Products Price nett =gross

[aarbee]

I have a problem that, no matter what I do, the Gross price is equal to the nett price.
I have been reading numerous titles, but probably all at the wrong setup.

It is about this site www.site4phones.com. Still having all default stuff in it.

Version 1.3.9H

What have I done so far:
Created a Zone:
Netherlands Nederland NL

Zone defenition:
Netherlands Dutch local sales tax zone

Tax Classes
ID Tax Classes
1 19
2 6

Tax Rates
Priority Tax Class Zone Tax Rate Description:
0 19 Netherlands 19% BTW 19.0%

Product Types
Product - General
Edit Layout
Product Price Tax Class Default - When adding new products? 1

When I add a new article, And choose Tax Class 19 and add under Nett a price of 100, I would expect a price of 119 under gross, but Gross also takes the price equal to 100.

I do not know where I have to do a setting, so it becomes 119 under Gross.

Greetings,

RobB