The hook
“A lot of people discover Carnê-Leão when annual filing season arrives, which is later than Receita intended.”
Receita Federal explains that resident individuals receiving certain income from another individual or from abroad can fall into the monthly Carnê-Leão system. The annual return still matters, but the monthly platform is where the tax is calculated and paid along the way. Treating it as an April-only issue usually means the process started too late.
The takeaway
If the income arrives month by month, Brazil may expect the tax workflow to do the same.