Working capital is the cash that carries a new dental practice until collections cover overhead. The Alithos planning model sets it at $85,000 as a fixed line, decided before equipment, not funded from leftovers. Your real need depends on monthly overhead, how fast new patients arrive, your payer mix and your personal living costs, so size it from a month-by-month ramp.
No dentist ever fell in love with the working-capital line. There's no chair to sit in and no rendering to admire. It's just cash in an account, doing nothing. Until month two, when it quietly becomes the most important number in the project.
Why does a dental startup need working capital?
Because the bills start before the money does. On opening day your overhead is close to fully loaded: rent, payroll, supplies, lab, software, marketing, insurance and the loan payment. Your schedule is not. A startup opens with a calendar that is mostly holes and fills as new patients find you.
Then there is the lag. Production is the dentistry you do. Collections are the money that actually arrives. Patient portions can be collected at the visit, but insurance collections lag production by weeks. So even a good month on the schedule shows up in the bank account later. If you are joining insurance networks, credentialing takes time too, and you can't bill in network until it's done.
Put those together and a new practice runs a cash shortfall for its first several months. Working capital is the money that covers that shortfall. It is not a cushion for emergencies. It is a planned expense, the same as the X-ray unit. A mature practice runs very differently: one dental lender writing in ADA News puts overhead in a well-run general practice at 58% to 68% of collections [4]. A startup's overhead runs above 100% of collections at first, by definition, until the ramp catches up.
How much working capital does a dental startup need?
The Alithos estimator assumes $85,000 of working capital as a flat line in every scenario [6]. It is in every row of the cost benchmark, including the 4-operatory lease startup at standard finish that the model puts at about $746,000 to $824,000 all-in. I use a flat number on purpose. It forces the line into the budget before anyone starts trading it away for equipment upgrades.
But $85,000 is a planning default, not your answer. Your answer is the peak cumulative shortfall in your own ramp, plus your living costs, plus a cushion. Four inputs move it more than anything else:
- Monthly overhead. Rent, payroll, supplies, lab, software, marketing and the loan payment. A bigger office or a larger opening team means a bigger monthly burn.
- New-patient flow. How fast the schedule fills. Location, visibility, marketing runway and any referral base all matter here.
- Payer mix. In-network plans can bring patients in sooner but depend on credentialing and pay on insurance timelines. A fee-for-service plan may fill more slowly but collects more at the visit. Model the mix you actually plan.
- Personal living costs. A working spouse's income or savings already set aside for the household changes the number a lot. So does a large student loan payment.
You will see rules of thumb that size working capital as a fixed number of months of overhead. I don't use them, because they hide the one thing that matters: how fast your collections come in. Two practices with the same overhead can need very different reserves. Build the ramp instead. It takes an afternoon.
Working capital is one line of seven in a startup budget. The dental practice startup costs guide walks through the other six.
How do you build a month-by-month ramp?
Use five columns. For each month from opening: overhead, expected collections, net burn (overhead minus collections) and the running total of net burn. The highest point of that running total is the cash the practice needs to survive the ramp.
- Set monthly overhead. List every fixed and variable cost, including the loan payment. Leave your own pay out for now. Holding overhead flat is conservative, because supplies and lab rise with production.
- Estimate collections by month. Start from expected new patients and production, then shift insurance collections later to reflect the lag. Be honest about month one.
- Subtract. Net burn = overhead minus collections. It is positive while you're losing cash.
- Add it up. Cumulative shortfall = last month's total plus this month's net burn. Stop when it starts falling for good.
- Read the peak, then add. Take the highest cumulative figure, add personal living costs for the months the practice can't pay you, and add a cushion. I'd add at least one more month of overhead on top.
