Ann: Market Update, page-66

My understanding is that it is the same net effect as reporting your cash receivable and payables in Australia as including GST - when in fact you need to pay the net GST to the ATO, so a 220K contract (gross) becomes a $200K contract (net of GST). At the same time, your payment to suppliers of ($220K) (gross), becomes a net payment of $200K.

The negatives and positives cancelled each other out (convenient - or logical, I really can't tell?) - so the net "cash in bank" amount is the same.