Since 1 January 2019 there has been a new reporting obligation for self-employed persons in Portugal. Indeed, a new mandatory quarterly declaration must be sent to the social security system in January, April, July and October, thus making it possible to calculate the amount of the contributions that the freelance must pay. The amount of social security taxes as a self-employed person in Portugal is now calculated each quarter according to the income obtaining over the previous 3 months. This social security declaration is made directly on the website Segurança Social Direita. How to complete your self-employed worker declaration in Portugal ? How to calculate social security contributions as a freelancer ? Lisbob, expats assistant in Portugal, tells you all about the quarterly income statement to the Portuguese Social Security.