A $285,000 payment for the fine had been made, he said.
Reiss was arrested three weeks after Mahmoud Ahmadinejad was re-elected as president in a disputed June 12 vote.
Reiss was released on bail after a month and a half in custody but only on condition that she remained at the French Embassy in Tehran until her trial was over.
She was accused of taking part in a Western plot to destabilise the Iranian government and was put on trial in August charged with acting against national security.
Four court appearances
A judgement in the case had been expected in January, after Reiss had made four court appearances, but the verdict was put off.
Her case has raised tensions between France and Iran, with Paris saying that Reiss was innocent and demanding her immediate release.
Reiss was arrested in Tehran in July as she prepared to leave Iran after working at the University of Isfahan for five months.
She was among thousands of people detained over widespread post-election unrest, which was sparked after defeated presidential candidates said that the polls had been rigged.
The government has denied the claims.