Articles on: Becoming Self-Employed

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)
Minimum annual tax (even at zero profit)	None	~€535/year (minimum NWT, balance sheet ≤ €350k)	~€535/year (same minimum NWT)
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 (notably the ~€535/year minimum NWT)
Personal income tax starts much lower and only climbs progressively
Salary paid out of a SARL is deductible at the company level (it reduces the corporate tax base), so a salary is taxed once at the personal level. Dividends are different: the profit is first taxed at corporate level (~22–24%), then 50% of the dividend is exempt at the shareholder level (Article 115(15a) LIR) and the other 50% is taxed at the personal marginal rate. That combined "corporate + half-personal" route is what people loosely call double taxation — it shrinks the gap with sole proprietorship at low profit levels.

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 AND you can keep some of it inside the company

This is the case where the SARL really wins. If you can leave a meaningful portion of your annual profit inside the company — to reinvest, build a buffer, or smooth future years — the SARL pays only the corporate rate on that retained profit (around 22% below €175k of taxable profit, ~24% above €200k), and that's it until you decide to distribute it.

For a sole proprietorship, every euro of profit is taxed at your personal marginal rate, plus the 7% solidarity surcharge (9% above €150k in class 1). At €100,000 profit, effective rate ≈ 30%; at €200,000, ≈ 38–40%.

Worked example at €120,000 profit (Luxembourg City, class 1):

Sole proprietorship — all €120k taxed at personal rate ≈ €38k tax (~32% effective)
SARL retaining €60k and distributing €60k as dividends — €26k corporate tax + ~€10k personal tax on the distributed half (50% of the dividend is exempt under Art. 115(15a) LIR, the rest taxed at marginal) ≈ €36k total
SARL retaining the full €120k — only €26k corporate tax until you choose to distribute later

The SARL wins clearly as soon as you retain a chunk of the profit. The more you retain, the bigger the gap.

The same comparison at five profit levels (Luxembourg City, class 1, indicative numbers — your situation will differ depending on family status, deductions, and the actual ICC rate of your commune):

Annual profit	Sole proprietorship total tax	SARL — retain all profit	SARL — fully extract as dividends
€50,000	~€10–11k (~21% effective)	~€11k + €535 NWT ≈ €11.5k (~23%)	~€11k corp + ~€6k personal = ~€17k (~34%)
€80,000	~€20k (~25%)	~€18k + €535 ≈ €18.5k (~23%)	~€18k corp + ~€11k personal = ~€29k (~36%)
€100,000	~€30k (~30%)	~€22k + €535 ≈ €22.5k (~23%)	~€22k corp + ~€14k personal = ~€36k (~36%)
€150,000	~€54k (~36%)	~€33k + €535 ≈ €33.5k (~22%)	~€33k corp + ~€22k personal = ~€55k (~37%)
€200,000	~€78k (~39%)	~€46k (~23%)	~€46k corp + ~€29k personal = ~€75k (~38%)

Reading this table:

The "retain all profit" column is the SARL's best case (you defer all personal taxation until distribution).
The "fully extract as dividends" column is the SARL's worst case (everything taxed both at corporate level and at the shareholder level).
The real world is somewhere in between — typically a moderate salary plus some dividends plus some retention.

A note on ICC. The municipal business tax (impôt commercial communal) applies to all commercial profit, whether you earn it as a sole proprietor or through a SARL. The threshold is different: sole proprietors get a generous €40,000 abatement (so small sole traders often pay no ICC at all), whereas a SARL has only €17,500 of abatement before ICC starts. For a SARL, ICC is baked into the ~22-24% corporate tax bundle shown in the table above. Liberal professions (BNC) are exempt from ICC entirely.

Caveat — if you consume your entire annual profit, the SARL advantage shrinks or disappears. Fully distributing as dividends adds personal tax on top of corporate tax. At €100,000 profit fully extracted as dividends, the combined burden is ~36% effective — actually slightly worse than the ~30% a sole proprietorship would pay at the same profit. The SARL only catches up at very high profit levels (≥€200k) where the sole prop hits the top 42% marginal rate. The headline "corporate 22% beats personal 42%" comparison ignores that money has to come out of the company to be of any use to you.

A tax adviser can help you structure salary + dividends to optimise — this is one of the decisions that genuinely benefits from professional help.

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
Annual running cost — minimum NWT of around €535/year (even at zero profit, if balance sheet ≤ €350k) plus an accountant for around €1,000-2,000/year (bookkeeping, annual accounts, tax return)
Catch: only natural persons, only one SARL-S per person, and your activity must fall under the business permit law (loi du 2 septembre 2011). Some liberal professions that require a business permit qualify — architect, engineer, expert-comptable. Lawyers, doctors, pharmacists, and auditors do not (they are regulated by their own Ordre outside that law).

About the €535 minimum. Two nuances worth knowing. (1) A profitable company normally does not pay €535 in cash — the minimum NWT can be offset by the prior year's IRC + employment-fund surcharge, so it gets absorbed by the larger corporate tax bill. The €535 bites mostly in loss-making years or before the company turns a profit. (2) A special €4,815/year fixed rate applies to companies whose financial assets (loans, securities, cash deposits) exceed 90% of their balance sheet AND €350,000 — typical for holding / financial structures, not for a normal operating business. If your SARL is doing real operations (selling products, services, holding inventory), you stay in the €535 bracket. There is no separate minimum corporate income tax in Luxembourg since the 2015 reform — the minimum NWT is the only annual floor.

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 AND you can retain part of the profit inside the company	SARL
You earn well but you consume your entire annual profit	Sole proprietorship is often still competitive — see "Your profit is consistently high" above
Bringing in corporate investors	SARL (not SARL-S)
Liberal profession regulated by its own Ordre — lawyer, notary, doctor, pharmacist, auditor (réviseur d'entreprises)	Sole proprietorship or classic SARL — not SARL-S
Liberal profession that requires a business permit — architect, engineer, expert-comptable	Sole proprietorship, SARL-S, or classic SARL — all three are open to you
Larger business, planning to raise equity	SA

Can I switch later?

Yes. Two distinct moves, both common.

From sole proprietorship to a company

Many businesses start as sole proprietorship, then switch to a SARL-S or SARL once revenues stabilise. This 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)

From SARL-S to classic SARL

If you start as a SARL-S and later want to become a classic SARL, you do not need to create a new company. The SARL-S is converted into a classic SARL by:

Increasing the share capital to €12,000 minimum (top up from the initial €1 or whatever you started with — the reserve you have built up under the 5% rule counts towards this)
Signing a notarial deed to amend the articles of association
Filing the change with the RCS

The company's legal personality continues — same VAT number, same RCSL number, contracts and clients are unaffected. Conversion is mandatory if the SARL-S grows past 100 employees; otherwise it is voluntary. See our SARL-S guide for the conversion mechanics in detail.

General

Switching is 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.

Switching from sole proprietorship to a company is easier to plan than unwinding one. Don't rush incorporation just because you can — many businesses do well as sole proprietorship for years, and you can convert at the moment the numbers (or the liability risk) actually justify it.

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?	Only if your profession requires a business permit under the 2 September 2011 law (architect, engineer, expert-comptable). Lawyers, doctors, pharmacists, and auditors cannot — they are regulated by their own Ordre outside that law
Can I switch from sole prop to SARL later?	Yes

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: May 2026. Rates and thresholds may change — always verify with the relevant authorities for the most current figures.

Updated on: 18/05/2026

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