I keep a $1500 buffer. I have free checking under my student account right now, but that expires in July and to keep free checking I'll need an average daily balance of $1500. It also works out well because that's just a little more than one month's living expenses, so I treat it like a little baby EF that would get used before tapping into the bigger EF if anything happened.
I wouldn't feel comfortable going below $500, my cash flow for the first half of the month is always negative because that's when all the big bills are due, then I make it up in the second half of the month when I just pay for groceries, gas, and move some cash for my sinking funds.










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