The nuclear monitoring body made the announcement in its restricted quarterly report on Wednesday.
The agency also said Iran’s stockpile of low-enriched uranium has gone up over the past three months.
Tehran "has started removing centrifuges and related infrastructure" at both the Natanz and Fordo enrichment facilities, said the IAEA, Press TV reported.
On July 14, Iran and the IAEA signed a Road-map regarding the Islamic Republic’s nuclear work in the Austrian capital city of Vienna.
The agreement was reached on the same day Iran and the Group 5+1 (Russia, China, the US, Britain, France and Germany – also known as P5+1 or E3+3) finalized the text of the JCPOA in Vienna.
As part of the Road-map, the IAEA is required to finish its investigations on Iran’s nuclear activities and submit a report to the agency’s Board of Governors by December 15.
The UN nuclear monitoring agency has confirmed in its regular reports that Tehran has been complying with the terms of its agreement with the IAEA, required for the implementation of JCPOA.
Under the JCPOA, limits will be put on Iran’s nuclear activities in exchange for, among other things, the removal of all economic and financial bans against Tehran.