Credit Utilisation: One Maxed Card Can Drag You Down
$4,700 across three cards is 29% of your total limit - which sounds fine. But if $4,500 of it sits on one card with a $5,000 limit, that card is at 90%. Scoring looks at each card as well as the total, so a healthy-looking overall figure can hide the thing actually hurting you.
The figure that looks fine and is not
Three cards. $4,700 of balances against $16,000 of limits. That is 29% overall - inside the commonly quoted “under 30%” guidance, and nothing to worry about.
Except look where the money actually sits:
| Card | Balance | Limit | Using |
|---|---|---|---|
| Card A | $4,500 | $5,000 | 90% |
| Card B | $200 | $8,000 | 2.5% |
| Card C | $0 | $3,000 | 0% |
| Total | $4,700 | $16,000 | 29.4% |
One card is at 90%. Scoring looks at individual cards as well as the total, so that card is doing damage the overall figure completely hides.
This is the single most useful thing to know about utilisation, and the credit utilisation calculator shows both figures side by side for exactly this reason.
Moving the same money helps
Here is what happens if you spread the identical $3,500 across the three cards instead of stacking it on one:
| Overall | Worst single card | |
|---|---|---|
| Stacked on one card | 29.4% | 90% |
| Spread across three | 21.9% | 30% |
Same debt. Same money owed. Same interest, roughly. But the worst card drops from 90% to 30%, and the overall figure improves too.
You have not paid off a penny. You have just stopped one card looking maxed out.
Why this is the fastest lever you have
Most of what makes up a credit score moves slowly. Payment history takes years to build. The age of your accounts cannot be rushed at all.
Utilisation is different. It is recalculated from the balance your card reports each month, so it can change within one billing cycle.
That makes it the obvious thing to work on if you have a mortgage or loan application coming. Paying a card down in March can show up in April. Nothing else on a credit report moves that fast.
The targets, and the honest version
The common advice is “keep it under 30%”. That is a reasonable rule of thumb, but it is worth knowing there is no cliff edge at 30 - it is a slope. Lower is simply better.
On a $16,000 total limit:
| To get to | Balance must be | From $4,700, pay off |
|---|---|---|
| 30% | $4,800 | already there |
| 20% | $3,200 | $1,500 |
| 10% | $1,600 | $3,100 |
If you are applying for something important, aiming at 10% rather than 30% is worth the effort. If you are not, do not lose sleep over the difference.
Do not close the cards you are not using
This one catches people who are trying to be responsible.
Closing an unused card removes its limit from your total available credit. Your balances have not changed, but your utilisation just went up.
Close Card C from the example above - the one with a $3,000 limit and no balance - and your total limit drops from $16,000 to $13,000. The same $4,700 now represents 36% instead of 29%. You have made things worse by tidying up.
An unused card sitting in a drawer is quietly helping you. The main reason to close one is an annual fee you are not getting value from.
What to do
- Check each card separately, not just the total. A single card near its limit is the problem the overall figure hides.
- If one card is stacked, move some to another - same debt, better numbers.
- Time it before an application. This is the one factor that responds within weeks.
- Do not close unused cards. Their limits are working for you.
- Remember this is separate from affordability. Lenders also look at debt against income - that is the debt-to-income calculator, and it is a different test entirely.
Put your own cards into the credit utilisation calculator - it shows every card individually, flags the worst one, and works out what paying down to a target would take.
Common questions about credit utilisation
What is credit utilisation?
How much of your available credit you are using. $4,700 of balances against $16,000 of limits is 29%. It is one of the largest parts of a credit score and the fastest to change - unlike payment history, it can improve within a single billing cycle.
Does it matter which card the balance is on?
Yes, and this is what people miss. Scoring looks at each card individually as well as the total. $4,500 on a $5,000 card is 90% on that card, even if your overall figure is a comfortable 29%. Spreading the same balance across three cards drops the worst card to 30%.
What number should I aim for?
Lower is better, with no cliff edge. Under 30% is the usual advice, but there is nothing magic about it - under 10% is better still. On a $16,000 total limit, getting to 10% means paying the balance down to $1,600.
Should I close cards I do not use?
Usually not. Closing a card removes its limit from your total, which raises your utilisation on the same balances. An unused card with a limit is quietly helping you. The exception is a card with a fee you are not getting value from.
How fast does paying it down show up?
Usually within one billing cycle, because utilisation is recalculated from your reported balance each month. It is the only major scoring factor that can improve in weeks rather than years, which makes it the obvious lever before a mortgage application.