Interest Only Strips (IO Strips)

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Paul Tracy

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Updated August 5, 2020

What are Interest Only Strips (IO Strips)?

Interest Only Strips (IO Strips) are securities with cash flows based entirely on the monthly payments received from a mortgage pool.

How Do Interest Only Strips (IO Strips) Work?

Mortgages are paid in two parts, principal and interest. The total principal to be paid is predictable, whereas the interest paid is not predictable due to prepayments. The interest piece that is to be paid monthly is essentially stripped away from the rest of the mortgage to create another type of security called IO Strips.

Why Do Interest Only Strips (IO Strips) Matter?

Investors in IO strips must understand the risks involved if prepayments are made to the underlying mortgage pool. Primarily, prepayments will reduce interest costs and therefore cause payments to the IO holder to be lower.  By contrast, in this case, principal only (PO) investors stand to benefit to the detriment of IO investors, as the PO holder will receive the same amount of money at a quicker rate.  

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Paul has been a respected figure in the financial markets for more than two decades. Prior to starting InvestingAnswers, Paul founded and managed one of the most influential investment research firms in America, with more than 2 million monthly readers.

If you have a question about Interest Only Strips (IO Strips), then please ask Paul.

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