Following the judgment of the Court of Justice of the European Union in Case C-471/24, the narrative promoted by numerous entities encouraging borrowers on a mass scale to challenge the WIBOR benchmark has come up against the realities of the legal framework.

The latest issue of the quarterly journal Bezpieczny Bank (No. 1(102), 2026), published by the Bank Guarantee Fund (BFG), features one of the first case notes endorsing the judgment. Its authors are Professor Krzysztof Koźmiński, Managing Partner at Jabłoński Koźmiński & Partners and Professor at the University of Warsaw, and Patryk Grochowski, LL.M., trainee attorney-at-law and Associate.

For more than thirty years, WIBOR has served as a standard market benchmark reflecting the time value of money. Attempts to artificially redefine its role through litigation have now lost some of their most prominent arguments.

The JKLAW experts directly address and dispel a number of widely circulated misconceptions surrounding PLN-denominated loans. Why can – and should – ordinary courts not challenge the WIBOR benchmark?

We invite you to read the full analysis, in which the authors examine in detail the relationship between EU consumer law and the stability of the Polish banking sector as a whole.