Therein lays one of the key shortcomings of traditional accounting: there is no allowance for a change in the cost of capital in the accountant's methodology, even though it is incredibly relevant to an asset's value.

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The first thing you need to do is talk to your loan officer and accountant to determine your total interest cost, net of the tax benefit, which will tell you how much your investment portfolio needs to earn in order to pay off the interest-rate charges of your mortgage.

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To the accountant, depreciation is the allocation of the cost of an asset over the expected useful life of the asset.

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Your accountant should be able to advise you on how to get that cost accounting system in place.

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Your broker, your insurance agent, your accountant, your banker, even your lawyer might likewise concoct a plan for you, with the cost somewhere in between.

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