SAFE Notes in Europe: Key Legal Differences from US SAFEs (2026)

You are raising pre-seed or seed capital for a European startup, and an investor asks to use a "standard YC SAFE." It sounds straightforward: a five-page document, no interest rate, no maturity date, and fast execution. Then your legal counsel or tax advisor flags that signing a pure Delaware-style SAFE under European civil law could trigger immediate taxable income, require a notary, or fail to convert under local corporate statutes.

This guide breaks down why US SAFEs break in European jurisdictions, which national instrument to use across the major startup hubs, and the specific terms you must check before accepting seed investment.

Why US SAFEs Break Under European Law

The Y Combinator Simple Agreement for Future Equity was created in 2013 for Delaware C-Corps. It relies on specific legal assumptions that do not exist across European civil and common law systems:

The Four European Standard Instruments

Instead of trying to force an unmodified US template into European corporate entities, founders use established national equivalents designed for local tax and corporate codes:

1. United Kingdom: Advance Subscription Agreement (ASA)

In the UK, the closest equivalent to a SAFE is the Advance Subscription Agreement (ASA). Key mechanics:

• Pure Equity Nature: An ASA is an agreement to prepay for shares that will be issued at a future date (usually the next qualifying funding round). Under UK law, it cannot be repaid or bear interest.
• SEIS / EIS Tax Qualification: To qualify for the UK's Seed Enterprise Investment Scheme (SEIS) or Enterprise Investment Scheme (EIS), HMRC requires strict compliance: the longstop date cannot exceed 6 months from payment, the funds cannot be refunded, and the agreement cannot carry debt features.
• Longstop Date: If no round occurs before the longstop date (typically 6 months), the ASA must convert automatically at a pre-agreed floor price.

2. France: BSA-AIR

In France, the Bons de Souscription d'Actions d'Accord d'Investissement Rapide (BSA-AIR) is the market standard for Sociétés par Actions Simplifiées (SAS):

• Legal Basis: Created under the French Commercial Code (*Code de commerce* Article L. 228-91 et seq.) as a share subscription warrant.
• Mechanics: Investors purchase warrants that give the right to subscribe for shares during a future financing round or upon reaching an agreed deadline.
• Valuation Cap & Discount: Functions similarly to a SAFE with a discount (typically 15–20%) and a valuation cap (*valorisation plafond*).
• Tax Stability: Because warrants have statutory recognition in France, BSA-AIR avoids the risk of tax reclassification that affects raw contractual SAFEs.

3. Germany: Convertible Loan Agreement (CLA / Wandeldarlehen)

In Germany, convertible loans are overwhelmingly preferred over pure SAFEs for a GmbH:

• Strict Capital Maintenance (Kapitalerhaltung): Under German GmbH law (GmbHG), share capital increases require notarial deeds (notarielle Beurkundung). A pure SAFE signed as a simple private agreement cannot legally bind the company to issue shares.
• Debt Structure: A CLA is structured as a loan with interest (often 4–8% non-cash, compounding) and a fixed maturity date (12–24 months), with an option/obligation to convert into equity at the next round.
• Notarial Step at Conversion: The formal notary involvement happens at the priced equity round when share capital is officially increased.

4. Portugal: Mútuo Convertível and Prestações Acessórias

In Portugal—the live Outlex market—early-stage funding requires alignment with the Portuguese Commercial Companies Code (Código das Sociedades Comerciais / CSC):

• Mútuo Convertível: Structured as a private loan agreement between the investor and the company (Lda. or S.A.) granting a conversion right into *quotas* or shares at the next equity round or maturity.
• Prestações Acessórias / Suprimentos: Existing shareholders frequently use shareholder loans (suprimentos) or ancillary capital contributions (prestações acessórias), which provide debt or quasi-equity structures recognized under Portuguese tax and corporate law.
• Execution Requirements: Decree-Law 76-A/2006 streamlined Portuguese corporate transactions by removing public deed requirements for quota transfers, but formal corporate minutes (deliberações sociais) and shareholder waiver of statutory preference rights remain essential to execute the conversion smoothly.

European Financing Instruments at a Glance

Five Terms Founders Must Audit Before Signing

1. Pre-Money vs. Post-Money Valuation Cap: Since 2018, the standard YC SAFE is post-money. This means investor ownership is locked, and all subsequent note dilution comes entirely out of the founders' equity. Always calculate the total dilution across all convertible notes before agreeing to a post-money cap.
2. Discount Percentage: Typical European market discounts range between 10% and 20%. Ensure the discount applies to the share price of the next round and does not compound unfairly with the valuation cap.
3. Maturity and Longstop Mechanics: What happens if you do not raise a qualifying round before the deadline? The agreement must clearly specify whether the instrument converts at a pre-agreed floor valuation, extends automatically, or triggers a repayment demand.
4. Qualifying Financing Threshold: Define the minimum round size (e.g. €500,000 or €1,000,000) that automatically triggers conversion. A small €25,000 angel ticket should not inadvertently force your notes to convert.
5. Most Favored Nation (MFN) Clause: If early investors demand an MFN clause, understand that any better terms granted to subsequent angel investors will automatically flow back to the earlier notes.

Reviewing Seed Financing Agreements

Seed financing documents carry lasting implications for founder ownership and future venture rounds. Outlex provides structured AI contract review to examine financing agreements, term sheets, and ancillary documents:

• Extract valuation caps, discount rates, maturity dates, and conversion definitions.
• Flag non-standard investor covenants, liquidation preferences, or restrictive transfer terms.
• Organise questions and negotiation points for your qualified legal counsel in Portugal or your local jurisdiction.