MY FEDERAL TAX DUE IS 21000. LAST YEAR WAS 4000. MY INCOME INCREASED 10%. ALL OTHER EXPENSES ARE THE SAME. WHY THIS HUGE DIFERENCE?

[SteamTrain]

All you can do is review all the lines on your tax return and see if you made some entry errors.  See if you doubled your income with a double-entry somehwer...or missed a decimal point indicating an extra 100,000 income instead of 10,000, or 1,000
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For folks with W-2 income, the withholding rate was reduced, and many people who didn't change their withholding, or review it last February.....they found out that there was less tax withholding all of this year..thus they owed more.

Also, many who had significant State Income tax, and Property tax deductions last year ...lost a lot of that.  Saw one individual with 37,000 of state income tax +property tax deductions for 2017....they lost $27,000 of that deduction for 2018 because only $10,000 (max) is allowed to be deducted this year.