The general rule is: your report all your income on your home state return, even the income earned out of state. You file a non-resident state return for the state you worked in and pay tax to that state. Your home state will give you a credit, or partial credit, for what you paid the non-resident state. You will have to file a non resident NY state return and pay NY tax on the income earned there.. You will also file a NJ full year resident return and calculate tax on ALL your income. NJ will give you a credit, or partial credit, for the tax you pay NY. So, there will be little or no double taxation, but you have the cost and hassle of filing two state returns. Do the nonresident state return first.
Since FL does not have an income tax, you do not have a non-resident return to file. But you still have to pay tax on that income to your home state.
If you live in one state and work in another state; that income is subject to taxation by both states. This is how it works (in most cases): You file a nonresident return for the state you worked in, reporting only the income you physically earned there.
Since you live in a state without an income tax (WY), the next step doesn't apply to you:
You report all your income on your resident state return, including the income earned in the other state. Your home state calculates tax on all your income, but gives you a credit, or partial credit, for tax you paid to the other state.
You also said " I travel in and work ..... out in the field at our many locations across the US". You technically may be subject to income tax in other states. But few people really pay any. See:
http://money.cnn.com/2013/06/28/pf/taxes/business-traveler-tax-threat/ If you live in a state without an income tax (e.g. WY), it’s more likely you should file in the work states. You can't use the "it all comes out even" rationale for not filing.
