the term changes both the payment and total interest

Extending the term is the quickest way to cut the monthly payment — and also the change that raises total interest the most. Shortening the term does the opposite: the payment rises but you save on interest.

The effect is not linear. Going from 20 to 25 years lowers the payment more than going from 25 to 30, while interest keeps climbing steadily. Try 20, 25 and 30 years at the same rate in the calculator and compare the total interest row — the gap usually runs to tens of thousands of euros.

The fixed-rate period and what happens when it ends

The fixed-rate period is the time during which the bank cannot change your interest rate — usually 3, 5 or 10 years. A longer fix tends to cost slightly more but protects you against rate rises; a shorter one is cheaper and lets you remortgage sooner.

A few months before the fix ends the bank sends a new rate offer. It is not binding — on the anniversary of the fix you can remortgage to another bank without an early repayment penalty. Enter the quoted rate in the calculator to see straight away how the payment and remaining interest change.

LTV, creditworthiness and early repayment

The rate is not the same for everyone. LTV — the loan as a share of the property value — matters most: Slovak banks normally lend up to 80% of value, and higher LTV is only available on stricter terms and usually at a higher rate. Creditworthiness, the length of the fix and add-ons such as insurance or an active current account also count.

Slovak law allows early repayment or an overpayment free of charge on the anniversary of the fixed-rate period, and also up to 30% of the principal per year; outside those cases the bank may charge a fee under the loan agreement. To model an overpayment, reduce the loan amount by the sum repaid and keep the original term.

How is the monthly mortgage payment calculated?

On an annuity basis, using M = P × i / (1 − (1+i)⁻ⁿ). The payment stays constant; only the interest/principal split within it changes.

What is total interest?

The difference between the sum of all payments over the full term and the original loan amount.

Why do bank rates differ from the calculator?

The listed rates are a snapshot as of the date shown and typically apply at up to 80% LTV. The actual offer depends on the applicant's creditworthiness.

What does a fixed-rate period mean?

The period during which the interest rate doesn't change (e.g. 3 or 5 years). After it ends, the bank offers a new rate.

How much can I borrow on my income?

That's answered by the separate mortgage affordability calculator, which applies the Slovak NBS limits.

Why does the balance fall so slowly in the early years?

Interest is always charged on the outstanding balance, which is highest at the start. Most of the payment therefore goes on interest at first, and only gradually does the split tip towards principal — the amortisation schedule shows the progression.

Is a shorter or longer term better?

A longer term lowers the monthly payment but raises total interest. A shorter term does the reverse. Compare 20, 25 and 30 years at the same rate in the calculator and pick the payment you can comfortably afford.

What happens when the fixed-rate period ends?

The bank sends a new rate offer, usually a few months in advance. It isn't binding — on the anniversary of the fix you can remortgage to another bank without an early repayment penalty.

How does LTV affect the interest rate?

LTV is the loan as a share of the property value. Slovak banks normally lend up to 80% of value, and a lower LTV generally means a lower rate; lending above 80% is only available on stricter terms.

When can I repay the mortgage early without a fee?

Under Slovak law, on the anniversary of the fixed-rate period and for overpayments of up to 30% of the principal per year. Otherwise the bank may charge a fee set out in the loan agreement.