Iranian Parliament Speaker Mohammad Baqer Qalibaf said that the temporary inspection agreement with the International Atomic Energy Agency was not extended beyond the three-month deadline.
Qalibaf said, during a parliament session, that the information and photos that were recorded during those months will not be handed over to the IAEA, and will remain in Iran's possession.
The announcement could further complicate talks between Iran and six major powers to revive the 2015 nuclear deal.
Three years ago, then US President Donald Trump withdrew from the agreement and reimposed sanctions on Tehran, and Iran responded by dismantling many of the agreement's restrictions on its nuclear program.
Last February, the International Atomic Energy Agency and Tehran concluded a three-month agreement to mitigate the impact of Iran's curtailment of cooperation with the agency.
The agreement allowed the continuation of monitoring some activities after they would have been stopped.
Data collection
Under the agreement, which was later extended for a month on May 24, data collection continues with an internal system and the International Atomic Energy Agency can only access it later.
On Friday, the agency demanded that Iran respond immediately on whether it would extend the deal, prompting an Iranian envoy to respond that Tehran was not obligated to answer.
Iran had previously said, on Wednesday, that the country's Supreme National Security Council would decide whether to extend the agreement after its expiration date.
Coinciding with the agency's request, US Secretary of State Anthony Blinken made it clear on Friday that any failure by Tehran to extend the agreement would be a source of serious concern for the broader negotiations.
The parties involved in the talks to revive the nuclear deal, which began in April in Vienna, said that there are major issues that still need to be resolved before the agreement is revived.