Just posting here to describe my experience from using Fedex to ship a laptop from the states. Before I purchase the laptop, I saw that the seller was going to use Fedex to deliver my package. Therefore, I went online and used the Fedex shipping calculator (was advised by someone to do so) to calculate the total shipping to my doorstep exclusive of GST.

Since my laptop should not be charged import duties, I was only supposed to pay the GST of 6% for the laptop. After calculating I went forward with asking a quotation from the seller regarding the shipping charges and the tax to be paid. The seller quoted me the shipping charges (which was around 3 dollars difference from what I calculated) and told me that any import duties and tax shall vary according to the buyer's resident country. So I went forward with the order and waited for updates from Fedex.

Long story short, in the end I just need to pay the GST to Customs before I am able to receive my package. No extra costs and charges. This is a one time experience though and should only be taken as reference and not as a sure thing that Fedex did not do what they had mentioned above.