Audit in Luxembourg

Whether a Luxembourg company needs a statutory audit depends on its legal form and its size, measured by balance sheet, turnover and staff. Companies below the thresholds may still choose an audit, or be asked for one by a bank, a lender or investors, and regulated entities such as funds have their own rules. For a public limited company, Guichet.lu explains that above the size thresholds the accounts go to an approved statutory auditor (réviseur d’entreprises agréé), and otherwise to one or more commissaires aux comptes. Many accounting firms also offer reviews and agreed procedures that fall short of a full audit.

Firms offering audit in Luxembourg

OLISTONE

Accounting firm · Boutique firm

Steinsel

  • Company formation
  • Accounting and bookkeeping
  • Tax compliance
  • +6 more

Languages: English · French

View profile of OLISTONE

Welter Sàrl

Accounting firm · Boutique firm

Kehlen

  • Company formation
  • Accounting and bookkeeping
  • Tax compliance
  • +4 more

Languages: Luxembourgish · French · German · English

View profile of Welter Sàrl

30 more firms offering audit in Luxembourg

What to ask an audit firm

Ask whether your company crosses the audit thresholds this year or is likely to next year, and who decides that. Ask whether the person signing the report is an approved statutory auditor and how the firm keeps its independence if it, or a firm in its network, also offers you bookkeeping or tax work. If your company sits in a group, ask whether the firm can work with the group’s auditor abroad and report on the timetable your parent company needs. Agree the fieldwork dates, the documents expected and the fee in writing before the year end.

Audit firms on Accountanty

Accountanty lists 54 firms in Luxembourg that offer audit, 47 of them accounting firms and seven corporate service providers. Thirty-five are small, eight medium-sized and 11 in large networks. Forty-four work in English and 39 in French. Forty-two are in Luxembourg City, two in Strassen and one in Bertrange. The year’s bookkeeping is covered on accounting in Luxembourg.

Frequently asked questions

Does every Luxembourg company need an audit?

No. The duty depends on the company's legal form and size, and smaller companies are often exempt. A bank, a lender or the shareholders can still ask for one, so check with an adviser before the first financial year ends.

Can the same firm keep the books and audit a Luxembourg company?

Independence rules limit the other work an auditor may do for a company it audits. Many owners keep bookkeeping and the audit with different firms from the start, and any firm offering both should explain how it separates them.

Where are the audit firms on Accountanty located in Luxembourg?

Forty-two of the 54 audit firms listed for Luxembourg are in Luxembourg City. The rest are spread across smaller towns, including two in Strassen and one in Bertrange.

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General information, not legal or tax advice. Rules, rates and fees change: check them with the official sources linked on this page or with a qualified adviser before you act.