How a Credit Score Is Built and Why Paying on Time Beats Every Trick

There is a three-digit number that follows you around America. It is not in the Constitution. It was not voted on. Nobody ever asked you to sign up for it. And yet it quietly decides how much you pay for a car loan, whether a landlord returns your call and, in some cases, how large a deposit the power company wants.

Most people treat that number like the weather: something that happens to them. They hear a friend swear that opening a certain card raised it forty points, or that closing another one wrecked it, and they spend more energy on rumors than on the number itself. I want to take the mystery out of it. A credit score is not a moral judgment, and it is not witchcraft. It is a summary of a few behaviors, and once you know which behaviors, you will know why the dull advice is the best advice.

One word of caution up front. This is general information about how the system works, not financial advice for your situation. Your own report and your own lender's terms are what count.

What a credit report is, and who keeps it

Start with the raw material. A credit report is a file that records your borrowing history: the accounts you have opened, the limits and balances on them, whether you paid on time, and any collection accounts or public records. It is kept by private companies called credit bureaus, and there are three big ones that matter to most families: Equifax, Experian and TransUnion.

Those companies are not government agencies. Lenders report to them, voluntarily and for their own reasons, and they sell the resulting reports and scores to other lenders. Because each lender chooses which bureaus to report to, your three reports can differ slightly. That is normal.

A credit score is a number computed from the report by a formula. The best known is the FICO score, created by the Fair Isaac Corporation, which ranges from 300 to 850. A second scoring family, VantageScore, uses a similar range. Different lenders use different versions of the formulas, which is why the score on a free app can differ from the one your mortgage lender pulls. The details of the formulas are proprietary, but the broad outline is public.

The five ingredients

FICO publishes the general weight it gives to five categories. These are approximate and apply to a typical report, but they are the best map we have.

Read that table slowly. Two lines, payment history and amounts owed, add up to 65 percent of the score. The other three share the remaining 35 percent. If you want to know where to spend your effort, you have your answer.

One: payment history

This is the largest piece, and it is the most straightforward. Did you pay your bills when they were due? A payment that is thirty days late or more can be reported to the bureaus and can stay on the report for up to seven years, with the damage fading over time. A single late payment on an otherwise clean report can cost a lot, and the more recent, the more serious. Collection accounts, charge-offs and bankruptcies sit in this category, too. A bankruptcy can remain on a report for up to ten years.

The lesson is dull and it is true: the single most powerful thing you can do for your score is pay every bill on time, every month. Set up automatic payments for at least the minimum, so that a busy week can never produce a late mark. Then pay the rest on your own schedule.

Two: amounts owed, and the utilization ratio

The second factor is how much of your available credit you are using. The shorthand is utilization: your balances divided by your credit limits.

Here is a worked example, with hypothetical numbers. Suppose you have two cards. Card A has a $5,000 limit and a $1,500 balance. Card B has a $3,000 limit and a $300 balance. Your total limit is $8,000 and your total balance is $1,800. Your overall utilization is $1,800 divided by $8,000, which is 22.5 percent. Card A on its own is at 30 percent ($1,500 divided by $5,000), and Card B is at 10 percent ($300 divided by $3,000). Scoring models generally look at both the overall figure and the figures for each card.

The commonly given guidance is that lower is better, and that staying well below 30 percent is a sensible target. There is no magic cliff at 30; the general pattern is that the less of your available credit you use, the better the score tends to look. Someone who uses 5 percent will usually look safer to the formula than someone at 90.

One mechanical detail deserves attention. Card issuers typically report your balance to the bureaus on the statement closing date, not on the due date. So if you charge $1,500 and pay it in full on the due date, the bureau may still have seen the $1,500 balance on the day the statement closed. If you want the reported balance to be lower, you can make a payment before the statement closes. That is not a trick; it is just timing. It does not change the fact that you owe the money. It changes the picture the bureau gets.

