The 4-member delegation for talks on July 25 and 26 will include an official from Reserve Bank of India (RBI) as well as Oil Ministry, senior official said.
"The agenda for talks is oil payment and other bilateral and economic issues," he said.
The delegation will leave for Tehran on July 24.
Mehrishi chaired a meeting on the Iranian oil issue today which was attended by officials of RBI and Oil Ministry.
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as to avoid a run on the rupee.
The official said banking channels as well as payment schedule is likely to be discussed during the two day talks.
Since February 2013, Indian refiners like Essar Oil and Mangalore Refinery and Petrochemicals (MRPL) have been paying 45 per cent of payment due on purchase of crude oil from Iran in rupees. The remaining has been accumulating, pending finalisation of a payment mechanism.
India is keen that Iran continue to give Indian refiners favourable terms - like insurance and shipping as well as 90-day credit period, on oil it sells to India, its second biggest customer after China.
Under US pressure, New Delhi has restricted import of Iranian oil at 11 million tonnes in past two fiscals. But with easing of sanctions, it will look at increasing imports provided Tehran continues to extend the fiscal terms, he said.
Indian firms have so far shied away from investing in Iran for the fear of being sanctioned by the US and Europe. The same was deterring New Delhi from claiming rights to invest nearly USD 7 billion in the biggest gas discovery ever made by an Indian firm abroad.
But with prospects of sanctions easing, India is making a renewed pitch for rights to develop 12.8 trillion cubic feet of gas reserves ONGC Videsh Ltd had found in 2008.
The official said the government expects payment channels to open soon and Iran making a demand for clearing of past dues.