Credit files are accessed constantly, by lenders, insurers, employers and the consumer themselves. Only a small fraction of those accesses affect a score, and the dividing line is who initiated it and why.
The distinction is permissible purpose
Access to a credit file requires a legally permissible purpose. Reviewing an existing account, screening for a pre-approved offer and evaluating a new application are all permissible, but they differ.
A hard inquiry is recorded when the consumer applies for credit and the lender pulls the file to make a decision on that application.
A soft pull covers everything else: account review, prescreened marketing, identity checks and consumers viewing their own report.
Only hard inquiries appear on the lender's copy
Soft inquiries are recorded and shown to the consumer, so a report can look crowded with entries that no lender will ever see.
The version supplied to a lender omits soft pulls entirely, because they carry no information about whether the consumer is seeking new borrowing.
This is why a report full of soft entries has no bearing on an application, despite frequently alarming the person reading it.
The signal is applications, not access
A hard inquiry matters because someone applying for credit at several places in a short window may be under financial pressure that the file has not yet recorded.
The inquiry is a leading indicator. It appears before any new account, balance or missed payment shows up on the file.
Its weight is small relative to payment history and utilization, and it decays quickly, with most models disregarding it well before it drops off the report.
Rate shopping is compressed into a single event
Someone comparing mortgage or auto loan offers necessarily generates several hard inquiries for one borrowing decision.
Scoring models handle this by treating multiple inquiries of the same type within a short window as one inquiry, so comparison shopping is not penalised repeatedly.
The window differs between models and the deduplication generally applies only to instalment lending, not to card applications.
Prequalification uses a soft pull by design
Prequalification and pre-approval tools check eligibility against a soft pull, which is why they can be used freely without affecting a score.
The outcome is an indication rather than an offer, since the lender has not yet seen the full file or verified income and employment.
Converting to a real application triggers the hard inquiry, and the final terms can differ from the prequalified indication once full underwriting takes place.