Calculating the V.A.T. amount from the total price
Sometimes you need to calculate the V.A.T. (for Germans: MwSt.) from a given total price. This is, for example, if you charge an arbitrary total price, but need to display the V.A.T. percentage along with the V.A.T. amount. For this purpose, you can use the following code:
PHP:
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<?php
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function calc_vat_amount_from_total($total, $vat)
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{
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$total = (float)$total;
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$vat = (float)$vat;
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if (!$total || !$vat) return false;
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$net = $total / (float)('1.'.$vat);
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$vatAmount = $total - $net;
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}
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$total = '35.00'; // It's a string, but could also be a float or int.
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$vat = '19'; // dito
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$vat_amount = calc_vat_amount_from_total($total, $vat);
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echo "The ticket fare of $total € contains $vat% V.A.T. ($vat_amount €).";
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?>
