You just need your notice of assessment, if you work cash you just simply notify and add it in your taxes. They asked me my notice of assessment of 5 years from now.You may need to get more opinion but I think you need to submit statements of account and prove of job and possibly T4 if you have. You may explain that you have been doing cash jobs and include proves. Most terrible is not to have a way of supporting yourself and taking government money.
In all, pray for a good officer to attend your file.
He specify he doesn't have t4, t4 is when you have a contract he is working as a independent contractor.... the best way to proof he has different incomes is going to an accountant who has experience in these cases.
In my personal case I worked 3 years with t4 and afterwards my SIN expired, I worked cash jobs for 5 years and I file my taxes with my own company, also I had a part time job, I file also a part of my income there.
My advisor explained that it is very simple, I can't be hired by any company which provide t4, however as an independent contractor is a different story.....I hope that works