Iran and the five permanent members of the UN Security Council plus Germany, also known as P5+1, signed an interim deal last November and are in discussions to secure a more permanent accord.
The target date for a final deal has been put back to November 24.
"We are entering with goodwill into further negotiations with the P5+1 group and we want to reach an agreement... but we are not willing to pay any price," ISNA news agency quoted Majid Takht-Ravanchi, one of Iran's main negotiators, as saying.
"If the other side also shows goodwill we can reach an agreement by November 24," he added.
By August 25 Tehran must also respond to the International Atomic Energy Agency (IAEA) on decade-old allegations of past nuclear weapons research.
Tehran denies that it wants nuclear weapons, insisting it is pursuing atomic energy purely for peaceful purposes.
By next Monday Tehran is to address claims made by the IAEA of the alleged use of what the Vienna-based watchdog calls "large-scale high explosives experimentation".
Last year's key deal partially froze Iran's nuclear activities in return for minor sanctions relief but the gap between the two sides remains large.
While some differences have been reconciled there are disagreements over how much uranium Iran would be allowed to enrich and on the lifting of international economic sanctions.
A new round of talks between the two sides, which is expected before the UN General Assembly starts on September 16.
A historic accord would see Iran scale back its nuclear activities and in return Tehran would be granted relief from painful UN and Western sanctions.
Such a deal could finally put an end to a standoff that has been threatening to escalate into a war since 2002.
"Negotiations will be held on the sidelines... and perhaps at the ministerial level, but first there will be bilateral negotiations with the group P5+1 whose date and place have not been fixed," Abbas Araqchi, another Iranian negotiator, said.
He added that the Iranian side was "serious" about securing an agreement.
"We are optimistic. We must try to solve problems with creative solutions."
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And what is ET trying to imply by putting up a picture that shows Iran's flag next to a missile for a nuclear deal news?! Had it been a defence day celebration in Iran, this was okay. ET needs to be neutral when reporting.
World is changing rapidly and Iran may try to call off the talks as the P5+1 keep increasing their demands. Already under sanctioned, Iran wait for few more years and things will turn into their favour anyway.
@csmann: Sanctions are forever as far as Iran is concerned. They will never be completely eliminated because the west is fundamentally opposed to the Iranian government. OTOH a foreign invasion can yet be avoided if you acquire nukes. Pakistan avoided a foreign invasion because we had nukes. Otherwise we would be in worse shape than Iraq or Afghanistan.
sanctions has already done that.
@reap: they know better than to do it.Sanctions will twist their arms to comply.
They should acquire nukes. It's the only thing that will stop them from falling victim to a US invasion.