Is there any income tax calculator that can quickly give me an estimate of the total tax I will have to pay at end of the year?

Income tax is NEVER paid at the end of the year... its paid every paycheck.. or quarterly if you are self employed.

And there are too many variables city to city and state to state for there to be ONE calculator to use. Because rates vary based in income level.

You have to look at Federal and state tax tables to figure it out.