New York Notice of Cancellation of Deficiency-Determination And Discontinuance of Proceeding is a type of document used by the New York State Department of Taxation and Finance to inform a taxpayer that it has cancelled a deficiency determination and discontinued a proceeding against them. This document is issued when the Department finds that the taxpayer’s deficiency has been satisfied or the taxpayer has reached a settlement with the Department. This document can be issued in two forms: a voluntary cancellation or a mandatory cancellation. In the voluntary cancellation, the Department agrees to cancel the deficiency determination and discontinue the proceeding upon the taxpayer’s request. This type of cancellation can be requested by the taxpayer if they believe they have satisfied the deficiency or have reached a settlement with the Department. In the mandatory cancellation, the Department is required to cancel the deficiency determination and discontinue the proceeding, usually due to a court order or an agreement between the Department and the taxpayer. This type of cancellation can be requested by the Department if the taxpayer has failed to respond to a deficiency determination or to a proceeding against them. The New York Notice of Cancellation of Deficiency-Determination And Discontinuance of Proceeding will include information on the taxpayer, the deficiency determination, and the status of the proceeding. It will also provide instructions on how to appeal the decision if the taxpayer wishes to do so.