Taxes/401K?

The numbers from your 1099R form that reported this distribution are added into your other income information. The 25% withheld is added to your withholding. You pay tax on your total income (including the distribution) and a 10% penality (on the distribution) is added to the tax due. Most likely the 25% withholding will not cover all of the tax and penality due on the distribution if you had other income.