java：个人所得税计算器

eclipse使用Java编写简易版个人所得税计算器

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前言

计算个人所得税的缴纳情况。用户从控制台输入税前工资额金额，系统根据用户输入的工作金额计算应缴纳的税额

工资个税的计算公式为：
应纳税额 = （工资薪资所得 - 扣除数）* 适用税率 - 速算扣除数
全月应纳税所得额 = 月工资薪资所得 - 扣除数
2011年9月1日起执行7级超额累进税率：扣除数为3500元

代码实现

具体代码如下：

package day03;
import java.util.Scanner;

public class IncomeTax {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		System.out.println("请输入税前工资金额（￥）：");
		double total = scan.nextDouble();
		if(total < 3500) {
			System.out.println("您不需要缴纳个人所得税！");
		}else if((total - 3500) <= 4500) {
			double tax = (total - 3500) * 3/100;
			System.out.println("您应缴纳："+tax+"元个人所得税");
		}else if((total - 3500) <= 4500) {
			double tax = (total - 3500) * 10/100 - 105;
			System.out.println("您应缴纳："+tax+"元个人所得税");
		}else if((total - 3500) <= 9000) {
			double tax = (total - 3500) * 20/100 - 555;
			System.out.println("您应缴纳："+tax+"元个人所得税");
		}else if((total - 3500) <= 35000) {
			double tax = (total - 3500) * 25/100 - 1005;
			System.out.println("您应缴纳："+tax+"元个人所得税");
		}else if((total - 3500) <= 55000) {
			double tax = (total - 3500) * 30/100 - 2755;
			System.out.println("您应缴纳："+tax+"元个人所得税");
		}else if((total - 3500) <= 80000) {
			double tax = (total - 3500) * 35/100 - 5505;
			System.out.println("您应缴纳："+tax+"元个人所得税");
		}else {
			double tax = (total - 3500) * 45/100 - 13505;
			System.out.println("您应缴纳："+tax+"元个人所得税");
		}
		

	}

}

代码优化：

package day03;
import java.util.Scanner;

public class IncomeTax {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		System.out.println("请输入税前工资金额（￥）：");
		double total = scan.nextDouble();
		double taxIncome = total - 3500;
		double tax = 0.0;
		if(total < 3500) {
			tax = 0.0;
		}else if(taxIncome <= 4500) {
			tax = taxIncome * 3/100;
		}else if(taxIncome <= 4500) {
			tax = taxIncome * 10/100 - 105;
		}else if(taxIncome <= 9000) {
			tax = taxIncome * 20/100 - 555;
		}else if(taxIncome <= 35000) {
			tax = taxIncome * 25/100 - 1005;
		}else if(taxIncome <= 55000) {
			tax = taxIncome * 30/100 - 2755;
		}else if(taxIncome <= 80000) {
			tax = taxIncome * 35/100 - 5505;
		}else {
			tax = taxIncome * 45/100 - 13505;
		}
		System.out.println("您应缴纳："+tax+"元个人所得税");
		

	}

}