The price list for Europe/UK are inclusive of the local VAT price. For example if ship to Asia, they will deduct the VAT. As for US the price listed are before tax. Either way you will still be liable for your local tax if applicable.
If buy from NAP, you have to set the country in the webpage correctly so that it will reflect the correct price, usually it's done automatically. According to the shipping info-delivery duty paid, the SG tax is already calculated and added into the final price, this mean you don't have to pay your local tax seperately. You can check the details on the website.