public static IncomeTax Generate(ITaxTable taxTable, IGrossIncome grossIncome, IPayPeriod payPeriod)
{
return(new IncomeTax()
{
Amount = TaxTableCalculator.GetTaxForPeriod(payPeriod, grossIncome, taxTable)
});
}
/// <summary>
/// Calculate income tax for given salary and tax table
/// </summary>
/// <param name="salary"></param>
/// <param name="taxTable"></param>
/// <returns></returns>
public decimal CalculateIncomeTax(decimal salary, ITaxTable taxTable)
{
var taxBracket = taxTable.GetTaxBracket(salary);
if (taxBracket == null)
{
throw new TaxBracketNotFoundException(salary);
}
return(Math.Round(
(taxBracket.MandatoryTax + (salary - taxBracket.Minimum - 1) * (taxBracket.Rate / 100)) / 12
, 0
, MidpointRounding.AwayFromZero
));
}
public TaxService(ITaxTable taxTable)
{
this._taxTable = taxTable;
}
public MonthlyPay(ITaxTable taxTable)
{
CurrentTaxTable = taxTable;
}
public TaxTableParser(ITaxTable getTaxBracket)
{
_taxTable = getTaxBracket.GetTaxTable();
}
public TaxCalculator(ITaxTable taxTable, IBenefits benefits)
{
this.taxTable = taxTable;
this.benefits = benefits;
}
public static int GetTaxForPeriod(IPayPeriod payPeriod, IGrossIncome grossIncome, ITaxTable taxTable)
{
var taxBracket = GetTaxBracket(grossIncome, taxTable);
var accumulatedTax = taxBracket.AccumulatedTaxFromPreviousBracket;
var marginalTax = (grossIncome.AnnualAmount - taxBracket.LowerLimit) * taxBracket.MarginalTaxRate;
var totalTax = (accumulatedTax + marginalTax) * DateCalculator.GetPayPeriodAsAFractionOfAYear(payPeriod);
return(totalTax.Rounding());
}
private static ITaxBracket GetTaxBracket(IGrossIncome grossIncome, ITaxTable taxTable)
{
return(taxTable.TaxBrackets.Single(t =>
grossIncome.AnnualAmount > t.LowerLimit && grossIncome.AnnualAmount <= t.UpperLimit));
}
public PayslipGenerator(IPayCalculator payCalculator, ITaxTable taxTable)
{
_payCalculator = payCalculator;
_taxTable = taxTable;
}
