Primary checking refers to the main bank account that you use for everyday expenses and transactions. It is the account you rely on for your regular spending, such as paying bills or buying groceries. Full definition
This account is intended to be the account holder's primary checking account in which payroll transactions and day - to - day spending activities occur. (msbmi.com)
Not including business accounts, you should only ever have one primary checking account. (personalprofitability.com)
(In cases where job applications are screened by computerized systems, the keywords operate as primary checks on applications.) (cvtips.com)