Iranians will demand their government spend a windfall from the lifting of economic sanctions on improving the quality of life at home, limiting the degree to which a future nuclear deal could fund Tehran's allies on Middle East battlefields.
Since 2012, Iran has given support worth billions of dollars to regional allies, funding and arming mainly fellow Shi'ite Muslims in conflicts that have taken on a sectarian dimension. Its enemies say lifting sanctions will provide it with the means to do even more.
Within months of financial sanctions being lifted, Iran will be able to collect debts from overseas banks that may exceed $100 billion, mostly from oil importers whose payments have been blocked, diplomats and analysts said.
But with the budget strained by last year's heavy fall in oil prices, and public expectations of improved socio-economic conditions in the event of a deal, the authorities will face pressure to invest new funds at home.
"The idea that Iran is going to have its pockets full of cash that it can use for discretionary purposes, I think is exaggerated," Charles Hollis, managing director for the Middle East at FTI Consulting, said.