According to MMM, once you accumulate 25X your spending, you are FI.
Wouldn't it be easier to say once your passive income is making at least what your job income is, then you're FI?
For example, if you make 50K a year, and your passive income hits 50K a year, then you could retire since you're making the same amount (and living on it presuming nothing changes) without going to the job anymore?
Are these just two separate ways of determining FI or do they relate to each other somehow?
Just curious since my spending changes year to year (not significantly) if I need to replace an appliance or something...but my salary is steady throughout the year (other than that measly 2.5% increase each year regardless of performance).
thanks