Two Different Starting Points
Autónomo and Sociedad Limitada aren't really competing options for the same business — they tend to fit different stages and risk profiles. Registering as an autónomo means operating as a sole trader: there's no legal separation between you and the business, registration is quick, and monthly social security contributions are the main fixed cost. An SL creates a separate legal entity with limited liability, but it comes with notary fees, ongoing accounting obligations, and corporate tax filings that a solo freelancer doesn't need to deal with.
The honest answer to "which one should I pick" is almost always "it depends on what the business actually looks like" — not a general preference for one structure over the other.
The comparison table looks tidy, but the real decision usually comes down to one question: are you billing one or two overseas clients, or building something you might sell one day? That answer changes the math faster than any tax-rate spreadsheet.
Side-by-Side Comparison
| Factor | Autónomo | Sociedad Limitada (SL) |
|---|---|---|
| Liability | Unlimited — personal assets exposed to business debts | Limited to capital contributed, in most circumstances |
| Setup cost | Minimal — mainly registration and no notary required | Roughly €2,500–€4,000 in notary, registry, and advisor fees |
| Setup timeline | Days | 2–4 weeks typically |
| Minimum capital | None | €1 legal minimum; €3,000 commonly recommended |
| Social security contributions | Monthly flat-rate or tiered contributions regardless of profit | Administrator/director social security contributions, plus payroll if staff are hired |
| Tax treatment | Personal income tax (IRPF), progressive rates | Corporate tax — standard rate, or 15% reduced rate for 4 years if ENISA-certified |
| Ongoing compliance | Quarterly IRPF and VAT filings | Quarterly filings plus annual accounts filed with the Commercial Registry |
| Credibility with banks/clients | Adequate for freelance/consulting work | Generally expected for hiring, investment, or larger commercial contracts |
When Autónomo Makes Sense
If you're a solo consultant, freelance developer, designer, or coach with modest revenue and limited liability exposure, autónomo status is usually the more practical starting point. It's faster to set up, cheaper to run month to month, and doesn't require the accounting overhead an SL demands. Many founders start as autónomo and convert to an SL later once the business justifies the added structure — there's no rule that says you have to pick correctly on day one.
The running cost makes the case concrete. Registering as autónomo is essentially free, and your RETA social security contribution starts around €80–90/month under the tarifa plana for your first twelve months (extendable to 24 in many cases), only stepping up to income-based brackets of roughly €200–600+/month after that. Add a gestoría for quarterly IRPF and VAT filings — commonly €90–220/month depending on invoice volume — and most solo freelancers are fully compliant for roughly €170–310/month in year one, a fraction of an SL's incorporation cost and ongoing bookkeeping.
I'd rather see a founder start as autónomo and convert to an SL once revenue justifies it than pay for a structure they don't need yet. Converting later is routine paperwork, not a do-over. Registro Mercantil Central → (opens in new tab)
When the SL Is Worth the Overhead
Once you're hiring employees, signing commercial contracts with real liability exposure, taking on investors, or planning to apply for something like ENISA certification and the associated Startup Visa benefits, the SL structure becomes the more sensible choice. Banks, landlords, and business partners generally expect an incorporated entity once the stakes rise, and the liability protection alone can justify the extra setup cost if the business carries real risk.
The tax math matters as much as the liability story. Autónomo profit is taxed at progressive IRPF rates that pass 30% around the mid-€20,000s and reach 37–45% at higher bands, while an SL pays corporate tax at a flat standard rate of 25% — or 15% for newly created companies in their first two profitable years. That's why many advisors put the practical crossover somewhere around €40,000–60,000 of annual net profit: below that range, the SL's overhead usually eats the savings; above it, the flat rate increasingly works in your favor, especially if you can leave part of the profit in the company rather than paying it all out as salary.
And the overhead is concrete: incorporation typically costs €2,500–4,000 all-in and takes a few weeks, share capital is €1 by law but €3,000 in practice (below that, 20% of profits must go into a legal reserve and shareholders keep liability for the shortfall), and ongoing compliance is heavier — full double-entry bookkeeping, annual accounts filed at the Registro Mercantil, and corporate tax returns, versus the lighter quarterly cycle most autónomos run with a gestoría. Details on the process and costs are in our company registration service page and the step-by-step SL registration guide.