it only makes a difference if some of the interest is from your resident state and that the interest is exempt from resident state taxation. this varies from state to state. some exempt all of their interest, some exempt none, and some exempt interest only from certain obligations. so even if you find out $x came from your resident state you have to go farther and find out what obligations the dividends arose from and then whether they're exempt in your state. only you can decide if it'll be worth it. if you decide to pass use TX for the state. Texas has no individual income taxes so all the dividend-interest will be taxed by your resident state.
