Advisius

Advisius is an independent Belgian boutique law firm based in Brussels, exclusively dedicated to tax law. Founded in 2020, the firm advises companies, executives, families, and professional advisers on complex Belgian and international tax matters. Its expertise covers corporate taxation, international mobility, wealth planning, management incentive schemes, tax rulings, audits, and tax litigation. Advisius also offers a dedicated French Desk for France–Belgium tax matters. Combining technical excellence with a pragmatic and business-oriented approach, the firm provides tailored tax solutions and can either coordinate multidisciplinary cross-border projects or work seamlessly alongside clients’ existing advisers.