Shipping into the US from the UK

Hi everyone,

I’d really appreciate your input,

I’ve been running into some confusion with international shipping, especially when it comes to customs codes and how platforms calculate duties.

For example, I recently simulated a shipment for a product valued at $99 USD, and the system estimated $48 USD in duties, which seems way too high. I suspect multiple tariffs are being stacked incorrectly.

For those of you who ship regularly to the U.S., how do you handle:

HS code selection?

Avoiding inflated duty rates?

Customs declarations that actually match CBP logic?

Any tips or examples would be super helpful.

Thanks in advance!