/// <summary>
/// Calculates the tax for the last item.
/// </summary>
/// <param name="request">The request.</param>
/// <returns>The response.</returns>
private static CalculateTaxServiceResponse CalculateTax(CalculateTaxServiceRequest request)
{
ThrowIf.Null(request, "request");
TaxHelpers.SetSalesTaxGroup(request.RequestContext, request.Transaction);
SalesTaxOverrideHelper.CalculateTaxOverrides(request.RequestContext, request.Transaction);
// Consider active (non-void) lines for tax.
// Need to recalculate tax on return-by-receipt lines because we cannot reconstruct tax lines from return transaction lines alone.
// A few key information like IsExempt, IsTaxInclusive, TaxCode are not available on return transaction line.
foreach (var saleItem in request.Transaction.ActiveSalesLines)
{
saleItem.TaxRatePercent = 0;
saleItem.TaxLines.Clear();
}
var totaler = new SalesTransactionTotaler(request.Transaction);
totaler.CalculateTotals(request.RequestContext);
ClearChargeTaxLines(request.Transaction);
TaxContext taxContext = new TaxContext(request.RequestContext);
TaxCodeProvider defaultProvider = GetTaxProvider(request.RequestContext, taxContext);
defaultProvider.CalculateTax(request.RequestContext, request.Transaction);
return(new CalculateTaxServiceResponse(request.Transaction));
}
public AddTaxViewModel(IEventAggregator ea, IOfficeContext context)
{
eventAggregator = ea;
this.context = context;
TaxDTO = new TaxContext();
TaxList = new ObservableCollection <TaxContext>();
LoadTaxList();
}
public VatControllers(TaxContext dbContext)
{
db = dbContext;
if (db.Vats.Count() == 0)
{
db.Vats.Add(new Vat {
VatId = 7,
EffectDate = DateTime.Now
});
db.SaveChanges();
}
taxRepo = new Repository(db);
}
private static async Task Main(string[] args)
{
double principleAmount = 1000;
var taxContext = new TaxContext();
double taxValue = await taxContext.TaxCalculation(Tax.GST, principleAmount);
Console.WriteLine($"GST : {taxValue}");
taxValue = await taxContext.TaxCalculation(Tax.VAT, principleAmount);
Console.WriteLine($"Vat : {taxValue}");
}
/// <summary>
/// Get the tax code provider.
/// </summary>
/// <param name="context">The request context.</param>
/// <param name="taxContext">Tax context.</param>
/// <returns>The tax code provider.</returns>
private static TaxCodeProvider GetTaxProvider(RequestContext context, TaxContext taxContext)
{
TaxCodeProvider taxCodeProvider;
switch (context.GetChannelConfiguration().CountryRegionISOCode)
{
case CountryRegionISOCode.IN:
taxCodeProvider = new TaxCodeProviderIndia(taxContext);
break;
default:
taxCodeProvider = new TaxCodeProvider(taxContext);
break;
}
return(taxCodeProvider);
}
/// <summary>
/// Keeps track of totals aggregated by tax codes and rounds current value accordingly.
/// </summary>
/// <param name="taxContext">The tax context.</param>
/// <param name="taxCode">The tax code. Used to get rounding configuration.</param>
/// <param name="groupKey">The tax code grouping key, such as tax code (net invoice) or tax code combination.</param>
/// <param name="taxCodeAmountNonRounded">The non-rounded tax code amount.</param>
/// <returns>The rounded value of tax code amount.</returns>
internal decimal Round(TaxContext taxContext, TaxCode taxCode, string groupKey, decimal taxCodeAmountNonRounded)
{
// Adjustments after roundings on accrued totals are needed for following cases.
if (taxCode.TaxGroupRounding || taxCode.TaxLimitBase == TaxLimitBase.InvoiceWithoutVat)
{
// Calculate current TaxCode.TotalAmount by summing up all non-rounded, [all previous and current] taxLines.taxCode.Amounts.
// That’s what we supposed to collect as a Tax for a given tax code (or combination).
