个人所得税计算方法计算方法 :
全月应纳税所得额 =工资薪金所得-3500
应纳税额 = 应纳税所得额 *税率-速算扣除数
(自己初学Java做的小练习)

import java.util.Scanner;
public class TestDemo{
    
    
	public static void main(String[] args){
    
    
		Scanner sc=new Scanner(System.in);             //与键盘建立连接
		System.out.println("请输入你的薪水：");
		double salary=sc.nextDouble();
		double taxableIncome = salary -3500;
		if(taxableIncome>100000){
    
    
			double sum=salary-(taxableIncome*0.45-15375);
			System.out.println("实际工资"+sum);			
		}else if(taxableIncome>80000){
    
    
			double sum=salary-(taxableIncome*0.4-10375);
			System.out.println("实际工资"+sum);			
		}else if(taxableIncome>60000){
    
    
			double sum=salary-(taxableIncome*0.35-6375);
			System.out.println("实际工资"+sum);			
		}else if(taxableIncome>40000){
    
    
			double sum=salary-(taxableIncome*0.3-3375);
			System.out.println("实际工资"+sum);			
		}else if(taxableIncome>20000){
    
    
			double sum=salary-(taxableIncome*0.25-1375);
			System.out.println("实际工资"+sum);			
		}else if(taxableIncome>5000){
    
    
			double sum=salary-(taxableIncome*0.2-375);
			System.out.println("实际工资"+sum);			
		}else if(taxableIncome>2000){
    
    
			double sum=salary-(taxableIncome*0.15-125);
			System.out.println("实际工资"+sum);			
		}else if(taxableIncome>500){
    
    
			double sum=salary-(taxableIncome*0.10-25);
			System.out.println("实际工资"+sum);			
		}else if(taxableIncome>0){
    
    
			double sum=salary-(taxableIncome*0.05-0);
			System.out.println("实际工资"+sum);			
		}else{
    
    
			System.out.println("你还没有交税的资格");
		}
		
	}
}

运行结果如下：