Self-Employed, LLC, or Single-Member LLC in 2026: A No-Jargon Guide to Choosing Right
There is a moment, after the idea, before the first client, when every entrepreneur in Spain has to choose between three letters: AT (self-employed, worker), SL (limited liability company), or SLU (single-member limited liability company). The choice seems administrative. It is not: it conditions personal liability for years, the monthly cost of making a living from the business, the speed at which you can start invoicing, and the image you give to clients and banks.
This guide explains all three options in 2026 without hiding in jargon. With real figures, examples of three billing levels, the actual timelines of the process, and the nuances that a good accountant knows but sometimes doesn't mention because it benefits them for you to go where it's most profitable for them.
The essentials in one table
| Aspect | Self-Employed | LLC | Single-Member LLC |
|---|---|---|---|
| Minimum capital | 0 € | 3,000 € | 3,000 € |
| Personal liability | Unlimited with personal assets | Limited to capital contribution | Limited to capital contribution* |
| Notary proceedings required | No | Yes (incorporation deed) | Yes (incorporation deed) |
| Actual time to register | 24–48 hours | 7–15 days if all goes well | 7–15 days |
| Registration cost | 0 € in fees | 350–500 € (notary + Commercial Registry) | 350–500 € |
| Monthly accountant cost | 50–120 €/month | 150–300 €/month | 130–250 €/month |
| Minimum Social Security contribution (RETA, 2026) | 230 €/month (Flat Rate: 87 €) | 230 €/month for administrator (Flat Rate applicable) | 230 €/month for member-administrator |
| VAT | Quarterly (model 303) | Quarterly | Quarterly |
| Main tax | Income Tax (19–47% depending on bracket) | Corporate Income Tax 25% (micro-enterprises 23%) | Same as LLC |
| Profit distribution | Not applicable (personal income) | Dividends with withholding 19% (up to 6,000 €), 21% (6,000–50,000 €), 23% (50,000–200,000 €), 27% (200,000–300,000 €), 28% (>300,000 €) | Same as LLC |
| Accounts in Commercial Registry | Only if registered as Individual Entrepreneur | Yes, mandatory annual deposit (fine if omitted) | Yes, mandatory annual deposit |
| Minimum number of members | 1 | 1 (then technically it's an SLU) or more | 1 (by definition) |
*The SLU maintains limited liability provided that single-member status is declared in the Commercial Registry. If not done, the sole member responds personally.
Sources: Royal Legislative Decree 1/2010 (Capital Companies Act), Law 31/2014 (corporate governance), Law 11/2021 anti-fraud, Ministerial Order PCM/24/2024 (RETA contribution by net income), Corporate Income Tax Manual AEAT 2026.
Up to this point the data. Now the important part: how to decide.
The most common misunderstanding: "self-employed" is not a legal form
A limited liability company is a legal entity with its own legal personality. A self-employed person is not a legal form: they are a Social Security regime (RETA) to which individuals carrying out direct economic activity are registered.
This distinction changes everything:
- As self-employed, you are the business. There is no separation between your personal assets and those of the activity. If you sign a contract as self-employed, you sign it.
- As LLC/Single-Member LLC, the company is the business. You are its administrator or member. The company signs contracts. Your personal liability stays out except in exceptional cases.
The exceptional cases where an LLC member or administrator responds with personal assets in 2026:
- Personal guarantee to bank (most loans require it)
- Administrator liability for damages caused with intent or gross negligence (art. 236 LSC)
- Failure to file for bankruptcy on time (art. 367 LSC: 2 months from knowledge of dissolution grounds)
- Tax and Social Security debts not paid by the company (subsidiary liability of administrator, art. 43.1.b LGT)
- Omission of single-member status declaration in Single-Member LLC
Beyond these cases, the LLC is a real shield. Not magical, but real.
Case Study 1: Billing €25,000 — Self-employed wins
Ana, digital marketing consultant. Expected first-year invoicing: €25,000 gross. Deductible expenses (computer, training, advisor, subscriptions, part of rent): €4,000. Net income: €21,000.
