Turkey’s Borrowing Costs Soar as Crisis Enters New Phase

The lira’s dizzying fall is amplifying concerns among investors and economists that Turkey’s heavily dollarized financial system could be headed for a banking crisis. The lira has lost more than half its value this year, wiping out much of Turks’ savings and triggering sporadic protests.

“A huge crisis, a financial crisis et cetera, these are all possible, but we don’t know what the timeline is,” said Mustafa Sönmez, a Turkish economist.

After Turkey’s markets closed, Mr. Erdogan said that the government will introduce a new program to protect lira deposits from currency fluctuations. It wasn’t clear how this program would work or how it would be paid for.

The Turkish lira rallied against the dollar, making up for earlier losses. Monday’s announcement showed the Erdogan administration is finally taking steps to address the country’s issues, said Timothy Ash, senior emerging-market sovereign strategist at BlueBay Asset Management. At the same time, the plan suggested will create a huge amount of uncertainty and fiscal risk.

“It is an incredibly complex scheme to get around the fact that Erdogan doesn’t want to use interest rates to manage the economy,” he said.

Of particular concern earlier Monday were the rise in Turkey’s borrowing costs in U.S. dollars.

Yields on U.S.-dollar denominated Turkish bonds rose Monday as investors sold off their holdings.

The yield on a $1 billion Turkish dollar bond maturing in March 2022 rose to 7.3% Monday from 5.4% Friday and up from 3.1% at the start of the year, according to Tradeweb. The yield on a $2.25 billion Turkish dollar bond maturing in January 2031 ticked up to 8.26% Monday from 7.8% Friday.

While Turkey is a modest issuer of U.S. dollar bonds, much of the issuance is held by Turkish banks and the rise in borrowing costs could reflect difficulties in the financial system to get a hold of dollars demanded by depositors or to pay off debts.

More than half of Turkish banking deposits are in foreign currencies, according to central bank data. Turkish banks have in the past lent foreign currencies to the central bank, which it has sold to steady the lira. A sudden rush by Turkish savers and businesses to redeem foreign-currency deposits or move them out of the country could cause the financial system to buckle.

The central bank has intervened five times this month to stem the rate of decline in the lira, burning through foreign-currency reserves that are already low. Economists estimate that Turkey’s central bank has more foreign-currency liabilities than assets.

The drastic decline in the lira, low foreign-currency reserves and worries over financial stability may be prompting some foreign bondholders to sell as well.

“They’re burning through what they have left in reserves. That’s money you can’t use to pay back your debts,” said Daniel Wood, a portfolio manager at William Blair Investment Management.

Turkey’s stock market was twice forced to stop trading Monday to prevent further losses. Investors and ordinary Turks have been rushing to trade lira for other currencies and gold during the crisis.

The lira’s collapse is the result of four interest rate cuts in the last four months, all demanded by Mr. Erdogan, economists say. After firing a series of central bank governors and top finance officials, Mr. Erdogan has pressured the bank into carrying out the rate cuts despite rising inflation.

“They keep saying we cut the rates. Do not expect anything else from me. As a Muslim, I will continue doing whatever the God’s words necessitate,” said Mr. Erdogan on Sunday.

Mr. Erdogan has repeatedly cited his religious objections to high interest rates alongside an economic vision that calls for a depreciated lira to encourage exports and productive industry.

Mr. Erdogan’s comments were designed to shore up support among his conservative, religious base in Turkey after months in which his ratings have been falling in opinion polls due to the economic crisis, analysts said.

“His target is to consolidate his supporters by saying that he is a leader, very decisive and very religious,” said Mr. Sönmez.

Tensions are rising between the government and Turkey’s normally politically quiet business community.

The country’s largest business association, TUSIAD, said over the weekend that Mr. Erdogan’s program was imperiling the economy as a whole. The group’s chairman also blamed the government for rapid inflation and imploding purchasing power.

“An environment of distrust and instability has been created,“ the organization said. “Even exports, expected to benefit the most from this, have been harmed under this environment,” it said.

Mr. Erdogan shot back at the industry group in his speech on Sunday.

“I am speaking to you. You have only one job and that is investment, employment and growth. Do not attempt to look for different ways and versions to attack the government,” he said, addressing the group directly.

Another measure of the concerns over Turkey’s economic policy are the skyrocketing costs to insure against a possible debt default.

The cost of insuring against default on $10,000 of five-year Turkish dollar-denominated bonds using derivatives contracts called credit default swaps climbed to about $584 a year Monday, from about $380 a year at the end of June, according to FactSet.

Investors will be waiting to see further plan details and if the Turkish population ultimately believes in the administration’s ability to manage the country’s problems, including one of the worst currency crises in recent history, said Mr. Ash.

“I’ve never seen in 30 years such swings in the currency,” he said. “Absolutely unbelievable.”

—Sebastian Pellejero contributed to this article.

Write to Jared Malsin at jared.malsin@wsj.com and Caitlin Ostroff at caitlin.ostroff@wsj.com