Need Help Related to tax calculation

[limtex_tester]

Let us assume there are two tax class

class A and class B

tax rate for class A is 4 % and Tax rate for Class B is 5%

Now , product 1 belongs to tax class a and product B belongs to class B.

Let us assume that both of these tax class is applicable for all country all zone.

Suppose price of Product 1 is 100 and price of product B is 200.


Now i installed specials offer module where we can offer special offer on the

combination of two products either by offering some percentage deduction on their sum of

price or by flat discount in terms of rupees from their sum of price ,that is if we

purchase two products together then price will be less than if we purchase them

separately.


special offer of 10% off on their sum of price is offered on the combination Product A

and Product B . so after special offer their together price is now

[ { 200 + 100 } -(300 *10%) ]=270



Now a customer opt this special offer and add this combination of product a and product b

in his shopping cat. so now in his cart [Product A + Product B] and he now continue

shopping and add Product A in his cart.

so now in his cart special offer product ( i.e Product A + product b] And another

Product A .SO his cart Is like this [ (Product A + Product B ) + Product A ]

Now at the time of checkout how the tax will be calculated ? can any one help me ,i am

getting confuse what will be the logic for the tax calculation .Please help me if u show

the calculation logic in equation format then it will be very help full for me.

[limtex_tester]

For the above example if we use discount coupon then the tax for individual product was calculated on the deduced price after using the discount coupon.that is for example product A base price was 100 but as we use discount coupon (10% off) so its deduced price is 90 and that why tax for the Product a is 4% of 90 and it is 3.6 and tax for product B is also calculated in the same way.

so my question is that ,As the [ product A+ Product B ] are in a special offer ,

that is if we purchase two products together then price will be less than if we purchase them separately.

so in case of special offer product [ product A+ Product B ] is there any formula to calculate tax of individual product or the tax will be calculated on their base price. i need this information.

[pgmarshall]

Hi there - and welcome to osCmax!

I suspect your issue is not to do with the tax setup. Assuming you have set up your taxes and zones correctly the tax should work fine - it is the order in which you have executing the total that is the issue.

Go to your admin panel -> Modules -> Order totals.

There you should see some settings which determine the ORDER in which different parts of the total are combined.

Read this in the wiki to get you started.

Regards,

[limtex_tester]

The name of the add on is 2gether discount , the code is below.

function process() {
global $order, $currencies, $ot_subtotal, $cart, $together_product_names;

$od_amount = $this->calculate_2gether_discount();

if ($od_amount > 0) {
$this->deduction = $od_amount;
$this->output[] = array('title' => sprintf(MODULE_2GETHER_DISCOUNT_FORMATED_TITLE, $together_product_names),
'text' => sprintf(MODULE_2GETHER_DISCOUNT_FORMATED_TEXT, $currencies->format($od_amount)),
'value' => $od_amount);

/*****START_TAX_CALCULATIONS*****/
$discount_percentage = ($od_amount/$order->info['subtotal']);

if ($order->info['tax'] > 0) {

$tod_amount = ($order->info['tax'] * $discount_percentage);
reset($order->info['tax_groups']);

while (list($key, $value) = each($order->info['tax_groups'])) {

$god_amount = $value * $discount_percentage;
$order->info['tax_groups'][$key] = $order->info['tax_groups'][$key] - $god_amount;
}
}

// $order->info['total'] -= $order->info['tax'];
$order->info['total'] -= $this->deduction;
$order->info['tax'] -= $tod_amount;
// $order->info['total'] = ($order->info['total'] - $od_amount) + $order->info['tax'];
/*****END_TAX_CALCULATIONS*****/

if ($this->sort_order < $ot_subtotal->sort_order) $order->info['subtotal'] -= $this->deduction;
}
}


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can any one explain me the code of the tax calculation section . how the tax are getting calculated .