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Economics of buy-to-let (investment) flats
Surely the yield should be Yield = (Rent - Costs) / Downpayment ? As you want the yield relative to your capital not to the property value. As for the opportunity cost part you could look at the risk free rate of return you could obtain, either through government bonds or bank accounts with some sort of government guarantee (not sure what practical terms are for this in Finland). The management fee is almost 30% of your rent, what does this cover? Is it possible to manage the property yourself, as this would give you a much larger cushion between rent and expenses.