So for the piddly amount of return on the massive amount of work:
You set your price not Apple
1. Start an entirely irrelevant Tax Return in a foreign country*
Go to work for New York Fire Department, you get paid, you get taxed - get back to Oz in the middle of a tax year.. you have to declare your income "from all sources" on your Au tax return... BUT you dont get taxed on it again....
2. Be taxed in the hope of getting it back later
DO you have an ABN?.. any body can apply - but you declare nothing if you earn nothing... earn $1 and you need to declare it! and you every year file an ABN related tax entry.
Putting a book (s) in the store is hoping it sells well and earns you money- its not an obligation.
3. Claim Apple's cut as a cost from the gross amount taxed.
Dont know aussie rules, but years ago, I could claim "cost of sales" on anything related to promoting and making sales. Its tax deductable. I am sure it applies in every country.
4. Pay for a foreign tax expert and lawyer to work this all out for you
Pay an Aussie tax expert if you are in aussie - which is where you pay your tax, he/she/they will work out overseas earning/tax and make the adjustments. You dont pay twice.
5. Pay tax again in Australia
You dont pay twice.
Whatever tax you are due to pay in your normal employmeny needs to be paid.
if - for example you are a carpenter and along comes a mate just bought a shop and want some new fixtures and fittings and pays you $5ooo..... do you declare it or hope you dont get caught.... cos your mate will claim it back as an expence to offset his tax bill!
If you create a new book about Flappy Birds and it earns you $50,000 are you worried about 20% tax? You only pay it - if you made it.
* Apple has the gall to charge us GST and local taxes here in Australia to justify its higher "costs", then tells the Australian Tax Office that the transaction did not take place here in Australia, but in Singapore, therefore Apple should not pay Australian tax.
Apple Australia is a different branch of Apple to the USA branches - so like any Aussie business from whom you buy... the AU law says you pay 10% GST - not Apple.
Item shipped into AU incur import tax, not Apples fault.. AU law.
How Apple runs its tax obligations with AU - I have no knowledge, but Google and others are the same - they have smart accountants to sort it out.........
So........
Everything is quite simple really, before you join anything you get to know the rules, requirments and obligations.
Apple does not send out "Press Gangs" to leap on the unwary and make them buy products from Apple or download free software and make books in the hope you will will make millions ( less 30% ), it your choice and yours alone.
What you dont like, dont get involved with....