Amazon says it will block Australian consumers from its global sites to avoid new GST laws.

New regulations starting from July 1 will require online retailers to apply GST to goods bought on international sites and sent to Australia.

From that date, Australian consumers on Amazon international sites will be redirected to the local Australian site, which has a significantly reduced range of goods.

Reports say Amazon could not handle the massive administrative burden of tracking Australian GST from all overseas transactions.

Meanwhile, eBay says it will change its global systems so that Australian shoppers can still buy items from anywhere in the world.