If self-employed with Flat Rate
| Concept | Amount |
|---|---|
| RETA 12 months (Flat Rate 87 €) | 1,044 € |
| Income Tax (brackets: 19% up to 12,450 €, 24% up to 20,200 €, 30% up to 35,200 €) on 21,000 € | ≈ 3,700 € |
| Accountant | 50 €/month × 12 = 600 € |
| Total year 1 burden | ≈ 5,344 € |
| Net available | ≈ 15,656 € |
If incorporated as LLC
| Concept | Amount |
|---|---|
| Incorporation (notary + Registry) | 500 € |
| RETA contribution for administrator 12 months (Flat Rate 87 €) | 1,044 € |
| LLC accountant | 150 €/month × 12 = 1,800 € |
| Administrator salary self-assigned (€12,000 gross) → Income Tax | ≈ 1,200 € |
| Corporate Income Tax on business profit (21,000 − 12,000 = 9,000 €) × 23% micro-enterprise | ≈ 2,070 € |
| If dividends distributed (8,930 € remaining after CIT), withholding 19% | ≈ 1,696 € |
| Total year 1 burden | ≈ 8,310 € |
| Net available | ≈ 12,690 € |
Difference: €2,966 more expensive in LLC in year 1, even though liability is lower. For €25,000 billing with a low-risk activity (online consulting), self-employed wins economically.
Case Study 2: Billing €80,000 — LLC starts to make sense
Carlos, digital agency. Expected year 2 invoicing: €80,000. Expenses: €20,000. Net income: €60,000.
As self-employed (second year, without Flat Rate)
| Concept | Amount |
|---|---|
| RETA contribution (60,000 €/12 = 5,000 €/month net → max base 4,720 €) | ≈ 1,446 € × 12 = 17,352 € |
| Income Tax on 60,000 € (brackets 19 / 24 / 30 / 37%) | ≈ 14,850 € |
| Accountant 50 €/month × 12 | 600 € |
| Total burden | ≈ 32,802 € |
| Net available | ≈ 27,198 € |
As LLC (without full distribution, keeping part as reserves)
| Concept | Amount |
|---|---|
| RETA administrator contribution (same base if similar expected personal income) | ≈ 17,352 € |
| Administrator salary 40,000 € gross → Income Tax | ≈ 6,850 € |
| Corporate Income Tax on profit (60,000 − 40,000 = 20,000) × 23% | 4,600 € |
| Dividends of 10,000 € distributed to member: withholding 19% | 1,900 € |
| 5,400 € remaining as company reserve (no immediate additional tax) | 0 € |
| LLC accountant 200 €/month × 12 | 2,400 € |
| Total direct burden | ≈ 33,102 € |
| Net member (salary + dividends) | ≈ 41,250 € |
| Company reserve | 5,400 € |
At €60,000 income, the LLC already equals or surpasses self-employed if part of profit is reinvested. And personal assets are protected against potential litigation with a client or supplier non-payment.
Case Study 3: Billing €200,000 — LLC wins clearly
María, software developer for banking. Expected year 3 invoicing: €200,000. Expenses: €50,000. Net income: €150,000.
As self-employed
| Concept | Amount |
|---|---|
| RETA maximum bracket contribution | 17,352 € |
| Marginal Income Tax on 150,000 € (reaches 45% bracket) | ≈ 49,000 € |
| Accountant | 720 € |
| Total burden | ≈ 67,072 € |
| Net | ≈ 82,928 € |
As LLC with reasonable salary + reinvestment
| Concept | Amount |
|---|---|
| RETA administrator contribution (maximum base) | 17,352 € |
| Salary 60,000 € gross → Income Tax (≈ 24%) | 14,400 € |
| CIT on 90,000 € profit (micro-enterprise 23%) | 20,700 € |
| Company reserve: 69,300 € retained | 0 € |
| LLC accountant | 2,400 € |
| Total direct burden | ≈ 54,852 € |
| Net member (gross salary − Income Tax − RETA) | ≈ 28,248 € |
| Capital accumulated in company | 69,300 € |
At this level, the LLC wins decisively if the goal is not to live off the €200,000 gross every year, but to reinvest part of profit in growing the company or accumulate reserves for future investments.
