---
title: Tax calculator
slug: commerce-connect-14/docs/calculating-orders-tax-calculator
docTags: 
createdAt: 2026-07-23T10:25:32.641Z
---

## Sales tax

Calculates sales tax for a single line item based on market, shipping address, and base price. \[New in 13.0.0.]

```csharp
public Money CalculateSalesTax(ILineItem lineItem, IMarket market, IOrderAddress shippingAddress, Money basePrice, ITaxcalculator taxCalculator)
          {
            return taxCalculator.GetSalesTax(lineItem, market, shippingAddress, basePrice);
          }
```

Calculates sales tax for line items based on market, shipping address and currency. \[New in 13.0.0]

```csharp
public Money CalculateSalesTax(IEnumerable<ILineItem> lineItems, 
                                       IMarket market, 
                                       IOrderAddress shippingAddress, 
                                       Currency currency, 
                                       ITaxCalculator taxCalculator)
          {
            return taxCalculator.GetSalesTax(lineItems, market, shippingAddress, currency);
          }
```

## Change the default calculation

By inheriting from the default implementation of the interface, `DefaultTaxCalculator`, you can override the calculation of get tax value and get tax category name. Just override one or several methods in the `DefaultTaxCalculator`.

```csharp
public class TaxCalculatorOverridingDefault : DefaultTaxCalculator
      {
        public TaxCalculatorOverridingDefault(IContentRepository contentRepository, ReferenceConverter referenceConverter)
          : base(contentRepository, referenceConverter)
          { }
        protected override string GetTaxCategoryNameById(int taxCategoryId)
          {
            return string.Empty;
          }
        protected override IEnumerable<ITaxValue> GetTaxValues(string taxCategory, string languageCode, IOrderAddress orderAddress)
          {
            return new List<ITaxValue>() { new TaxValue(10, "SalesTax", "clothing", TaxType.SalesTax) };
          }
      }
```