personalincometax.asmx

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<%@ WebService Language="C#" Class="TaxService" %>

using System;
using System.Web.Services;

//计算所得税的类，继承了WebService
public class TaxService : WebService {

   //计算每月工薪要交的个人所得税的方法
   [WebMethod]
   //参数salary为月薪数额
   public double taxForSalary(double salary)
   {
       double amount=0;
       salary-=800;
       if(salary<=0)
       {
       	 amount=0;
       }
       else if(salary<=500)
       {
         amount=salary*0.05;
       }
       else if(salary>500&&salary<=2000)
       {
         amount=25+(salary-500)*0.1;
       }
       else if(salary>2000&&salary<=5000)
       {
       	 amount=175+(salary-2000)*0.15;
       }
       else if(salary>5000&&salary<=20000)
       {
       	 amount=625+(salary-5000)*0.2;
       }
       else if(salary>20000&&salary<=40000)
       {
       	 amount=3625+(salary-20000)*0.25;
       }
       else if(salary>40000&&salary<=60000)
       {
       	 amount=8625+(salary-40000)*0.3;
       }
       else if(salary>60000&&salary<=80000)
       {
       	 amount=14625+(salary-60000)*0.35;
       }  
       else if(salary>80000&&salary<=100000)
       {
       	 amount=21625+(salary-80000)*0.4;
       }  
       else if(salary>100000)
       {
       	 amount=29625+(salary-100000)*0.45;
       }     
       return amount;
   }
}