The IAEA promotes peaceful uses of atomic energy while at the same time overseeing efforts to detect and prevent possible nuclear weapons proliferation.
The IAEA said Iran had stayed within the caps on uranium enrichment levels, enriched uranium stocks and other items.
Ministers from Britain, China, France, Germany and Russia met their Iranian counterpart in Vienna for the first time since US President Donald Trump left a nuclear accord in May.
The IAEA produced a report this month that strongly suggested Iran had a secret nuclear weapons programme.
John Kerry and his Iranian counterpart Mohammad Javad Zarif will meet on 15 March.
The IAEA said more work was still needed for the implementation of a series of nuclear transparency steps.
There's been a potential breakthrough in the investigation into Tehran’s atomic activities.
UN inspectors are expected to visit the uranium mine by 29 January.
The increased transparency is the result of a thaw in relations between Iran and the West.
