I'm an Australian citizen living in the UK and I work full time and pay tax in the UK. I've been approached by an old friend who has established a consultancy business in Australia and I would be doing remote work for them on an ad hoc basis. All work would be conducted by me remotely, from the UK. I have an Australian bank account so I would be paid by the business into my Australian account and I would transfer the money to my UK bank account periodically. I do not qualify for an ABN (did try and application was rejected as not carrying out work in Australia).
I want to establish what my tax obligations would be in Australia and the UK? Would I declare the income on my Australian tax return and/or complete a Self Assessment tax return in the UK? This would be a secondary job for me; I'm already paying income tax in the UK related to my primary full time job. I hold an Ancestry visa in the UK and can work freely.
I'm just not really sure where to start on how to make sure I'm doing the right thing in both countries.