Wrong tax totals per vat and also wrong gross total

[charkoulis]

Scenario
2 products with 1.96 unit price including tax 13% -> 1.73 without tax
2 products with 0.04 unit price including tax 24% -> 0.03 without tax

$line->setName('Product 1')
            ->setPrice(1.73)
            ->setVatRate(13)
            ->setQuantity(2);

$line->setName('Product 2')
            ->setPrice(0.03)
            ->setVatRate(24)
            ->setQuantity(2);

The totals should be equal to 4 but it is calculated as 3.98.
It seems that it loses 0.01 per tax rate because the rounding is being applied at the total and not on each unit price separately.

[josemmo]

Hi, @charkoulis!

For better or worse, that's how rounding works in the specification.

To account for these issues, you can make use of the rounding amount field (BT-114):

// [...]
$invoice->setRoundingAmount(0.02);

[charkoulis]

Hi @josemmo

Even if i fix the total amount with the setRoundingAmount function, the taxAmount for each VAT will still be wrong.