Totals groupTotals;
if (this.currentTotals.TryGetValue(groupKey, out groupTotals))
{
decimal previousTotalRoundedValue = groupTotals.TotalRoundedValue;
groupTotals.TotalNonRoundedValue += taxCodeAmountNonRounded;
decimal newRoundedTotal = taxContext.TaxCurrencyOperations.Round(groupTotals.TotalNonRoundedValue, taxCode.RoundingOff, taxCode.RoundingOffType);
decimal newTaxCodeAmountRounded = newRoundedTotal - previousTotalRoundedValue;
groupTotals.TotalRoundedValue = newRoundedTotal;
return(newTaxCodeAmountRounded);
}
else
{
groupTotals = new Totals
{
TotalNonRoundedValue = taxCodeAmountNonRounded,
TotalRoundedValue = taxContext.TaxCurrencyOperations.Round(taxCodeAmountNonRounded, taxCode.RoundingOff, taxCode.RoundingOffType)
};
this.currentTotals.Add(groupKey, groupTotals);
// no further adjustments needed since there are no previous lines for the tax code.
return(groupTotals.TotalRoundedValue);
}
}
else
{
// line (non-invoice) level, no tax code combination rounding is straight forward for given tax codes.
return(taxContext.TaxCurrencyOperations.Round(taxCodeAmountNonRounded, taxCode.RoundingOff, taxCode.RoundingOffType));
}
}
public TaxRepository(TaxContext context)
{
_context = context ?? throw new ArgumentNullException(nameof(context));
}
/// <summary>
/// Initializes a new instance of the <see cref="TaxCode"/> class.
/// </summary>
/// <param name="context">The request context.</param>
/// <param name="lineItem">The taxable line item.</param>
/// <param name="interval">The tax code interval.</param>
/// <param name="taxContext">Tax context.</param>
/// <param name="transaction">Current transaction.</param>
public TaxCode(RequestContext context, TaxableItem lineItem, TaxCodeInterval interval, TaxContext taxContext, SalesTransaction transaction)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (interval == null)
{
throw new ArgumentNullException("interval");
}
this.Code = interval.TaxCode;
this.TaxableEntity = lineItem;
this.TaxGroup = interval.TaxItemGroup;
this.Currency = interval.TaxCurrencyCode;
this.Exempt = interval.IsTaxExempt;
this.TaxBase = (TaxBase)interval.TaxBase;
this.TaxLimitBase = (TaxLimitBase)interval.TaxLimitBase;
this.TaxCalculationMethod = (TaxCalculationMode)interval.TaxCalculationMethod;
this.TaxOnTax = interval.TaxOnTax;
this.Unit = interval.TaxUnit;
this.RoundingOff = interval.TaxRoundOff;
this.RoundingOffType = Rounding.ConvertRoundOffTypeToRoundingMethod(interval.TaxRoundOffType);
this.CollectLimitMax = interval.TaxMaximum;
this.CollectLimitMin = interval.TaxMinimum;
this.TaxGroupRounding = interval.IsGroupRounding;
this.IsTaxIncludedInTax = interval.IsTaxIncludedInTax;
this.TaxIntervals = new Collection <TaxInterval>(new List <TaxInterval>(1));
// should this be removed in favor of intervals?
this.Value = interval.TaxValue;
this.TaxLimitMin = interval.TaxLimitMinimum;
this.TaxLimitMax = interval.TaxLimitMaximum;
this.RequestContext = context;
this.Transaction = transaction;
this.TaxIntervals.Add(new TaxInterval(interval.TaxLimitMinimum, interval.TaxLimitMaximum, interval.TaxValue));
this.TaxContext = taxContext;
}
/// <summary>
/// Gets the base price for tax included.
/// </summary>
/// <param name="taxableItem">The taxable item.</param>
/// <param name="codes">The codes.</param>
/// <param name="taxContext">The tax context.</param>
/// <returns>The base price for tax included.</returns>
public static decimal GetBasePriceForTaxIncluded(TaxableItem taxableItem, ReadOnlyCollection <TaxCode> codes, TaxContext taxContext)
{
// check to see if we can do the 'simple' Inclusive algorithm
bool simpleBasis = codes.All(c =>
(c.TaxBase == TaxBase.PercentPerNet || c.TaxBase == TaxBase.PercentGrossOnNet) &&
(c.TaxLimitMin == decimal.Zero && c.TaxLimitMax == decimal.Zero));
bool collectLimits = codes.Any(c => (c.CollectLimitMax != decimal.Zero || c.CollectLimitMin != decimal.Zero));
bool multiplePercentage = codes.Any(c => (c.TaxIntervals.Count > 1));
if (simpleBasis && !collectLimits && !multiplePercentage)
{
// Get base price for Simple TaxInclusive calculation
return(GetBasePriceSimpleTaxIncluded(taxableItem, codes));
}
else
{
// Get base price for Full TaxInclusive calculation
return(GetBasePriceAdvancedTaxIncluded(taxableItem, codes, collectLimits, taxContext));
}
}
public TaxDataProvider()
{
_ctx = new TaxContext();
}
private static decimal GetBasePriceAdvancedTaxIncluded(
TaxableItem taxableItem, ReadOnlyCollection <TaxCode> codes, bool collectLimits, TaxContext taxContext)
{
// accumulation of amount based tax
decimal fullLineUnitTax = decimal.Zero;
decimal nonExemptLineUnitTax = decimal.Zero;
decimal codeValue = decimal.Zero;
// AX variables
decimal endAmount = taxableItem.NetAmountWithAllInclusiveTaxPerUnit; // endAmount will be the final price w/o tax
int sign = 1;
// 3.
