A checking account (also called a current account in the UK and Switzerland) is the operational hub of your personal finances. Money paid in by employers or clients is immediately available, you can move it out by card payment, direct debit, standing order or wire transfer, and the balance can be drawn to zero (or below, if an overdraft is agreed) without notice.
Banks rarely pay meaningful interest on checking balances because the deposits are short-term and the bank must keep them highly liquid. In return, customers get a payments toolkit: contactless debit cards, mobile banking apps, instant SEPA transfers in the eurozone, and access to ATMs worldwide. Many institutions waive monthly fees if a minimum salary lands in the account or a minimum balance is kept.
From a financial-planning point of view a checking account is for short-term cash flow only — typically one to two months of expenses. Anything above that buffer should be moved to a savings account, money-market fund or investment portfolio, where it earns a return that at least matches inflation. Leaving CHF 20,000 sitting idle for a year at 0% while inflation runs at 2% is a real-terms loss of CHF 400.
A Swiss employee receives a CHF 7,500 net salary on the 25th of each month into their UBS Personal account. CHF 3,000 leaves over the next ten days for rent, health insurance and bills via direct debit, CHF 1,500 is spent on the debit card, and CHF 3,000 is automatically swept on the 5th into a savings account paying 1.25%.