How Compute tax using Java

In this tutorial we will write sample program to calculate federal personal income tax based on filing status and taxable income.

There are four filing statuses:

The tax rates vary every year. Shown in below table

You are to write a program to compute personal income tax. Your program should prompt the user to enter the filing status and taxable income and compute the tax. Enter 0 for single filers, 1 for married filing jointly, 2 for married filing separately, and 3 for head of household.

import java.util.Scanner;

public class CalculateTax {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        // This will prompt the user to enter filing status on console
        System.out.print("Enter the filing status: ");
        int status = input.nextInt();

        // This will prompt the user to enter taxable income on console
        System.out.print("Enter the taxable income: ");
        double income = input.nextDouble();

        double tax = getTax(status, income);
        // Display tax result
        System.out.println("Tax is " + tax);

    }

    public static double getTax(int status, double income) {
        // Compute tax
        double tax = 0;
        switch (status) {
            case 0: // Calculate tax for single filers
                tax += (income <= 8350) ? income * 0.10 : 8350 * 0.10;
                if (income > 8350)
                    tax += (income <= 33950) ? (income - 8350) * 0.15 :
                            25600 * 0.15;
                if (income > 33950)
                    tax += (income <= 82250) ? (income - 33950) * 0.25 :
                            48300 * 0.25;
                if (income > 82250)
                    tax += (income <= 171550) ? (income - 82250) * 0.28 :
                            89300 * 0.28;
                if (income > 171550)
                    tax += (income <= 372950) ? (income - 171550) * 0.33 :
                            201400 * 0.33;
                if (income > 372950)
                    tax += (income - 372950) * 0.35;
                break;
            case 1: // Calculate tax for married file jointly or qualifying widow(er)
                tax += (income <= 16700) ? income * 0.10 : 16700 * 0.10;
                if (income > 16700)
                    tax += (income <= 67900) ? (income - 16700) * 0.15 :
                            (67900 - 16700) * 0.15;
                if (income > 67900)
                    tax += (income <= 137050) ? (income - 67900) * 0.25 :
                            (137050 - 67900) * 0.25;
                if (income > 137050)
                    tax += (income <= 208850) ? (income - 137050) * 0.28 :
                            (208850 - 137050) * 0.28;
                if (income > 208850)
                    tax += (income <= 372950) ? (income - 208850) * 0.33 :
                            (372950 - 208850) * 0.33;
                if (income > 372950)
                    tax += (income - 372950) * 0.35;
                break;
            case 2: // Calculate tax for married separately
                tax += (income <= 8350) ? income * 0.10 : 8350 * 0.10;
                if (income > 8350)
                    tax += (income <= 33950) ? (income - 8350) * 0.15 :
                            (33950 - 8350) * 0.15;
                if (income > 33950)
                    tax += (income <= 68525) ? (income - 33950) * 0.25 :
                            (68525 - 33950) * 0.25;
                if (income > 68525)
                    tax += (income <= 104425) ? (income - 68525) * 0.28 :
                            (104425 - 68525) * 0.28;
                if (income > 104425)
                    tax += (income <= 186475) ? (income - 104425) * 0.33 :
                            (186475 - 104425) * 0.33;
                if (income > 186475)
                    tax += (income - 186475) * 0.35;
                break;
            case 3: // Calculate tax for head of household
                tax += (income <= 11950) ? income * 0.10 : 11950 * 0.10;
                if (income > 11950)
                    tax += (income <= 45500) ? (income - 11950) * 0.15 :
                            (45500 - 11950) * 0.15;
                if (income > 45500)
                    tax += (income <= 117450) ? (income - 45500) * 0.25 :
                            (117450 - 45500) * 0.25;
                if (income > 117450)
                    tax += (income <= 190200) ? (income - 117450) * 0.28 :
                            (190200 - 117450) * 0.28;
                if (income > 190200)
                    tax += (income <= 372950) ? (income - 190200) * 0.33 :
                            (372950 - 190200) * 0.33;
                if (income > 372950)
                    tax += (income - 372950) * 0.35;
                break;
            default:
                System.out.println("You  have enter invalid status and valid status are:\n" +
                        "0-for single filers\n" +
                        "1-for married filing jointly\n" +
                        "2-for married filing separately\n" +
                        "3-for head of household");
                System.exit(1);
        }

        tax = (int) (tax * 100) / 100.0;
        return tax;
    }


}

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