public Payslip Generate(Employee employee, PayPeriod payPeriod)
{
var grossIncome = CalculateGrossIncomeForPayPeriod(employee.AnnualSalary, payPeriod);
var annualTax = _taxCalculator.CalculateAnnual(employee.AnnualSalary);
var incomeTax = CalculateTaxForPayPeriod(annualTax, payPeriod);
return(new Payslip(employee, payPeriod, grossIncome, incomeTax));
}
public Payslip(Employee employee, PayPeriod payPeriod, decimal grossIncome, decimal incomeTax)
{
Employee = employee;
PayPeriod = payPeriod;
GrossIncome = grossIncome;
IncomeTax = incomeTax;
NetIncome = GrossIncome - IncomeTax;
Super = GrossIncome * (employee.SuperRate / 100);
}
private static int CalculateMonthsInPeriod(PayPeriod payPeriod)
{
return((payPeriod.EndDate.Month - payPeriod.StartDate.Month + 1) + 12 * (payPeriod.EndDate.Year - payPeriod.StartDate.Year));
}
public static decimal CalculateTaxForPayPeriod(decimal annualTax, PayPeriod payPeriod)
{
var monthsInPeriod = CalculateMonthsInPeriod(payPeriod);
return(annualTax / 12 * monthsInPeriod);
}
public static decimal CalculateGrossIncomeForPayPeriod(decimal annualSalary, PayPeriod payPeriod)
{
var monthsInPeriod = CalculateMonthsInPeriod(payPeriod);
return(Math.Round(annualSalary * monthsInPeriod / 12, 5, MidpointRounding.AwayFromZero));
}