Lesson 10 of 25 · 7 min

The parts of a credit score, mechanically

A credit score is five mechanical ingredients, and one late changes only the payment-history component.

A widely reported credit score is a single number built from five mechanical ingredients: payment history, amounts owed (utilization, lesson 9's ratio), length of history, mix of credit, and recent applications. The number is a lender's haircut on unsecured capacity. Track 1 lesson 4 is a haircut on collateral that changes what can be borrowed against the same asset. A score is that haircut pointed at a person rather than at a pledged portfolio.

An invented illustration at Wick & Pell Cards. The file is otherwise clean. One 30-day late posts. That is a category change in the payment-history component. Amounts owed did not move that month. Length of history did not move. Mix did not move. Recent applications did not move. Four of the five ingredients are unchanged. The printed score can still move, because payment history is one of the ingredients, and it is the one that changed.

Reporting rules vary, and a reader's own file belongs with a qualified professional. Nothing in this lesson is a current score, a bureau table, or a method for raising a number. The mechanism is the split: five inputs, one printed output, and a single late is a change in one input. Utilization can move the amounts-owed input without any late posting, which is why lesson 9's ratio sits inside this machine as a component, not as a tip.

The five ingredients, as mechanics, not as advice:

Payment history — whether scheduled amounts arrived by their due dates, and at what delinquency bucket.
Amounts owed — utilization and related balances; lesson 9's ratio lives here.
Length of history — how long the file has been open.
Mix and recent applications — kinds of lines on the file, and new look-ups.

One late is a category change in one component. The other four can sit still that month. Reporting rules vary; a reader's own file belongs with a qualified professional.

Key terms

Payment history: The component that records whether amounts arrived by their due dates. A 30-day late is a category change here.
Amounts owed: The component that includes utilization. Lesson 9's ratio, not the dollar balance alone.
Haircut on unsecured capacity: What the printed score is doing: changing what can be borrowed against the same person, the way Track 1 lesson 4 changes what can be borrowed against the same asset.

Worked example

One late, four still components

Invented Wick & Pell file. Otherwise clean. One 30-day late posts this month. Utilization, length, mix and recent applications are unchanged. Reporting rules vary.

Payment-history component: Category change
Amounts owed: Unchanged
Length of history: Unchanged
Mix: Unchanged
Recent applications: Unchanged

Five ingredients, one of them moved. The printed score is a blend; the late is not a blend. Reporting rules vary, and a reader's own file belongs with a qualified professional.

Check yourself

On an invented clean file, one 30-day late posts and utilization is unchanged. Which of the five widely reported ingredients changed that month, and what are the other four doing?

A credit score is a lender's haircut on unsecured capacity, the everyday version of Track 1 lesson 4: a number that changes what can be borrowed against the same person. Open What a haircut is, and why it exists →

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Educational only. Nothing in this lesson is investment, legal or tax advice, or a recommendation to enter into any transaction. Figures are illustrative and computed from the inputs stated in the lesson.