No credit score? That'll be $900 more.
The story so far You found an apartment closer to the bike shop. Rent is $900 a month. The landlord runs a credit check and finds no credit history, because you've only ever used a debit card. So you have to pay an extra $900 deposit up front. Your cousin Ana applies for the same kind of apartment. Her score is 760, so she pays no extra deposit. This lesson shows what a credit score is, what moves it, and how to build one from zero.
A credit score is a three-digit number, usually 300 to 850, that tells lenders how likely you are to pay back what you borrow.
Landlords, lenders, card companies and some employers check it. A higher score means lower interest rates and smaller deposits.
Pay every bill on time, use only a small part of your card limits, and give your accounts time to age.
Credit bureaus collect your history. Credit analysts and loan officers read it to approve loans and set rates. Data scientists at FICO build the score models.
What you're looking at: a credit score gauge. The colors run from poor (left) to exceptional (right). The needle points at 715, the average FICO score in the U.S. (FICO, 2025).
Your report, and the score built from it.
Lenders can't know you, so they look at how you've handled borrowing before. That record is your credit report. Your score is a quick summary of it.
The report and the three bureaus
Your credit report lists your cards and loans, their balances, and every payment: on time or late. Three companies keep these reports: Equifax, Experian and TransUnion. They're called credit bureaus. You can see all three reports for free every week at AnnualCreditReport.com. A debit card doesn't build a report, because you're spending your own money, not borrowing.
- Your report
- Only a debit card and a checking account, so the bureaus have nothing to report. That's why the landlord found no history.
- Ana's report
- A credit card she's paid on time for 4 years. That record is what earns her the 760.
The score: 300 to 850
The most used score is the FICO score, from 300 to 850. Higher is better. A newer score, VantageScore, uses the same range. You need about 6 months of history before a FICO score exists. Here's how lenders usually read it:
- 300 to 579 Poor
- 580 to 669 Fair
- 670 to 739 Good
- 740 to 799 Very good
- 800 to 850 Exceptional
- Ana, 760
- Falls in 740 to 799: very good. Landlords and lenders give her their best terms.
- You
- No history yet, so no score at all. That's different from a bad score, and easier to fix.
The five things that move it
FICO keeps its exact formula secret, but it publishes how much each part counts. Tap a part to see what it means.
What you're looking at: the share of a FICO score that comes from each part, as published by FICO. The longer the block, the more it counts. Together they make 100%.
- Payment history, 35%
- Ana's 4 years of on-time payments are the biggest reason her score is 760.
Credit utilization: how much of your limit you use
The second biggest part, amounts owed, mostly comes down to credit utilization: the balance on your cards divided by your total limit. Under 30% is fine. Under 10% is best. It's measured from the balance on your statement, so even if you pay in full later, a big statement balance can count against you that month.
- $300 on a $1,000 limit
- $300$1,000 = 0.30 = 30%, right at the line.
- $40 on a $500 limit
- $40$500 = 0.08 = 8%: under 10%, the best zone.
What you're looking at: your utilization on one card. The bar fills with the share of the limit you're using. The marks show 10% and 30%, the two lines lenders watch.
What hurts, and for how long
A payment that's 30 or more days late gets reported and stays on your report for 7 years, though it hurts less as it gets older. Applying for new credit causes a hard inquiry, which can drop your score a few points and stays on your report for 2 years. Checking your own score is a soft inquiry and never hurts it. Some things aren't in your score at all: your income, your savings, and your debit card.
- Checking your score
- You look in your bank app every week: soft inquiry, no change.
- A missed payment
- If a $40 card payment goes 30 days late, that mark stays for 7 years.
Building credit from zero, and what it's worth
With no history, start small. A secured credit card asks for a deposit, often $200 to $500, that becomes your limit. Put one small bill on it and set autopay for the full balance. Other options: become an authorized user on a family member's card, or take a small credit-builder loan from a credit union. A good score pays off when you borrow: lenders charge lower rates to higher scores.
- Your plan
- A secured card with a $500 deposit. Your $40 phone bill goes on it, paid in full by autopay: 8% utilization, on time every month. After about 6 months you'll have a first score.
- Later, a car loan
- Borrow $20,000 for 5 years. Say a good score gets 6% and a fair score gets 12%. The payments are $386.66 and $444.89 a month: 60 × ($444.89 − $386.66) = 60 × $58.23 = $3,493.80 more for the lower score.
Two minutes. Just listen.
Tap any line to jump to it.
Score moves.
Eight things happen to someone with a credit card. For each one, decide: does it help their credit score, hurt it, or do nothing? One try each.
What you're looking at: made-up moments in one person's money life. Each answer is about the FICO score, using the five parts from this lesson.
