ALL your income is of course taxable by your home state of PA. regardless of where you earn it.
With regard to its possibly being also taxed by NY, NY adheres to the "convenience of the employer" doctrine regarding non-resident remote workers. Basically this means:
If, as a remote worker for an NY employer, you work remotely outside NY for your own convenience, then the income from that work is taxable by NY.
But if you work remotely because you're required to do so by your employer, then the income from that work is not taxable by NY.
Legislation is pending in NY to define work done remotely outside NY because of COVID-19 as being not taxable by NY, but the legislation has not yet passed.
https://www.nysenate.gov/legislation/bills/2019/s8386
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
