I had this happen to me on an order from Sweden. The order was about $450 + $50 shipping. I used an online tariff calculator and it said it should be 15%. So I was expecting ~$70. A few days before it is supposed to arrive UPS sends me a $242 bill for “tariffs, customs, and brokerage fees”. That basically made it 50% more expensive, but it was either pay it or loose the item. A month later they sent me an invoice tha…
The other option is to prepay tarrifs during the purchase of an item. Fedex and DHL usually offer this service which includes epedited customs clearance.