Three: length of history

This one rewards age. The formula looks at the age of your oldest account, the age of your newest and the average age of all of them. A person who opened a first card at eighteen and never closed it has a long history. A person who opened three accounts last year has a short one. There is nothing to do about this factor except to avoid unnecessary churn. Time is the only ingredient, and time is free.

Four: new credit and the inquiry

When you apply for credit, the lender looks at your report. That look is called an inquiry, and there are two kinds.

• A hard inquiry happens when you apply for a loan or card and the lender checks your report to decide. It can lower your score by a small amount, and it stays on your report for about two years, though its effect on the score generally fades sooner.
• A soft inquiry happens when you check your own report, when a lender pre-screens you, or when an existing creditor reviews your account. Soft inquiries do not affect your score.

If you are shopping for a mortgage or a car loan, scoring models generally treat several inquiries of the same type within a short window as a single inquiry, since the formula assumes you are comparing offers rather than piling on debt. The length of that window varies by the model, so ask your lender, or keep your shopping within a couple of weeks. Opening many new cards in a short time, on the other hand, can look like financial strain.

Five: credit mix

A mix of account types, such as a credit card and an installment loan like a car loan or mortgage, can help a little. It is only ten percent, and it is not a reason to borrow money you do not need. Never take out a loan to improve your credit mix. That is paying interest to polish a number.

Your rights under the Fair Credit Reporting Act

Now the law, which is on your side more than most people realize. Congress passed the Fair Credit Reporting Act in 1970. It regulates how consumer reporting agencies collect and share information, and it gives you rights. In general terms:

1. You may get your report. You are entitled to a free copy of your credit report from each of the three major bureaus on a regular basis, and the official channel is the website the bureaus run for that purpose, AnnualCreditReport.com. Check the site for how often you can request reports, since the bureaus have extended free access beyond the annual minimum the law requires. Be wary of imitation sites that charge fees.
2. You may dispute errors. If something on your report is wrong, you can dispute it with the bureau, in writing and with documents. The bureau is generally required to investigate, typically within thirty days, and to correct or delete information that cannot be verified.
3. You must be told when credit is denied because of your report. A lender that takes an adverse action based on information in a report must tell you, and tell you which agency supplied it, so that you can get your free copy and check it.
4. Old negative information ages off. In general, most negative items drop off after seven years, and bankruptcies after up to ten, as noted above.

The practical advice is to pull your reports at least once a year and read them like a bank statement. Mistakes happen: an account that is not yours, a payment marked late that was on time, a balance that was paid. Errors are not rare enough to ignore, and a dispute costs nothing but a stamp. If you find a mistake, dispute it in writing, keep copies and follow up. If you have a serious dispute, a qualified professional or a consumer protection agency can help.

Why closing old cards can hurt

Here is a piece of folk wisdom that is half right. People often think that cleaning up their wallet by closing an old card is a responsible move. It can backfire, for two reasons.

First, closing a card removes its limit from your total available credit, which can raise your utilization. Return to the example above. Suppose you pay off Card B's $300 and close the card. Your total balance falls to $1,500, but your total limit drops from $8,000 to $5,000, so your utilization becomes $1,500 divided by $5,000, or 30 percent, up from 22.5 percent, even though you owe less money than before. The denominator shrank faster than the numerator. Charge the full $1,800 to the remaining card and the ratio hits 36 percent ($1,800 divided by $5,000). The math is not complicated, and it is easy to miss, which is why the person who tidies his wallet can accidentally pay for the privilege.

Second, the account's age. A closed account in good standing generally continues to appear on your report for a number of years, but eventually it falls off, and with it goes some of your length of history.

None of this means you should keep a card with an annual fee you do not want. It means: think before you close the oldest, no-fee card in the drawer. Use it for a small recurring charge, set it to autopay, and let it age gracefully.

