Poland's financial authorities have announced a lengthy postponement of the phase-out of the Wibor interbank benchmark for existing loan contracts, extending the deadline to the end of 2036. The decision, disclosed Monday by index administrator GPW Benchmark together with the Polish financial regulator, follows objections from commercial lenders about the risks tied to an accelerated transition.
What changed
Under the revised timetable, banks will have roughly ten years to convert loans currently tied to Wibor to the new Polstr reference rate. Regulators still require that new local-currency loan agreements be offered using Polstr beginning at the end of next year. The original plan envisioned phasing out Wibor by the end of 2027 through a Finance Ministry decree that would compel the switch to Polstr.
Rationale given by authorities and industry
Officials cited concerns from commercial lenders about an abrupt conversion, and the extended horizon is intended to limit potential legal difficulties that could arise from mandating a wholesale replacement of the benchmark. The decision reflects an expectation that a substantial share of Wibor-based loans will be repaid naturally over the next decade, reducing the stock of contracts that would otherwise require conversion.
The country’s banking association welcomed the move, saying it allows firms time to prepare existing clients for the change and lowers legal and operational risks that an immediate or forced conversion might create. The association indicated that most outstanding loans will run off under the old benchmark rather than being converted before maturity.
Scale and mechanics
Wibor is a survey-based rate that measures the interest at which Polish banks say they are willing to lend to each other, commonly for three- or six-month tenors. By contrast, Polstr is constructed from actual overnight borrowing costs and can be compounded into monthly rates to smooth volatility. At present, Polstr sits about 40 basis points below Wibor.
Wibor currently underpins more than c600 billion ($698 billion) of loans, derivatives and bonds, making the transition consequential for a wide range of financial contracts. The move to Polstr forms part of a broader effort in Europe to replace declaration-based benchmarks with rates grounded in actual transaction data.
What remains fixed
Despite the extended phase-out period for existing loans, lenders are required to offer new local-currency loans using Polstr from the end of next year. Beyond that mandate, regulators and the index administrator have not announced additional changes to enforcement or implementation mechanisms in the publicly disclosed decision.
Key points
- Poland postponed the mandatory conversion of Wibor for existing loans until the end of 2036, giving banks a decade to migrate legacy contracts.
- New local-currency lending must use the Polstr rate starting at the end of next year, while the original plan targeted the end of 2027 for a Wibor phase-out.
- The decision affects banking, loan markets, and capital markets, since Wibor currently underlies more than c600 billion of loans, bonds and derivatives.
Risks and uncertainties
- Potential legal complications if authorities had enforced an immediate mandatory conversion - a concern for banks and borrowers in the loan market.
- Operational and legal risks tied to a rapid transition that the banking sector sought to avoid, affecting bank operations and client relationships.
- Valuation and basis risk stemming from the roughly 40 basis point difference between Polstr and Wibor, relevant for loans, derivatives and bond contracts.