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Lenders mortgage insurance (LMI), also known as Private mortgage insurance (PMI) in the US, is insurance payable to a lender that may be required when taking out a mortgage loan. It is an insurance in the case that the mortgagor is not able to repay the loan, and the lender is not able to recover its costs after foreclosing the loan and selling the mortgaged property. The annual cost of PMI varies and is expressed in terms of the total loan value in most cases, depending on the loan term, loan type, proportion of the total home value that is financed, the coverage amount, and the frequency of premium payments (monthly, annual, or single).

The PMI may be payable up front, or it may be capitalized onto the loan in the case of single premium product. This type of insurance is usually only required if the downpayment is less than 20% of the sales price or appraised value (in other words, if the loan-to-value ratio (LTV) is 80% or more). Once the principal is reduced to 80% of value, the PMI is often no longer required. This can occur via the principal being paid down, via home value appreciation, or both. In the case of lender-paid MI, the term of the policy can vary based upon the type of coverage provide (either primary insurance, or some sort of pool insurance policy). Borrowers typically have no knowledge of any lender-paid MI, in fact most "No MI Required" loans actually have lender-paid MI, which is funded through a higher interest rate that the borrower pays.

Sometimes lenders will require that LMI be paid for a fixed period (for example, 2 or 3 years), even if the principal reaches 80% sooner than that. Legally, there is no obligation to allow the cancellation of MI until the loan has amortized to a 78% LTV ratio (based on the original purchase price). The cancellation request must come from the Servicer of the mortgage to the PMI company who issued the insurance. Often the Servicer will require a new appraisal to determine the LTV. The cost of mortgage insurance varies considerably based on several factors which include: loan amount, LTV, occupancy (primary, second home, investment property), documentation provided at loan origination, and most of all, credit score.

If a borrower has less than the 20% downpayment needed to avoid a mortgage insurance requirement, they might be able to make use of a second mortgage (sometimes referred to as a "piggy-back loan") to make up the difference. Two popular versions of this lending technique are the so-called 80/10/10 and 80/15/5 arrangements. Both involve obtaining a primary mortgage for 80% LTV. An 80/10/10 program uses a 10% LTV second mortgage with a 10% downpayment, and an 80/15/5 program uses a 15% LTV second mortgage with a 5% downpayment. Other combinations of second mortgage and downpayment amounts might also be available. One advantage of using these arrangements is that under United States tax law, mortgage interest payments may be deductible on the borrower's income taxes, whereas mortgage insurance premiums were not until 2007. In some situations, the all-in cost of borrowing may be cheaper using a piggy-back than by going with a single loan that includes borrower-paid or lender-paid MI.

In the United States, homeowners earning under $110,000 adjusted gross income can deduct, for the 2007 tax year, some or all of the LMI/PMI premium on mortgages closed only in 2007. With this new change, homebuyers may want to weigh both options. Congress would need to renew this deduction for it to be valid for any tax years beyond 2007.

• Mortgage insurance

• Buying a home with little down
• In 2007, mortgage insurance will be tax-deductible
• When and how to cancel your PMI

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