Changes in Welfare rom a lax Without tax With tax Change Consumer Surplus A+B+C Producer Surplus D+E+F AF (B+C) (D+E) Tax Revenue none B+D (B+D) otal surp The area C+E shows the fall in total surplus is the deadweight loss of the tax.Changes in Welfare from a Tax Without Tax With Tax Change Consumer Surplus A + B + C A - (B + C) Producer Surplus D + E + F F - (D + E) Tax Revenue none B + D + (B + D) Total Surplus A + B + C + D + E + F A + B + D + F - (C + E ) The area C+E shows the fall in total surplus is the deadweight loss of the tax