The Numbers That Matter: 10%, 30%, 50%
The specific thresholds where scores tend to shift
In this lesson you will learn to
- Name the utilization bands and what usually happens to a score in each.
- Explain why "under 30%" is the line for avoiding damage, not the target.
- Set a utilization target that fits your next goal, such as a mortgage.
- Decide which card to pay down first when several carry balances.
FICO does not publish exact score tables. But researchers and credit experts have mapped rough utilization thresholds where scores tend to shift. Knowing these bands lets you set specific targets instead of guessing.
Utilization Impact Bands
- 0-9%: Best range, top-tier score contribution. A card reporting $0 is fine. Some say 0% hurts you; there is no evidence for that as long as your cards show some activity.
- 10-29%: Good. Solid contribution, small penalty at most.
- 30-49%: Moderate impact. Scores start to sag, especially above 30%.
- 50-74%: Significant impact. Your score takes a clear hit in this range.
- 75-89%: Serious damage. Lenders see this range as a strong warning sign.
- 90-100%: Maximum damage. This level on any single card is a serious red flag.
Try it: move the balance and limit sliders and watch the needle change bands.
Moderate impact. Scores start to sag, especially above 30%.
Examples from the lessons
Notice that the band follows the ratio, not the dollars. The same $1,500 is 30% of a $5,000 limit and 10% of a $15,000 limit. FICO checks each card this way and the total too.
Illustrative bands. FICO does not publish exact tables.
Why 30% Became the "Magic Number"
You have probably heard 'keep utilization under 30%.' It became standard advice because 30% is roughly where FICO's model starts to penalize balances harder. What the advice often leaves out: the best scores come well below 30%, ideally under 10%. If you plan to apply for a mortgage in the next 6 months, 30% is not your goal. Under 10% is. Treat 30% as the line that keeps you out of serious damage, not the target to aim for.
Quick check
You keep hearing 'stay under 30%.' If you plan to apply for a mortgage in six months, what target should you aim for instead?
Real-World Examples
Real-World Example
Derek's tax refund
The Situation
Derek has two cards with $15,000 in combined limits and $7,200 in balances, which is 48% utilization. He gets a $4,000 tax refund.
What Happened
He puts the whole refund on the cards. His balances fall to $3,200 and his utilization to 21%. His score rises roughly 40-50 points over the next 30-day reporting cycle. From there he works toward 10% over the following months.
Key Takeaway
A partial paydown can create real, measurable gains within one billing cycle. You do not have to pay off everything. Crossing a threshold is what counts.
Derek's utilization, one refund later
| Category | Utilization |
|---|---|
| Before the refund | 48% |
| After the refund | 21% |
| Target for the months after | 10% |
Avalanche, Snowball, or Score First?
With balances on several cards, pick an order on purpose. The Avalanche Method pays the highest interest rate first and saves the most money. The Snowball Method pays the smallest balance first and gives you quick wins. For your score, put any card above 50% utilization at the front of the line and get it under that mark. That is where the gains tend to be biggest.
Three ways to order a paydown
| Method | Pay first | What it gives you |
|---|---|---|
| Avalanche | The highest interest rate | The most money saved |
| Snowball | The smallest balance | Quick wins that keep you going |
| Score first | Any card above 50% of its limit | The biggest score gains, usually |
Quick check
One of your cards sits at 55% utilization and another at 25%. For your score, which one do you pay down first?
What to remember
- Under 10% is best, 10-29% is good, 30% and up starts to cost you, and 50% and up does real damage.
- 30% is the line for avoiding damage, not the target. Aim under 10% before a big application.
- One card reporting $0 is fine. Just keep at least one card showing a small balance so your file shows activity.
- Crossing into a lower band helps even if you still owe something.
- For your score, pay any card over 50% down first.
Do this today
Take the percentages you wrote down in Lesson 1, or work them out now: balance divided by limit for each card. Next to each one, write the band it falls in. Then pick one card and write a target for it. For example: 'out of the 50% zone by the next statement' or 'under 10% before my application.' That is your first concrete goal for this module.
Nice work
You can now put real numbers on utilization: which bands cost points, why 30% is a safety line and not the goal, and which card to pay first. That turns a vague rule into a plan you can act on. Next lesson: the fastest moves for pulling your ratio down before the next report.
Write the single step you will take from this lesson. It saves to My plan on your dashboard.