Accounting for a tradesperson in Luxembourg: the owner's guide

In short. A tradesperson in Luxembourg keeps the same books as any other company, but with four pressure points all their own: a business permit usually tied to a qualification, VAT that switches between the standard 17% rate and the 3% housing rate, jobs billed through deposits and progress statements, and an owner most often affiliated as self-employed. Kept well, these books tell you your margin job by job as you go. Kept badly, they come down to a pile of invoices discovered at year-end. At Advena, they start at 325 € per month, all in, inside the tool we deploy.

Electrician, painter, heating engineer, joiner, tiler: the trade differs, but the accounting machinery of a Luxembourg craft business looks much the same from one to the next. And it has its own traps, which neither a generic guide nor a spreadsheet covers. Here is what really changes when you keep a tradesperson's books in Luxembourg, in plain terms, in the order it plays out.

Before the books: the permit and the qualification

A tradesperson cannot start without a business permit, and for most craft trades that permit requires a professional qualification: a diploma, a master craftsman's certificate or recognised experience, depending on the activity. Some trades on list C are exempt, but professional standing is always required. It is the first link in setting up, and it conditions everything else, including opening the bank account and issuing the first invoice. We cover the procedure, the 50 € fee and the three-month deadline in our guide to the business permit in Luxembourg.

On top of this comes registration with the Chamber of Trades, the reference body for craft activities, and affiliation to social security. Once these formalities are behind you, the accounting takes over, and that is where the trade leaves its mark.

A tradesperson's VAT: two rates living side by side

This is the quirk that weighs most day to day. A tradesperson working on homes rarely bills at a single rate. On the same job, labour and certain works built into the fabric of the building can fall under the super-reduced 3% rate reserved for a dwelling used as a main residence, while other lines stay at the standard 17% rate.

The 3% rate is not automatic: it requires either an approval obtained before the works to apply it directly, or billing at 17% followed by a refund claim from the owner, all within a benefit capped at 50,000 € per dwelling. Pick the wrong path and you bill 3% with no right to it and owe the difference after an audit. We devoted a full guide to this, with the list of covered and excluded works, in our article on the 3% housing VAT rate for the tradesperson who invoices.

The direct accounting consequence: an invoice mixing lines at 3% and 17% must split the base and the tax by rate. That is not an accountant's nicety, it is a mandatory detail, and it is exactly what an audit looks at. So your invoicing tool has to carry both rates, mapped to the right PCN 2020 accounts, and your items should inherit the correct default rate to avoid guesswork entries.

Billing a job: quotes, deposits and progress statements

A tradesperson does not sell a product off the shelf: they sell a job that unfolds over time. The commercial chain starts with a quote, continues with deposits on order, then progress statements as the work advances, and settles with a final invoice. This reality has two accounting implications that are often overlooked.

First, VAT on a deposit is in principle due when that deposit is received, not at the end of the job. A deposit collected in December is declared in the relevant period, even if the job finishes in March. Second, a job straddling two financial years forces you to book income and costs in the right year, failing which one year's margin inflates the next. Real-time accounting, job by job, handles this naturally; accounting rebuilt once a year almost always misses it.

Purchases, materials and small stock

On the spending side, a tradesperson buys materials, often across several countries. A tiler sourcing in Belgium and Germany makes intra-EU acquisitions, subject to VAT reverse charge. The mechanism is cash-neutral when set up correctly, but it requires a valid supplier VAT number and the right fiscal position, failing which the return is wrong. It is the same groundwork described in our article on intra-EU VAT in Luxembourg.

Most tradespeople hold no stock in the sense a wholesaler would, but rather materials committed to jobs and small tools. The accounting dividing line matters: durable tools go on the balance sheet and are depreciated, while consumables are expensed. Typing these costs correctly at entry avoids false fixed assets and a year-end to untangle.

