To file a tax appeal:
Submit a formal written claim to DIL within the legal deadline (usually 90 days after receiving your tax notice or decision).
If your claim is rejected or no response is received, you may escalate by:
Requesting an internal review or reconsideration,
Filing an administrative appeal to the Conciliator,
Filing a judicial appeal before the Administrative Tribunal.
In all cases, keep detailed records of your correspondence, and seek legal or fiscal advice when needed.