decimal taxLimitMax = decimal.Zero;
decimal taxLimitMin = decimal.Zero;
decimal startAmount = decimal.Zero;
// 3a...
decimal taxCalc = decimal.Zero;
decimal baseCur;
// Tax Amount deducted for a given Code
Dictionary <string, decimal> deductedTax = new Dictionary <string, decimal>();
// 3b ...
decimal percentTotal;
decimal tmpBase;
// 3c..
// Whether or not a Code needs to be removed from the sum of percent rates
Dictionary <string, bool> removePercent = new Dictionary <string, bool>();
// 3d.
decimal totalTax = decimal.Zero;
// Whether or not the Code needs to be calculated
Dictionary <string, bool> calcTax = new Dictionary <string, bool>();
string storeCurrency = taxContext.ChannelCurrency;
// Begin Tax included calculation
// 0. Initialize the supporting collections
foreach (TaxCode code in codes)
{
deductedTax[code.Code] = decimal.Zero;
removePercent[code.Code] = false;
calcTax[code.Code] = true;
}
// 1. Remove all AmountByUnit taxes
foreach (TaxCode code in codes.Where(c => c.TaxBase == TaxBase.AmountByUnit))
{
codeValue = code.Calculate(codes, false); // Reference dev item 5748.
fullLineUnitTax += codeValue;
nonExemptLineUnitTax += code.Exempt ? decimal.Zero : codeValue;
calcTax[code.Code] = false;
}
endAmount -= Math.Abs(nonExemptLineUnitTax);
// 2. Record the sign, and then continue using the magnitude of endAmount
sign = (endAmount < decimal.Zero) ? -1 : 1;
endAmount = Math.Abs(endAmount);
// 3.
while (startAmount < endAmount)
{
// 3a Consider interval limits
taxCalc = decimal.Zero;
taxLimitMax = decimal.Zero;
foreach (TaxCode code in codes)
{
if (code.TaxCalculationMethod == TaxCalculationMode.FullAmounts)
{
taxLimitMax = decimal.Zero;
}
else
{
if (code.IsStoreCurrency)
{
baseCur = taxContext.TaxCurrencyOperations.ConvertCurrency(storeCurrency, code.Currency, taxLimitMin);
}
else
{
baseCur = taxLimitMin;
}
baseCur += 1;
// if 'baseCur' falls into an interval
if (code.TaxIntervals.Exists(baseCur))
{
// get the Upper limit of the interval that 'baseCur'/'taxLimitMin' falls into
decimal amount = code.TaxIntervals.Find(taxLimitMin + 1).TaxLimitMax;
taxLimitMax = (amount != decimal.Zero && amount < endAmount) ? amount : endAmount;
}
}
taxCalc += deductedTax[code.Code];
}
// 3b. Sum up all the Tax Percentage Rates
percentTotal = 0;
tmpBase = (taxLimitMax > decimal.Zero) ? taxLimitMax : endAmount;
foreach (TaxCode code in codes.Where(c => calcTax[c.Code]))
{
percentTotal += GetPercentPerTax(code, tmpBase, codes);
}
decimal taxMax;
decimal baseInclTax;
decimal baseExclTax;
// 3c.
// if this is the last interval??
if (taxLimitMax == decimal.Zero)
{
// Forward calculate taxes to see if we exceed the CollectLimit
foreach (TaxCode code in codes.Where(c => calcTax[c.Code]))
{
taxMax = code.CollectLimitMax;
baseInclTax = endAmount - taxLimitMin - taxCalc;
baseExclTax = baseInclTax * 100 / (100 + percentTotal);
if (taxMax != decimal.Zero)
{
tmpBase = endAmount;
decimal percent = GetPercentPerTax(code, tmpBase, codes);
if ((deductedTax[code.Code] + (baseExclTax * percent / 100)) > taxMax)
{
deductedTax[code.Code] = taxMax;
removePercent[code.Code] = true;
}
}
}
// 3d.
