Magento 1.x Quote vs Order tax rounding issue

[seansan]

Hi, we are seeing a Quote vs Order tax rounding issue (1.9.3.x) and though I'd report it here.

In short, when we apply discounts for the following order

• product 59,95
• discount 10%
• grandtotal = 53,955

we see that

• quote totals are 95,96 using
  $totals = $this->_getQuote()->getTotals();
$totals['grand_total']->getValue(); or $this->_getQuote()->getGrandTotal()
• and order $order->getGrandTotal() = instance 95,95

May be related to here
magento/magento2#446

Problem is that 1 API uses quote to start a process in our ios app. And later tries to link this back to the order. But this never succeeds, because there is a 1 cent difference

Was this issue adressed before? I read a lot about rounding issues but nothing specific to this case other then Kristoffs post above

[tomekjordan]

Hi. I saw similar things when I used bundles and discounts, when I used Paypal with discounts, when I used points rewards extensions discounts in shopping cart.
I see many times subtotal differes than row total - no matter what tax calculation method I use. The best so far is row total, while by unit makes this even worse (but should be the best method to calculate)

Looks like this is still a problem - in many cases - at least in 1.9.3.x

[kanevbg]

It seems I am hitting this same thing

[rafaelpatro]

Same to me.

The issue is related to this method I guess:

magento-lts/app/code/core/Mage/Core/Model/Store.php

Line 995 in 8763054

return round($price, 2);

roundPrice is widely applied

magento-lts/app/code/core/Mage/Sales/Model/Quote/Address/Total/Grand.php

Line 49 in 77a837a

$totals = $store->roundPrice($totals);

Maybe truncating could be a solution:

    public function roundPrice($price)
    {
        return intval($price * 100) / 100;
    }

[addison74]

This issue was reported 5 years ago and updated in 2019. What can we do with it? Create a PR if it confirms?