Is an ABN required on every invoice?

Is an ABN required on every invoice if I self manage my NDIS plan? The short answer is no. The NDIS requires all transactions to be legal, as does the ATO, but an ABN is not the be all and end all of options. If, as a self manager, you ask your neighbour to make some alterations to your jeans because you’ve got one leg, or you buy a secondhand shower chair off another family on Gumtree, they do not…