One phrase, several meanings
Some states use aggravated theft as the name for theft they treat as more serious, often because of the amount involved or the kind of victim. New York instead grades theft as larceny, from petit larceny up through several degrees of grand larceny, so the closest equivalent here is usually a higher degree of grand larceny. Federal law has a separate offense called aggravated identity theft, which applies when another person's identifying information is used in connection with certain other federal crimes. That federal charge generally carries its own required prison term that runs in addition to the sentence for the underlying offense, which is one reason prosecutors add it. Knowing which of these you are facing changes nearly everything about the case.
Where the aggravating fact comes from
Whatever the system, the more serious version of a theft charge usually depends on a specific fact the prosecution must prove, and that fact is frequently where the defense work happens. When value drives the charge, the dispute often concerns how losses were added up across time or across accounts. When the charge rests on who the victim was or what kind of property was involved, the records about that person or property deserve close review. In federal identity theft matters, a recurring question is whether the person knew the information belonged to a real individual. Collect the charging papers, any statements you received from a bank or employer, and your own records of the transactions in question.
When the case is outside New York
If you live in New York but the charge was filed in another state, the case will be governed by that state's law and courts, and you will generally need a lawyer admitted there or appearing with local counsel. Federal charges are heard in the federal district where the case was brought. In a first conversation we work out which system the charge belongs to, what the aggravating element actually is, and what court dates are already set. We also look at whether there are related civil claims, such as an employer or bank seeking repayment, that need to be coordinated with the criminal case so that statements in one do not damage the other.