This is a withholding amount. You need to file your taxes, include this income, and this withholding to determine if you owe any additional taxes. It is like withholding on a paycheck -- it is just an estimated amount.
Any individual seeking legal advice for their own situation should retain their own legal counsel as this response provides information that is general in nature and not specific to any person's unique situation. Circular 230 Disclaimer - Advice given in this response cannot be used to eliminate penalties with the IRS or any other governmental agency.