How are import charges calculated?

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

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