A New York resident is taxed on income earned anywhere. Additionally, you may have to pay sales tax in other states if you sell products and/or services outside New York or receive commissions, have affiliates or perform certain other activities in a state besides New York.
Your post does not say whether you sell a product or service. Not all goods or services are subject to tax and most states have de minimis levels for casual sellers.
The Sales Tax Institute has a Remote Seller Nexus Chart that lists thresholds in various states along with various types of nexus — click through, affiliate, marketplace and economic — and an explanation.
