Tax not applied to shipping cost

Hello,

I use your plugin on a website where I need to apply a tax (V.A.T.) on the shipping cost for a specific country.
I’ve checked the checkbox “Taxable” when I created the shipping method that will include the Flexible shipping method.
But when I test the result, the price of the cart is taxed but not the shipping cost.
Is it a bug or is it a feature that do not exist yet with your plugin ?

Thank you.