A credit score feels like a mysterious number, but the widely-used FICO model is built from five specific, weighted factors. Understanding the weighting is what makes it possible to actually improve the number, rather than guessing.
The Five Factors and Their Weight
- Payment history — 35%: Whether you’ve paid bills on time. This is the single largest factor, and even one 30-day-late payment can meaningfully lower a score, especially for someone who previously had a clean record.
- Amounts owed / credit utilization — 30%: How much of your available credit you’re using. A balance of $3,000 on a $10,000 total credit limit is a 30% utilization ratio — commonly cited as the threshold to stay under, with under 10% being ideal for a strong score.
- Length of credit history — 15%: How long your accounts have been open, including the average age of all accounts.
- Credit mix — 10%: Having a mix of account types (credit cards, an auto loan, a mortgage) rather than only one type.
- New credit — 10%: How many accounts you’ve recently opened and how many hard inquiries have hit your report.
A Real Example: Two Paths From a 650 Score
Person A has a 650 score with $4,000 owed on a $5,000 total credit limit (80% utilization) but a perfect payment history. Paying that balance down to $500 (10% utilization) — without doing anything else — commonly moves a score like this up by 40-60 points within one to two billing cycles, because utilization is heavily weighted and responds quickly once reported balances change.
Person B has a 650 score with low utilization but one missed payment from eight months ago. That single late payment can weigh on the score for up to seven years, though its impact fades over time. There’s no quick fix here — the recovery is gradual, built through consistent on-time payments going forward, since payment history is scored on an ongoing pattern rather than a single snapshot.
Common Myths
- Checking your own credit score hurts it. Checking your own report or score is a «soft inquiry» and has no effect. Only «hard inquiries» from applying for new credit have a (small, temporary) impact.
- Carrying a small balance instead of paying in full helps your score. It doesn’t — paying your statement balance in full each month is both cheaper (no interest) and just as good, if not better, for utilization than deliberately carrying a balance.
- Closing old credit cards helps your score. Closing a card reduces your total available credit (raising utilization on remaining cards) and can shorten your average account age — often lowering the score rather than helping it.
A Simple Checklist to Improve a Score Over 6 Months
- Set every account to autopay for at least the minimum, to eliminate the risk of a missed payment
- Pay down any card above 30% utilization first, prioritizing the highest-utilization card
- Avoid opening new credit accounts unless necessary
- Leave old, unused cards open (with no balance) rather than closing them
- Check your full credit report (not just the score) for errors, which are more common than most people expect