Credit utilization: what the 30 percent rule really means

As a scoring rule, the 30 percent rule is a myth: no FICO or VantageScore model has a cutoff at 30 percent where your score suddenly drops. Utilization works on a gradient. Lower is better across the whole range, and the people with the highest scores tend to keep it in single digits. The 30 percent figure survives as a rough rule of thumb for avoiding real damage, not as a target.

Two other facts matter more than the threshold. Scores read the balance your issuer reports, which is usually the statement balance, not what you owe after paying. And in most scores in use today, utilization has no memory: last month’s high balance stops counting as soon as a lower one is reported.

What utilization measures

It is your revolving balances divided by your revolving limits, calculated across all your cards and on each card separately. One card at $2,000 of a $10,000 limit is 20 percent. FICO counts it inside “amounts owed,” the category that carries 30 percent of a FICO score.

• Authorized user cards count. FICO includes accounts you are an authorized user on.
• Charge cards usually do not. FICO says that if the issuer reports a charge card as an open account rather than a revolving one, it is generally left out of the revolving utilization calculation.
• Business cards depend on the issuer. Some report to your personal file, some only if you default; see whether your business card is on your personal report.
• Installment loans are separate. A car loan’s balance is not part of card utilization.

Why paying in full can still show high utilization

Most issuers report once a month, around the statement closing date, and they report the statement balance. Say you have a $5,000 limit, charge $2,500 during the month and pay it all by the due date. You pay no interest and are never late, but the bureaus saw a $2,500 balance: 50 percent utilization for that month.

For a score that is not being used for anything, that does not matter; the next report replaces it. It matters in the month a lender pulls your file.

A calendar example with three cards

Here is a hypothetical setup, a month or two before a mortgage application:

Now pay each card down to $50 two or three business days before its closing date: about $2,350 to Card A by the 1st, $1,150 to Card B by the 10th, $550 to Card C by the 20th. Each statement closes at $50. Reported utilization falls to 0.6, 1.3 and 1.7 percent per card and 1 percent overall ($150 of $15,000). Then pay each $50 balance by its due date, as usual.

Leave the payments a little time to post; a payment made the day the statement closes can miss the cutoff. And keep a small balance reporting rather than paying everything to zero before the statement, if you want the card to show as in use: the $50 statement balance still costs no interest when you pay it in full.

Utilization has no memory, mostly

FICO Score 8, the most widely used version, reads the most recently reported balance. If last month’s statements were high and this month’s are low, this month is what counts. That is why utilization is the fastest lever on your score and why it only needs active management in the month or two before you apply.

The exception is trended data. VantageScore 4.0 and FICO 10T look at balances over roughly the past 24 months, so a pattern of rising balances counts against you and steady paydown counts in your favor. With VantageScore 4.0 now accepted for mortgages sold to Fannie Mae and Freddie Mac, trends matter for more borrowers than they used to. The calendar trick still lowers the latest data point in those models; it does not erase the trend.

Utilization also changes when your limits change. Closing a card removes its limit (see what closing a card really costs), and a higher limit lowers the ratio if your spending stays the same (see how to get a higher limit without a hard inquiry).

When high utilization is just debt

If the balance stays from month to month, timing tricks do nothing useful: the issue is the interest. This is the Federal Reserve’s average APR on credit card accounts that were charged interest, at commercial banks:

Ignore the 30 percent rule and build a payoff plan. As the balances fall, utilization falls with them and the score follows. The calculator below shows how long a balance takes to clear at a given payment:

If you have several cards, avalanche or snowball helps you choose the order. A debt consolidation loan can lower the interest and move the debt from revolving to installment, which also lowers card utilization, as long as you do not run the cards back up.

Secured cards and small limits

Low limits make utilization swing hard. On a secured card with a $300 limit, a $90 statement balance is 30 percent and $150 is 50 percent. If that is your only card, put one small recurring bill on it and pay it before the statement closes. You can see the balances your issuers reported on your free reports at AnnualCreditReport.com.