Read the IRS tax publications. You have to have a minimum amount of income to meet the requirement to file. That is how all those poor people get by without paying or filing. My last two years before not filing I was working for a company and made over 60 K each year. Then went 5 years without enough income to file. Was doing the starving writers gig. All legal. All legit.
That's fine. But how does the IRS know you've met that requirement? Did you just call them up?
Remember that paper trail you mentioned earlier?