Self-employed workers are required to submit their income declaration for January–March by April 30 via the Segurança Social portal. According to Instituto Nacional de Estatística data cited by Observador, there were around 773,000 such workers in 2025. The process is fully online and does not require in-person visits; users simply log into their account and select the relevant section. After submission, the system calculates the contribution base and a preliminary payment amount for the next quarter, while final monthly contributions may vary, for example due to sick leave. Users can track current and overdue payments and generate payment documents. Late submission may affect future contribution calculations. Material taken from https://t.me/s/lepta