How large law firms structure their fees: hourly rates, fixed fees, retainers and success fees

The free negotiation of fees under article 26 of the Spanish General Statute of the Legal Profession coexists with growing client pressure for predictability. We review the dominant models, their advantages and their limits.

Asking a large firm how much it charges is asking the wrong question. The right answer starts with another question: under which model. The fee structure shapes the lawyer's incentive, the risk the client takes on and the predictability of the budget, and Spain's large firms have moved in a decade from billing almost everything by the hour to living with a catalogue of alternative formulas.

The starting point is freedom: article 26 of the General Statute of the Legal Profession, approved by Royal Decree 135/2021, leaves the amount of fees to free agreement between client and lawyer, with only two brakes: professional conduct rules and competition law. The Statute does not close the door to any formula: hourly rates, fixed fees, periodic retainers or result-linked fees are all compatible with that framework, and their legal soundness depends above all on documenting them clearly before work begins.

The hourly rate, still dominant

The classic model remains the reference: each professional has an hourly rate by category (partner, director, senior, junior) and the client pays for time spent. Rates move across very wide ranges depending on the firm, the practice area and the city.

Its advantage is flexibility for unpredictable matters; its drawback, uncertainty for the client and the perverse incentive of measuring value in time. That is why it increasingly coexists with capped budgets by phase and detailed time reports the client can audit.

Fixed fee and capped fee

The fixed fee shifts the overrun risk to the firm: the client knows from day one what it will pay for a defined scope. It is the model preferred by large companies' legal departments for recurring or perfectly delimitable work: due diligence, standard contracts, filings, monitored proceedings.

Its most common variant is the capped fee: work is billed by the hour but with an agreed ceiling. It balances flexibility and predictability, and forces the firm to run the project with budget discipline.

Retainer and subscription

The retainer turns the firm into the company's house counsel: a fixed periodic fee covers a volume of consultations or monthly hours, with improved rates for anything beyond it. For the client it buys availability and accumulated knowledge of its business; for the firm, recurring revenue and a relationship that goes beyond the one-off matter.

Success fee and hybrid models

In litigation, arbitration and transactions, a hybrid formula is common: a reduced base fee plus a variable linked to the outcome (a percentage of the saving achieved, of the award avoided or of the deal price). The key to these formulas is precision in the agreement: what counts as a result, how the variable is calculated and when it accrues, all in writing in the engagement letter.

What professional conduct requires in every case is ex ante transparency: the engagement letter, which article 27 of the Statute places before the start of the work and which we analyse in depth in our editorial on the engagement letter, is the place to set the model, the scope and the review criteria in writing before starting.

The bar association framework: guidance, not binding rates

Bar associations may approve guidance criteria for fees, but under article 29 of the Statute their role is limited to serving as a reference for cost assessments and the judicial review of lawyers' accounts, not as a mandatory tariff. We explain this in our piece on bar fee guidance and Law 2/1974. Inside the firm, the internal sharing of origination fees follows its own conduct rules, covered in our article on client-origination fee sharing.

When the client does not pay, the lawyer has collection channels we develop in our piece on late payment and fee collection: if the client is a business, Law 3/2004 also sets default interest for late payment in commercial transactions.

Where the market is heading

Pressure from legal departments for efficiency, the arrival of artificial intelligence in document work and competition from new alternative firms are pushing the sector towards value-based rather than time-based models. The hourly rate will not disappear, but it will increasingly coexist with hybrids: fixed fees by phase, subscriptions for SMEs and sophisticated success fees. The firm that can explain its model transparently will hold a real competitive advantage, as we keep reporting in our Large firms section.

Sources

1. Royal Decree 135/2021, of 2 March, approving the General Statute of the Spanish Legal Profession (consolidated text) (BOE). Checked 22 October 2026.
2. Law 2/1974, of 13 February, on Professional Associations (consolidated text) (BOE). Checked 22 October 2026.
3. Law 3/2004, of 29 December, on measures to combat late payment in commercial transactions (consolidated text) (BOE). Checked 22 October 2026.

The specific facts in this article come from the official sources cited.