Is it acceptable to make a payment in advance that includes the GST amount ?

This discussion explores the acceptability of paying GST in advance for goods ordered from a supplier. While contractually possible, the consensus is that GST liability for goods typically arises only upon invoice issuance. It's suggested that it's reasonable to deny an advance payment including GST, especially for significant amounts, as the supplier isn't liable for GST on advance payments for goods. This approach helps avoid losing out on potential interest earned on the advance GST amount.