Счета Демо

All of these requirements are present in 1.0.1
You should change plugin settings.
1) Change template to modern and contact info will be in the left
2) change flag Include tax in total and tax will be calculated as you need

Here is an example http://redminecrm.com/invoices/6

You are right! After changing my settings, this works as expected.

There is just one tiny thing, which could improve the usability much. In the printed version of the invoice (PDF) the customer phone number is also displayed in the address field. That's not a common thing in invoices. I always have to edit the customer address manually in order to remove it before printing the invoice. It would be very useful, if you remove it from the invoice data in general.

Customer phone numbers are a sensitive peace of data. They should not be placed into the address field, which is readable for everyone who looks at the letter address. Moreover it is not necessary to place it onto the invoice itself.

Fine, all will add settings for selection which contacts fields should displayed in PDF invoice