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What's the purpose of having separate checking and savings accounts?
For some people, it's easier to stick to a budget if they have separate checking and savings accounts because they can deposit funds directly into their savings account and not have those funds accessible by debit/credit card, checks, etc. This allows people to pay themselves first and accumulate savings, while making it slightly more difficult to spend those savings on a whim. One a more technical/legal note, one key difference in the United States comes from Regulation D. §204.2(d)(2) of the law limits you to six withdrawals from savings and money market accounts. No such limit exists for checking accounts. Regulation D also forbids banks from paying interest on business checking accounts.  In the simplest case, checking accounts and savings accounts are a tradeoff between liquidity and return. Checking accounts are much more liquid, but won't necessarily earn interest, while savings accounts are less liquid because of the withdrawal limits, but earn interest. Nowadays, however, sweep accounts blur this line somewhat because they function like checking accounts, in that you can write an unlimited number of checks, make an unlimited number of withdrawals, etc. but you can also earn interest on your account balance because some or all of the funds are "swept" into an investment account when not in use. The definition of "in use" can vary from business to business and bank to bank.