You may be familiar with the gross income multiplier. This simple formula for determining the value of rental real estate has been around for ages.
The first book I read on investing in real estate advised me to "never buy a property with a GIM of more than 8." GIM is the acronym for gross income multiplier, of course, and the formula is this: divide the price by the gross annual rents to get the GIM.
In other words, the author was advising me to never pay more than 8 times the annual rent for a rental property. That seemed simple enough. I started looking at properties in terms of GIMs. If it was selling for 6 times rent it must be a good deal. If it was 12 times rent it had to be bad. It was great to have such a simple rule to follow - except that it never was a good rule to begin with.
Using a gross income multiplier is a crude way to put a value on a property. It is just too simplistic. Suppose two buildings each are selling for eight times their gross annual rent collections. One however, includes all utilities in the rent that tenants pay. That changes things, doesn't it? Of course, you could try to subtract out the utilities, to see what rents would be if they weren't included, and use that for the GIM. But that's not the only problem.
You need to constantly change the GIM expectations to reflect interest rates, because a property might be profitable at 12 times rent when interest rates are low, but a money loser at eight times rent if the financing is expensive.
Also, there are just plain different expenses for different properties, whether higher maintenance costs, insurance premiums, or whatever. Gross rent doesn't say much about the factor that really makes a rental property valuable: the net income.
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