First it depends on the item is it is concidered duty exempt by the Harminized Tarrif Schedule USA. Depending on the comodity it can be exempt any duty. Once the rate is determined (if any), local/state may pose a have a limit on the comodity.
customs
custom duty on glass imports from Pakistan to India
its zero percentage,means duty free from 2012.
excise taxes
no
Since you must declare purchases made in Canada when you cross the border into USA, yes, expect to pay a duty. You must also declare any imports you expect to leave in USA. Also, it is a federal offense to 'forget' to declare purchases or imports. As well, you may be asked by Canadian customs to declare purchases and imports, in which case you should expect to pay a duty. It is also a federal offense to 'forget' to declare purchases or imports in this process, too.
The US border guard asked Megan to pay the customs duty for the antiques she had purchased in Canada before she was allowed to drive on to Seattle.
Yes, if its value exceeds the amount you are allowed to bring in duty free.
Customs duties are basically excise taxes on imports.
duty tax
The customs agency which collects taxes on imports and exports.
No - you would need to import them through customs yourself, and pay the duty levied on them.