public class Income{
   private final double FEDERAL = 0.15;
   private final double STATE = 0.035;
   private final double SOCIAL_SECURITY = 0.0575;
   //  etc...
   
   
   public double calculate_income(double raw_val){
      return (raw_val- getFederal(raw_val) - getState(raw_val));//  etc...
   }
   
   public double getFederal(double val){
      return val * FEDERAL;
   }
   
   public double getState(double val){
      return val * STATE;
   }
   
   //  etc...
}