How are import charges calculated?

[icollectthings]

Hi, I am wanting to buy something from the US and the value is $325, with $86 shipping and $115 import charges.

The thing I don't like is, until I actually pay for the item, import charges can change.

The thing is, the person has best offer activted on the listing, so if I were to say, offer $250 and had it accepted, would the import charges lower, or could they still even go up.

I think it's a bit of a bad system were I cant know the final fee until I actually commit to buying the item.

Thanks

[tobiasd4]

Looks like seller is part of GSP.

Import fees on listing are only an estimate, total will only be known when final price is known.

[icollectthings]

Thanks for the reply.
The item is part of GSP yes.
Thats the thing though, how can I buy something if I don't know what the final fee will be!?

If I have a budget I want to stick to, I'd like to offer an amount and have the import charges calculated within that bid, so I know if accepted, this is the final fee.

Surely their must be some sort of calculation
Thanks