// Now remove any rates that exceed their LimitMax
foreach (TaxCode code in codes)
{
if (removePercent[code.Code] && calcTax[code.Code])
{
tmpBase = endAmount;
percentTotal -= GetPercentPerTax(code, tmpBase, codes);
calcTax[code.Code] = false;
}
taxCalc += deductedTax[code.Code];
}
}
// 4. Compute tax adjusted for limits
totalTax = decimal.Zero;
foreach (TaxCode code in codes.Where(c => c.TaxBase != TaxBase.AmountByUnit))
{
if (calcTax[code.Code])
{
tmpBase = (taxLimitMax > decimal.Zero) ? taxLimitMax : endAmount;
decimal percent = GetPercentPerTax(code, tmpBase, codes);
if (taxLimitMax > decimal.Zero && taxLimitMax < endAmount)
{
deductedTax[code.Code] += (taxLimitMax - taxLimitMin) * percent / 100;
}
else
{
baseInclTax = endAmount - taxLimitMin - taxCalc;
baseExclTax = baseInclTax * 100 / (100 + percentTotal);
deductedTax[code.Code] += baseExclTax * percent / 100;
}
taxMax = code.CollectLimitMax;
if (taxMax > decimal.Zero && deductedTax[code.Code] > taxMax)
{
deductedTax[code.Code] = taxMax;
}
}
totalTax += deductedTax[code.Code];
}
if (taxLimitMax > decimal.Zero)
{
taxLimitMin = taxLimitMax;
startAmount = taxLimitMin + totalTax;
}
else
{
startAmount = endAmount;
}
} // END if( startAmount < endAmount)
// 5a. Total up taxes
foreach (TaxCode code in codes)
{
if (collectLimits && (deductedTax[code.Code] < code.CollectLimitMin))
{
totalTax -= deductedTax[code.Code];
deductedTax[code.Code] = decimal.Zero;
}
if (code.IsStoreCurrency)
{
taxCalc = Rounding.RoundToUnit(deductedTax[code.Code], code.RoundingOff, code.RoundingOffType);
}
else
{
taxCalc = deductedTax[code.Code];
}
totalTax += taxCalc - deductedTax[code.Code];
deductedTax[code.Code] = taxCalc;
}
// 5b. Determine base price
return((endAmount - totalTax) * sign);
}
/// <summary>
/// Initializes a new instance of the <see cref="TaxCodeProvider"/> class.
/// </summary>
/// <param name="taxContext">Tax context.</param>
internal TaxCodeProvider(TaxContext taxContext)
{
this.TaxContext = taxContext;
this.Identifier = "LSRetailPosis.TaxService.DefaultTaxProvider";
this.transactionTaxCodes = new Collection <TaxCode>();
}
public FinanceRepo(TaxContext c)
{
context = c;
}
/// <summary>
/// Initializes a new instance of the <see cref="TaxCodeIndia"/> class.
/// </summary>
/// <param name="context">The request context.</param>
/// <param name="taxableItem">The taxable line item.</param>
/// <param name="taxCodeInterval">The tax code interval.</param>
/// <param name="taxContext">Tax context.</param>
/// <param name="transaction">Current transaction.</param>
public TaxCodeIndia(
RequestContext context, TaxableItem taxableItem, TaxCodeIntervalIndia taxCodeInterval, TaxContext taxContext, SalesTransaction transaction)
: base(context, taxableItem, taxCodeInterval, taxContext, transaction)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (taxCodeInterval == null)
{
throw new ArgumentNullException("taxCodeInterval");
}
this.TaxType = taxCodeInterval.TaxType;
this.AbatementPercent = taxCodeInterval.AbatementPercent;
this.taxCodesInFormula = new List <string>();
}
/// <summary>
/// Initializes a new instance of the <see cref="TaxCodeProviderIndia"/> class.
/// </summary>
/// <param name="taxContext">Tax context.</param>
internal TaxCodeProviderIndia(TaxContext taxContext)
: base(taxContext)
{
}
public TaxDataProvider(TaxContext context)
{
_ctx = context;
}
public MunicipalityDataProvider()
{
_ctx = new TaxContext();
}
public MunicipalityDataProvider(TaxContext context)
{
_ctx = context;
}
public MunicipalityTaxService(TaxContext context)
{
_context = context;
}