In 2025, the Polish Zloty (PLN) has come under intense pressure in the foreign exchange market, driven largely by the National Bank of Poland's (NBP) persistent loose monetary policy. According to Commerzbank's latest analysis, the bank's bias toward supporting growth rather than curbing inflation has eroded the appeal of Polish assets, sending international capital toward higher-yielding economies and creating sustained depreciation pressure on the Zloty.
NBP has remained cautious about rate hikes since 2024, leaving real rates well below inflation for an extended period and widening the policy gap with major central banks such as the ECB and the Fed. That expanding differential has become the central rationale for markets taking a bearish stance on the Zloty. Historical data show a significant positive correlation between the PLN's movements against the euro (EUR/PLN) and the dollar (USD/PLN) and interest rate spreads.
This policy orientation is not an isolated decision, but a response to the complex backdrop of Poland’s post-pandemic economic recovery—including energy price volatility, tight labor markets, and fears of recession. Although NBP's legal mandate is to ensure price stability, recent statements have focused on avoiding the negative consequences of over-tightening. That balancing act has left the Zloty vulnerable amid a convergence of domestic and external pressures.
Deutsche Bank noted that it is not just interest rate differentials but also the layering of market expectations and investor psychology that are weighing on the Zloty. In the mid-2010s, NBP maintained a prolonged dovish stance, during which the currency went through years of weakness. Institutional investors and quantitative trading models now incorporate that historical pattern, meaning that once the market settles on a consensus of “persistently easy policy,” speculative selling can intensify even without an actual rate cut, creating a self-reinforcing depreciation cycle. In this environment, the central bank’s credibility and policy transparency have become key variables influencing the currency's trajectory.