Isolated Act
Ato Isolado
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The English name for Ato Isolado: a one-off invoice for occasional income in Portugal, issued without needing to register as self-employed.
If you're an expat in Portugal and someone mentions an "isolated act," they're translating Ato Isolado: a mechanism the Portuguese tax system provides for invoicing one-off income without registering as self-employed.
When you'd use one
Imagine you have a regular salaried job in Portugal, but a former client asks you to do a single consulting project. Or you sell a piece of furniture you built. Or you give a paid workshop at a conference. These are one-time events, not an ongoing business.
In many countries, you'd need to either register as self-employed or find some awkward workaround. Portugal offers a cleaner path: issue an Ato Isolado through the Portal das Financas, declare the income, and move on.
The one-per-year guideline
The critical rule is that the income must be genuinely occasional and non-recurring. The general expectation is no more than one per year. If you find yourself issuing isolated acts repeatedly, or if the activity starts looking like a pattern, the tax authority will expect you to register as a trabalhador independente and issue Recibos Verdes going forward.
Think of it as a threshold test: one isolated act is fine; two raises questions; a pattern means you need to formalize.
The practical details
You don't need a business registration or an open activity, just a NIF and access to the Portal das Financas. VAT is exempt below 25,000 euros, which covers the vast majority of one-off transactions. The income goes on your annual IRS return as Category B, taxed under the same simplified regime coefficients as regular self-employment income.
Isolated act vs. self-employment
The distinction matters because registering as a trabalhador independente triggers ongoing obligations: quarterly Social Security contributions, regular invoicing through Recibos Verdes, and annual declarations. The isolated act avoids all of that for a single transaction.
For the full Portuguese-language entry with more detail on the process, see Ato Isolado.
Frequently asked questions
What is an isolated act in Portugal?
An isolated act (Ato Isolado) is a one-off invoice you can issue through the Portuguese tax portal for occasional, non-recurring income. It's designed for people who aren't registered as self-employed but need to legally invoice a single transaction, a freelance gig, a sale, or a one-time fee.
Can I use an isolated act instead of becoming a freelancer?
Only for truly one-off income. If you issue more than one per year or if the activity becomes regular, the tax authority expects you to register as a trabalhador independente (independent worker) and open formal activity. The isolated act is a convenience, not an alternative to self-employment registration.
Do I need a company or business registration to issue an isolated act?
No. You only need a Portuguese NIF (tax identification number). That's the point, the isolated act lets you invoice without opening activity or registering as self-employed. You issue it directly through the Portal das Financas.
Is VAT charged on an isolated act?
Only if the amount exceeds 25,000 euros. Below that threshold, the transaction is VAT-exempt. This keeps the process simple for small, occasional transactions.
How do I report isolated act income on my tax return?
Income from an isolated act is declared as Category B income on your annual IRS (personal income tax) return. The simplified regime coefficients apply, 75% of services income or 15% of goods income is taxable. The tax portal typically pre-fills this information from the invoice you issued.
Related terms
A one-off invoice issued through the Portal das Financas by someone who is not registered as self-employed. Used for occasional, non-recurring income in Portugal.
Trabalhador IndependenteSelf-Employed WorkerThe Portuguese term for an independent worker or sole entrepreneur, the equivalent of a freelancer or sole trader in other countries.
Recibo VerdeGreen ReceiptA combined invoice-receipt (fatura-recibo) issued by solo entrepreneurs in Portugal through the Portal das Finanças when they receive payment for services.
NIFNúmero de Identificação Fiscal · Tax NumberPortugal's 9-digit tax identification number, required for every tax-related interaction from opening a bank account to issuing an invoice.