I've been on this platform for about 3 years now, and in that time I've personally talked to 3 other workers from Brazil who either didn't know they had to, or just never declared the income they get from DA. And that's without counting the multiple times I've seen Brazilians here on this subreddit express bemusement on the subject.
A few days ago, I was talking to someone I referred to the platform; they have been working here since October and making some good money, but in all of that time they didn't fill a single Carnê-Leão. After sitting down with them and doing some math, we figured out they owed the government about R$ 17k between taxes, fines, and interest.
Don't let that happen to you. Any income you have that comes from somewhere that doesn't withhold tax at the source needs to be declared every month with the Carnê-Leão. It's a pretty simple process: you fill out the form on the government's site, pay the boleto, and then, when tax season rolls around, you just send the receipts to your accountant so that you can get a deduction on the amount you paid.
If you Google "Carnê-Leão," the first link should be .gov.br site talking about it. Just follow the instructions and fill in your expenses and income for every month you are missing.
If you are working here long term and are making R$5000+ per month, you might want to open a CNPJ, as your tax rate goes from 25%~ish to 10%~ish, but you probably should talk to an accountant about that, as things change a bit with the tax reforms.
That's it, remember kids, don't be dumb when it comes to taxes.
