Iran will formally confirm next week that it will allow snap international inspections of its nuclear facilities.
Tehran denies it has a nuclear weapons programme
Tehran will also indicate when it will suspend uranium enrichment, said Iran's head of National Security Council.
Hassan Rohani was speaking after talks in Vienna with the Director General of the International Atomic Energy Agency (IAEA), Mohamed ElBaradei.
Iran faces intense international pressure to prove it is not developing nuclear weapons, as the US alleges.
The IAEA's board of governors meets on 20 November to consider Iran's compliance with treaty obligations.
Last week, Tehran gave the IAEA a "comprehensive" declaration on its nuclear programme.
But IAEA inspectors could take some time longer to check out the information which Iran has provided.
Mr Rohani said Tehran would send letters to the IAEA confirming the agreements - reached with three European ministers last month.
These include a 'letter of intent' from Iran to serve formal notice of its intention to sign the additional protocol to the nuclear Non-Proliferation Treaty.
ElBaradei's inspectors are verifying Iranian claims on the ground
Tehran has already agreed to sign the additional protocol allowing UN inspectors to carry out spot checks of Iranian facilities.
Iran will also indicate when it is going to implement the deal to stop uranium enrichment next week, Mr Rohani told reporters after the talks.
Mr ElBaradei described both announcements as "positive" steps.
The IAEA chief is is preparing a key report on Tehran's nuclear activities to be circulated before the board's meeting.
Iran hopes the announcements should be enough to ensure that the IAEA board meeting resists American pressures to have Iran referred to the UN Security Council for breaching its nuclear obligations, says the BBC's Tehran correspondent Jim Muir.
IAEA inspectors are understood to be focusing on processes of uranium conversion, laser enrichment and centrifuges where traces of highly-enriched weapons-grade uranium were found earlier.