What Actually Moves Your Credit Score

You want to know which of the ten things you have heard actually matters, because you do not have time to do all ten. The honest answer is that a short list of factors carries almost all the weight, and the rest is noise you can stop worrying about tonight.

Scoring models are not identical. Different bureaus and different countries weigh things slightly differently, and a lender can also apply its own rules on top of whatever score it pulls. Treat everything below as the general shape that holds across most models, not an exact formula for any one of them.

What carries the most weight

Whether you pay on time

This is the single biggest factor almost everywhere. A payment made late, and especially one that goes to collections, tells a lender more about risk than almost anything else on your file. It is also the factor most models weigh across your whole history, not just the last month, so one bad patch does not get forgiven the moment you catch up. It does fade, but slowly.

How much of your available credit you are using

This is usually the second heaviest factor. It compares what you owe on revolving accounts, mainly credit cards, against the limit on those accounts. Running a card close to its limit signals more risk than owing the same amount spread thinly across several cards with room to spare. This is also the factor that moves fastest in the other direction: pay a balance down and the improvement can show up within a billing cycle, because it is usually calculated from a snapshot of what you owe right now, not a rolling average.

How long you have had credit

The age of your oldest account and the average age of all your accounts both matter. This one cannot be rushed. It only moves forward at the same speed time does, and it is the main reason closing your oldest card is worth thinking twice about, since it can eventually drop out of the average once it closes.

The mix of credit types you handle

Managing a mix, such as a card and a loan, rather than only ever having one type, tends to help a little. This carries much less weight than the first two factors and is not worth chasing on its own. Do not open a loan you do not need just to diversify your file.

How much new credit you have applied for recently

Each application for new credit tends to trigger a hard inquiry, and a cluster of them in a short window can look like financial stress, even if you were only shopping for the best rate. Most models are lenient about this if the applications are for the same type of loan within a short shopping window, such as comparing mortgage or auto loan offers, but a scatter of applications for different types of credit reads differently.

What does nothing, despite the folklore

Checking your own score. Looking up your own report or score is treated as a soft inquiry, not a hard one, and it does not affect your score at all. Check as often as you like.

Your income. Income is not part of your credit score. It matters enormously to whether a lender approves you and for how much, but the score itself does not know what you earn.

Being married, or to whom. Your score is tied to you as an individual, built from accounts in your name. A spouse's history does not merge into yours unless you hold accounts jointly.

Changing jobs or moving house. Neither event touches your score directly. They can matter indirectly if they affect your ability to pay something on time, but the address change or the new employer is not itself a factor.

Using a debit card. Debit card spending does not touch your credit file at all, because you are spending your own money rather than borrowing. You could spend heavily on a debit card every day and it would have zero effect either way.

Carrying a small balance on purpose. A persistent piece of folklore holds that you must carry a balance month to month to build credit. You do not. Paying your statement in full every month still gives the account activity to report and avoids interest, which is the better outcome.

How long things actually take to move

Some of this responds fast, some of it does not respond at all until time passes on its own.

• Utilization can shift within one billing cycle. Pay a card down and the next reported balance reflects it.
• A single late payment stays visible on your file for a long time, though its effect on the score itself tends to fade the further behind it in your history.
• Length of history improves only at the pace of the calendar. There is no way to accelerate it beyond keeping old accounts open.
• Hard inquiries drop off individually after a period of time and their effect on the score fades well before that.
• Paying off a collections account does not erase that it happened, but it can still help, and some newer scoring models treat a paid collection more favorably than an unpaid one.

What to do this week

Pull your own report and check two things only: whether every account on it is actually yours, and how close each revolving balance sits to its limit. If you find a balance running high against its limit, paying it down, even partway, before the statement closes is the one action here most likely to show up as a visible change soonest. Everything else on this list works on its own schedule.