Fixed-fee or hourly lawyer: which billing method should your startup choose?

Should you pay your lawyer a fixed fee or by time spent when launching or growing a startup? In France, no legislation imposes a single model. Everything rests on freedom of contract and a clear written fee agreement. For a company leader, the aim is twofold: control the budget and safeguard delivery. Here is a practical method for deciding quickly, without unpleasant surprises.

The legal framework in 2026: freedom of choice, mandatory written agreement

French law requires neither fixed fees nor hourly billing. However, the obligation to enter into a written fee agreement, specifying the billing method and arrangements, is established by the law governing the legal profession (art. 10 de la loi du 31 décembre 1971). You can consult the text on Legifrance and the practical information sheet on lawyers’ fees on Justice.fr.

The Règlement Intérieur National (RIN) of the Conseil National des Barreaux governs transparent and fair billing. In practice, the fee agreement must at least describe the assignment’s scope, the billing method (fixed fee, time-based, hybrid), anticipated expenses and disbursements, and arrangements for revision if unforeseen circumstances arise. Institutions restate this good practice (see CNB and Justice resources).

Fixed fees: budget predictability and delivery-based management

When to favour them

• Well-defined, standardised assignments: company formation, terms & conditions, NDAs, HR package, terms of sale/use, GDPR policies.
• Documents with a defined scope and clear deliverables (e.g. articles + simple shareholders’ agreement + minutes).
• A strong need for budget visibility (startup, seed, Series A) and tight cost governance.

Benefits:

• Predictability: a price known in advance and tied to deliverables.
• Internal clarity: easy to obtain board/investor approval.
• Alignment with perceived value and product/fundraising timetable.

Limitations and safeguards:

• Risk of out-of-scope work if the assignment evolves → provide for options (e.g. additional iterations, multi-party negotiation), a change process and an additional rate schedule.
• Unforeseen procedural developments or multiple deals → prefer a modular fixed fee by milestone.

For practical guidance on startup-package deliverables (articles/agreement), see our analysis of shareholders’ agreement costs, and plan the overall budget using the legal budget by maturity stage.

Time-based billing (hourly/daily rate): flexibility and traceability

When to prefer it

• Matters that are inherently unpredictable: litigation, pre-litigation, investigations, emergencies.
• Complex transactions with an evolving scope: multi-investor fundraising, carve-outs, competitive M&A.
• Needs for in-depth legal research, iterations and fast-track negotiations.

Benefits:

• Flexibility when the workload is difficult to predict.
• Detailed traceability through timesheets, useful for internal audit and management control.

Points to watch and controls:

• Lack of budget visibility → set a budget cap (fee cap), warning thresholds and weekly reporting (WIP).
• Different rates → require a rate schedule by seniority and the team composition.

For deals, consult our practical guidance on lawyer fees for a seed round to adjust your strategy (fixed fee for documentation + time-based negotiation).

Hybrid and alternative models suited to startups

• Fixed fee + options (iterations, negotiation sessions, closing across several milestones).
• Fixed fee + hourly cap (beyond a quota, rate-based billing capped by phase).
• Subscription (monthly retainer) for recurring operations: product/contract ops, GDPR compliance, routine corporate work.
• Success fee in addition to a fixed fee (never alone; a pure quota litis arrangement is prohibited in France); a reasonable and proportionate percentage, strictly governed by the agreement and professional ethics, under the law governing the profession (see Legifrance).

A firm equipped with tools and an AI‑first approach often offers these formats as clear packages. To understand how AI tools affect productivity and pricing, see why an AI-first firm makes sense for a tech startup.

How to choose in 15 minutes: the decision framework

1) Define the assignment

• Stable scope, known deliverables → Fixed fee (with options).
• Changing scope, uncertainties → Time-based billing (with cap/reporting) or hybrid.
• Recurring volume → Subscription + time-based workstreams.

2) Calibrate risk and budget

• High legal/financial risk → secure senior expertise, hybrid model with decision thresholds.
• Strict budget (seed, early stage) → milestone-based fixed fee + options held inactive until triggered.

