Answer
Formal charge on sulfur = 1, formal charge on oxygen = -1.
Work Step by Step
Formal charge = number of valence electrons -
(number of nonbonding electrons + $\frac{1}{2}$ number of bonding electrons)
For sulfur,
no. of valence electrons = 6
number of nonbonding electrons = 2
number of bonding electrons = 6
Hence, formal charge on sulfur = 1
For oxygen,
no. of valence electrons = 6
number of nonbonding electrons = 6
number of bonding electrons = 2
Hence, formal charge on oxygen = -1.
