Every business in Portugal has a CAE code — and choosing the right one is one of the first real decisions you make when you incorporate or register as self-employed. It defines what your business officially does, and it feeds straight into your tax registration. This guide explains what CAE codes are, which version applies in 2026, the difference between principal and secondary codes, and the reassuring truth that Portugal has no generic business licence to buy.
What a CAE Code Is
CAE stands for Classificação Portuguesa das Atividades Económicas — the Portuguese classification of economic activities, maintained by the national statistics institute, INE. Each activity has a code, and every business declares the code(s) that match what it does.
The current version is CAE-Rev.4, introduced by Decreto-Lei n.º 9/2025 and in force since 1 January 2025. If you're reusing an older CAE-Rev.3 code from a template or an old registration, check that it still maps correctly — the revision changed some codes.
Principal and Secondary CAEs
A business declares:
- One principal CAE — its main activity, the thing it primarily does.
- One or more secondary CAEs — other activities it also carries on.
For example, a company whose main business is software development declares that as its principal CAE and might add a secondary CAE for related consulting. The CAE is recorded at incorporation and again in the início de atividade at Finanças, and it can be amended as the business grows.
You can see how CAE fits into the whole formation picture, dated and sourced, on our verified company-formation dataset.
The Início de Atividade: Registering With Finanças
Before your first VAT-liable operation, you must file the declaração de início de atividade (start-of-activity declaration) at Finanças. This declaration:
- Declares your CAE,
- Sets your tax regime, and
- Sets your IVA (VAT) status.
It can be filed online on the Portal das Finanças or in person at a Finanças desk or Loja do Cidadão. For a company, incorporation and the início de atividade are the two registrations that get you legally trading; our step-by-step company opening guide walks through the sequence.
The Good News: No Generic Business Licence
Here's the point that surprises newcomers from countries where you buy a "business licence" per activity: Portugal has no generic per-activity business licence. A company lawfully carries on an activity simply by registering the corresponding CAE code(s) and filing the início de atividade — not by purchasing a licence.
That makes starting most businesses genuinely simpler than people expect. There's no licence to renew for the ordinary run of consulting, software, e-commerce, trades or professional services — the CAE plus the tax registration is the mechanism.
When You Do Need a Permit: Regulated Activities
The exception is specific regulated activities, which need a permit beyond the CAE. Retail, services and restaurant establishments — a beauty or wellness studio, or a food and beverage venue, for instance — fall under the RJACSR (Decreto-Lei n.º 10/2015) and require a prior communication (mera comunicação prévia or comunicação prévia com prazo) through the Balcão do Empreendedor, plus sector health and hygiene rules. The exact instrument depends on the activity and the município.
So the rule of thumb is: CAE + início de atividade gets an ordinary business trading; regulated establishments need that plus a prior communication and any sector permits. If you're opening a physical premises serving the public, budget for the extra step.
Choosing the Right CAE: Why It Matters
The CAE isn't just administrative box-ticking — it interacts with real things:
- Tax and IVA treatment can depend on the activity you declare.
- Eligibility for incentives and certain regimes can hinge on your CAE (for example, some tax-benefit routes reference specific CAE codes).
- Regulatory obligations flow from whether your activity is regulated.
Picking a code that genuinely reflects your business — and adding secondary codes honestly — avoids problems later. If your real activity drifts from your declared CAE, update it.
Common Mistakes
- Using an outdated CAE-Rev.3 code. CAE-Rev.4 has applied since 1 January 2025 — use the current version.
- Assuming you need to buy a licence. For ordinary activities there's no generic business licence — the CAE plus início de atividade is enough.
- Forgetting the regulated-establishment step. A café, restaurant or beauty studio needs a prior communication under the RJACSR on top of its CAE.
- Declaring a CAE that doesn't match reality. Keep principal and secondary codes aligned with what you actually do.
Getting It Right From Day One
The CAE and início de atividade are quick to get wrong and quicker to get right with help — especially if your activity might be regulated, or if you want your tax regime and IVA status set up correctly the first time. It's the foundation everything else sits on.
Incorporating in Portugal and unsure which CAE and tax setup fit your business? Our company setup service handles incorporation, the correct CAE and the início de atividade end to end. If you're going solo, see how to register as a freelancer. All the rules are on the verified company-formation dataset.
Frequently Asked Questions
A CAE code (Classificação Portuguesa das Atividades Económicas) identifies the economic activity a business carries on. It is maintained by INE, and the current version, CAE-Rev.4, has been in force since 1 January 2025. A company declares its CAE at incorporation and in its início de atividade at Finanças.
Portugal has no generic per-activity business licence. A company lawfully carries on an activity by registering the correct CAE code(s) and filing the declaração de início de atividade at Finanças — not by buying a licence. Only specific regulated activities, such as food and beverage or beauty establishments, need a further permit (typically a prior communication via the Balcão do Empreendedor).
A company declares one principal CAE — its main activity — and may add one or more secondary CAEs for other activities it also carries on. The CAE is recorded at incorporation and in the início de atividade at Finanças, and it can be updated as the business evolves.
The declaração de início de atividade (start-of-activity declaration) is filed at Finanças before the first VAT-liable operation. It declares the company's CAE, tax regime and IVA status. It can be filed online on the Portal das Finanças or in person at a Finanças desk or Loja do Cidadão.
CAE-Rev.4, introduced by Decreto-Lei n.º 9/2025, has been in force since 1 January 2025 and is the version to use in 2026. If you are working from an older CAE-Rev.3 code, check that it maps correctly to CAE-Rev.4 before you register.