Form 30 (Modelo 30) is Portugal's monthly/annual return for withholding tax on payments to non-resident entities — royalties, interest, dividends, technical services, commissions, and others. The standard Portuguese rate is 25% (CIRS art.101 / CIRC art.94), but it can be reduced via Double Tax Conventions (DTC) — typically to 5–15% — provided the recipient submits Form RFI nº 21 (interest, dividends, royalties) or RFI nº 22 (professional and business income) before payment. The 5 most common mistakes generate fines of €450 to €22,500.

By Hugo Velez Ribeiro, Certified Accountant (OCC nº 64356) · 25+ years experience · HVR Business Consulting · 9 May 2026

What is Form 30 and who must file

Form 30 — Income Paid or Made Available to Non-Resident Taxpayers — is mandatory whenever a Portuguese entity (company, freelancer, institution) pays income to non-resident individuals or legal entities. Established in Decree-Law 42/91 and regulated by Decree 367/2020.

Required filers:

• Portuguese-based companies paying foreign suppliers (SaaS, consulting, royalties, licensed software)
• Freelancers paying non-resident collaborators
• Companies distributing dividends to foreign shareholders
• Companies paying interest on loans to foreign entities
• Companies paying commissions to overseas agents or representatives

Even if withholding is zero (via tax treaty or exemption), Form 30 must be filed.

2026 Filing Calendar

Form 30 is filed monthly, by the end of the second month following the payment (DL 42/91 art.4):

• Payment in January 2026 → file by March 31, 2026
• Payment in May 2026 → file by July 31, 2026
• Payment in December 2026 → file by February 28, 2027

No mandatory annual recap — each month is autonomous. But the Tax Authority cross-checks Form 30 with Form 22 (annual IRC), VAT returns and SAF-T, automatically detecting inconsistencies.

Standard 25% rate vs treaty reduction

Portugal's domestic withholding rate on income paid to non-residents is 25% (CIRS art.101 nº2 al.a + CIRC art.94 nº4). It applies by default when:

• No DTC exists between Portugal and the recipient's country, OR
• A DTC exists but the recipient hasn't filed Form RFI in time, OR
• The recipient is in a jurisdiction on the "more favourable tax regime" list (Decree 150/2004 — "tax havens"), in which case the rate is increased to 35%

When a DTC exists and a valid RFI is on file, the reduced treaty rate applies.

Reduced rates by country (HVR's main partners)

Portugal has more than 80 DTCs in force. For HVR clients' main cross-border destinations, the maximum treaty rates (always confirm with current DTC text):

• United States (DTC 1994): dividends 5%/15% (5% if ≥10% participation), interest 10%, royalties 10%
• United Kingdom (DTC 1968, updated): dividends 10%/15%, interest 10%, royalties 5%
• Spain (DTC 1993): dividends 10%/15%, interest 15%, royalties 5%
• France (DTC 1971): dividends 15%, interest 10%/12%, royalties 5%
• Germany (DTC 1980): dividends 15%, interest 10%/15%, royalties 10%
• Brazil (DTC 2000): dividends 10%/15%, interest 15%, royalties 15%
• South Korea (DTC 1996): dividends 10%/15%, interest 15%, royalties 10%
• Netherlands (DTC 1999): dividends 10%/15%, interest 10%, royalties 10%
• Ireland (DTC 1993): dividends 15%, interest 15%, royalties 10%
• Italy (DTC 1980): dividends 15%, interest 12%/15%, royalties 12%

Within the EU, the Parent-Subsidiary Directive (2011/96/EU) can fully exempt dividends from withholding when participation is ≥10% held for ≥1 year. The Interest-Royalty Directive (2003/49/EC) can also reduce intra-group interest and royalties to 0% within the EU.

How to apply the reduction — RFI 21 and RFI 22

Treaty rate reduction is not automatic. The non-resident recipient must submit the RFI form to the Portuguese paying entity before the payment:

RFI nº 21 — for interest, dividends, royalties and capital

Bilingual document (Portuguese + recipient country language). Identifies the recipient, type of income, country of tax residence, certified by the foreign tax authority. Validity: 4 years (renewable). Without it, the Portuguese entity withholds at the 25% domestic rate.

RFI nº 22 — for professional and business income

Applies to services, commissions, technical fees. Same structure as RFI 21 but for the income category covered by DTC articles 7 (business profits) and 14 (independent personal services).

RFI forms are available on the Portuguese Tax Portal in PT plus official bilingual versions in EN, ES, FR, DE. HVR helps clients obtain certification by the foreign tax authority (some countries require apostille; others accept a tax residence certificate).

5 mistakes that cost up to €22,500 in fines

Mistake 1: Forgetting Form 30 when treaty rate is zero

Most common error. The company correctly applies treaty reduction (e.g. 5% via DTC) but doesn't file Form 30, thinking "no withholding, no return". Wrong: Form 30 is mandatory for ALL payments to non-residents, even at zero rate. Fine: €200–5,000 per missed month (RGIT art.116).

