@NateTheGrEAt
There are only 7 states that tax income from the state even if you live elsewhere (although NY is one of them).
@jennifervphan
The answer depends on why you relocated. Most states only tax income you receive when you live or work in the state. If you live and work in WA, most states won't tax you if you work for an employer based in that state.
NY is one of the exceptions. NY applies a "convenience of the employer" rule. Here is the state regulation.
https://www.tax.ny.gov/pdf/memos/income/m06_5i.pdf
Briefly, if you are working out of NY for your employer's benefit, your income is not considered NY taxable income. For example, you are a salesperson and your territory is WA. Or, the employer requires you to work remotely and provides you an office in WA, or reimburses you for office expenses. Those factors would tend to show that you are working in WA for your employer's benefit.
If you are working in WA for your own convenience, then your NY income is NY taxable income. You would file a non-resident tax return to report your NY-source income. That would include this job, but would not include other income like other jobs and side-gigs, interest or investments.
Then, in most states, you would owe a tax return for the state you live in to report all your world-wide taxable income, and you would get a credit for the out of state taxes you paid. But that doesn't apply to you.