3) Finalise the fee agreement

Essential clauses:

• Detailed scope (included/excluded) and pricing assumptions.
• Deliverables, milestones, indicative timetable and approval arrangements.
• Billing method (fixed/time-based/hybrid), additional rates, caps, options and the change process.
• Reporting (frequency, content), meeting arrangements (weekly check-in), and decision governance.
• Expenses and disbursements (who pays what and when), any penalties/discounts and payment arrangements.
• Confidentiality/professional secrecy, information security and tools used.
• Arrangements for disputes and mediation (competent Bâtonnier, see Justice.fr).

Need a structured method for finding and briefing counsel? Use our advice on choosing the right lawyer.

B2B electronic invoicing (2026–2027): what startups must anticipate

The general rollout of electronic invoicing and e-reporting begins on 1 September 2026 (receipt for all businesses), with issuance phased through 1 September 2027 according to company size. See reference information sheets on Service Public Pro, the CNB reminder “The CNB helps you prepare” and the Wolters Kluwer guide specifically for lawyers.

Key points for firms and startup clients:

• VAT liability: the reform concerns all taxable persons (including lawyers). Choose a platform (PPF/PDP) and configure flows.
• Professional secrecy: the CNB emphasises preserving secrecy (no transmission of data unrelated to the tax purpose) within e-invoicing flows (CNB).
• Penalties for non-compliance: fixed fines per missing invoice/transmission with annual caps, as professional guides explain: Office‑Avocat and Liberall Conseil.

Good practice for leaders: incorporate e-invoicing into purchasing/finance processes and contractually specify the invoice format, purchase-order references and deadlines in the fee agreement.

Three typical scenarios and recommendations

1) Incorporation package + standard commercial contracts

• Choice: milestone-based fixed fee (incorporation, terms of sale/use, NDA, privacy policy), pay-as-you-go iteration options.
• Useful clause: “X revision rounds included per deliverable, then €Y/hour beyond that, after written agreement.”

2) Seed round with co-investors

• Choice: hybrid (fixed fee for standard documentation + capped time-based negotiation), supplementary success bonus if closing occurs before the target date.
• To frame the overall fundraising budget, see our guidance on the cost of a seed round.

3) Pre-litigation with a strategic client

• Choice: time-based billing with a cap per phase (analysis, formal notice, negotiation), weekly reporting and a go/no-go decision before proceedings.
• Useful clause: “Exceeding the cap is subject to a signed change order.”

Common mistakes to avoid

• Negotiating a price without defining the scope and assumptions (a major source of disputes).
• Forgetting expenses and disbursements (registry, formalities, bailiff, translation).
• No progress reviews or budget alerts for time-based billing.
• Ignoring e‑invoicing 2026–2027 in finance processes (risk of fines and payment delays).

Further guidance on legal governance

Structure your roadmap and costs with our legal budget guide by stage and plan firm selection using our method for choosing a lawyer suited to startups. To assess how tools affect fees and quality, see why an AI-first firm creates value. Finally, for specific items, consult our dedicated explanations (e.g. shareholders’ agreement or fundraising).

Quick FAQ

Does the law require fixed fees or time-based billing?

No. The choice is free. However, a written fee agreement is mandatory and must specify the chosen method and arrangements (see Legifrance and Justice.fr).

Is a success fee alone possible?

No. A pure quota litis arrangement is prohibited. A success fee is permitted only as a supplement to a fixed fee, proportionately and within defined terms.

What are the risks without a clear agreement?

Scope disputes, unauthorised overruns, challenges before the Bâtonnier. Protect yourself with detailed scope, caps and reporting.

Does electronic invoicing apply to lawyers and startups?

Yes, to all VAT-taxable persons, on a 2026–2027 timetable. See Service Public Pro, CNB and Wolters Kluwer.

How do you challenge a lawyer’s invoice?

Apply to the Bâtonnier of the competent Bar (procedure explained on Justice.fr). This is why a precise agreement matters.