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What is the preferred way to set up personal finances?
simplicity and roi are often at odds. the simplest plan that also supports a reasonable investment return would have 3 accounts: if you want to get better returns on your investments, things can get much more complicated. here are some optional accounts to consider: besides the mechanics of money flowing between accounts, a budget helps you understand and control your spending.  while there are many methods for this (e.g. envelopes of cash, separate accounts for various types of expenses), the simplest might be using mint.com.  just be sure to put all your spending on a credit or debit card, and you can see your spending by category when you log into mint. it can take a bit to get it set up, and your bank needs to be compatible, but it can give you a really good picture of where your money is going.  once you know that, you can start making decisions like "i should spend less on coffee", or "i should go to the zoo more", based on how much things cost vs how much you enjoy them. if you feel like your spending is out of control, then you can set yourself hard limits on certain kinds of spending, but usually just watching and influencing your own choices is enough. notes:  if you have a spouse or partner, you should each maintain your own separate accounts. there are many reasons for this including simplicity and roi, besides the obvious. if you feel you must have a joint account, be sure to clearly define how it should be used (e.g. only for paying the utilities) and funded (x$ per month each). particularly with your house, do not do joint ownership. one of you should be a renter and the other a landlord. some of these statements assume you are in the usa. on a personal note, i have about 20 credit cards, 2 checking accounts, 2 ira's, 2 brokerage accounts, and 3 401k's. but i consider myself a personal finance hobbyist, and spend an absurd amount of time chasing financial deals and tax breaks.