What is Alt-A Lending?

An Alt-A mortgage, short for Alternative A-paper, is a type of U.S. mortgage that, for various reasons, is considered riskier than A-paper, or "prime", and less risky than "subprime," the riskiest category. Alt-A interest rates, which are determined by credit risk, therefore tend to be between those of prime and subprime home loans.
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Characteristics of Alt-A

Within the U.S. mortgage industry, different mortgage products are generally defined by how they differ from the types of "conforming" or "agency" mortgages, ones guaranteed by the Government-Sponsored Enterprises (GSEs) Fannie Mae and Freddie Mac.

There are numerous factors that might cause a mortgage not to qualify under the GSEs' lending guidelines even though the borrower's creditworthiness is generally strong. A few of the more important factors are:

* Reduced borrower income and asset documentation (for example, "stated income", "stated assets", "no income verification")
* Borrower debt-to-income ratios above what Fannie or Freddie will allow for the borrower credit, assets and type of property being financed
* Credit history with too many problems to qualify for an "agency" loan, but not so many as to require a subprime loan (for example, low scores or serious delinquencies, but no recent charge-offs or bankruptcy)
* Loan to value ratios (percentage of the property price being borrowed) above agency limits for the property, occupancy or borrower characteristics involved

In this way, Alt-A loans are "alternatives" to the gold standard of conforming, GSE-backed mortgages.

A classification of mortgages where the risk profile falls between prime and subprime. The borrowers behind these mortgages will typically have clean credit histories, but the mortgage itself will generally have some issues that increase its risk profile. These issues include higher loan-to-value and debt-to-income ratios or inadequate documentation of the borrower's income.
Investopedia Says... These types of loans are attractive to lenders because the rates are higher than rates on prime classified mortgages, but they are still backed by borrowers with stronger credit ratings than subprime borrowers. However, with the higher rates comes additional risk for lenders because there is a lack of documentation - including limited proof of the borrower's income.