The pure definition of an "installment loan" is a loan taken out with definite, regular and fixed terms, both as to amount due, and date due, usually monthly. That is the contracted "installment" against repayment of the debt. With that being said, any personal loan, auto loan, or mortgage is technically an installment loan. However, FairIsaac has stated (see their Credit Education Webinar) that they do NOT score all installment loans the same. In particular, mortgage loans, with much lower risk of default, are clearly scored differently from personal unsecured loans, which have a much higher risk of default . Auto loans are also secured, so they fall in the middle. Credit mix is not simply installment vs revolving. There are gradients in both, but exaxctly what those gradients are and how they are scored is a proprietary part of the FICO algorithm that is not public informattion, so all we can offer on this site is anecdotal advice. One thing that can bank on is the absence of any revolving credit is a FICO no-no.
With 4 open installment loans, I would doubt that a new auto loan would have impact on credit mix. In fact it would initiate a hard inquiry to set it up, and also affect your %util, so would hit you in two other FICO categories, of which credit mix is the least significant. Credit mix is only 10% of total FICO, so not a major factor even on the larger scale.
Message Edited by RobertEG on
05-08-2008 03:29 PM