Setting up TAX for all Countries

[tsvenkat]

In my OSC Shop, all products will be charged 17.5% VAT during the final checkout.

 

Now I have created a TAX Rate and added UNITED KINGDOM as the Tax zone. When the customer is from UK, the tax part works perfectly.

 

Now what I need is, wherever the customer may be (in the world), the tax clause should work.

 

how to set this ?