Sole Proprietorship vs SARL in Luxembourg: Which to Pick?
Should you start as a sole proprietorship (entreprise individuelle) or form a SARL (or SARL-S) in Luxembourg? The short answer: sole proprietorship is cheaper and simpler; a SARL protects your personal assets and can be more tax-efficient at higher profit levels. Here's how to decide.
Criterion | Sole proprietorship | SARL-S | SARL |
|---|---|---|---|
Setup cost | ~€50 | ~€200–€500 | ~€1,500–€3,000 |
Min. capital | None | €1 | €12,000 |
Notary | No | No | Yes |
Personal liability | Unlimited | Limited (gérants personally liable for tax/CCSS) | Limited (same caveat) |
Tax on profits | Personal income tax (42% marginal, ~45.78% effective at the top) | Corporate (IRC + ICC + IF, ~22% below €175k, ~24% above €200k) | Corporate (same) |
Credibility | Lower | Medium | Higher |
Accounting complexity | Simple cash-basis below €100k; double-entry above | Double-entry | Double-entry |
RCS / RBE | RCS if commercial; no RBE | Both mandatory | Both mandatory |
When sole proprietorship wins
You're starting out and want to test your idea
Setting up a sole proprietorship takes days and costs almost nothing. You can start invoicing quickly, see if clients come, and exit if it doesn't work — without having to dissolve a company.
Your profit is modest
Below roughly €80,000–€100,000 annual profit, personal income tax is often as efficient as — or more efficient than — corporate tax, because:
- Corporate tax (IRC + ICC + IF) has fixed components that hurt at low profit levels
- Personal income tax starts much lower and only climbs progressively
- If you pay yourself a salary from a SARL, you're taxed as an employee on top of the corporate tax — double-taxation potential if not well planned
Your activity has low financial risk
If you're a solo freelancer doing intellectual work (writing, translation, consulting without big contracts), the risk of a catastrophic lawsuit or debt is low. Limited liability doesn't buy you much.
You hate paperwork
A sole proprietorship files one annual tax return (your personal return) and — below €100k turnover — keeps a simple ledger. A SARL files corporate tax returns, annual accounts, an RBE update, and has stricter timeline requirements.
When a SARL (or SARL-S) wins
Your business has real financial risk
Inventory, construction, large installations, work on client premises, products that could harm someone, contracts that could turn into lawsuits — in all these cases, limited liability shields your personal home, savings, and car. Even if the gérant can be personally liable for tax/CCSS debts, ordinary business risks are contained within the company.
Your profit is consistently high
Above roughly €100,000–€150,000 annual profit, the corporate tax route often becomes more efficient. After the 2024 tax reform, the company pays 14% IRC on profits below €175,000 and 16% IRC above €200,000 (plus 7% solidarity surtax and ICC). The combined Luxembourg City rate is roughly 22% below €175k and 24% above €200k. You pay yourself a salary and dividends, which can be structured tax-efficiently with a good adviser.
You want credibility
Large corporate clients and banks often prefer to contract with a SARL. Some public tenders exclude sole proprietorship. If you plan to pitch big accounts, a SARL opens doors.
You plan to bring in partners
A sole proprietorship has one owner by definition. Bringing in a partner means switching to a company. Starting as a SARL-S or SARL from day one saves that transition.
You want to sell the business later
You can sell a company's shares. You cannot sell a sole proprietorship as an entity — only its assets (equipment, client list, trade name). Company form makes exit cleaner.
SARL-S as a middle ground
If you want limited liability without the €12k classic-SARL price tag, SARL-S is often the sweet spot for small businesses:
- Capital from €1 — no heavy cash lockup at incorporation
- No notary — saves ~€1,000 on setup
- Same liability shield as classic SARL
- Same corporate tax treatment — IRC + ICC + IF
- Catch: only natural persons, only one per person, and only for business-permit activities (not liberal professions)
SARL-S is very popular with craftsmen, retailers, and first-time entrepreneurs who already need a business permit for their activity.
See our deeper guide on SARL-S in Luxembourg.
Quick decision table
Your situation | Likely best form |
|---|---|
Solo freelancer, low risk, profits under €80k | Sole proprietorship |
Small retailer or craftsman, wants liability shield | SARL-S |
Established business with profits consistently above €100k | SARL |
Bringing in corporate investors | SARL (not SARL-S) |
Liberal profession (lawyer, doctor, IT consultant without commercial permit) | Sole proprietorship or classic SARL (not SARL-S) |
Larger business, planning to raise equity | SA |
Can I switch later?
Yes. Many businesses start as sole proprietorship, then switch to a SARL-S or SARL once revenues stabilise. Switching means:
- Incorporating the new company
- Transferring clients, contracts, and equipment from the sole proprietorship to the company
- Closing the sole proprietorship registration
- Handling the legal and tax implications on the transfer (consider capital gains on assets)
It's not free, but it's not a one-way door. A tax adviser can help you time the switch — often when profits reach the level where corporate tax starts to win, or when liability becomes a real concern.
Quick reference
Question | Answer |
|---|---|
Cheapest form to start? | Sole proprietorship |
Cheapest company form? | SARL-S |
Best liability protection? | SARL-S, SARL, SA (all three limit shareholder liability) |
Most tax-efficient at low profit? | Sole proprietorship |
Most tax-efficient at high profit? | SARL / SARL-S |
Can liberal professions use SARL-S? | No — use sole proprietorship or classic SARL |
Can I switch from sole prop to SARL later? | Yes |
Related articles
- Legal forms for your business in Luxembourg
- Sole proprietorship in Luxembourg — pros and cons
- SARL-S in Luxembourg — the simplified SARL explained
- The 4 criteria for a business permit
- Taxes for self-employed in Luxembourg
Doing it your way takes guts. Bravo — we're rooting for you every step of the way.
🙌💜 Your BravoLisa Team
This article is for general information purposes only and does not constitute professional tax, legal, or accounting advice. Every situation is different — consult a qualified professional (tax adviser, accountant, or lawyer) for advice specific to your circumstances. BravoLisa does not accept liability for decisions made based on this information.
Last updated: April 2026. Rates and thresholds may change — always verify with the relevant authorities for the most current figures.
Updated on: 17/04/2026
Thank you!