Sales Tax incorrect with percentage discount coupon

[coryinit]

V1.3.8a

I'm having an issue with a 25% discount coupon. When I use it on the order of one item, the tax is calculated incorrectly. For example

Sub-Total: 11.00
United Parcel Service (Ground): $6.88
Discount Coupon: Patriot : -$2.75
NE TAX 5.5%: $0.74
Total: $15.87

The tax should actually be $.83 since we tax shipping in the state:
11.00 + 6.88 - 2.75 = 15.13
15.13 * .055 = 0.83215

The ot_coupon module is configured as follows:
<><><><><><><
This module is installed
true
Sort Order
280
Include Shipping
false
Include Tax
false
Re-calculate Tax
Standard
Tax Class
--none--
<><><><><><><

Any help would be appreciated. I've read much related to miscalculation of VAT taxes, but all of those issues seemed related to quantity discounts and coupons.

Thanks.

[sgt_slaughter]

I'm having the exact same issue with a 15% coupon. I have the same settings in the coupon admin, just a different tax rate where I am.

Were you able to resolve this issue?

Thanks,

[sgt_slaughter]

I determined what the issue is, just don't know how to fix it.

The Discount Coupon when it recalculates the Tax it does the following:

Tax = (Subtotal - %15) * Tax Rate + (Shipping - %15) * Tax Rate

Even though we have "Include Shipping" = False in the config.

The Shipping is not included in the Discount Coupon amount though, so it half works, just not perfect...

Any solutions would be a great help.

Thanks!

[sgt_slaughter]

In looking at this further It appears the issue is in file:
/includes/modules/order_total/ot_coupon.php

Lines 65-70:
while (list($key, $value) = each($order->info['tax_groups'])) {
if ($od_amount['tax_groups'][$key]) {
$order->info['tax_groups'][$key] -= $od_amount['tax_groups'][$key];
$tax += $od_amount['tax_groups'][$key];
}
}


How do I add an If statement to check if $this->include_shipping is false and the $key,$value is the class "ot_shipping" and ignore it for tax purposes?

Potentially I'm not looking in the right place, but I should be close...

[largomike1]

I had the same problem. I can't believe it, but I figured it out by chance! Try this out, and see if it works for you.

1- Create a coupon code (if you don't have one already).
2- In your Admin area go to Modules->Order Total
3- Choose Discount Coupon Module
4- Click Edit and set the Recalculate Tax option to Standard.

That's what worked for me. I tested an order and it calculated the tax correctly. Let me know if it works for you.

You're welcome to try it out on my site at - pursebling.com. I setup a coupon code you can use: zencarters It's good for 10% off. We only charge tax for the state of Florida. So if you're trying to test this out on my site, you'll have to create a shipping address with Florida as the state.

Hope this helps!

[GG01]

This doesn't work for me. Has anyone found a solution to this problem??