Credit utilisation ratio: The lesser-known number that drives your credit score

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Most people think their credit score rises and falls mainly on whether they paid on time. That matters a lot, but there is another number that often does damage in the background even when you never miss a due date: credit utilisation. In simple terms, it is how much of your available credit card limit you are using at a point in time. Credit bureaus and scoring models treat this as a strong signal of risk because high utilisation can look like you are depending heavily on borrowed money. TransUnion CIBIL, for example, explicitly notes that high credit utilisation can negatively impact your score because it suggests over-reliance on credit.

How the ratio is calculated

The calculation is straightforward: divide your total outstanding balances on revolving credit by your total credit limits, and you get a percentage. If you have a combined limit of Rs 5 lakh across cards and your outstanding balance is Rs 1.5 lakh, your utilisation is 30 percent. Most scoring systems look at revolving utilisation as part of what is often called the “amounts owed” or “credit usage” bucket.

Why it affects your score more than you expect

Utilisation moves quickly, unlike many other score inputs. Your repayment history builds slowly, but utilisation can spike in one billing cycle and be reported before you have a chance to “fix” it. A lower utilisation rate is generally better for credit scores, though the exact impact depends on your overall profile and scoring model. In other words, two people can have the same utilisation but see different score movements depending on their history and other credit behaviour.

What “good” utilisation looks like in real life

You will often hear the 30 percent rule because it is a useful, easy benchmark. TransUnion CIBIL itself has published consumer guidance suggesting that keeping overall spend to around 30 percent of your limit is considered healthy. If you are preparing for a major loan, such as a home loan, it can be worth aiming lower for a few months because very low utilisation tends to read as “not stretched.”

The timing trap that catches people

A common surprise is that you can pay your card in full every month and still show high utilisation if you run up the balance and only pay after the statement is generated. Many lenders and bureaus see the balance as of the reporting snapshot, not your intent. That is why people who are otherwise disciplined sometimes see a temporary score dip right before a loan application. The practical fix is to pay down large balances before the statement date, not just before the due date.

How to reduce utilisation without playing games

The cleanest strategy is boring: keep balances lower relative to limits. If you have multiple cards, spreading spending can help because both overall utilisation and per-card utilisation can matter in some models. Asking for a credit limit increase can also lower utilisation, but only if you do not treat the higher limit as permission to spend more. If you rarely use an old card, think twice before closing it, because closing cards reduces your total available limit and can push your utilisation up overnight.

The bottom line

Credit utilisation is powerful because it is a live indicator of how hard you are leaning on credit at any moment. If you keep it comfortably low, especially in the months before applying for a loan, you give your credit score the best chance to reflect the good work you are already doing on repayments.