Deloitte Luxembourg has reported gross revenues of €535 million for the 2025 financial year, which represents an increase of 5% on its 2024 results.

The Big Four firm’s seventh Impact Report, which serves as an annual report but focuses on its social, governance and environmental performance as well as its business-related results, shows that Deloitte Luxembourg has seen net revenues grow at a compounded annual rate exceeding 10% over the past four years.

The report did not detail departmental performances, but in a press statement said that its audit and assurance branch delivered double-digit growth, and that tax “recorded solid growth in a period of significant regulatory and geopolitical change.”

The advisory and consulting arm strengthened its work in automation, AI integration and new delivery models, the firm said.

The report was published as Deloitte marks its 75th anniversary in Luxembourg. The global firm was founded in London 180 years ago in 1845.

“These years are not a measure of time but a foundation on which our firm continues to grow,” Deloitte Luxembourg CEO and managing partner John Psaila wrote in his introduction to the 2025 Impact Report.

The firm now numbers approximately 2,600 professionals in Luxembourg, with staff turnover hovering at a steady rate of 18% (down from 18.2% in 2024). It received 76,061 applications in the 2025 financial year, the company said.

Women make up 48% of staff but just 22% of partners or managing directors, according to the report. The firm was keen to showcase its diversity, equity and inclusion committee advanced programmes, which include a women in/to leadership, and a working parents project.

Each employee received an average of 46 hours of training, and the firm celebrated 507 promotions across its service lines.

“Our teams recognise that responsibility today lies in combining sound performance with thoughtful practice, including the sustainability expectations shaping our world,” Psaila said. “In a period marked by rapid advances in AI and GenAI, evolving regulation, and growing expectations around transparency, the firm continues to broaden its capabilities while supporting transformation with purpose and respect,” he added.