In October, I bought a $250 product from a Canadian company + about $30 shipping & taxes and thought I was good. A few weeks later, FedEx sends me an $92 bill for the duty that they had to pay. I just ignored it since I was never given that notice up front. If they really wanted it, they could have had the vendor contact me. But at least they're not getting that bit of profit now.

I'm also ignoring a bill, from UPS, that is a few bucks of duty and a much larger $14 fee. Presumably the large fee is because UPS isn't meant to collect taxes, but they can suck it.

For what it’s worth, FedEx paid the tariff on your behalf .

You owe them, and I wouldn’t be surprised if they withhold future packages to your address until you settle up.