FIRE is definitely about income just as much as it is about being frugal and saving. Having a high income is what enables the RE part. There is a base level be

FIRE is definitely about income just as much as it is about being frugal and saving. Having a high income is what enables the RE part. There is a base level beyond which you can't save much, so first order of business is maximizing your income (e.g. better job/raise/promotion) without going bananas and sacrificing your health for it.