I don't get the tax (21%) calculate on top of the price set in the subscription plan.

Tax plugin is installed and enabled.

In tax settings icon following setting is configured:
New tax rule is made
and tax rate of 21% has been added in tax settings.

In settings/tax following setting is configured:
Taxes computation enabled:YES

In plan/tax the setting is configured:
Tax rule to apply: Default tax rule is applied

Still no tax is calculated!?
Somebody knows what is going wrong?