Credit Mix

Credit mix is the variety of different kinds of credit account represented on a person's credit report, and it is a named input to a credit score rather than a legal or regulatory concept. The name belongs to Fair Isaac, which uses it for its own model component: its consumer education page is headed "What Does Credit Mix Mean?" and states that "the types of credit you have are known as your credit mix," which "can include a mix of accounts from credit cards, retail accounts, installment loans, finance company and mortgage loans." The same page states the weight: "credit mix determines 10% of a FICO Score."

It is worth separating this from the record it is computed from. Credit history is the underlying conduct, and the credit report is the file a consumer reporting agency keeps. Credit mix is one of five categories a particular family of models derives from that file. So the report is a document, the history is behavior, and the mix is an observation a model makes about the document.

One caveat travels with every percentage in this area, and Fair Isaac publishes it itself: "Even the levels of importance shown in the FICO Scores chart above are for the general population and may be different for different credit profiles." The 10 percent describes a typical file, not an arithmetic weight applied to yours.

What the factor actually looks at. Fair Isaac lists the account types its scores consider for mix as credit cards, retail accounts, installment loans, finance company accounts and mortgage loans, and adds a sentence that does more work than the list: "Don't worry, it's not necessary to have one of each." So the factor is not a checklist to complete. It also does not operate in isolation: "FICO not only looks at the mix of credit you have but also at the payment history of these credit types," and the company's illustration is a file with a good mix of installment and revolving accounts but poor payment history, where the score reflects the payment history, which is a category weighted three and a half times as heavily.

The substantive axis is revolving against installment, and Fair Isaac supplies both lists. Revolving accounts "provide you with credit that allows more flexibility regarding the amount paid monthly," subject to minimum payments and due dates, and it names credit cards, retail store cards, gas station cards and a home equity line of credit. Installment accounts "usually require a fixed payment each month until the balance is paid down in full," and it names a mortgage, an auto loan and a student loan. The distinction is not cosmetic: the two kinds of account create different obligations and produce different evidence about a borrower, which is the reason a model would look at the composition at all rather than only at the count.

Those are a scoring vendor's working descriptions rather than legal definitions, and the difference is worth flagging because the legal line is drawn elsewhere. Regulation Z sorts consumer credit into open-end and closed-end on the replenishment feature, not on payment flexibility, so a product's legal category and its scoring category are answered by different tests. Where the legal category is what matters, that is the definition to use.

Fair Isaac's own answer to the question everybody arrives with is no. The standard advice is to open a loan to round out a thin mix. Its page addresses that directly: "Okay, so a good credit mix can help your credit score. Does that mean you should start applying for all the types of credit lines you don't currently have? No." It then gives two reasons of its own. Applying produces a hard inquiry, which it says typically lowers a credit score. And "if a creditor sees you've opened an inordinate amount of new accounts within a small time frame, it could indicate to them that you're experiencing financial distress, whether true or not," with a likely denial as the consequence.

Its conclusion weighs the two sides explicitly: "if you want to add something to your credit mix that's currently missing, balance the risk versus the reward. Is it worth a drop in your score to apply for a small loan to show creditors you can manage payments successfully? With credit mix being such a small percentage of your credit score, the answer is, 'probably not.' However, in the end, the final decision is yours." A source-backed answer of "probably not" from the company whose model is being optimized for is unusually direct, and it is the most useful thing on this page.

Fair Isaac also puts the factor's practical significance in proportion: "since credit mix is only 10% of your FICO Score, it most likely won't determine whether or not you obtain credit from lenders. However, if you're striving to bring your FICO Score to the highest level it can be, your credit mix can play a part."

The two model families do not agree that this is a separate factor at all. This is the strongest reason not to treat credit mix as a universal scoring category, and both sides are published.

Fair Isaac groups its data into five categories: "payment history (35%), amounts owed (30%), length of credit history (15%), new credit (10%) and credit mix (10%)." Mix and length are two of the five, together accounting for a quarter.

The VantageScore 4.0 User Guide, revision September 2022, lists six generalized scoring factors, and one of them is a merger of exactly those two: "Age and Type of Credit — Length of credit history and types of credit." Its published contribution figures are Payment History 41 percent, Age and Mix 20 percent, Utilization 20 percent, New Credit 11 percent, Balance 6 percent and Available Credit 2 percent.

Those two sets of percentages are not the same kind of number and should not be compared as though they were. Fair Isaac's are stated importance levels for the general population. VantageScore's own guide explains that its chart "is simply the average of all consumers' individual-level contribution to score calculations" and that it shows "the final factor contribution percentages for the 2014—2016 holdout population," so it is an averaged, back-tested measurement taken on a specific historical sample. Both figures are published by the model's developer and neither is a coefficient you can apply to your own file. And both belong to a named model version: a statement about VantageScore 4.0 is not a statement about VantageScore generally, any more than a statement about a particular FICO Score version is.

The factor is an observation about composition, so working it out is a counting exercise rather than a calculation.

1. List the open accounts on the report, which is where the data comes from.

2. Sort them by kind, revolving or installment, using the categories Fair Isaac names.

3. Note that count is not the same as variety. Several accounts of one kind are one kind.

4. Stop there. There is no target composition, and Fair Isaac says it is not necessary to have one of each type.

A hypothetical illustration, with no dollars because the factor does not use any. Two people each have three or four accounts in good standing.

Rafa holds four credit cards. That is four accounts and one kind: all revolving.

Imelda holds one credit card, one auto loan and a mortgage. That is three accounts and two kinds: one revolving and two installment.

Imelda's file shows evidence of managing both structures and Rafa's shows evidence of managing one, which is the whole of what the factor observes. Two things follow that the illustration makes visible. First, Rafa cannot improve this without acquiring a loan he has no other use for, and Fair Isaac's own answer to that is "probably not," since applying costs an inquiry and a cluster of new accounts can itself read as distress. Second, if Rafa's payment history is poor and Imelda's is good, the comparison between them is settled three and a half times over by a different category before mix is reached at all.

Pros

• It is a genuine input, so a file that already contains both revolving and installment accounts gets whatever benefit is available without any action.
• Fair Isaac states outright that it is not necessary to have one of each type, so there is no composition to chase.
• At 10 percent it is the smallest FICO category alongside new credit, which means it is rarely the reason an application fails.
• Because it reflects accounts you took on for real reasons, it improves as a byproduct of ordinary borrowing rather than requiring a strategy.

Cons

• It cannot be improved without opening an account, and the model's own vendor advises against opening one for this purpose.
• Applying costs an inquiry, and a cluster of new accounts can read as financial distress to a creditor whether or not it is.
• It is not a universal scoring category. VantageScore 4.0 merges it with length of credit history into a single factor, so advice framed around "the five factors" describes one model family.
• The published weight describes the general population, and Fair Isaac says it may differ for different credit profiles, so no one can tell an individual what the factor is worth on their file.
• Mix does not stand alone: the payment history on those account types is read alongside it, and payment history is weighted far more heavily.