Confidential Supplement to Application for Earnings Withholding Order for Taxes (State Tax Liability) (WG-021) Tells the court, employer, and levying officer the Social Security Number of a person who owes state taxes. Get form WG-021 Effective: January 1, 2007 View WG-021 Confidential Supplement to Application for Earnings Withholding Order for Taxes (State Tax Liability) form Go to How-to instructions for Debt Collection