Portuguese Tax and Business Terms Explained

Abertura de Atividade

Opening Activity

The process of registering as a self-employed worker (trabalhador independente) with the Portuguese tax authority, officially starting your freelance activity.

CAE

Classificação Portuguesa de Atividades Económicas · Economic Activity Code

The Portuguese economic activity classification code. Assigned when you open your business activity. Determines your tax category, applicable coefficients, and which obligations apply.

Cessação de Atividade

Closing Your Freelance Activity

The formal process of deregistering your self-employment activity with the Portuguese tax authority (AT). Closing activity has a 30-day deadline and triggers a final IRS declaration, a final Social Security reporting obligation, and (if you were VAT-registered) a VAT deregistration.

Chave Móvel Digital

Digital Mobile Key

Portugal's government digital authentication system. A username and password backed by a one-time code sent to your phone. Used to log in to Portal das Finanças, Segurança Social Direta, and other government portals.

Comprovativo de Início de Atividade

Proof of Activity Registration

The official document from the Portuguese tax authority confirming that a person or entity has registered as a self-employed worker. Downloadable in about 30 seconds from Portal das Finanças.

NIF

Número de Identificação Fiscal · Tax Number

Portugal's 9-digit tax identification number, required for every tax-related interaction from opening a bank account to issuing an invoice.

NIPC

Número de Identificação de Pessoa Coletiva · Company Tax Number

Portugal's 9-digit tax identification number for companies and legal entities, the corporate equivalent of a personal NIF.

Opening Activity

Abertura de Atividade

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 Finanças

Tax Authority Portal

The Portuguese tax authority's online portal where freelancers issue Recibos Verdes, file tax declarations, register invoice series, and manage their tax obligations.

Tax Authority Portal

Portal das Finanças

The English name for Portugal's Portal das Finanças, the online platform where freelancers issue invoices, file tax returns, and manage their relationship with the tax authority.

Trabalhador Independente

Self-Employed Worker

The Portuguese term for an independent worker or sole entrepreneur, the equivalent of a freelancer or sole trader in other countries.

Agregado Familiar

Household Composition

Your household composition for tax purposes: spouse, dependents, and filing status. Must be confirmed on the AT portal by February 15 each year.

Anexo B

Annex B: Self-Employment Income (Simplified Regime)

The IRS annex where solo entrepreneurs on the simplified regime declare their self-employment income (Category B). Contains your gross revenue, withholding tax, and activity codes.

Anexo H

The IRS annex for tax benefits and personal deductions: health expenses, education, housing, and e-fatura credits. Pre-filled from e-fatura data and AT records. Every filer with deductible personal expenses completes Anexo H.

Anexo J

Annex J: Foreign Income

The IRS annex for declaring income earned outside Portugal: employment, dividends, interest, rental income, or capital gains from other countries. Required for tax residents with any foreign income.

Article 53 VAT Exemption

Isenção do Artigo 53.º

The English term for the Portuguese VAT exemption that lets freelancers earning below the annual threshold operate without charging, filing, or deducting VAT.

Ato Isolado

Isolated Act

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.

Categoria B

Category B: Business and Professional Income

The IRS income category for self-employment income in Portugal. Covers freelancers, sole traders, and independent professionals. Declared in Anexo B of the Modelo 3 IRS return.

CIRS 1313

Analistas de Sistemas (CIRS Art. 151) · Systems Analysts (CIRS Art. 151)

The CIRS Art. 151 activity code for systems analysts working as individual freelancers in Portugal. Carries the 0.75 simplified-regime coefficient, identical to CIRS 1332 (programmers) and other listed professions.

CIRS 1519

Outros Prestadores de Serviços (CIRS Art. 151) · Other Service Providers (CIRS Art. 151)

The catch-all activity code in the CIRS Art. 151 table for individual freelancers providing services not covered by a more specific code. Carries the 0.35 simplified-regime coefficient, not the 0.75 that applies to most listed professions.

CIRS

Código do Imposto sobre o Rendimento das Pessoas Singulares · Personal Income Tax Code

The Portuguese tax code governing personal income tax (IRS). Maintained by AT (the tax authority). Includes Art. 151, which lists the professional activity codes that individual freelancers use to register their activity and determine their simplified-regime coefficient.

