I don’t care about investment returns and opportunity costs.
I‘m managing it on a purely “psychological” basis:
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Daily consumables and discretionary expenses are always paid by credit card
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Basic monthly necessities and (quasi-) monthly bills are paid from income on my current account: rent, electricity, internet, incidentals and the monthly credit card bill. All on a relatively tight budget.
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Larger yearly expenses (some of which I deliberately chose to pay annually) are paid from my savings account: tax, health insurance, yearly 3a contribution, transport pass, education, travel.
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I‘ve set up a monthy standing order to transfer the sum of anticipated yearly outgoings from my current account to my savings account in monthly “instalments”.
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I’ve also set up a monthly standing order to transfer a fixed sum each month from my current account to my investment account.
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At the end of each month, I swipe the remaining balance on my current account and transfer to my savings account as well (though every once in a while I cheat and buy me something really nice).
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At the turn of the year, after having paid all yearly expenses (and for christmas gifts), I swipe the remaining balance from my savings account as well, transferring it to my investment account.
That basically sums up the entirety of my cash management strategy - and budgeting as well. I’ve just had to come up with a reasonable yet somewhat tight figure for monthly consumption and expenses that I’m allowing myself.