Mistake 2: Applying reduced rate without valid RFI on hand

The Portuguese entity withholds at 5–15% trusting the recipient will "send the RFI later". Without a valid RFI on the payment date, AT may reclassify as missing withholding — difference up to 25% + compensatory interest + inaccuracy fine (RGIT art.119): €450–22,500.

Mistake 3: SaaS and licensed software — wrong income code

SaaS, software, and digital licence payments are often declared as "code 09 — services" when they should be "code 04 — royalties" (CIRS art.3 nº2 b). The distinction depends on whether the software is "customised" (service) or "standard licensed" (royalty). Misclassification triggers inspection and recalculation.

Mistake 4: Tax-haven payments without 35% aggravation

Payments to entities in jurisdictions on Decree 150/2004 (tax havens — Bermuda, Cayman, Monaco, etc.) are taxed at 35%, not 25% (CIRS art.101 nº10). Companies applying 25% by default are caught by Form 30 vs tax-haven list cross-check, facing the difference + interest + fine.

Mistake 5: Not cross-checking Form 30 with VAT reverse charge

Payments to EU B2B suppliers outside Portugal don't bear Portuguese VAT (reverse charge — CIVA art.6 nº6). But they may bear withholding tax on the service value. Companies that exempt VAT but forget Form 30 are caught by cross-checking the two declarations.

4 cross-border practical cases

Case 1: SaaS subscription to Delaware US company

Portuguese company pays $5,000/month to a US SaaS company. Portugal-US DTC: 10% on royalties. Recipient submits RFI 21 certified by IRS. Withholding: $500/month. Monthly Form 30 with code 04 (royalties), country US, RFI 21 referenced.

Case 2: UK freelancer contracting with Portuguese SME

UK freelance designer earns €4,000/project. Portugal-UK DTC applies 0% on business profits (art.7) — the freelancer's activity is taxed only in the UK. Recipient submits RFI 22. Withholding: €0. Monthly Form 30 with code 09 (services), country UK, RFI 22, rate 0%.

Case 3: Royalty to Korean entity (HVR's anonymised Case 1)

Portuguese company pays industrial royalty to South Korea. Portugal-Korea DTC: 10% on royalties. RFI 21 submitted before payment. Withholding: 10%. Monthly Form 30 code 04, country KR.

Case 4: Dividend to Brazilian shareholder

Portuguese company distributes €100,000 dividend to a Brazilian-resident shareholder (30% participation). Portugal-Brazil DTC: 10% on dividends if participation ≥25%. RFI 21 submitted. Withholding: €10,000. Form 30 code 02, country BR.

When to engage Cross-Border Advisory

For companies with: more than 5 non-resident suppliers/month, operations in non-EU jurisdictions (US, UK post-Brexit, Asian countries), structures with European holdings (Netherlands, Luxembourg, Ireland), royalties or IP licensing, dividend distribution to foreign shareholders, payments to offshore jurisdictions.

Tax risk is proportional to complexity. HVR Cross-Border Deal Advisory handles monthly Form 30 + cross-border tax structuring + RFI obtainment + offshore jurisdiction due diligence.

Frequently Asked Questions

What happens if I file Form 30 late?

Late filing fine: €200–5,000 (RGIT art.116). Can be reduced to 25% if voluntary filing is before any AT notification.

Can I apply the reduced rate without RFI at the time of payment?

No. AT requires a valid RFI on the payment date. Some companies withhold at 25% and apply for refund later — but the process is slow and bureaucratic. Best practice: request RFI before the first payment.

Is SaaS always a royalty?

It depends. Standard licensed SaaS (Salesforce, HubSpot, Microsoft 365) is typically a royalty (CIRS art.3 nº2 b). Customised SaaS may be a service (code 09). Case-by-case. When in doubt, consult a Certified Accountant.

Do I have to file Form 30 if the operation is exempt under the Parent-Subsidiary Directive?

Yes. The filing obligation is independent of effective withholding. Form 30 with 0% and indication of the applicable Directive.

What if I find an error in a previously filed Form 30?

Replacement filing via the Tax Portal. If voluntary (before inspection), it avoids the inaccuracy fine. Pay the withholding difference + compensatory interest.

How much does HVR charge for monthly Form 30?

For monthly accounting clients, it's included. For companies with cross-border volume (10+ payments/month), dedicated service from €250/month. Free 30-minute diagnostic →

Next steps

• Non-resident supplier inventory: list every payment to foreign entities in the last 12 months
• RFI audit: confirm every recipient has a valid RFI on file
• Filing calendar: monthly routine — submit Form 30 by the 28/30/31 of each 2nd month after payment
• Cross-check with VAT and Form 22: ensure consistency across the 3 declarations

For companies without a Form 30 process in place, HVR offers cross-border payment audit in 5 working days.