ISTANBUL--Moody's Investors Service said Monday Turkey's monetary tightening is credit negative for banks, as it expects the central bank's measures to constrain banks' revenue generation and profitability.

"We expect the interest rate increase to result in higher domestic funding costs and a slowdown in Turkey's (Baa3 stable) economic growth, which will pressure banks' profitability and asset quality during 2014, a credit negative," Irakli Pipia, vice president-senior analyst at Moody's, said in his report.

Last week, the central bank aggressively raised its interest rates to shore up the lira and ease inflationary pressures. The central bank more than doubled its one-week benchmark repo rate to 10% from an all-time low of 4.5% and also increased its overnight lending rate to 12% from 7.75% and overnight borrowing rate to 8% from 3.5%.

"These measures were aimed at alleviating the Turkish currency's and capital markets' financial stress and may stem some of the extreme volatility, which was causing significant stress for corporate borrowers and importers," Moody's said.

Moody's said it expects tighter monetary policy to increase the downside risks to its 3% economic growth forecast for 2014 and, hence, the operating environment for Turkish banks.

"We expect that downside risks to Turkey's economic growth from the sharp monetary tightening will harm the credit quality of existing loans and limit opportunities for lending growth. However, since 2008, Turkish banks' profitability indicators (net income over risk-weighted assets) have been among the strongest versus selected regional and global peers," Moody's said.

Turkey is rated BBB- by Moody's, the firm's lowest investment-grade level.

Write to Yeliz Candemir at yeliz.candemir@wsj.com

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