hi all, I read for 2 hours through Google and not able to find answer. I know PC would be the best venue. I have recently contracted a builder for granny flat. all done with payment and all. when I asked for invoice, he said that the signed contract between us would be enough evidence for tax purpose. The contract is very details with amounts, name, address, ABN etc... could anyone advise me whether that is enough? OR I should press for invoice? The total cost is more than $100K (including GST). I transfer payments through Internet Banking. Thanks in advance.