Utilization is usually based on reported balances
Many card issuers report the statement balance to credit bureaus. Paying before the statement closes can reduce the reported balance, while paying after the due date only may still leave a high balance reported.
Overall and per-card utilization both matter
A low total utilization ratio can still look weaker if one card is nearly maxed. Spread and concentration can both affect perceived risk.
A lower balance can help faster than a new account
Paying down revolving balances directly lowers utilization. Opening new credit may add available limit, but it can also create inquiries and reduce average account age.
Utilization is not the same as payment history
Paying on time is essential, but a person can pay on time and still show high utilization if large balances are reported.