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Dir : ~/home/tech/hr.techlup.co.ke/hr/app/Helpers/

View File Name : TaxCalculator.php

<?php
namespace App\Helpers;

trait TaxCalculator
{
    protected function calculateNSSF($gross): float
    {
        $nssf = $gross > 36000 ? 2160 : $gross * 0.06;

        return round($nssf, 2);
    }

    protected function calculateNHIF($gross): float
    {
        if ($gross < 6000) {
            return 150;
        } elseif ($gross < 8000) {
            return 300;
        } elseif ($gross < 12000) {
            return 400;
        } elseif ($gross < 15000) {
            return 500;
        } elseif ($gross < 20000) {
            return 600;
        } elseif ($gross < 25000) {
            return 750;
        } elseif ($gross < 30000) {
            return 850;
        } elseif ($gross < 35000) {
            return 900;
        } elseif ($gross < 39000) {
            return 950;
        } elseif ($gross < 45000) {
            return 1000;
        } elseif ($gross < 50000) {
            return 1100;
        } elseif ($gross < 60000) {
            return 1200;
        } elseif ($gross < 70000) {
            return 1300;
        } elseif ($gross < 80000) {
            return 1400;
        } elseif ($gross < 90000) {
            return 1500;
        } elseif ($gross < 100000) {
            return 1600;
        } else {
            return 1700;
        }
    }

    protected function calculatePAYE($gross): float
    {
        $tax = 0;
        $balance = 0;
        $releif = 2400;
        $val = $gross - $this->calculateNSSF($gross);
        if ($val >= 24000) {
            $tax += 0.1 * 24000; // 1st
            $balance = $val - 24000;
            if ($balance >= 1 && $balance <= 8333) {
                $tax += 0.25 * $balance; // next
                $balance -= $balance;
            } elseif ($balance > 8333) {
                $tax += 0.25 * 8333; // next
                $balance -= 8333;
            }

            if ($val >= 32333)
                $tax += 0.30 * $balance;
            $tax -= $releif;
        }

        return max(round($tax - (0.15 * $this->calculateNHIF($gross))- (0.15 * $this->calculateHousingLevy($gross)), 2), 0);
    }

    protected function calculateHousingLevy($gross): float
    {
        $housing_levy = (1.5/100) * $gross;
        if($housing_levy > 5000)
            return $housing_levy;

        return $housing_levy;
    }
}