That’s not entirely correct and whilst this is an extremely annoying occurrence, there is no “one way” fix that gets this right every time mostly because as @tut mentioned, it can be done either way is some systems.
Generally most big suppliers use the line-by-line rounding method and so this is great, but a lot of suppliers (especially using manual invoicing) don’t.
I come across this problem repeatedly as I have suppliers that do it on a total, some give invoices where GST is added at the end (therefore the invoice is ex-GST) and others that give it line by line, and the problem persists.
Even using the the suggested method of “tax inclusive” isn’t a fix as it can still fail by this $0.01 because of the suppliers use of one of the tax permitted approaches.
Not directed at Joel91 and just a generic comment (Hi @lubos ! lol) I still feel strongly there needs to be a way of adjusting GST on an invoice by invoice basis, because you can’t simply create one line of adjustment since in most of my cases it’s ONLY the GST that is out. Adding an adjustment may make the GST correct, but then puts the invoice amount out.
I am not able to change the mind of my suppliers in this regard, and because the ATO (Australian) allows both methods, I can’t say to them they really should do it this way or that. I just suck it up that it’s one cent out.
And trust me, this OCD brain of mine doesn’t like it.
I thought I would add, that one of my “suppliers” is a multi-national multi-billion dollar company that services thousands of clients in Australia alone. It’s rare that i can get past a Filipino call centre let alone anyone that will actually listen to, and understand my frustration with their billing 