Mathias Kallehauge
Senior Consultant, Crossbord | International Tax & Year-End Reconciliation
Mathias Kallehauge, Senior Consultant
Mathias Kallehauge is a senior consultant specialising in cross-border assignments at year-end, where the reporting has to hold up in more than one jurisdiction. He prepares Danish tax returns for inbound and outbound employees, allocates employment income between countries under the relevant double taxation agreement, and reconciles each assignment into a single, consistent record.
International tax and year-end reporting
Mathias works on the practical questions employers face: what has to be reported, in which country, and how to document it so the position holds. His work covers four areas:
- Year-end reconciliation. Bringing an employee’s obligations across jurisdictions into one reconciled position on the annual tax statement (årsopgørelse).
- Cross-border income allocation. Determining how employment income is split and taxed when the work spans borders, applying the 183-day rule and treaty relief.
- Danish tax returns for inbound and outbound employees. Reporting whether an employee is entering or leaving Denmark.
- Double taxation
Get to know Mathias: his background, interests, and path to Crossbord
Sector experience
Mathias has most of his experience in the sectors where the reporting is rarely straightforward: offshore, shipping, and large engineering projects with staff moving between sites and countries.
- Engineering and construction
- Production and manufacturing
- Shipping and offshore
- Corporate and office-based roles
Education and languages
Education
Master of Science (MSc) in Business Law, Aalborg University, 2023
Languages
- Danish
- English
Get expert support with cross-border compliance in Denmark
Crossbord supports employers with Danish tax returns for inbound and outbound employees, cross-border income allocation, and the year-end reconciliation that closes an assignment cleanly.
By combining tax, payroll, and social security into one coordinated solution, we reduce the risk of an error in one area surfacing as a problem in another, so an internationally mobile workforce can be reported consistently, year after year.