Should I take a promotion even if my income will end up decreasing?

I’m a firefighter and currently I’m able to work a lot of overtime. This is because it’s more available to firefighters and the schedule is more conducive to taking overtime. If I’m promoted I’ll have to do office work Mon-Fri instead of my current 24 on 72 off. This will be the case until someone else gets promoted after I do. Then I’ll go back to the schedule I’m on now. Since I won’t be able to work as much overtime, I’ll actually end up making less money.

Should I take a promotion even if my income will end up decreasing?
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