protected override OperationResult <decimal> CalculateTax(decimal annualIncome)
{
var result = new OperationResult <decimal>();
/*
* 1. Get all settings with fromAmount less than the annual Income. These are all the valid bands
* 2. The last band will have ToAmount >annualIncome so you will need to use the annualIncome value
*/
var taxSettings = TaxRateSettings.Where(t => t.FromAmount <= annualIncome)
.OrderBy(t => t.FromAmount);
var taxAmounts = new List <decimal>();
foreach (var taxSetting in taxSettings)
{
var maxAmount = (taxSetting.ToAmount ?? annualIncome) < annualIncome ? taxSetting.ToAmount : annualIncome;
var taxableAmount = maxAmount.Value - taxSetting.FromAmount;
var taxAmount = taxableAmount * (taxSetting.TaxRatePerc / 100.00M);
taxAmounts.Add(taxAmount);
}
result.Response = taxAmounts.Sum();
return(result);
}
