One of the risk measures lenders use in underwriting a mortgage is the mortgage's loan to value (LTV) ratio. A mortgage's LTV ratio is a simple calculation made by dividing the amount of the loan by the value of the home. The higher the LTV ratio, the higher the risk profile of the mortgage. Most mortgages with an LTV ratio greater than 80% require private mortgage insurance (PMI) to be paid by the borrower. And PMI is not cheap. Use a tool like a mortgage calculator to compare lenders and read on to find out whether you can avoid PMI on your mortgage. TUTORIAL: Mortgage Basics
PMI In Depth Let's take a look at an example. Let's assume the price of a home is $300,000 and the loan amount is $270,000 (which means the borrower made a $30,000 down payment) and the LTV ratio is 90%. Depending on the type of mortgage, the monthly PMI payment would be between $117 and $150. Adjustable-rate mortgages (ARMs) require higher PMI payments than fixed-rate mortgages. (To learn more about ARMs, see ARMed And Dangerous or Mortgages: Fixed-Rate Versus Adjustable-Rate.) However, PMI is not necessarily a permanent requirement. Lenders are required to drop PMI when a mortgage's LTV ratio reaches 78% through a combination of principal reduction on the mortgage and home price appreciation. If part of the reduction in the LTV ratio is realized through home price appreciation, a new appraisal, paid for by the borrower, will be required in order to verify the amount of appreciation. Easy Way Out An alternative to paying PMI is to use a second mortgage or piggyback loan. In doing so, the borrower takes a first mortgage with an amount equal to 80% of the home value, thereby avoiding PMI, and then takes a second mortgage with an amount equal to the sales price of the home minus the amount of the down payment and the amount of the first mortgage. Using the numbers from the example above, the borrower would take a first mortgage for $240,000, make a $30,000 down payment and get a second mortgage for $30,000. The borrower has eliminated the need to pay PMI because the LTV ratio of the first mortgage is 80%, but the borrower also now has a second mortgage that in most cases will carry a higher interest rate than the first mortgage. There are many types of second mortgages available, but the higher interest rate is still par for the course. Still, the combined payments of the first and second mortgage are usually less than the payments of the first mortgage plus PMI. The TradeoffWhen it comes to PMI, a borrower who has less than 20% of the sales price or value of a home to put down as a down payment has two basic options: Use a "stand-alone" first mortgage and pay PMI until the LTV of the mortgage reaches 78%, at which point the PMI can be eliminated. Use a second mortgage. This will most likely results in lower initial mortgage expenses than paying PMI, but at the same time, a second mortgage carries a higher interest rate than the first mortgage, and can only be eliminated by paying it off or refinancing both the first and the second mortgage into a new stand-alone mortgage, presumably when the LTV reaches 80% or below (so no PMI will be required). There are also several variables that can play into this decision, including: However, the most important variable in the decision is: The expected rate of home price appreciation For example, if the borrower chooses to use a stand-alone first mortgage and pay PMI versus using a second mortgage to eliminate PMI, how quickly might the home appreciate in value to the point where the LTV is 78%, and the PMI can be eliminated? This is the overriding deciding factor. For simplification, and the purposes of this discussion, we're going to ignore the other variable listed above, as price appreciation dominates these. Appreciation: The Key to Decision-MakingThe key to the decision is that once PMI is eliminated from the stand-alone first mortgage, the monthly payment will be less than the combined payments on the first and second mortgages. So we ask the questions: "How long will it be before the PMI can be eliminated?" and "What are the savings associated with each option?" Below are two examples based on different estimates of the rate of home price appreciation. Example 1: A Slow Rate of Home Price Appreciation The tables below compare the monthly payments of a stand-alone, 30-year, fixed-rate mortgage with PMI versus a 30-year fixed-rate first mortgage combined with a 30-year/due-in-15-year second mortgage. The mortgages have the following characteristics: Copyright © 2017 Investopedia.com Figure 1 In Figure 2, the annual rates of home price appreciation are estimated. Copyright © 2017 Investopedia.com Figure 2 |

（Editor：FinAll）

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