What a Credit Score Actually Prices
A credit score is a lender's estimate of how likely you are to repay, expressed as a number. Its only real effect is on the interest rate you are offered, which turns it into money on every loan, card and mortgage you hold.
Scoring systems differ by country and by bureau, and the specific models are proprietary. What follows describes the components common across them rather than any one provider’s formula.
How it works
A credit score is a lender’s estimate of repayment risk. It exists so that a decision that would otherwise take an underwriter can be made in seconds, and it is built entirely from your history of borrowing and repaying.
It has exactly one effect: the price you are offered. A higher score does not make you a better person or a better saver. It makes borrowing cheaper.
And an interest rate is money. The debt payoff tables computed for this site show what rate does: on $17,000 of debt, the same balance costs $7,311 in interest at one payment level and $1,577 at another. Rate and payment both move that figure, and the score moves the rate.
What the components actually are
Payment history is the largest single factor in essentially every model. Paying on time, every time, does more than anything else on this list, and a single missed payment can undo a long stretch of good behaviour.
Utilisation is the fastest lever. It measures balances against limits, it is recalculated when balances are reported, and unlike history it can improve within a single month.
Which produces a small piece of practical advice: paying a card down before the statement date rather than after it changes the balance that gets reported, and therefore the utilisation the model sees.
Account age only improves with time. Nothing can be done to accelerate it, which makes it the one component where inaction is the correct strategy.
Checking your own file does not affect it. A lender’s hard enquiry when you apply for credit can have a small, temporary effect; looking at your own report has none, and the belief that it does stops people from finding errors.
In practice: what it is worth
The mortgage is where the money is. A fraction of a percentage point on a thirty-year loan is a larger sum than almost anything else discussed in this section, and it is decided by a number that takes a few years of ordinary behaviour to build.
Paying down a card does two things at once. It lowers utilisation, which improves the score, and it removes interest at the card rate. That is the only action on this page with two independent payoffs.
The practical routine is short. Pay everything on time by automating the minimum, keep balances well below the limits, leave old accounts open, apply for new credit sparingly, and check the report once a year for errors. That is essentially the whole method.
What a score is not
It is not a measure of wealth. Someone with no debt and no borrowing history can have a thin file and a mediocre score, while a heavily indebted person who pays on time can have an excellent one.
It is not one number. Different bureaus and different models produce different scores from overlapping data, and the one a lender uses may not be the one you can see.
It is not permanent. Negative marks age out on a schedule, and the effect of an old problem fades whether or not anything is done about it.
And it is not the goal. The goal is cheaper borrowing. Optimising the score itself, beyond the point where it changes the rate offered, achieves nothing.
When it fails
The most common self-inflicted failure is closing an old card. It shortens average account age and removes its limit from the utilisation calculation, so a tidy decision lowers the score twice over.
The second is a missed payment on a small balance. The amount is irrelevant to the model; the missed payment is what registers, and a forgotten $20 bill can cost more than the balance many times over.
A third is applying for several products at once. Multiple applications in a short window read as a change in circumstances, which is what the model is built to detect.
A fourth is not reading the report. Errors are common, they persist until disputed, and nobody else has an incentive to find them.
And a fifth is carrying a balance in the belief that it helps. Using a card and clearing it in full reports activity without interest; carrying the balance adds cost and does not improve the score.
There is also a failure that looks like success. A score can be pushed up by opening accounts and spreading balances across them, which raises the total limit and lowers utilisation without any change in what is owed. The model improves, the debt does not, and the underlying position is no better than it was.
Which is why the score is worth watching and not worth optimising. Past the level that gets the best available rate on the borrowing you actually need, further points buy nothing at all. The behaviours that produce a good score — paying on time, borrowing modestly, leaving accounts alone — are the same ones that produce a decent financial position, and doing them for the position rather than for the number is the version that keeps working.
The original data
The corpus of 24,971 videos measured for this site contains no standalone coverage of credit scores. It sits entirely outside the trading content and squarely inside the set of things that determine how much money is available to trade with in the first place.
The measured figure that applies is the interest one. From the debt tables computed for this site, the same $17,000 costs between $1,577 and $7,311 in interest depending on how fast it is cleared. A score changes the rate underneath those numbers, which is why it belongs in a section about money rather than in a section about credit.
Related
Paying off debt is the action that moves the score and the interest at once. Budgeting is where the payment comes from. And net worth is the figure all of this eventually shows up in.
I closed an old card I never used because it felt tidy, and my score dropped for reasons that had nothing to do with anything I had done wrong — I had shortened my average account age and cut my total limit in one action.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.