It would be wonderful if all the state programs worked together. Unfortunately, this is too complex an issue. States have separate tax systems. What’s income in one state may be exempt in another.
For example, not all states tax unemployment benefits.
States also use different systems to compute tax. Some states tax you on the actual income you report to that state, others use a ratio system where your tax is the percentage of total income ÷ total income. Still other states subtract non-state income.
The best practice is to write down how much income you are allocating to each state and make sure the totals match (after adjusting for state differences).
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