Abertura de Atividade
Opening Activity
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The process of registering as a self-employed worker (trabalhador independente) with the Portuguese tax authority, officially starting your freelance activity.
Abertura de atividade (literally "opening of activity") is the step that officially registers you as a trabalhador independente (independent worker) with the Portuguese tax authority. Without it, you don't exist as a freelancer in Portugal's system.
What you're actually doing
When you open activity, you're telling the Finanças three things:
- What you do: by choosing a CAE code (Código de Atividade Económica) that matches your profession. A web developer, a translator, and a yoga teacher each have different codes. You can register multiple CAE codes if your work spans several areas.
- How you handle VAT: most new freelancers earning under the threshold choose the Article 53 exemption, meaning they don't charge or reclaim VAT.
- How you're taxed: the vast majority of solo entrepreneurs use the simplified regime (regime simplificado), where the tax authority applies a fixed coefficient to your revenue instead of requiring full bookkeeping.
Online or in person
The Portal das Finanças lets you open activity entirely online. You'll need your NIF and portal credentials. The form walks you through each choice, CAE, VAT regime, expected annual revenue, start date.
If you're new to Portugal or unsure about the options, visiting a Finanças office in person is a valid alternative. Bring your NIF, ID, and proof of address. The staff can guide you through the choices, and you walk out registered.
The Social Security clock starts here
Opening activity triggers a 12-month exemption from Social Security contributions. During this first year, you earn income but don't pay into the social security system. Once the exemption ends, you'll file a quarterly declaration reporting your earnings, and Social Security will calculate your monthly contributions from there.
Closing activity
If you stop freelancing, you close activity through the same portal. This tells the tax authority you're no longer operating and stops future obligations from accumulating. You can reopen later if you return to self-employment.
Frequently asked questions
What is an abertura de atividade?
It's the formal registration of your self-employed activity with the Portuguese tax authority (AT). Until you complete this step, you can't legally issue invoices or operate as a freelancer in Portugal. Think of it as 'switching on' your freelance status.
Where do I open activity in Portugal?
You can do it online through the Portal das Finanças or in person at a Finanças office. The online process is faster if you already have portal credentials, but many expats find an in-person visit easier for the first time, staff can help you choose the right options.
What do I need to choose when opening activity?
You'll select your CAE code (the economic activity that best describes your work), your VAT regime (exempt under Article 53 or standard VAT), and your tax regime (simplified or organized accounting). Most solo entrepreneurs start with the simplified regime and Article 53 VAT exemption.
Can I open activity retroactively?
Yes, within limits. If you started working before registering, you can backdate the opening. However, you'll owe any applicable taxes from the actual start date, so it's best not to delay. The tax authority may also apply penalties for late registration.
What happens after I open activity?
Your 12-month Social Security exemption period begins. During this time you don't pay Social Security contributions. You can start issuing invoices immediately. You'll also need to keep track of your income for your quarterly declarations once the exemption ends.
Related terms
The English term for registering as self-employed in Portugal, the formal step that lets you issue invoices and triggers your Social Security exemption.
Portal das FinançasTax Authority PortalThe Portuguese tax authority's online portal where freelancers issue Recibos Verdes, file tax declarations, register invoice series, and manage their tax obligations.
Trabalhador IndependenteSelf-Employed WorkerThe Portuguese term for an independent worker or sole entrepreneur, the equivalent of a freelancer or sole trader in other countries.
Isenção do Artigo 53.ºArticle 53 VAT ExemptionThe VAT exemption under Article 53 of the Portuguese VAT code (CIVA) for small businesses and freelancers earning below the annual revenue threshold.
Segurança SocialSocial SecurityPortugal's social security system. Solo entrepreneurs contribute 21.4% of declared income to fund healthcare, sick leave, parental leave, and retirement pension.