Calculate pph21

calculatepph21.go

package main

import (
	"fmt"
	"strconv"
	"strings"
)

// condition|rate|percent
var taxRates = [4]string{"<=|50000000|5", "<=|250000000|15", "<=|500000000|25", ">=|500000001|30"}
var statusRates = [5]string{"TK0|36000000", "K0|39000000", "K1|42000000", "K2|45000000", "K3|48000000"}

// MAIN
func main() {
	var gapok int
	fmt.Print("Enter your monthly salary : IDR ")
	_, err := fmt.Scanf("%d\n", &gapok)
	if err != nil {
		fmt.Println("Failed, Please input your salary(monthly).")
		return
	}

	fmt.Println("______________________________________________")
	fmt.Println("TK0 - Single")
	fmt.Println("K0  - Married with no dependant")
	fmt.Println("K1  - Married with 1 dependant")
	fmt.Println("K2  - Married with 2 dependants")
	fmt.Println("K3  - Married with 3 dependants")

	var status string
	fmt.Print("Enter your married status (e.g K1) : ")
	_, err = fmt.Scanf("%s\n", &status)
	if err != nil {
		fmt.Println("Failed, Please input your married status, See example above. 👆")
		return
	}

	// cacl
	calcTaxableIncome := calcTaxableIncome(gapok, strings.ToUpper(status))
	calcTaxIncome := calcTaxIncome(calcTaxableIncome)

	// result
	fmt.Println("______________________________________________")
	fmt.Println("")
	fmt.Println("Annual taxable income = IDR ", calcTaxableIncome)
	fmt.Println("Annual tax income = IDR ", calcTaxIncome)
}

func calcTaxableIncome(incomePermonth int, statusInput string) int {
	result := 0
	for i := 0; i < len(statusRates); i++ {
		arr := strings.Split(statusRates[i], "|")
		status := arr[0]
		rate := arr[1]

		if statusInput == status {
			parseRate, err := strconv.Atoi(rate)
			if err != nil {
				panic("Parse to integer error!")
			}
			result = (incomePermonth * 12) - parseRate
			break
		}
	}
	return result
}

func calcTaxIncome(annualIncome int) int {
	result := 0
	for i := 0; i < len(taxRates); i++ {
		value := strings.Split(taxRates[i], "|")
		math := value[0]
		max, err := strconv.Atoi(value[1])
		percent, err := strconv.Atoi(value[2])
		if err != nil {
			panic("Parse to integer error!")
		}

		if math == "<=" {
			if annualIncome <= max {
				result = (percent * annualIncome) / 100
				break
			}
		} else if math == ">=" {
			result = (percent * annualIncome) / 100
			break
		}
	}

	return result
}

OUTPUT:
$ go run calculatepph21.go

Enter your monthly salary : IDR 4500000

---

TK0 - Single
K0 - Married with no dependant
K1 - Married with 1 dependant
K2 - Married with 2 dependants
K3 - Married with 3 dependants
Enter your married status (e.g K1) : k1

---

Annual taxable income = IDR 12000000
Annual tax income = IDR 600000