Three numbers that mean different things
A tax threshold, a simplified-entry limit and a shipping quote are different things. In the US, the $2,500 postal informal-entry limit does not make an order duty-free. In the EU, the €3 measure is based on tariff categories within an eligible low-value parcel. In Great Britain, £135 affects VAT collection and duty treatment.
US CBP postal guidance ↗ · European Commission low-value guidance ↗ · GOV.UK import charges ↗
Ask about the total, in writing
Keep the product price, domestic delivery, international freight, import VAT, duty and carrier fees as separate rows in your own sheet. If a route is described as tax-inclusive, ask which charges it covers and whether there can be an adjustment after assessment.
A useful question for the route provider
“For this destination and these item descriptions, which import taxes and clearance fees are included in the quotation, and who handles any amount collected on arrival?”
Use the actual order details
Preserve the paid value and accurate descriptions. A personal purchase does not become a gift because it is for your own use. Do not build the budget around an invented per-kilogram declaration or another buyer’s parcel outcome.