HK_Katherine is right and that website has definitely changed in the last year and the requirements stated on it have been relaxed a little. I did mine a year or so ago and was a super piss easy process, but the website did used to list more supporting documents required. I printed out 7 years worth of tax returns from memory. But in reality they didnt use it, I rocked up to the immigration tower, had a 30 second interview through a glass window, and they said congrats you are a PR. They didnt use all the evidence their website previously said they needed. It's good to see they have updated their website sometime in the last year.