This excerpt taken from the WFII DEF 14A filed Apr 14, 2005.
Restricted Stock Units
There are no immediate tax consequences of receiving an award of restricted common stock units under the 2005 Incentive Plan. A grantee who is awarded restricted common stock units will be required to recognize ordinary income in an amount equal to the fair market value of shares issued to such grantee at the end of the restriction period or, if later, the payment date. If we comply with the restrictions of Section 162(m) of the Code, we will be entitled to a deduction for compensation paid in the same amount treated as compensation income to the grantee in the year the grantee is taxed on the income.