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Is there a formula to use to analyse whether an investment property is a good investment?
When you invest in a property, you pay money to purchase the property. You didn't have to spend the money on the property though - you could have invested it in the stock market instead, and expected to make a 4% annualized real rate of return or thereabouts. So if you want to know whether something's a "good investment", ask whether your annual net income will be more or less than 4% of the money you put into it, and whether it is more or less risky than the stock market, and try to judge accordingly. Predicting the net income, though, is a can of worms, doubly so when some of your expenses aren't dollar-denominated (e.g. the time you spend dealing with the property personally) and others need to be amortized over an unpredictable period of time (how long will that furnace repair really last?). Moreover your annualized capital gain and rental income is also unpredictable; rent increases in a given area cannot be expected to conform to a predetermined mathematical formula. Ultimately it is impossible to predict in the general case - if it were possible we probably would have skipped that last housing bubble, so no single simple formula exists.