Just wanted to see if anyone knows if you have to pay tax on goods purchased second hand from america? Im about to buy some group 4's, just worried that once it gets here im going to be stamped with a huge customs/tax fee..

You will get taxed with 5% duty and 10% GST, unless the value dollar amount on the custom form is forged (which is illegal in any country).

5% and 10% of what though? There will be no invoice attatched to it as its 2nd hand/private sale?

10% GST on total(item + shipping + customs handling fee if it a heavy item)....if your un-lucky.

Item value will be put on shipping declaration.