The logic, step by step.
Four checks tell you where a score stands and what to fix first.
Step 1: Read the band
- Ana
- 760 is very good.
Step 2: Find the utilization
- Two cards
- $200 on a $1,000 card and $400 on a $1,000 card: $200 + $400$1,000 + $1,000 = $600$2,000 = 30%.
Step 3: Find the target balance
- $2,000 of limits
- $2,000 × 0.10 = $200. Paying the balance from $600 down to $200 takes utilization from 30% to 10%.
Step 4: Price the score
- $20,000 car loan
- 60 × ($444.89 − $386.66) = $3,493.80.
Worked example: from no score to a first score
- Month 0. You open a secured card with a $500 deposit, so your limit is $500.
- Each month. Your $40 phone bill goes on the card. Utilization: $40$500 = 8%.
- Each due date. Autopay pays the full $40, so you pay no interest and every payment is on time.
- Month 6. The bureaus have 6 months of on-time history, so a FICO score appears.
- Next apartment. With a good score, no extra deposit: that's the $900 you keep.
Reef fish check the track record.
On coral reefs, small cleaner fish eat parasites off bigger fish. But some cleaners cheat and bite off healthy skin instead. Scientists found that reef fish watch how a cleaner treats other fish, and choose the one with the good record. Cleaners being watched behave better, because their reputation brings them customers.
What you're looking at: an illustration, not data. Two cleaner fish (small, striped) at their spots on a reef. Big fish wait at the one known for cleaning well and skip the one known for biting.
Why this sticks. Lenders are the big fish. They can't know you, so they check your record first. Every on-time payment is a good cleaning someone saw. Build the record, and the best offers line up for you.
The page you'd copy down.
- Credit report = your borrowing record. Kept by 3 bureaus: Equifax, Experian, TransUnion. Free weekly at AnnualCreditReport.com.
- FICO score: 300 to 850. Average 715. 670+ good, 740+ very good, 800+ exceptional. Needs about 6 months of history.
- Five parts: payment history 35%, amounts owed 30%, length of history 15%, new credit 10%, credit mix 10%.
- Utilization = balancelimit. Keep it under 30%, best under 10%. $40 on $500 = 8%.
- 30+ days late stays 7 years. Hard inquiry (applying) stays 2 years. Soft inquiry (checking your own) never hurts.
- Not in the score: income, savings, debit cards.
- Start from zero: secured card, small bill, autopay in full. Or authorized user, or a credit-builder loan.
- Score = money: $20,000 car loan at 6% vs 12% for 5 years costs $3,493.80 more.
Fill in the blanks
Grab a friend or a study group.
Myth or fact?
Take turns saying something people believe about credit, like "checking my score lowers it" or "a higher salary raises it." The others call myth or fact and explain why.
Utilization race
One person names a balance and a limit. First to say the utilization as a percent, and whether it's under 10% or 30%, wins the round.
Ask someone older
Ask a parent or relative how they built their first credit. What would they do differently? Compare it to the secured-card plan in this lesson.
Just you and your money.
These stay on this device. Nobody else sees them.
Exam-style questions.
Written the way a college exam would ask them. Each right answer on the first try is worth 10 xp.
On the job: you're the loan officer
A customer, Jordan, wants a car loan in a few months and asks how to get a better rate. Here's Jordan's credit report:
- FICO score: 680.
- One credit card with a $2,000 limit and a $1,400 balance.
- One payment that was 30 days late, 3 years ago. Every other payment was on time.
- Jordan plans to apply for two store cards this month to "build more credit."
Your task: tell Jordan which band 680 falls in, what Jordan's utilization is, what balance to aim for, and whether the store cards are a good idea right before a car loan.
See a model answer
The band: 680 is in 670 to 739, good, but not yet very good.
Utilization: $1,400$2,000 = 70%. That's well over 30%, and it's the fastest thing to fix.
Target: $2,000 × 0.30 = $600 to get under 30%, and $2,000 × 0.10 = $200 for the best zone. Paying down to $200 means paying off $1,200 before the statement closes.
The late payment: it stays on the report for 7 years, about 4 more, but it counts less every year. Keep every payment on time from here.
The store cards: skip them for now. Two applications mean two hard inquiries and two new accounts right before the loan, which can lower the score.
From saving to borrowing well.
What you're looking at: a map of where this lesson fits in the course. Read it left to right: the lesson that comes before, this lesson in the middle, and the lessons it connects to.
- Before · Unit 3Make your savings earn more
- You are hereYour credit score
- Next · Unit 4Credit cards
- Later · Unit 4Loans
- Later · Unit 9Interest rates and the Fed