Federal agencies such as the TPA do not pay property taxes as such, but instead some negotiated amount to account for municipal services, known as 'Payments in lieu of taxes' (PILTs). For the period from 1999 until 2008, the Toronto Port Authority did not make payments in lieu of property tax to the City of Toronto on the Island Airport in a dispute over the amount of the payment. In April 2006, the City applied to the Federal PILTs Dispute Advisory Panel. The City withheld $10 million in contractual payments owed to the TPA pending the dispute resolution.