Problem with tax in Virtuemart - Joomla! Forum - community, help and support

i've big problem  think brother me.
this is:
i have fixed in 0.20 tax in italy in virtuemart in order when calculate price mistake.
example: 120 euro+ tax 20% = 144 euro, no in virtuemart calculate 120 euro+tax 20% = 140 euro mistake.

could me? thank you.

have fixed problem? have similiar problem, since virtuemart adding 0,02€ every total ...

regards,
goldie.