A plain-language breakdown of the five FICO scoring categories, what actually moves each one, and the myths that quietly cost people points.
The five categories
Every FICO score is built from the same five categories. The weights below are the classic FICO 8 mortgage-relevant model — the exact number shifts a few points across models, but the levers are the same.
- Payment history — 35%
- Amounts owed (utilization) — 30%
- Length of credit history — 15%
- Credit mix — 10%
- New credit (inquiries and new accounts) — 10%
Payment history is the whole game
One 30-day late payment on a mortgage can cost a strong file 80–110 points overnight. A single collection can cost more. Nothing else in the model has that kind of leverage.
The practical rule: never miss a payment, even if you can only afford the minimum. If you cannot pay on time, call the creditor before the due date — most will grant a one-time courtesy that keeps the late off your report.
Utilization is the fastest lever you control
Utilization is your reported credit-card balance divided by the credit limit. It is calculated per card and in aggregate, and only the number reported on the statement date matters — not the number after you pay.
The score bands people notice most: under 30% is 'okay,' under 10% is 'strong,' and 1–3% on one card with the rest at zero tends to score highest of all. Zero across the board actually scores slightly lower than 1–3%, because the model wants to see active use.
- Pay the balance down before the statement closes, not before the due date.
- Ask for credit limit increases every 6 months — a higher limit lowers utilization instantly.
- Never close an old card just because you don't use it; you lose the limit and the age.
Length of history rewards patience
Two numbers matter: the age of your oldest account and the average age across all accounts. Opening a new card lowers your average age; closing an old one eventually removes it entirely (after 10 years).
For a mortgage, underwriters want to see at least one tradeline open for 24+ months. Two or three seasoned tradelines are ideal.
Mix and new credit — small levers, easy to misuse
The model likes to see a revolving account (credit card) and an installment account (auto, student, or personal loan) on the file. You do not need to force this — never take a loan just to build mix.
Hard inquiries cost 2–5 points each and fall off the score after 12 months (they stay on the report for 24). Rate-shopping for a mortgage or auto within a 14-day window counts as one inquiry — use it.
The myths that cost points
Checking your own credit is a soft pull and does not cost points. Paying a collection does not always remove it — always negotiate a 'pay for delete' in writing. Closing a card 'to be safe' can hurt your score more than any purchase you were worried about.