Banks Ordered to Offer WIBOR Switch as Poland Phases Out Benchmark
Poland's Ministry of Finance has mandated that banks offer mortgage borrowers a choice to switch from WIBOR to a new benchmark rate or fixed-rate option within nine months, marking a major shift in how loan interest is calculated.
As of July 2026, Poland is accelerating the phase-out of WIBOR (Warsaw Interbank Offered Rate), the benchmark used by most variable-rate mortgage holders since the 1990s. The Ministry of Finance has given banks nine months to allow borrowers to switch from WIBOR-indexed loans to either a new reference rate or fixed-rate contracts.
Why This Matters
- WIBOR volatility: The rate swung from 0.25% in January 2021 to a peak of 7.43% in July 2022, causing mortgage payments to jump dramatically for millions of Poles.
- Legal pressure: Polish courts have begun receiving lawsuits from borrowers questioning WIBOR's transparency. The EU Court of Justice is expected to rule on WIBOR's legality in the first half of 2026.
- New benchmark: Poland is introducing WIRON (Warsaw Interest Rate Overnight), a newer, market-based rate designed to replace WIBOR.
What Mortgage Borrowers Should Know
If you hold a variable-rate mortgage linked to WIBOR in Poland, you will soon receive a formal notice from your bank with options to switch. Do not ignore it. Switching to a fixed rate now locks in current rates and eliminates future rate risk—a significant advantage if you expect rates to rise again. Fixed mortgages in Poland currently sit around 7.0–7.5% for five-year terms. Conversely, switching to WIRON keeps flexibility but ties you to the new benchmark, which may eventually be lower if central bank rates fall further. Banks must offer options; you are not obligated to switch immediately, but reviewing your choice early gives you time to understand the long-term cost difference. If you are a foreigner with a Polish mortgage or planning to refinance, this transition is a critical moment to lock in certainty or renegotiate terms with your lender.
Sources
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