Your income is fully included in your home state return. Just like those smokers who happen to pay and out of state tax on cig's, you get a credit for the amount of tax paid to another state. If this tax paid to another state equals or exceeds your home state tax their is no add'l amount due.
However, ALL your income is subject to your home state tax.
If you folks got your wish then the only remedy that states would have is either federalize the tax thru the federal gov't or do it by agreement.
You folks really don't want the remedy you suggest. Trust me.
PS. You too, really ought not do your own taxes.
I don't do my own taxes anymore, after nearly 20 years of doing not only mine, but those of others, I got sick and bloody tired of it. Last year we filed returns for 3 states..........I know what I am talking about.
Withholding taxes throughout the year are withheld in proportionate amounts from all 3 states...I know I get credit for what is withheld from the other states come filing time - but that is not what I said - I said withholding...or can't you read?
Typical nanny-state mentality........have to change the subject to fit your own agenda - regardless of the subject.
Like I said, you can explain all you want to. Missouri get's no money from me for income tax.