Dental Practice Working Capital: How Much Do You Actually Need

A general practice collecting $1.2 million a year, booked solid, collecting 98 cents on every dollar it bills, can still be $83,000 short of the cash it actually needs to operate. Not because the dentistry is bad or the overhead is sloppy, but because somebody told the owner to keep three months of expenses in the bank and that advice was built for a practice with a completely different payer mix. Cash doesn't follow production. It follows your slowest payer.

Here's the claim an informed owner can argue with: the months-of-overhead rule that every consultant, banker and study club repeats is not a conservative starting point, it's a coin flip. For a fee-for-service practice it parks six figures of dead money in a checking account earning nothing. For a Medicaid-heavy practice it leaves the owner one credentialing lapse away from a personal guarantee. The right working capital number isn't a multiple of your expenses at all. It's the sum of three things you can actually measure: the money your payers are holding, one full payroll cycle, and the single worst survivable shock you can name out loud.

Your Payer Mix Sets the Cash Floor, Not Your Overhead

Working capital in a dental practice exists for one structural reason: you deliver the treatment, pay for the materials, pay the hygienist and the assistant and the front desk, and then wait. Bay Street Lending puts that lag at 30 to 90 days, with PPO and HMO claims clearing in 30 to 60 days and Medicaid running 45 to 90. The same analysis notes insurance accounts for 60 to 75 percent of practice revenue. So for most practices, somewhere between three fifths and three quarters of production goes out the door and sits in somebody else's system for a month to a quarter before it comes back.

That gap isn't a one-time event you fund and move past. It's permanent. The day you open, you fund roughly 45 days of insurance production out of pocket, and you never get it back until you sell or close, because every day a new day's production replaces the day that just cleared. It behaves like inventory. It's capital you bought and can't spend.

Which means the variable that drives your cash requirement is not your expense ratio. It's what share of your revenue is insurance and how long your specific payers take. Two practices with identical collections, identical overhead and identical staffing can need numbers that differ by $175,000. The overhead rule can't see that, because overhead doesn't appear anywhere in the equation.

Three Practices, Same $1.2 Million, Three Different Numbers

Take a general practice collecting $1.2 million a year. That's $100,000 a month. Run it at 65 percent overhead and the monthly operating cost is $65,000. Three months of that is $195,000, and that's the number the rule of thumb hands every one of these owners.

Now build the number from the parts that actually matter.

Practice A, 70 percent PPO, 45-day average clearing. Insurance production runs $70,000 a month. At a 45-day average, the permanent float is $105,000. Staff payroll at 28 percent of collections adds one full cycle of $28,000. The named shock: the largest single PPO contract represents 25 percent of collections, and a credentialing lapse on a transfer or a new associate stalls those claims for 75 days, which is $62,500. Total requirement: $195,500. The rule of thumb nails it, by accident.

Practice B, fee-for-service with 10 percent out-of-network claims. Insurance production is $10,000 a month, and at 45 days the float is $15,000. Same $28,000 payroll cycle. The named shock here isn't a payer, it's a chair or a departure, call it $60,000. Total: $103,000. The rule of thumb tells this owner to hold $195,000, which means $92,000 sitting idle in an operating account instead of paying down the practice note or funding the second hygiene column.

Practice C, 75 percent insurance with a heavy Medicaid book, 75-day average. Insurance production is $75,000 a month and the float is $187,500. Add the $28,000 payroll cycle and the same $62,500 payer shock and the requirement is $278,000. The rule of thumb leaves this owner $83,000 short.

Same revenue. Same overhead percentage. A $92,000 overshoot in one practice and an $83,000 shortfall in another, from the identical piece of advice. Our view: if a formula can be off by $175,000 in either direction across three ordinary general practices, it isn't a conservative rule, it's noise with a confident tone.

The Mistake: Counting Receivables as Money

The specific error we see most often comes from two groups. First, the acquisition buyer in months six through eighteen, who looks at a balance sheet showing $140,000 in accounts receivable and a $40,000 operating balance and concludes the practice has $180,000 of cushion. It has $40,000. The receivables are the float, they're already committed, and the only way to convert them to spendable cash is to stop producing, which is the one thing that guarantees the problem gets worse.

