This tutorial shows how to show product price including tax on the product view page in your Magento template.
1. Navigate to System->Configuration->Sales->Tax;
2. Then in Calculation settings-> Catalog Prices set it to INCLUDING TAX:
3. Now save the configuration and go to the Catalog->Manage Products;
4. Edit the required product. In the Prices tab it has to show the tax value below the field where we enter price for the product:
Feel free to check the detailed video tutorial below: