In my opinion your number is $900,000 which is: 1500 / month * 12 months / year * 2 for taxes (this feels genetically safe as a high bar but maybe not) * 25 in order to safely pull 4% yearly forever Trying to come up with a plan to get a business running that can safely yield 1500 / month (more for taxes) can be dicey and prone to all sorts of risk, and the time horizon is unknown. Just saying, don’t discount levelin…
I assume the meeting of the "number" stated here is an estimate of how much wealth would need to be invested in a stock portfolio to yield 1500/month net of taxes and inflation, without needing to trade time/labour for income. Pretty reasonable, but without knowing more about OP's situation, advising someone asking how they can earn more income on the side to earn it by having $1m wealth invested in the share market…
But I would love to be able to earn enough to live (simple, I don’t need a luxury life) while saving the rest to become financial independent at some point.