Make sure you read the requirements ahead of time. Do I need to file a New York State tax return?How do I know if I am a resident of New York State for income tax purposes? ❖ Each residence on the application must be documented. Proof will be required within 30 days of the date of any move in the past year. We've got the answers in our FAQs. After reviewing the exemptions, click the homestead exemption online portal link at the bottom of this page to file quickly and securely. NYDocSubmit is an app for mobile devices and is available for download in the Apple App Store and Google Play Store.