Originally Posted by
Fabo.sk
Taxes, at best.
But, you can just abandon and not fly the return leg.
In Europe, yes, if you do not do it consistently. But several airlines in the US are getting angry at such things, a variant of skiplagging. I think not taking a return is less prone to sanctions, since you can always argue that plans changed, etc.
https://www.insider.com/skiplagging-...anceled-2023-7