If you withdraw money from your 401k in 2017, you will receive a 1099R in January of 2018. You will enter the information from that 1099R onto your 2017 tax return, and TurboTax will calculate the tax you may owe for the distribution from your retirement account.
When you prepare your 2017 return: To enter your retirement income, Go to Federal> Wages and Income>Retirement Plans and Social Security>IRA 401 k) Pension Plan Withdrawals to enter your 1099R.
You did not mention how old you are--if you are under 59 1/2 you will incur a 10% early withdrawal penalty for the distribution.
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