Utilization applies specifically to revolving accounts — credit cards and lines of credit — and is calculated as the current balance divided by the credit limit, expressed as a percentage. A card with a $10,000 limit and a $6,000 balance is at 60% utilization; the same card at a $500 balance is at 5%. Utilization is calculated per account and can also be aggregated across all of a borrower's revolving accounts to give an overall picture.
Installment accounts do not generate a utilization figure in the same sense — a car loan paid down from $30,000 to $15,000 is simply a loan that is half repaid, not a loan 'utilizing' 50% of some available limit, since there is no revolving limit to measure against.
A borrower can have a flawless payment history — every account rated 1, never a day late — and still be carrying utilization high enough to raise concern, because utilization is read as a signal of financial pressure independent of whether payments have actually been missed yet. A borrower running most of their available credit close to the limit every month is generally considered to be under more strain than one using a small fraction of what is available, even if both have paid on time.
This distinction is worth explaining to clients directly: paying the minimum on time every month does not neutralize the effect of running a card close to its limit, because utilization and payment history are measuring two different things.
High utilization affects a file in two separate places, which is why it deserves more attention than a single line item might suggest. First, it is a meaningful factor in the credit score itself, and can suppress a score even with a perfect payment record. Second, and separately, a high balance on a revolving account increases the required-payment or percentage-of-balance figure that feeds directly into TDS, as covered in Course 05 — so the same high balance can simultaneously lower the score and tighten the debt-service ratio.
A borrower who pays down a maxed-out line of credit in the weeks before applying can improve both numbers at once, which is exactly why this is one of the highest-leverage pieces of advice a broker can give early in the process, well before the file reaches submission.
A utilization scrub is simply the practice of reviewing every revolving account on a client's file before application and identifying any that are running unnecessarily high, then advising the client to pay them down — even temporarily, if the balance was going to be paid off soon anyway — before the credit is pulled for the application. Authorized-user accounts and secured cards are worth checking specifically here too, since an authorized-user balance the client does not control can still affect utilization on their own file.
This is not about hiding debt — the debt still exists and still shows on the file's balance history — it is about presenting the file at the moment of application in its most accurate, least alarming light, particularly when the high balance was temporary and unrepresentative of the borrower's typical position.
A borrower has never missed a payment on their credit card but consistently carries a balance near the card's limit. Why might this still concern an underwriter?
Utilization is treated as a distinct signal from payment history — it can suppress a score and tighten a debt-service ratio even on a file with flawless payment timing, because it speaks to how close to the edge a borrower is running rather than whether they have crossed it yet. Treating a perfect payment record as the only relevant fact ignores this entirely. Utilization is specifically a revolving-credit concept, the reverse of what one distractor suggests, and it matters on its own — it does not require an accompanying missed payment to be a legitimate concern.
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