How much working capital do I need when opening a new medical practice?

You need enough cash to cover every expense from the day you sign the lease until the month your collections reliably exceed your costs. That gap is usually longer than new practice owners expect. There’s no single dollar figure that fits every practice, but for an insurance-based practice it isn’t unusual to need six months or more of full operating expenses set aside.

Keep working capital separate from startup costs. Buildout, equipment, furniture, and your EHR implementation are one-time costs, often financed with a practice loan. Working capital is the cash that pays rent, salaries, software subscriptions, malpractice premiums, and supplies while revenue ramps up. Practices that roll everything into one number tend to spend the cushion on buildout and run short in month four.

Insurance credentialing is the biggest reason the gap is so long. Getting credentialed with each payer commonly takes 90 to 120 days and can run past 150. Until it’s done, claims can’t be paid under your own credentials. Even after approval, payers typically take a few weeks to pay each claim. Meanwhile your staff, rent, and premiums are due from the first month. Starting credentialing four to six months before opening is one of the most effective ways to shrink how much cash you need.

Cash-pay and membership practices have a different problem. Direct primary care, concierge, and med spa owners get paid at the time of service or at enrollment, so there’s no claims lag. The slow part is building a patient panel. A DPC practice might need a year or more to reach the membership count that covers its costs. Your working capital needs to carry you through that ramp.

The most reliable way to find your number is a month-by-month cash forecast covering the first 12 to 18 months. List every expense by month, including when each one actually starts. Then estimate collections realistically. For insurance practices, that means a few months of almost nothing followed by a gradual climb. For membership practices, it means patient count growing month by month at a believable pace. The lowest point on your cumulative cash line is your minimum working capital. Add a cushion for delays, because something always takes longer than planned.

Include your own living expenses. A physician leaving an employed position loses a paycheck the day they resign, and the practice may not support an owner draw for a while. Your mortgage and family bills belong in the forecast too.

It also helps to open a line of credit before you open the doors. Banks lend more easily to a practice that doesn’t need the money yet.

Our new practice setup work includes building this forecast alongside your entity structure, books, and payroll so you open with a clear picture of your runway. If you’re planning a practice and want help pressure-testing your numbers, our medical practice bookkeeping and tax services are built around physicians and clinicians who are running a business for the first time.