The five inputs, in order of weight
Scoring models differ in detail, but the broad hierarchy is consistent: paying on time matters most, how much of your available credit you are using comes next, then how long your accounts have existed, then your mix of account types and recent applications.
- Payment history — the single largest factor. One 30-day late mark can cost more than years of good behaviour earned.
- Credit utilisation — the share of your limits you are using, measured per card and overall.
- Length of credit history — average age of accounts, which is why closing an old card can hurt.
- Credit mix — revolving cards alongside instalment loans reads as broader experience.
- New credit — each hard inquiry has a small, temporary effect; a cluster of them does not.
