Non-profit accounting in Luxembourg: ASBL obligations under the 2023 law

The transition period is over: since 23 September 2025, every Luxembourg ASBL, including those founded before 2023, must apply the accounting regime of the law of 7 August 2023. Many associations still keep their books in a spreadsheet inherited from the previous treasurer. Here is what the law actually requires, depending on your association's size, and how to get compliant without sacrificing your evenings.

What are the accounting obligations of a Luxembourg ASBL?

A Luxembourg ASBL must keep accounts matching its size: a statement of receipts and expenditure with notes for small associations, double-entry bookkeeping with a balance sheet, profit and loss account and notes for medium ones, and the corporate accounting regime with a statutory auditor (réviseur d'entreprises agréé) for large ones. Annual accounts are then filed with the RCS.

Small, medium or large: where does your ASBL sit?

The law of 7 August 2023 sorts associations into three categories, based on three criteria measured over two consecutive financial years: average headcount in full-time equivalents, annual income, and total assets.

A concrete example: an association employing two half-time staff (1 FTE), collecting €45,000 in membership fees and grants, but owning premises valued at €250,000, exceeds only one criterion (assets). It remains a small ASBL. If its income settles durably at €60,000, two criteria are exceeded and it moves into the medium category, where double-entry bookkeeping becomes mandatory.

Special case: associations recognised as being of public utility follow the large-ASBL regime regardless of size, and submit their accounts to the Ministry of Justice on top of the RCS filing.

The RCS filing, the oversight that costs

The ASBL's annual accounts are approved by the general meeting and then filed with the Trade and Companies Register (RCS), in practice no later than 7 months after year-end. An ASBL closing on 31 December should therefore have filed by the end of July. This is the compliance point most often missed: the association keeps running, activities go on, and nobody thinks of the filing until a grant application or a bank asks for filed accounts. Also worth noting: like companies, ASBLs must declare their beneficial owners to the RBE register.

Keeping an ASBL's books in Odoo

For a small ASBL, a well-kept spreadsheet can be enough to produce the statement of receipts and expenditure. The real problem lies elsewhere: the treasurer changes, the file breaks, the history disappears. As soon as the association employs staff, manages grants or approaches the thresholds, a proper accounting tool becomes the peace-of-mind option.

Odoo covers this ground well, for three specific reasons:

• Painless double entry: the chart of accounts builds on the PCN 2020 structure, adapted to association specifics (membership fees, donations, grants). Growing from small to medium ASBL does not require changing tools; the books are already double-entry behind the scenes. The setup follows what we describe in our guide to Luxembourg accounting in Odoo.
• Tracking by project and by grant: analytic accounting isolates each grant or activity, so you can show a ministry or a commune exactly how their funding was used. That is often a condition of the grant itself.
• Membership fees and the bank: invoicing fees, tracking them and synchronizing bank accounts removes the manual matching of members' transfers.

For the balance sheet and P&L due at year-end, the mechanics are the same as for a company: we covered them in our article on filing annual accounts in Luxembourg.

What about taxes for an ASBL?

An ASBL is not taxable by principle on its non-profit activities, but the exemption is no blank cheque: a regular economic activity (a permanent bar, sales, invoiced services) can trigger VAT registration, or even partial taxation. The line is drawn case by case, and it is exactly the kind of question to settle with a professional before the administration asks it. We inform here; we do not replace an analysis of your specific situation.

Frequently asked questions

Does my small ASBL need double-entry bookkeeping?

No. If your association exceeds no more than one of the three thresholds (3 FTE, €50,000 income, €100,000 assets) over two consecutive years, a chronological statement of receipts and expenditure with notes is enough. Double entry remains allowed, and useful if you are approaching the thresholds.

Must an ASBL file its accounts with the RCS?

Yes, whatever its size. The annual accounting documents approved by the general meeting are filed with the RCS, in practice no later than 7 months after year-end.

When does an ASBL need a statutory auditor?

When it becomes a large association, meaning it exceeds at least two of the three thresholds (15 FTE, €1,000,000 income, €3,000,000 assets) for two consecutive years. Public-utility ASBLs are subject to audit regardless of size.

Are ASBLs founded before 2023 concerned?

Yes. The 24-month transition period granted to existing associations ended on 23 September 2025. Since then, the accounting regime of the law of 7 August 2023 applies to all ASBLs.

Going further: Setting up Luxembourg accounting in Odoo · Filing annual accounts in Luxembourg

Why Advena?

We support associations the way we support SMEs: setting up the books (a structured spreadsheet or Odoo depending on size), producing the statement of receipts and expenditure or full annual accounts, and filing with the RCS. And when the ASBL grows, the tool and the team scale with it, without a rupture.