According to the Swiss Life Hypoindex, which tracks average mortgage interest rates offered by banks in the Czech Republic, the rate climbed to 5.42% in August 2026 - the highest in two years, and rising for a fifth consecutive month. Three-year fixed rates, meanwhile, were most favourably priced around 5.02% in July 2026. For anyone planning to buy their own home or refinance an existing mortgage this year, it is worth understanding what actually determines the specific rate you are offered - and why the offer for two different applicants can differ significantly.
Nominal rate vs. APR - not the same thing
The nominal interest rate is the headline figure a bank advertises, but the real cost of the loan is only reflected in the APR (annual percentage rate of charge). APR includes, on top of interest, the fees associated with the loan - application assessment, property valuation, land registry deposit, and other one-off costs spread over the whole repayment period. The gap between the nominal rate and the APR on a mortgage is typically a few tenths of a percentage point, but on shorter loans or smaller amounts it can be noticeably larger. When comparing offers, always look at the APR, not just the nominal rate from the advert.
Rate fixation: how long the rate is locked in
Fixation determines how long your rate stays unchanged regardless of what happens in the market. A shorter fixation (1-3 years) is usually somewhat cheaper, but carries the risk that when you renegotiate, you may face less favourable terms if rates have risen in the meantime. A longer fixation (7-10 years) gives you certainty of an unchanged repayment for longer, but that certainty usually comes at the cost of a higher rate. Your choice of fixation period should match your own expectations about rate movements and your risk tolerance, not just the lowest number currently on offer.
LTV: how much you cover with your own funds
LTV (loan-to-value, the ratio of the loan amount to the property value) is one of the strongest factors influencing the rate you are offered. The lower the LTV - meaning the larger the share of the purchase price you cover with your own savings - the lower the rate a bank will typically offer, since the loan represents less risk for them. Banks commonly finance 80 to 90% of the property value; some offer higher LTV for younger applicants up to a certain age, usually at the cost of a rate premium.
The representative example: what to look at
Consumer credit law requires banks to state a representative example - a specific calculation with a given loan amount, term, rate, monthly instalment, and total amount repaid. This example is valuable because it shows how the rate and fees translate into real numbers, but remember it is an example built on specific assumptions chosen by the bank - your actual offer may differ depending on your creditworthiness, loan amount, and chosen fixation. Never treat the representative example as a guaranteed offer for your specific situation.
What else plays a role
Besides LTV and fixation, your specific offer is also shaped by your creditworthiness (income, existing liabilities, repayment history), the purpose of the loan (financing your own home is usually favoured over an investment property), and whether you take out the bank's add-on products alongside the mortgage - life insurance, a current account with a regular income credited to it, or a payment card. Declining these add-on products can mean a rate premium at some banks, which needs to be factored into the total cost comparison, not just the bare rate.
How to approach your choice
Before settling on a particular bank, compare not just the nominal rate but also the APR, processing fees, and early-repayment terms across several offers at once. You can find a current overview of mortgage offers on BankSorter's mortgage comparison.
Summary
The mortgage rate a bank ultimately offers you is the result of several factors working together - LTV, fixation length, your creditworthiness, and the loan's purpose - not just the current state of the market. The Hypoindex average is a useful reference point, but your specific offer can deviate from it significantly in either direction. Spend the time comparing APR across several banks, not just the nominal rate from the first advert you come across.