Hi!

When we try to complete shipment we get the following error "Incorrect authorization total. Expected: 43.600000000, but Actual is: 54.500000000".

Our solution required us to override the DefaultTaxCalculator, which have worked well and we don't come aqross any issues until trying to complete a shipment.

Parts of the implementation of the overrideing DefaultTaxCalculator can be seen below

public class OverrideDefaultTaxCalculator : DefaultTaxCalculator
{
    protected override Money CalculateTaxTotal(IOrderForm orderForm, IMarket market, Currency currency)
    {
        if (!ShouldTax(orderForm, currency))
        {
            return new Money(0, currency);
        }

        return base.CalculateTaxTotal(orderForm, market, currency);
    }

    protected override Money CalculateTaxTotal(IOrderGroup orderGroup, IMarket market, Currency currency)
    {
        if (!ShouldTax(orderGroup, currency))
        {
            return new Money(0, currency);
        }

        return base.CalculateTaxTotal(orderGroup, market, currency);
    }

    protected override Money CalculateShippingTaxTotal(IShipment shipment, IMarket market, Currency currency)
    {
        if (!ShouldTax(shipment, currency))
        {
            return new Money(0, currency);
        }

        return base.CalculateShippingTaxTotal(shipment, market, currency);
    }

    protected override Money CalculateShippingReturnTaxTotal(IShipment shipment, IMarket market, Currency currency)
    {
        if (!ShouldTax(shipment, currency))
        {
            return new Money(0, currency);
        }

        return base.CalculateShippingReturnTaxTotal(shipment, market, currency);
    }
}

This example is an order which is treated with the exception of not following the standard tax rules in the system. 

All the summaries seems to be correct, it does not add the tax on the order.

However we still get the error stated above. I can see the OverrideDefaultTaxCalculator gets called and is returning as expected.

Is there more tax calculators that I'm not aware of that does its final check on "Complete Shipment"?