In some circumstances PMI can be avoided by using a piggy-back mortgage. It works like this: If you want to purchase a house for $200,000 but only have enough money saved for a 10% down payment, you can enter into what is known as an 80/10/10 agreement. You will take out one loan totaling 80% of the total value of the property, or $160,000, and then a second loan, referred to as a piggyback, for $20,000 (or 10% of the value). Finally, as part of the transaction, you put down the final 10%, or $20,000.
By splitting up the loans, you may be able to deduct the interest on both of them and avoid PMI altogether. Of course, there is a catch. Very often the terms of a piggyback loan are risky. Many are adjustable-rate loans, contain balloon provisions or are due in 15 or 20 years (as opposed to the more standard 30-year mortgage).