Same balance. Bigger limit. Better score.

Every card has a limit, the most the issuer will let you borrow on it. A credit limit increase raises that number, either because you asked or because the issuer offered one. Nothing else about the account changes: same card, same balance, same rate.

It matters because of a ratio. Your balance divided by your limit is your utilization, and it is measured on every statement, card by card and across all of them. In Figure 1, $1,200 on a $2,000 limit is 60% in use. Raise the limit to $6,000 and the same $1,200 is 20%.

There are three ways to get more credit: ask on a card you already have, accept an increase the issuer offers, or open a new card. Only the first two leave your report alone. A new card adds a hard inquiry and lowers the average age of your accounts, so an increase on a card you hold is the cheaper move.

Amounts owed is the second-largest piece of a FICO score, 30% of it, behind payment history, and utilization is most of that slice (installment balances make up the rest). Under 30% counts as good and under 10% as best; those are the two lines on every track in the app.

Unlike payment history, utilization has no memory in FICO 8, the version most card decisions use. The score uses whatever your latest statement reported. A high month is forgotten the moment a low one lands, and a bigger limit makes every month a low one without you paying a dollar more. That is what makes it the one big factor you can move this month. (The newest formulas, FICO 10T and VantageScore 4.0, also read the last two years of balances, so the habit still pays there.)

The ratio is checked on each card as well as in total. One card at 80% costs points even if the rest sit at zero, so the increase worth asking for is on the card you actually use.

Most requests never reach a person. The issuer’s own model decides in seconds from what it already knows about you, and a reviewer only steps in when the model cannot. It weighs five things:

• This card. How long it has been open, whether every payment was on time, and whether you use it and pay it down. A card that sits unused is a card they see no reason to grow.
• Your income. What you report against what you owe. It is the one number the issuer cannot see on its own, and the one most people leave stale.
• Exposure. How much credit they have already extended to you across all of their cards, measured against that income.
• Your report. The score, recent hard inquiries, and how much of your other credit is in use.
• Timing. Months since the card opened, or since the last increase or request. Most issuers want about six. Amex takes a request on a new card after 60 days, then wants six months between increases and 90 days after a no.

A request that comes back “not yet” costs nothing when it was a soft pull: nothing on your report changes, and the clock simply keeps running. A hard pull is the exception, and with most issuers it is avoidable.

• Ask online, not by phone. With most issuers, website and app requests are a soft pull and a phone request can turn into a hard one, so ask whether it will be a hard inquiry before they submit. Read the request form: the ones that may hard-pull, such as Bank of America’s and Citi’s for a large ask, say so before you submit.
• Update your income first. A raise you never reported is a raise they never counted.
• Get under 30% first. A card that is already more than half used reads as someone who needs the room, not someone who has earned it, and issuers tend to say no. Pay the card down, let a low statement report, then ask.
• Wait out the clock. Asking again early rarely changes the answer and restarts the waiting period.
• Ask for a number. Most forms take a requested limit. On a new Amex card, three times the current limit is common; elsewhere, ask for what you would actually use. A modest ask is also less likely to trip a hard inquiry where the issuer reserves one for large requests.

The issuers differ in how they take the request and what it costs you:

A lower ratio without paying more. The same spending reports as a smaller share of your credit, so the score moves on its own. Those are points you did not have to pay for.

A cushion for the big month. A flight, a repair, the holidays land under the lines instead of on top of them. A higher limit is a buffer, not a budget.

Better terms on the next thing. Lenders price a car or a home off your score, and other issuers set your starting limit with an eye on the ones you already hold.

The app keeps the clock. Link your cards and CreditMaxer tracks each issuer’s waiting period, whether they soft-pull, and when your window opens. The request lands on your calendar as a window, not a deadline, with what to say when you ask.