ISTANBUL- Turkey's central bank unexpectedly cut its policy rate by 100 basis points to 18% on Thursday, delivering stimulus long sought by President Tayyip Erdogan despite high inflation, and sending the lira to near a record low.

The central bank was widely expected to hold interest rates steady at 19%, where they had been since March, given inflation reached 19.25% last month. Only two of 17 economists polled by Reuters had predicted a cut.

But Governor Sahap Kavcioglu - whom Erdogan installed at the bank in March - has sounded more dovish in recent weeks, paving the way for Turkey's first monetary easing since May 2020 and ending a tightening cycle that began 12 months ago.

Kavcioglu had begun emphasising core inflation, which stood below 17% in August, and had said policy was tight enough to cool price rises in the fourth quarter.

The bank's policy committee said a rate cut was "needed" because of the lower core price measures - which strip out food and some other goods - as well as shocks to supply in the wake of pandemic measures.

The recent rises in inflation "are due to transitory factors", it said. "The tightness in monetary stance has started to have a higher than envisaged contradictory effect on commercial loans."

The lira fell as much as 1.5% and stood at 8.76 against the dollar at 1123 GMT, near an all-time low of 8.88 set in June. Depreciation brings further inflation in Turkey due to imports priced in hard currencies.

"Obviously the currency has weakened and it will weaken further, but I don't think you are going to see it blow up completely because there was some positioning for this," said Peter Kisler, emerging markets portfolio manager at Trium Capital.

The central bank's dovish pivot this month had prompted analysts to warn of a "policy mistake" if cuts come too soon, though most predicted they would come before year end. Investor jitters drove a more than 4% currency devaluation this month.

Foreign investors have dumped Turkish assets in recent years due in part to concerns over the political independence of the central bank, given Erdogan ousted its last three governors over a 20-month span due to policy disagreements.

A self-described "enemy" of interest rates, Erdogan said in June he spoke to Kavcioglu about the need for a rate cut in August. Last month, he said "we will start to see a fall in rates". 

(Reporting by Ali Kucukgocmen and Daren Butler; Additional reporting by Marc Jones in London; Editing by Jonathan Spicer and Catherine Evans) ((ali.kucukgocmen@thomsonreuters.com , @alikucukgocmen; +905319306206; Reuters Messaging: Reuters Messaging: ali.kucukgocmen.thomsonreuters.com@reuters.net))