Coeficiente do Regime Simplificado

Simplified Regime Coefficient

The multiplier that determines how much of your gross income is taxable under the IRS simplified regime. For professional services it's 0.75, meaning 75% of gross is taxable and 25% is deemed business costs.

Declaração Recapitulativa

Recapitulative Statement

The quarterly VAT statement that VAT-registered businesses in Portugal must submit to the tax authority when they make intra-EU B2B sales of goods or services to VAT-registered customers in other EU member states. Values feed the EU's VIES database.

Deduções Específicas

Specific Deductions

IRS deductions applied to each income category before tax rates are calculated. For Category B (self-employment), the simplified regime's deemed cost coefficient acts as the specific deduction. For Category A employees, there's a fixed deduction of €4,462 or actual mandatory contributions if higher.

Despesas Dedutíveis

Deductible Business Expenses

Under Portugal's simplified tax regime (regime simplificado), freelancers do not deduct actual expenses. Instead, a fixed percentage of gross income is treated as assumed business costs. The catch: if documented business expenses fall below 15% of gross income, the taxable amount increases.

Double Taxation Agreement

Acordo para Evitar a Dupla Tributação · Double Taxation Agreement / Tax Treaty

A bilateral treaty between Portugal and another country that prevents the same income from being taxed twice. Defines which country has the right to tax each income type and how relief is applied.

e-Fatura

Electronic Invoice System

Portugal's electronic invoice system that automatically tracks purchases linked to your NIF. Used for tax deductions: if your NIF isn't on the receipt, the expense doesn't exist for tax purposes.

IRC

Imposto sobre o Rendimento das Pessoas Coletivas · Corporate Income Tax

Portugal's corporate income tax. Standard rate 19% (2026), with reduced rates for SMEs (15%) and startups (12.5%) on the first €50k. The IRC simplified regime offers effective rates as low as 1.5% on service revenue.

IRS Automático

Automatic IRS Return

A simplified pre-filled IRS return offered by AT for taxpayers with simple income situations. Available for employees (Cat. A) and pensioners (Cat. H) by default. Some Category B workers on the simplified regime can also qualify, but only for specific Art. 151 professions, with all invoices issued via the AT portal, and no foreign income or NHR/IFICI status.

IRS Jovem

Youth Income Tax Relief

A Portuguese tax benefit for workers under 35 that reduces IRS on employment and self-employment income for up to 10 years after the first year of income. Progressive exemption that starts high and decreases over time.

IRS

Imposto sobre o Rendimento das Pessoas Singulares · Personal Income Tax

Portugal's personal income tax: the annual tax that solo entrepreneurs pay on their individual income, declared each spring for the previous year's earnings.

Isenção do Artigo 53.º

Article 53 VAT Exemption

The VAT exemption under Article 53 of the Portuguese VAT code (CIVA) for small businesses and freelancers earning below the annual revenue threshold.

Isolated Act

Ato Isolado

The English name for Ato Isolado: a one-off invoice for occasional income in Portugal, issued without needing to register as self-employed.

IVA

VAT

Imposto sobre o Valor Acrescentado, Portugal's value-added tax, charged on most goods and services. The standard rate on the mainland is 23%.

Modelo 3

IRS Tax Return Form

The official Portuguese personal income tax return form. Filed annually between April and June for the previous year's income. Consists of a cover page (Rosto) plus annexes based on your income sources.

NHR Regime

Regime dos Residentes Não Habituais · Non-Habitual Resident Tax Regime

A Portuguese tax regime that offered qualifying new residents a flat 20% rate on professional income for 10 years. Replaced by IFICI (NHR 2.0) for applications from 2024 onward. Existing NHR holders keep their status.

Nota de Liquidação

Tax Assessment Notice

The official document AT sends after processing your IRS return. It shows the final tax calculation: what you owe or are owed, and the payment deadline. Issued around July 31 for declarations filed in April–June.

Personal Income Tax

IRS

The English name for IRS (Imposto sobre o Rendimento das Pessoas Singulares): the annual tax on individual income in Portugal, including freelance and self-employment earnings.

Regime Simplificado

Regime Simplificado de Tributação · Simplified Tax Regime

Portugal's simplified tax regime for solo entrepreneurs and small businesses, where taxable income is calculated using fixed coefficients applied to gross revenue.

