Yanbu op. I can completely understand that train of thought.
I work full time. I earn a decent, full time income and pay my tax. I have colleagues that earn the same as me and work their hours, pay their tax based on their full time income, and that’s it...fair enough.
I choose to do overtime on the weekend sometimes. Yes, it’s my choice, yes i’m lucky to have a job and a head on my shoulders and all the rest...but that’s not the point.
I do an extra ten hours work, earn an extra ten hours income. That’s (obviously) beneficial for me, but also for my company who would otherwise have had to shell out a fortune for temp staff and therefore the taxman.
My colleague and I have already paid tax on our full time incomes...to have to pay it on the work you do over and above what is expected or required...I think there’s a good arguement that it should be exempt.
I don’t think it could ever work in practice but yes, I do think it would be fairer if tax were capped at full time hours.