TaxCalc.java

/**
	 * Calculates the amount of tax to deduct
	 * from gross monthly pay.
	 * No tax is taken on the first £375
	 * 10% is taken on the next £225
	 * and 23% is taken on what remains
	 * @param grossPay - An employees gross pay
	 */
	public void taxCalc(double grossPay) {
		
		// variables to hold the tax and pay to be taxed respectively
		double tax;
		double taxablePay;
		taxablePay = 0;
		tax = 0;
		
		// Prints total pay before taxation to screen
		System.out.printf("Gross Pay before taxation: " + "£%.2f\n", grossPay);

		// Subtracts £375, whatever remains can be taxed
		taxablePay = grossPay - FIRST_TAX_TARIFF;
		
		// Checks which tariff and calculates total taxation
		if (taxablePay > 0 && taxablePay <= SECOND_TAX_TARIFF) {
			tax = taxablePay * FIRST_TARIFF_PERCENTAGE;
		} else if (taxablePay > 0 && taxablePay > SECOND_TAX_TARIFF) {
			tax = SECOND_TAX_TARIFF * FIRST_TARIFF_PERCENTAGE;
			taxablePay -= SECOND_TAX_TARIFF;
			tax += (taxablePay * SECOND_TARIFF_PERCENTAGE);
		}
		// Subtracts total taxation from gross pay and prints to screen
		grossPay -= tax;
		System.out.printf("Gross Pay after taxation: " + "£%.2f\n", grossPay);
	}