Fluctuations in the real effective exchange rate and changes in the terms of trade can cause predictable or unpredictable changes in the overall economy. The most important consequences of these fluctuations and changes are the effects of regional or global economic crises on macroeconomic variables (employment, unemployment, inflation, GDP, balance of payments, foreign trade deficit). Anticipating the consequences of the dynamic effects of these changes is crucial for policymakers. This study analyzes the effects of changes in CPI-based real effective exchange rates and terms of trade on the trade deficit in 1994-2022. Since the impact of CPI-based real effective exchange rate and terms of trade changes on the trade deficit is likely to be asymmetric, the Nonlinear Auto Regressive Distributed Lag (NARDL) method is used in this study, and it is concluded that the factor that affects the trade deficit the most is the decline in the terms of trade. One of the most important reasons why the foreign trade deficit does not decrease at the desired level, even in periods of depreciation of the TL, is the decline in the country’s terms of trade.