Ahmad Sheikhzadeh (C), a consultant to the Iranian mission to the United Nation, leaves Brooklyn Federal Court in New York, March 23, 2016.

A former consultant to Iran’s mission to the United Nations pleaded guilty on Monday to charges that he filed a false tax return substantially understating how much he was paid and conspired to violating a US sanctions law.

Ahmad Sheikhzadeh, 60, entered his plea in federal court in Brooklyn to charges that he conspired to violate the International Emergency Economic Powers Act and aided in the preparation of false individual income tax returns.

As part of a plea deal, Sheikhzadeh agreed to not appeal any sentence of 5-1/4 years in prison or less, said Steve Zissou, his attorney. Sheikhzadeh, who has also agreed to pay over $147,000, is scheduled to be sentenced on March 30.

Sheikhzadeh was arrested in March, two months after when world powers led by the United States and the European Union lifted crippling sanctions against Iran in return for curbs on Tehran’s nuclear ambitions.

Prosecutors said Sheikhzadeh had been a long-term consultant to Iran’s UN mission since 2008 and had been paid a regular cash salary, often through a someone employed there, which he deposited into a Citibank checking account.

Prosecutors said from 2008 to 2012, Sheikhzadeh under-reported his UN income on his person tax returns.

The indictment said he also used his Citibank account for side transactions with two US-based co-conspirators who wished to invest in Iran, and at their request directed an Iran-based co-conspirator to funnel money to people in that country.

Prosecutors said Sheikhzadeh did not obtain any license from the US Treasury Department authorizing these and other activities.

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