I am a law school graduate. What I offer is mere information, not to be construed as forming an attorney client relationship.
I tried looking via the statutes, but the New York laws website was down.
But I did find this site that sounds like it will help you. The site is located at the bottom of these paragraphs from the site. New York is listed as 90%:
Garnishments can be scary and embarrassing. Not only do you fear losing the money but what will your employer think of you? The process for garnishments varies depending on state laws so to best determine your rights & review your state laws. Here are some basics.
Each state has laws that regulate the amount that can be garnished. The laws differ from state to state. In Arizona, the law allows 100% of both husband and wife's wages. But since this means there is no money left to live on ,you can petition the court to allow only 50%.
Pennsylvania & Texas exempt all wages from garnishment. Florida exempts the wages for the head of household. Illinois exempts 85% of wages and New York exempts 90% of wages. Wisconsin exempts 60% or a max of 100.00. If there are dependants the exemption cannot exceed 75% of the families income. Kentucky exempts a max of 67.50 per month. As you can see it is very important to know your particular states law so that you can determine how much is allowed to be taken.
http://www.carreonandassociates.com/garnishments.htm