The lira rose against the dollar after the bank announced its decision, which investors said was designed to reassure investors after the recent sell-off.
Turkey is 18 months into an economic stabilisation programme that has sought to squash runaway inflation caused by the ultra-low interest rate policy previously favoured by Erdoğan.
Turkish inflation last month fell more than expected to 38 per cent. The bank is targeting 24 per cent by the end of the year.
Turkey is actually trying to infuse life in the already dead currency.