Purpose- The increase in volatility in exchange rates in the last 5 years has increased the level of exchange risk for the Turkish banking sector, whose liabilities are mainly composed of foreign currency funds. To manage the currency risk, the tendency towards derivative financial instruments has increased and swap transactions have a share of 85% in the total derivatives’ portfolio as of the end of 2019, according to BRSA data. Studies in the literature on the subject of the Turkish banking sector focus on the effect of derivative financial instruments on banks' risk level. In studies on the effect of derivative transactions on profitability, it is seen that the derivative transaction’s portfolio is evaluated as a whole. In this context, taking into account that swap transactions are carried out to make a profit in addition to being a risk management tool, the purpose of the study is to determine the causality between profitability and swap transactions recorded by banks within the scope of Derivative Transactions for Trading Purposes. Methodology- In the research, the data of the first 8 private banks according to balance sheet size were analyzed. State-owned banks were excluded from the study due to their capital structures, working principles, competition conditions, and their functions being relatively different from private banks. The variables to be analyzed in the study are net profit and swap transaction volume data that banks account for under Derivative Transactions for Trading Purposes by IFRS 9. The data were obtained from financial statements and audit reports disclosed to the public by banks. These data are for 20 quarters covering the years 2015-2019. In this context, short and long-term causality analysis was performed between swap volume and net profit. It has been determined whether the causality relationship between the variables is one-way or two-way. Panel unit root tests, Johansen cointegration test, Wald test, and Granger causality test were performed respectively to achieve the purpose of the study. Findings- Cointegration between swap volume and net profit of banks included in the analysis has been determined. For this reason, short and long-term causality analysis was performed by applying the Vector Error Correction Model (VECM). As a result of the causality test, it was concluded that there is long-term bidirectional causality among the variables and one-sided causality in the short-term. Short-term causality is from swap volume to net profit. Conclusion- As a result of the analysis of the quarterly swap volume and net profit data of the eight banks operating in the Turkish banking sector in terms of balance sheet size for the period 2015-2019, it is understood that both variables affect each other in the long-term. In the short run, the causality is one-sided and it is concluded that the swap volume affects the net profit. It is believed that a study on the effect of currency swaps, which has a significant share in the swap portfolio, on profitability will be useful in the studies to be carried out in the following period.
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