Okur, Faith2026-09-012026-09-0120261305-5577http://dx.doi.org/10.17233/sosyoekonomi.2026.03.24https://hdl.handle.net/20.500.12403/8469This study examines the relationship between inflation and interest rates in T & uuml;rkiye during the 2015-2024 period, with a specific focus on the monetary policy shift implemented in September 2021. Using the ARDL model, Toda-Yamamoto causality test, and structural break analysis, the findings reveal a reversal in the inflation-interest rate relationship after the policy change. The results suggest that the observed dynamics may reflect not a temporary anomaly but a structural transformation aligned with the Neo-Fisher effect, offering critical insights into the effectiveness of monetary policy under changing regimes.trinfo:eu-repo/semantics/openAccessInflationInterest RateMonetary PolicyStructural BreakArdlNeo-Fisher EffectArticle346951353210.17233/sosyoekonomi.2026.03.24WOS:001843399100024Q4