How to show the tax base in the invoice?

Hello, I need a customization in Hikashop Essential on the invoice at backend to show the tax base for each tax type. I need also show the shipping price without tax.

How can I do it?
i send a capture of i want to say.

Thanks in advance and sorry for my english.

I have another problem with de taxes, rounding not perform well.
I have a product that its price is 2.81 € and has a rate of 4% which is equal to 0.1124 €, hikashop rounds the tax rate to 0.11 € (is ok) but if the user buys 15 units the price is € 40.50 and your tax € 1.62 and Hikashop estimated tax of 1.65 €.

Thanks Hikashop team, I install the plugin www.hikashop.com/forum/4-how-to/26113-us...art=20&lang=fr#46304 , and the calculation is OK

For the tax base, you will have to edit the file "invoice" of the view "order" of your back end template via the menu Display->Views and add the code:
<?php echo '(tax base:'.$tax->tax_amount/$tax->tax_rate .')'; ?>

before the line:
<?php echo $tax->tax_namekey; ?>

Hi Nicolas, there is a problem , if I active yhe plugin custom_quantity_tax i can't use Full tax display

It doesn't work ?
Do you have an error ?
Could you give more information please ?