The tricks, and why they lose

Every few months a new trick makes the rounds. Open a card, then close it. Pay in small pieces throughout the month. Add yourself as an authorized user on a stranger's account. Pay a company to "repair" your credit. Some of these do something small. None beats the basics, and a few cost you money or risk.

Here is the scoreboard in a sentence. A perfect trick that adds a few points will be dwarfed by a single missed payment. If you pay on time every month, keep your balances low relative to your limits, avoid opening accounts you do not need and leave old accounts open, you have captured most of what the formula can give you. The rest is fiddling.

Beware, too, of the companies that promise to erase accurate negative information for a fee. The law does not let anyone remove accurate, timely information from a report before its time. You can dispute errors yourself for free. Paying someone to do what you can do with a stamp is a poor deal.

Steelmanning the objection

A thoughtful skeptic will say: this system is arbitrary. Private companies with secret formulas decide who gets a loan, and the formulas punish the poor, who may have thin files simply because they have used cash. Why should a conservative defend it?

I will take that seriously, because part of it is right. The formulas are proprietary, and a person with no credit history can be locked out of the system through no fault of his own. That is a real problem, and market competition among scoring models and among lenders is the right place to look for fixes, including newer ways of counting rent and utility payments where borrowers choose to share them.

But let me answer it in three points.

1. The function of a credit score is to measure reliability, and reliability is a virtue. A lender who is asked to hand over money wants to know whether the borrower pays it back. Paying what you owe, on time, is one of the oldest moral habits in the book, and the score is a rough summary of it.
2. The inputs are things you control. The two biggest factors are paying on time and using little of your credit. Both are choices. Not many ranking systems in life can say that.
3. The alternative is worse. Without a record of behavior, lenders would fall back on guesswork, relationships and prejudice, and borrowing would be more expensive for everybody. A standardized record lets a young person with no connections earn a good name by his own conduct, and that is a rather American idea.

The Founders valued a good name and a good character, and credit is the same word as trust. For a thoughtful look at how the habit of keeping your word shows up elsewhere in a household, see Marriage and Money, Why One Household Budget Beats Two Separate Ledgers and Teaching Kids About Money, a Plan From the Piggy Bank to the First Paycheck.

A plain-language routine

If you want a routine you can keep without reading another word, here it is.

1. Pull your reports from the official site and read all three.
2. Dispute anything wrong, in writing, with copies.
3. Put every bill on autopay for at least the minimum, and check the account monthly.
4. Pay cards in full when you can, and keep balances low relative to limits.
5. Keep your oldest accounts open unless there is a good reason to close them.
6. Apply only for credit you need, and do your rate shopping in a short window.
7. Build the buffer that keeps you from missing a payment in the first place; Why the Emergency Fund Comes Before Every Other Money Goal You Have explains why.

If you carry debt, the order of attack matters more than any trick, and Debt Snowball or Debt Avalanche? Two Payoff Plans Run on the Same Four Debts walks through the two major payoff plans. And if you have heard that carrying a balance helps your score, that deserves its own correction, in Carrying a Balance Builds Credit and Six Other Borrowing Myths, Tested.

The case in brief

1. A credit score is a summary of your borrowing behavior computed from reports kept by Equifax, Experian and TransUnion, and the FICO model weights payment history at about 35 percent and amounts owed at about 30 percent.
2. Paying on time is the largest factor and the easiest to control, and utilization, your balances divided by your limits, is the second, so a family that pays on time and uses little of its credit has captured most of what the formula can give.
3. Hard inquiries cost a little and soft ones nothing, new accounts and credit mix count for about ten percent each, and closing an old card can raise your utilization and shorten your history.
4. Under the Fair Credit Reporting Act of 1970, you may obtain your reports, dispute errors, and be told when credit is denied because of a report, so checking yours yearly is cheap insurance.
5. No trick beats the basics, and any firm that charges to remove accurate information is selling something the law does not allow.

What you can do: this week, pull your three credit reports from AnnualCreditReport.com and dispute in writing any entry that is wrong.