Most credit-score advice is technically true and practically useless, because it never says how much anything is worth. “Keep your credit mix varied” and “pay every bill on time” get listed as though they’re comparable. They aren’t. One is 10% of the score. The other is 35%.
So here’s the same advice, sorted by weight, with the myths marked.
The scoreboard
View the data
| Payment history | 35% |
|---|---|
| Amounts owed | 30% |
| Length of history | 15% |
| New credit | 10% |
| Credit mix | 10% |
Source: myFICO — What’s in my FICO Score, accessed .
Payment history and amounts owed are 65% between them. If you only ever act on two things, act on those, and treat the rest as tidying.
These weights are FICO’s, and FICO is a US model: British and Canadian bureaus run their own scales and their own maths. The ranking of what matters is broadly consistent across all three, but the numbers are not transferable.
What genuinely works
Pay on time, every time (35%). Nothing else in the model comes close. The practical version isn’t willpower, it’s plumbing: automatic payment of at least the minimum on every account, an alert a few days before the due date, and due dates set just after you get paid. If a month is tight, pay something before the due date. An account 30 days late is treated very differently from one at 90.
Use less of your available credit (30%). The measure is what share of your limits you’re using, not what you spend. Two levers move it: pay down balances, or increase limits without increasing spending. There’s a third, subtler one — when you pay. Most issuers report your statement balance, so a card paid in full after the statement closes can still report a high balance. Paying before the statement date reports a lower one, and the score reads that snapshot.
Keep old accounts open (15%). Age accrues to your file only while the account exists. Your oldest card is doing quiet work; if it has no annual fee, keep it alive with one small recurring charge.
Apply for credit deliberately (10%). Several applications in a short window means several hard inquiries and a lower average account age. Space them out, and check whether a lender offers pre-qualification with a soft pull before you formally apply.
Fix errors on your report. This isn’t a category — it’s a correction. As the CFPB notes, you don’t have one credit score: different models and different bureaus produce different numbers from different data. An error sitting on one bureau’s file can be dragging one score while the others look fine, and you’ll never notice unless you look.
What doesn’t work
Myth: carrying a balance builds credit. It doesn’t. Paying in full reports the same on-time payment and a lower utilisation. This myth is unusually expensive because believing it costs you interest every single month, in exchange for nothing.
Myth: closing unused cards helps. Closing a card removes its limit from your total available credit, so your utilisation goes up overnight even though your spending hasn’t changed. Close the one with an annual fee you don’t want to pay; keep the free ones open.
Myth: checking your score hurts it. Your own check is a soft inquiry and doesn’t register in the score at all. This myth stops people from noticing errors, which makes it actively harmful.
Myth: there’s one number. There are many, and they disagree. A lender may pull a different bureau, a different model, or a different version of the same model. Don’t panic over a ten-point discrepancy between two apps.
Myth: you can pay someone to make it fast. Nobody can remove accurate negative information, and nobody can shorten the time that history takes to build. What credit repair companies can and can’t legally do is worth reading before you hand anyone money for speed.
How fast each lever moves
Worth setting expectations, because the categories behave very differently in time:
| Action | When it shows up |
|---|---|
| Paying down a balance | Next reporting cycle, often a statement or two |
| Requesting a limit increase | Next reporting cycle, if granted |
| Fixing a reporting error | After the dispute resolves |
| A missed payment recovering | Slowly, over months and years |
| Length of history | Only with time; nothing accelerates it |
That table is the honest reason “raise your score fast” advice tends to focus on utilisation. It’s the only major lever that responds quickly, which makes it the right thing to target before a mortgage application and the wrong thing to rely on as a long-term strategy.
The short version
Set every account to autopay so payment history takes care of itself. Keep utilisation low, and pay before the statement closes rather than after. Leave old cards open. Apply for new credit rarely and deliberately. Check your reports at all three bureaus once a year and dispute anything wrong.
That’s the whole list. Everything past it is margin work, fine to do eventually, not worth reorganising your finances over. Get the two big levers right and the rest of the credit score guide becomes optional reading, not homework.