If you live in Australia or the UK, your deliveries are shipped on a DDP (Delivery Duty Paid) system, so you won't pay any additional fees when your order ships or crosses a border. Duties and taxes are calculated directly into your shipping costs and are taken care of on check out. Please note that this means duties and taxes are non-refundable.
Canada operates on a DDU (Delivery Duty Unpaid) basis, which means your duties and taxes are charged on delivery rather than at checkout. Paying these taxes releases your order from customs. If you have any questions, your local customs office can assist you best.