Afghanistan's gross domestic product could see a contraction of up to 30% following the Taliban takeover, the IMF said in its latest regional economic report.
Jihad Azour, director of the IMF's Middle East and Central Asia department, said the country's situation was deteriorating, even before Kabul fell.
The report also noted that non-humanitarian aid has been halted, foreign assets mostly frozen and Afghan banks have been crippled by cash shortages after the Taliban returned to power.
"These shocks could cause a 20–30 percent output contraction, with falling imports, a depreciating Afghani, and accelerating inflation," the report said.
"The resulting drop in living standards threatens to push millions into poverty and could lead to a humanitarian crisis."
Jihad Azour, CNBC's Hadley Gamble
East, Central Asia, Kabul