Dublin's clampers have been set a target to clamp 60,000 vehicles a year.
Dublin Street Parking Services has confirmed its employees are expected to clamp this number of vehicles under the terms of its contract with Dublin City Council.
It follows an article in today's Irish Times, which says the council has threatened to pay less for the service if the quota is not met.
In a statement, DSPS said: "The issues in the article are of an internal company operational nature, and as such we will not be commenting on them.
"DSPS has never accepted incentives for enforcement above (agreed) service levels."
Last year, Dublin City Council collected €4.3m from the clamping of more than 56,000 vehicles.