I have a suspicion that someone offering a small jobs (locks, painting, etc) service in Sydney isn't likely to be invoicing many mining giants...
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I have a relation who does lawnmowing and small odd jobs for local real estate agents with rental properties. He has an ABN and does returns etc, seems to be getting lots of regular work charging $45 an hour, so it can be done.
might need some painting done down the track, drop me a pm when your set up. :)