federal taxes operat under a graduated tax system . the higer the income, the higher the rate on the last $$$ of income so you would be adding $45,000 to your income. say that your single and your 2017 taxable income was $20,000 before this $45k your tax would be about $2,500. the tax rate on about the last $10,700 of the $20,000 is 15%.
but now your income is $65,000. the tax on that is about $12,000 the first $18K of the additional $45K is taxed at 15% and the balance of $27k is taxed at 25%
in addition you'll owe $4,500 for the early withdrawal penalty. total $16,500
you could look at it as the $45K costing you an additional $14k in taxes
if for 2018, regular taxes of about $10,200 + the $4,500 penalty for a total of $14,700. top tax bracket 22%
