Married filling jointly. New York income factor isn't fair? what can I do about it?

[kyoungbloody]

My wife worked in NY and earned a more modest salary than I in 2018. When we go to file her NY state taxes my income is being taken into consideration in the filing of NY state taxes despite us not maintaining a home in NY. I've included a screenshot and I thought her tax liability should be more like $600 not $1100. Seems quite unfair! I've attached a picture in the Turbo Tax software of what I'm talking about. 

[ChristieB]

The summary page is slightly misleading because while you are correct that your total income on your joint return is being considered, it is only used as a starting point to find the applicable amount of tax for that income (Starting Amount).

Then, that amount of tax is multiplied by the New York Income Factor (which is your New York income divided by your Federal Adjusted Gross Income). 

This is to ensure that you pay the appropriate tax rate, but only for the amount of income earned in New York. 

I hope that this fully answers your question, if it doesn't, kindly post additional details below.