Yesterday I had a discussion with my colleague.
This year I am traveling rather large distances for work. My colleague asked me how I can bear the costs of travel. I told her it is ok, because the government allows me to deduct a large part of my travel costs from my taxes.
My colleague warned me that she has heard that the government will revoke these rules, making it no longer possible to deduct as much of my travel costs from my taxes.
Her argument was that since my taxes for 2019 will be done in april of 2020, the government could, at any point before that date, change the rules so that I may no longer be able to deduct my travel expenses.
I argued that rules could only apply to travels/work that occurred after said rules were implemented, and could not apply retroactively.
Norway has an "ex post facto" clause in its constitution against retroactive laws.
Is my reasoning correct?