When you see two offers tagged „interest rate 9%", one can come out almost twice as expensive as the other. The deciding number is RRSO — the Polish APR. It takes the nominal rate, adds the arrangement fee, admin charges and any mandatory insurance, and pulls them all into a single annual figure.
RRSO is calculated using the formula in Annex 4 of the Polish consumer credit law. Every regulated institution has to compute it the same way, so the comparison is honest.
A worked example that makes it click
Loan A: nominal rate 8%, arrangement fee 5%. Loan B: nominal rate 10%, no fee.
On 30 000 PLN over 48 months, the RRSO of loan A lands above 13%; the RRSO of B sits near 10.5%. The „lower" headline rate turned out to be 2.5 points more expensive per year. This happens all the time.
What RRSO does not tell you
RRSO does not include optional insurance (life, job-loss cover) and is calculated assuming „no late payments". Miss a payment once and the real cost goes up. Sign an optional policy at the end of the application and it sits outside the RRSO you saw at the start. Ask for the cost breakdown in writing before you sign.
How we sort by it
Every offer in the comparison is sorted from lowest to highest RRSO. Cheapest first, no paid placement. If you want to sort by amount, term or rating, the selector is in the top right.