The three most expensive mistakes in 2026
Mistake 1: Creating LLC "for image" with low billing
Someone who incorporates an LLC with only €8,000 expected annual billing ends up paying more in accounting (€1,800) than half their actual profit. The accountant doesn't dare recommend dissolution (it's lost work for him), and the entrepreneur keeps paying without understanding why.
Rule: if expected billing in 24 months is below €50,000, start self-employed. Dissolving an inactive LLC costs €1,000–2,000.
Mistake 2: Staying self-employed when risk is high
An electrician self-employed who installs an electrical panel in a commercial space responds with his house and car if one day there's a short circuit that causes damage. Professional liability insurance premiums drop by 20–40% when operating as LLC — because the insurer identifies lower default risk.
Rule: if your activity can cause third-party damage (construction, healthcare, installations, transport, food, legal or tax advisory), seriously consider LLC from day one.
Mistake 3: Underestimating the cost of managing an LLC
An LLC is not just the monthly accountant cost. There are additional obligations:
- Annual accounts in Commercial Registry: €100–150/year
- Legalized official books: €30–50/year
- General meeting and minutes (even single-member): member's time
- Economic Activities Tax if turnover exceeds 1M €: €200–500/year depending on municipality
- Mandatory audit if exceeding two of: €2,850,000 assets, €5,700,000 turnover, 50 employees → €2,500–6,000/year
For a small LLC, annual administrative fixed cost revolves around €3,500–5,000. This needs to be in the viability plan from the start.
The Single-Member LLC: when one alone is the best company
The Single-Member LLC was designed for entrepreneurs who want LLC protection but have no partners. It is legally an LLC with one member, with three particularities:
- Single-member status declaration mandatory in the Commercial Registry. If omitted, the sole member responds personally for company debts (art. 14 LSC).
- All contracts between member and company must be in writing and recorded in a Register of Contracts of the Sole Member (art. 16 LSC). It's a simple but mandatory formality.
- If the Single-Member LLC becomes multi-member (a new member enters) or reverts to single-member, must be declared again in the Commercial Registry.
Outside these three points, a Single-Member LLC works exactly like an LLC. Fiscally identical, same minimum capital, same limited liability. It's the natural form for solo entrepreneurship with limited company protection.
When it's none of these three?
There are specific situations where other forms work better:
- General Partnerships (CB) for two or more people sharing an activity without wanting to incorporate: simple, no capital, but joint and several unlimited liability.
- Professional Civil Partnership for members of regulated professions (lawyers, architects, etc.): allows joint activity without LLC burden.
- Worker Cooperative for collaborative projects: 3 members minimum, tax-advantaged (special cooperative regime), but complex governance.
- Corporation (SA) for projects with very high capital (€60,000 minimum) seeking investors or future listing.
For most new businesses in 2026, however, the real decision is between the three options in this guide.
How BoostPro AI helps decide
Choosing a legal form is the most structural decision of your business's first year. Changing it later costs between €1,500 and €5,000 in procedures and fees, not counting wasted time. The "Legal Status" module of BoostPro AI crosses eight variables (expected billing, sector, number of members, autonomous community, entrepreneur profile, investment plan, personal assets, end client profile) with actual 2026 tax law and returns an argued recommendation in PDF, with comparative simulation of all three regimes over three years. It's the best time investment (15 minutes of questionnaire) before seeing an accountant.
And if what you also need is to identify which aids for starting a business in 2026 you can combine with your chosen legal form, the simulator crosses the 33 registered Spanish programs with your profile and returns only the compatible ones, with estimated amount.