Pricing removes tax

The product is £1100 before adding any pricing rules. I have added two options, left or right handed. I have added a product fee of 83.33 to left handed.

Now when the product loads the price bas price is 916.66 (that is 1100 without tax) and then selecting left handed the price does increase to 1000, (1100 + 83 without tax)

All products on the site are entered without tax and woocommerce adds tax at 20%.

Is there away to have the plugin stop removing the tax?

Cheers