Residential rent is described as input taxed. That means:
- No GST on the rental income
- GST cant be claimed on costs
The ABN is in respect of an ENTERPRISE eg a carpentry sole trader business. If you then also commence to plan, produce and sell a TV show like the Block your existing ABN might not cover it. You may need a new ABN for that enterprise. The practical way the ATO do that is to add a further branch number to the ABN....ie the first one is 001...(Most people ignore it)
So the existing ABN has nothing to do with IPs.