[Typo3-shop] Tax calculation incorrect?

[JoH]

> In our soon-to-be online shop the price without tax
> (PRICE_TOTAL_NO_TAX) is not calculated correctly.
> We use these settings for the price calculation:
>    TAXpercentage = 16.00
>    TAXincluded = 1
>
> Example:
> When the total price (PRICE_TOTAL_TAX) is 10.00 euro, then the price
> without tax (PRICE_TOTAL_NO_TAX) is calculated as '8.62', but the
> correct amount would be '8.40' euro. The difference is 0.22 euro.
>
> With a product that costs 1000 euro (PRICE_TOTAL_TAX), the
> PRICE_TOTAL_NO_TAX is calculated as 862.07 euro, but it should be 840
> euro. The difference of 22.07 euro is a bit more significant.
>
> Is anyone else experiencing this? Where does this difference come
> from?

You should try to correct your understanding of percentage calculation ;-)

840 + 16% = 840 * 1.16 = 974,40 != 1000
862.07 + 16% = 862.07 * 1.16 = 1000,00(12)

If the price X is including 16% Tax the "No Tax" price is

X/1.16

So the example calculation is correct.

Joey

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