新旧个税计算公式对比–ps:世界上最好的语言PHP

先上代码为敬

<?php
echo "个税计算新旧对比:\r\n";
/**
 * [oldMyMoney 旧版本个税计算]
 * @Author   yangjun
 * @DateTime 2018-08-31
 * @version  [version]
 * @param    [type]     $myMoney [税前工资]
 * @param    [type]     $sNumb   [社保缴纳基数]
 * @param    [type]     $gNumb   [公积金缴纳基数]
 * @return   [type]              [description]
 */
function oldMyMoney($myMoney, $sNumb, $gNumb)
{
    $lastMoney = $myMoney;
    //扣除社保所交额度
    $lastMoney -= getMySMoney($sNumb);
    //扣除公积金所交额度
    $lastMoney -= getMyGMoney($gNumb);
    //判断应纳税额
    $lastMoney -= 3500;
    //计算个税扣除
    if ($lastMoney<=1500) {
        $lastMoney = $lastMoney*0.03;
    } else if ($lastMoney>1500 && $lastMoney<=4500) {
        $lastMoney = $lastMoney*0.1-105;
    } else if ($lastMoney>4500 && $lastMoney<=9000) {
        $lastMoney = $lastMoney*0.2-555;
    } else if ($lastMoney>9000 && $lastMoney<=35000) {
        $lastMoney = $lastMoney*0.25-1005;
    } else if ($lastMoney>35000 && $lastMoney<=55000) {
        $lastMoney = $lastMoney*0.3-2775;
    } else if ($lastMoney>55000 && $lastMoney<=80000) {
        $lastMoney = $lastMoney*0.35-5505;
    } else if ($lastMoney>80000) {
        $lastMoney = $lastMoney*0.45-13505;
    }
    return $lastMoney;
}

/**
 * [nowMyMoney 新版本个税计算]
 * @Author   yangjun
 * @DateTime 2018-08-31
 * @version  [version]
 * @param    [type]     $myMoney [税前工资]
 * @param    [type]     $sNumb   [社保缴纳基数]
 * @param    [type]     $gNumb   [公积金缴纳基数]
 * @return   [type]              [description]
 */
function nowMyMoney($myMoney, $sNumb, $gNumb)
{
    $lastMoney = $myMoney;
    //扣除社保所交额度
    $lastMoney -= getMySMoney($sNumb);
    //扣除公积金所交额度
    $lastMoney -= getMyGMoney($gNumb);
    //判断应纳税额
    $lastMoney -= 5000;
    //计算个税扣除
    if ($lastMoney<=3000) {
        $lastMoney = $lastMoney*0.03;
    } else if ($lastMoney>3000 && $lastMoney<=12000) {
        $lastMoney = $lastMoney*0.1-210;
    } else if ($lastMoney>12000 && $lastMoney<=25000) {
        $lastMoney = $lastMoney*0.2-1410;
    } else if ($lastMoney>25000 && $lastMoney<=35000) {
        $lastMoney = $lastMoney*0.25-2660;
    } else if ($lastMoney>35000 && $lastMoney<=55000) {
        $lastMoney = $lastMoney*0.3-4410;
    } else if ($lastMoney>55000 && $lastMoney<=80000) {
        $lastMoney = $lastMoney*0.35-7160;
    } else if ($lastMoney>80000) {
        $lastMoney = $lastMoney*0.45-15160;
    }
    return $lastMoney;
}

/**
 * [getMySMoney 个人所交社保]
 * @Author   yangjun
 * @DateTime 2018-08-31
 * @version  [version]
 * @param    [type]     $sNumb [description]
 * @return   [type]            [description]
 */
function getMySMoney($sNumb)
{
    $money = 0;
    //养老保险
    $money += $sNumb*0.08;

    //医疗保险
    $money += ($sNumb*0.02+3);

    //失业保险
    $money += $sNumb*0.002;

    //工商保险 无
    
    //生育险  无
    
    return $money;
}

/**
 * [getMyGMoney 个人所交住房公积金]
 * @Author   yangjun
 * @DateTime 2018-08-31
 * @version  [version]
 * @param    [type]     $gNumb [description]
 * @return   [type]            [description]
 */
function getMyGMoney($gNumb)
{
    return $gNumb*0.12;
}

echo "之前缴纳个税".oldMyMoney(8000, 8000, 8000)."\r\n";
echo "现在缴纳个税".nowMyMoney(8000, 8000, 8000)."\r\n";