The tradesperson-owner: almost always self-employed

A manager who holds the company's business permit and more than 25% of its shares is treated as self-employed, not as an employee. They affiliate themselves to the Joint Social Security Centre and pay all of their own contributions on their income, around 24%, with a well-known trap: contributions are first called provisionally, then recalculated once the tax assessment is known, which can trigger a catch-up of several thousand euros on income already spent. We explain this mechanism and how to smooth it in our article on self-employed social contributions in Luxembourg.

If the business employs workers, payroll is added: monthly returns, withholdings, and an employer cost that goes well beyond gross pay. Payroll is among the duties most tradespeople hand to their accounting firm, precisely so as not to miss a social deadline.

What the law expects, in every case

Beyond its specifics, a tradesperson remains subject to the accounting duties common to any Luxembourg company: regular bookkeeping under PCN 2020, annual accounts approved and filed with the trade register on time, VAT returns on eCDF, the tax return, and keeping records for ten years. We give the full list, deadline by deadline, in our guide to the accounting obligations of an SME in Luxembourg.

Track margin per job, not just the overall result

This is what separates accounting that informs from accounting that merely records. A tradesperson who looks only at the annual result knows whether they made money, but not on which jobs. Analytic accounting per job changes that: each quote becomes a cost centre, hours, materials and subcontracting attach to it, and you read the real margin of a finished job, or the drift of a running one while there is still time to act. That is exactly what real-time bookkeeping in a management tool allows, rather than a folder of invoices handed over the following spring.

Who this model is not for

Let's be straight. Our support is aimed at the Luxembourg craft business of 1 to 50 people that wants to steer its jobs, not just stay compliant. If you are a tradesperson billing two jobs a year and looking only for the rock-bottom price to drop off a box of invoices once a year, a lighter model will do. And on a disputed housing-VAT case, we point you to the Registration Duties Authority rather than ruling in its place: we inform on the rule, we do not rewrite it.

Frequently asked questions

Does a tradesperson have to use an accounting firm in Luxembourg?

No, the law does not require it. But the craft business remains liable for its bookkeeping, VAT returns, annual accounts and contributions. Without an in-house accountant, most tradespeople hand these duties to a firm to secure the deadlines and the multi-rate VAT.

What VAT rate does a tradesperson apply to a renovation?

The standard rate is 17%. The super-reduced 3% rate applies only to a dwelling used as a main residence, in the cases provided for (new build, renovation within five years of purchase, or a dwelling at least twenty years old), and requires prior approval or a refund claim by the owner.

Does a tradesperson-manager pay contributions like a self-employed person?

Yes, if they hold the business permit and more than 25% of the company's shares. They affiliate themselves to the Joint Social Security Centre and pay all of their contributions on their income, with a recalculation once the tax is known.

How do you bill a job spread over several months?

Through deposits on order and then progress statements as the work advances, with a final invoice. VAT on each deposit is due when it is received, and a job straddling two financial years must book income and costs in the right year.

Do you need special software for a tradesperson's accounting?

No software is required by law. At Advena, we keep the books in Odoo, configured for Luxembourg, with the housing VAT rates and per-job tracking included in the service. If you already use another tool, we discuss it before any migration.

Further reading

• The 3% housing VAT rate in Luxembourg: a guide for tradespeople
• Business permit in Luxembourg: conditions, procedure and cost
• Self-employed social contributions in Luxembourg in 2026
• Accounting obligations of an SME in Luxembourg: the full list
• Accounting firm in Luxembourg: the complete guide for an SME

Why Advena?

We keep the books of Luxembourg craft businesses on a fixed fee, from 325 € per month, all in: day-to-day accounting, VAT and eCDF filing, annual accounts and register filing, payroll, a monthly review with a dedicated manager and permanent access to your books in real time. The difference: we keep your books in the Odoo we configure for Luxembourg, housing VAT rates and per-job tracking included, so you read your margin as you go rather than at year-end. No invoice outside the monthly fee, and no tax advice dressed up as certainty on a disputed case.