After two years of running everything through one personal checking account, I finally split things properly. The setup took an afternoon to configure and has saved me hours every month since.
Account one: a dedicated business checking account. All client payments land here. Nothing personal touches it. When tax season arrives, one export from this account produces most of what my accountant needs.
Account two: a high-yield savings account labeled Taxes. Twenty-five percent of every incoming payment moves there automatically.
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Account three: a high-yield savings labeled Buffer. Ten percent of every payment lands here. This account exists for slow months.
Account four: personal checking. Only pays a fixed monthly salary from account one. That salary is small enough to be sustainable even in slow months.
The result is that my personal spending is decoupled from my income volatility. Whether I invoiced ten thousand or two thousand last month, my personal cash flow looks the same. That psychological stability turned out to be worth as much as the tax organization.