A credit score looks mysterious, but its recipe is public. The FICO model — used by 90% of top lenders — weighs five factors, and two of them dwarf the rest: pay on time and keep balances low. Do those two things and roughly two-thirds of your score takes care of itself. Here's the full weighting, then ten tips ordered by impact.
| FICO factor | Weight | In one line |
|---|---|---|
| Payment history | 35% | Bills paid on time, every time |
| Amounts owed / utilization | 30% | Share of available credit you're using |
| Length of credit history | 15% | Average age of your accounts |
| New credit | 10% | Recent applications & hard inquiries |
| Credit mix | 10% | Variety of account types |
The tips
- Automate at least the minimum payment. One payment 30 days late can drop a good score dramatically, and the mark reports for up to seven years. Autopay removes the single most common cause of score drops.
- Get utilization under 30% — ideally under 10%. It's recalculated every billing cycle, which makes it the fastest-moving major factor in both directions.
- Pay before the statement closes, not just by the due date. Issuers typically report the statement balance. Paying down $300 on a $1,000-limit card before closing reports lower utilization immediately.
- Request credit limit increases. A higher limit with unchanged balances mathematically lowers utilization — ask whether the review triggers a hard inquiry first.
- Keep old no-fee cards open. Closing them shortens average account age and shrinks available credit, usually hurting more than helping.
- Pull all three reports free and dispute errors. AnnualCreditReport.com offers weekly access; bureaus must investigate disputes within about 30 days.
- Become an authorized user on a family member's long, well-managed card — a genuine boost for thin files, but only if they truly pay on time.
- Get rent and utilities counted. Services like Experian Boost add eligible on-time payments to your file, often lifting newer-model scores instantly.
- Cluster rate-shopping. Mortgage and auto inquiries within a 14–45 day window count as one; spreading applications across months multiplies the dip.
- Ignore the myths. Checking your own score is a soft inquiry (no effect). Carrying a balance doesn't build credit. Income isn't scored at all.
How fast does improvement show?
Utilization changes can appear within one or two billing cycles — paying down cards before the statement date is the classic quick win. Disputes resolve in roughly 30 days. Rebuilding after serious damage (collections, charge-offs) realistically takes six to twelve months of consistent on-time behavior, because negative marks fade gradually as they age. Beware anyone guaranteeing specific score jumps — under the Credit Repair Organizations Act, legitimate repair can't charge upfront fees or promise outcomes, and everything a paid service can do, you can do yourself free.