If your Portuguese company hires a freelancer, consultant, or supplier based abroad, you are not simply paying an invoice. Depending on the type of service and where the provider is resident, you may have to withhold corporate income tax (IRC), account for VAT under the reverse-charge mechanism, and check whether a double-taxation convention reduces or eliminates the tax due. Getting this wrong exposes your company to assessments, interest, and penalties from the Autoridade Tributária.
This guide explains the three layers every Portuguese buyer of cross-border services needs to understand: withholding tax, VAT, and tax treaties.
Withholding tax on payments to non-residents (IRC)
Under the Código do IRC (CIRC), income earned in Portugal by a non-resident entity without a permanent establishment is, in many cases, taxed by withholding at source. The Portuguese payer acts as substitute taxpayer and must retain the tax before paying the supplier.
Article 4 of the CIRC defines when income is considered obtained in Portugal. Certain categories — notably royalties, technical assistance, the use of equipment, and some commissions — are treated as Portuguese-source income even when the provider is abroad. The general domestic withholding rate for many of these payments is 25%, but rates vary by income type, so confirm the exact rate with a certified accountant.
Services that are usually outside withholding
Pure provision of services performed entirely abroad (for example, generic consulting with no transfer of know-how) is frequently not deemed Portuguese-source income and therefore not subject to withholding. The distinction between a taxable “technical assistance / know-how” payment and an ordinary service is a recurring source of disputes, so document the nature of each contract carefully.
VAT on imported services (CIVA)
VAT follows entirely different rules from IRC. Under the Código do IVA (CIVA) and the EU VAT Directive, the place of supply of services to a taxable person (B2B) is generally where the customer is established. So when your Portuguese company buys services from a provider abroad, the supply is typically located in Portugal.
The reverse-charge mechanism
In a B2B cross-border service, your company self-assesses Portuguese VAT through the reverse charge (autoliquidação). You declare the VAT as output tax and, if you have full deduction rights, deduct it as input tax in the same return — usually a cash-neutral entry. This applies to both EU and non-EU suppliers.
- For EU suppliers, the transaction is also reported in the VIES recapitulative statement and requires a valid EU VAT number on both sides.
- For non-EU suppliers, reverse charge still applies, but there is no VIES reporting.
- If your activity is VAT-exempt without deduction rights, the self-assessed VAT becomes a real cost.
Double-taxation conventions
Portugal has signed an extensive network of Conventions to Avoid Double Taxation (CDT/ADT), broadly based on the OECD Model. A treaty can reduce the domestic 25% withholding to a lower rate — or, for business profits without a permanent establishment, eliminate it entirely.
To benefit, the non-resident must usually prove residence and treaty eligibility before payment, using the official Modelo 21-RFI certified by their tax authority (or accompanied by a residence certificate). Without this documentation in hand at the moment of payment, you must apply the full domestic rate and the provider would have to reclaim the excess.
Practical takeaway: before paying any foreign supplier, classify the service (is it withholdable?), confirm the VAT treatment (reverse charge?), and collect the Modelo 21-RFI in advance if a treaty rate applies. The paperwork must exist at payment date, not afterwards.
How EasyFin helps
EasyFin gives expat founders and SMEs a clear view of cross-border supplier obligations — flagging which invoices may trigger withholding, automating reverse-charge entries, and keeping treaty documentation organised so nothing is missing at payment time. If you want a structured way to manage non-resident payments and stay compliant with the Autoridade Tributária, start with EasyFin here and let our team map your specific situation.
Conclusion
Hiring non-resident service providers is routine, but each payment can carry IRC withholding, VAT self-assessment, and treaty obligations at once. Treat classification and documentation as part of the procurement process, not an afterthought, and confirm rates with a certified accountant before you pay.
This article is for information only and does not constitute professional tax advice. Tax rules change and individual circumstances vary — always confirm your position with a certified accountant (contabilista certificado).