Second, the de novo owner in year two, who treats an undrawn line of credit as the reserve. An undrawn line is a reserve right up until the quarter you actually need it, which is also the quarter your trailing twelve-month numbers look worst, which is the quarter the bank re-underwrites. Availability and access are different products. We'd never count a line you haven't drawn as working capital on your own planning sheet. Count it as a hedge against the shock number, not as the float.

There's a third version of this, quieter and more expensive: the owner who funds the float with the owner draw. They take a smaller distribution in slow months and call it discipline. What they've actually done is make the household the practice's lender at zero documented interest, with no term and no covenant. That works until a tax bill and a slow payer land in the same 30 days.

The 4.9 Percent Problem Makes Self-Funding Harder Every Year

The traditional answer to all of this is to build the reserve out of margin over a couple of good years. That's getting harder. ADA Health Policy Institute data puts 2025 average net income for general-practice dentists at $215,320, with practice expenses rising 4.9 percent against revenue growth of just 1.4 percent over the trailing five-year period.

Run that against the $1.2 million practice. Expenses of $780,000 growing 4.9 percent is $38,220 of new cost. Revenue of $1,200,000 growing 1.4 percent is $16,800 of new collections. The net is $21,420 of margin gone in a single year. Against the ADA's average net income figure, that's about ten percent of a general dentist's take-home, vanishing without a single clinical or scheduling decision changing.

So the owner who plans to accumulate $100,000 of working capital out of retained earnings over three years is racing a cost curve moving three and a half times faster than the revenue curve. That plan doesn't fail dramatically. It just never finishes.

A 5 Percent Liquid Reserve Is a Lender's Floor, Not Your Target

Buyers and startup owners inherit a different anchor. Lenders financing dental practice startups and acquisitions typically require the borrower to hold liquid cash of at least 5 percent of the total loan amount as a condition of closing. On a $700,000 acquisition loan that's $35,000.

Thirty-five thousand dollars is a credentialing delay and a broken sensor. Measured against Practice A's real requirement of $195,500, the lender's condition covers about 18 percent of what the practice needs to run. That isn't the bank being careless. The 5 percent test protects the bank's first payment, not your fourth month. Treat it as a floor you should beat by roughly three times before you sign, and if you can't, you're not short on confidence, you're short on capital.

Borrow the Float, Bank the Shock

Here's our call on structure. The float is permanent and predictable, so it should be financed with permanent, predictable money. The shock is episodic and unpredictable, so it should sit in cash you control.

SBA 7(a) loans go up to $5 million and are routinely used by dental startups and acquisitions for working capital. The 7(a) Working Capital Pilot guarantees 85 percent of loans at or below $150,000 and 75 percent above that, with maturities running up to 60 months. A five-year term on the float portion matches a cost that behaves like a fixed asset, which is what the float is.

What we wouldn't do: fund permanent float with a revenue-based advance, a merchant cash product, or the practice credit card. Those instruments price for 30 to 90 days of risk and your float is a 20-year obligation. Paying short-term pricing for a structural cost is how a profitable practice ends up with a payment schedule it can't restructure. We'd take the term money and keep the line untouched for the shock.

Four Moves Before Friday

Pull your last 90 days of claims and calculate one number: the weighted average days from submission to deposit, by payer, not the practice-wide average your software reports. Multiply your monthly insurance production by that figure divided by 30, and that's your float, the amount of cash permanently out of your hands. Add one full payroll cycle and the dollar value of your single largest payer going dark for 75 days, then compare that total to what's actually in the operating account this morning. If the gap is more than one month of collections, start the term-debt conversation this week, while your trailing twelve looks good, because the month you need the money is the month you can't get it.

Half of this equation is your true monthly operating cost, and most practices have that number wrong by five to eight points once owner comp, deferred equipment and the real supply run are in the right columns. If you want to see where your overhead actually sits against practices your size before you set a cash target on top of it, run your own numbers through our overhead calculator. The more owners who do, the sharper the payer-lag benchmarks get for everyone.

What we're watching next: whether the 60-day PPO is becoming the 75-day PPO. If average clearing times drift even ten days across the major carriers, every float number in this piece rises by about 22 percent and a lot of practices that are adequately capitalized today stop being so without changing anything they do. We'd revise the whole framework if clearing times tightened instead. We don't expect them to.