Retenção na Fonte

Withholding Tax

Income tax withheld at the source by Portuguese businesses when they pay a solo entrepreneur for services, the client keeps a percentage (23% standard since 2025) and sends it directly to the tax authority.

Reverse Charge

Autoliquidação do IVA

A VAT mechanism where the buyer, not the seller, accounts for VAT. Standard for cross-border B2B services within the EU.

VAT

IVA

Value-Added Tax, a consumption tax on goods and services used across the EU. In Portugal it's called IVA and charged at 23% (standard rate) on the mainland.

Withholding Tax

Retenção na Fonte

A percentage of income tax that Portuguese businesses deduct from payments to freelancers and send directly to the tax authority, 23% standard since 2025 (reduced from 25% by OE2025).

ATCUD

Unique Document Code

AT Code Unique Document: the unique identifier required on every invoice and receipt in Portugal, combining a validation code from the tax authority with a sequential number.

Credit Note

Nota de Crédito

The English name for Nota de Crédito, a document that reverses or corrects a previously issued invoice when it can't be deleted or modified.

Fatura-Recibo

Invoice-Receipt

A combined invoice and receipt document issued by Portuguese solo entrepreneurs when payment is received, the document type behind the Recibo Verde system.

Fatura

Invoice

A formal invoice issued through certified software or the AT portal. For solo entrepreneurs on the simplified regime, income tax and Social Security remain cash-basis (tied to payment) regardless of when the invoice is issued.

Green Receipt

Recibo Verde

The English name for Recibo Verde, a combined invoice-receipt that solo entrepreneurs in Portugal issue through the tax portal when they receive payment.

Invoice-Receipt

Fatura-Recibo

The English term for fatura-recibo: a combined invoice and payment confirmation used by Portuguese freelancers, issued only when payment has been received.

Nota de Crédito

Credit Note

A certified fiscal document that corrects or partially reverses a previously issued invoice. Required in Portugal because invoices cannot be edited or deleted once issued.

Proforma Invoice

Fatura Proforma

A commercial document that looks like an invoice but has no fiscal or legal meaning, essentially a detailed quote that doesn't create any tax obligation.

Recibo Verde

Green Receipt

A combined invoice-receipt (fatura-recibo) issued by solo entrepreneurs in Portugal through the Portal das Finanças when they receive payment for services.

SAF-T

SAF-T (PT) · Standard Audit File for Tax

A standardized XML file containing all of a business's transaction data for a period. Certified invoicing software in Portugal generates SAF-T files for audit purposes. The Portuguese version is SAF-T (PT), based on the OECD standard.

Unique Document Code

ATCUD

The English term for ATCUD, the unique identifier on every Portuguese invoice that lets anyone verify the document's authenticity with the tax authority.

Anexo SS

Annex SS: Social Security

The IRS annex that reports your self-employment income to Social Security. Mandatory for all trabalhadores independentes filing IRS, even if exempt from contributions.

Declaração Trimestral

Quarterly Declaration

The quarterly income report that solo entrepreneurs file with Social Security (Segurança Social) to calculate their monthly contributions for the following quarter.

Quarterly Declaration

Declaração Trimestral

The English term for the quarterly income report filed with Portuguese Social Security, used to calculate freelancer contributions for the following quarter.

Segurança Social

Social Security

Portugal's social security system. Solo entrepreneurs contribute 21.4% of declared income to fund healthcare, sick leave, parental leave, and retirement pension.

Social Security

Segurança Social

Portugal's mandatory social contribution system for solo entrepreneurs. Covers healthcare, sick leave, parental leave, and pensions, funded by a 21.4% contribution on declared income.

Contabilista Certificado

Certified Accountant

A certified accountant registered with the Ordem dos Contabilistas Certificados (OCC). Required by law for companies and for sole proprietors on the normal regime, but not for the simplified regime.

IES

Informação Empresarial Simplificada · Simplified Business Information

An annual filing obligation for Portuguese companies (Lda, SA) combining accounting, tax, and statistical reporting into one electronic submission. Due by July 15 of the following year.

VIES

VAT Information Exchange System

The EU's free online tool for verifying VAT numbers. Confirms whether a business is VAT-registered and, in Portugal's case, reveals the name and address behind the number.