Tax Do Not Add

I'm using Version 1.4.9.6 - I already followed all tutorials in this forum about the Tax but I still have no success.
I already created the zone, geozone, tax class, add to the product but still no success.
The checkout details only display the actual total price of the item. I also configured the settings Not to Display Price with Tax and tried as well the option Display with Tax but the catalog and check-out only provide the actual product price.

Thanks for the help in advance.

question 1

what is the price of one of your products? (i mean the input price from admin)

question 2

what is the price displayed in the store (with Display price with tax enabled)

question 3

what rate of tax have you set for your own geo-zone?

Please answer these questions to narrow down your issue.

thank you SXGuy, i already found my mistake here. appreciate your help.