Ahmad, who runs an advertising agency in a busy commercial district of Tehran, has given up trying to get a business loan from any of the dozens of lenders just a short walk from his office.
Finding a bank in Iran is easy. The challenge is finding one that will lend at affordable rates, or even lend at all. The central bank’s rates for businesses are set as high as 18%. Ahmad, who employs about 20 people, says his bank told him that his company’s healthy accounts put him in a good position for a loan. But when he applied, he was refused and given excuses, says Ahmad, who asked not to be to be identified by his full name because of concerns in Iran about speaking to foreign media.
Money is harder to come by in a struggling economy, and Ahmad’s experience reflects the financial problems in a country that three years ago looked to be on the cusp of prosperity after a rapprochement with the US and Europe. Now it’s struggling with its own version of the credit crunch that crippled Western banks a decade ago. With the deal on its nuclear programme failing to deliver promised gains, experts in Tehran say a banking crisis poses a bigger economic threat to the country than any decision by Donald Trump to rip up the agreement.
Years of poor regulation since the financial-services market was opened to private lenders in 2004 allowed banks to proliferate with little oversight. Many were used as vehicles to fund populist policies under former president Mahmoud Ahmadinejad, such as investments in social housing projects. The amount of loans at risk of default soared and liquidity was squeezed after oil prices began tumbling in 2014 and foreign investment failed to materialise. 
“Solving the banking crisis is the priority for us now, our No 1 problem, and we have to resolve it,” says Teymur Rahmani, professor of economics at the University of Tehran. “If we want to fix the situation, we have to be prepared to absorb some costs and damage.”
The solutions aren’t clear. The industry is largely cut off from the outside world and relies on the Central Bank of Iran to pump money into the system. Parviz Aghili-Kermani, board member and managing director of privately owned Middle East Bank Co, told an audience of investors and executives in Switzerland in October that it could cost the country as much as $200bn to overhaul the banking system, roughly equal to about half the economy. Iran can’t afford that, he said.
A fix would also require several banks to merge with healthier ones, or, he suggested, to be done away with altogether. 
Bankers in Iran worry that healthy institutions would be destroyed by taking on a big bank with toxic assets. Should the worst of them be allowed to fail, there could be civil unrest. 
“Iranians haven’t been through a banking crisis before, and they don’t know how it plays out,” says Charles Robertson, global chief economist at Renaissance Capital in London. “Once you’ve been through a banking crisis, you then spend the next 20 years worrying about a banking crisis.”
Many of the country’s 35 licensed financial institutions are trying to repair their books after offering deposit rates of as high as 22% in 2014 to lure money when oil prices were high. (Although they carry rates, loans and deposits are structured to comply with the Shariah ban on interest.) 
The assets underpinning the loans, such as office blocks and shopping malls, have dropped in value in subsequent years. The central bank’s latest figures, published in January, put bad loans at $26.6bn. That’s about 11% of total lending, down from 15% when President Hassan Rouhani came to power in 2013 and sought to open up the economy.
Yet the problem could be bigger than it looks. The central bank is limited in its ability to pursue a chunk of the unpaid debt because it’s owed by state institutions and powerful companies and individuals connected to them, one Western senior diplomat says. Saderat Bank, which says it runs Iran’s largest banking network, had a loss equal to about $1.5bn for the nine months ended in December, according to a financial statement it posted on the Tehran Stock Exchange’s website.