Here is how that looks with example numbers. These are illustrative inputs I made up for the arithmetic, not benchmarks or survey data. Overhead is $45,000 a month, which includes the model's loan payment of about $7,614 a month on a 4-operatory lease startup [6]. Owner pay is excluded.
| Month | Overhead (A) | Collections (B) | Net burn (A − B) | Cumulative shortfall |
|---|---|---|---|---|
| 1 | $45,000 | $6,000 | $39,000 | $39,000 |
| 2 | $45,000 | $15,000 | $30,000 | $69,000 |
| 3 | $45,000 | $24,000 | $21,000 | $90,000 |
| 4 | $45,000 | $31,000 | $14,000 | $104,000 |
| 5 | $45,000 | $37,000 | $8,000 | $112,000 |
| 6 | $45,000 | $42,000 | $3,000 | $115,000 (peak) |
| 7 | $45,000 | $46,000 | −$1,000 | $114,000 |
| 8 | $45,000 | $49,000 | −$4,000 | $110,000 |
| 9 | $45,000 | $52,000 | −$7,000 | $103,000 |
In this example the practice needs $115,000 just to reach the month where collections pass overhead. That is already more than the model's $85,000 default, and it doesn't yet include the owner's living costs. Now change one assumption.
| Example scenario | Peak cumulative shortfall | Peak month |
|---|---|---|
| Base ramp (table above) | $115,000 | 6 |
| Same ramp, every collection arrives one month later | $160,000 | 7 |
| Base ramp plus $7,000 a month of household costs for six months | $157,000 | 6 |
| One month later plus household costs | $202,000 | 7 |
The lesson in the second row is the one I want you to remember. A one-month delay in collections raised the need by $45,000, exactly one month of overhead. A slow credentialing approval, a late signage permit or a soft first marketing push can each cost you that month. Your own numbers will differ. The shape won't.
Can working capital be financed?
Yes, usually. In most dental startups it is financed inside the project loan rather than paid in cash.
- In the project loan. SBA 7(a) loans list working capital as an eligible use [1], generally with a maturity of up to 10 years for working capital [2]. Some dental lenders advertise startup packages that include it. Bank of America Practice Solutions, for example, advertises up to 100% project financing for new office startups, covering design, construction, equipment and working capital, subject to credit approval [5].
- Not in an SBA 504 loan. 504 loans are for real estate and major fixed assets and cannot be used for working capital [3].
- In a line of credit. A line is a limit you draw on as needed, usually at a variable rate. Lenders can often reduce a line or decline to renew it, and lines are easiest to get when you need them least.
Financing the reserve is cheap relative to running short. At the Alithos model's planning terms of 8.25% over 15 years, $85,000 inside the loan adds about $825 a month to the payment [6]. Run your own size and rate in the dental loan payment calculator. Note that a 10-year working-capital term on an SBA loan carries a higher payment than 15 years would.
Working capital in the term loan is cash you hold on opening day, on known terms. A line of credit is a promise of cash later, on terms the lender can change. I treat a line as a backstop behind the reserve, never as the reserve itself. Ask how the working-capital portion is disbursed (all at closing, or in draws), whether interest-only months apply, and what the line's renewal terms are, in writing.
I'm not a lender, attorney or CPA, and nothing here is a loan offer or tax advice. Lenders set their own terms. The dental practice financing guide covers loan types, term sheets and the SBA rules in more depth.
How do lenders read your working-capital line?
As ramp risk. An underwriter looking at a startup has no operating history to lean on, so they look at your plan for surviving the months before the practice supports itself. A thin working-capital line says you're hoping through the ramp. A line that ties to a month-by-month model says you've done the arithmetic.
That is why asking for more working capital can strengthen an application rather than weaken it. It shows the lender you expect the ramp and have paid for it. It also protects the number lenders care about most: debt-service coverage. Many dental lenders look for coverage of at least 1.25x, and one lender writing in ADA News calls that a guideline rather than a strict minimum [4]. Many lenders calculate global coverage, which counts your living costs and personal debt, not just the practice loan. You can test your own coverage in the DSCR calculator.
Acquisitions are different. A practice you buy comes with patients and collections already flowing, so the ramp is shorter. Even there, the same ADA News column says lenders often want to see a cash reserve at closing, often in the $50,000 to $75,000 range [4]. If you're weighing the two paths, see startup vs. acquisition. For more on how underwriters think, read what dental lenders want to see.
What are the two classic working-capital mistakes?
Funding it with leftovers. Working capital budgeted as "whatever's left after equipment" is how a $20,000 equipment upgrade quietly becomes a month-four crisis. It's one of the predictable costs that ambush first-time owners. Set the line first, from your ramp, and defend it. If the project total runs high, cut finishes or equipment options before you touch working capital.
Spending it like profit. The account balance in month one looks like wealth. It's runway. Every dollar spent on something outside the plan is a dollar missing in month five, when the shortfall peaks. Gate every discretionary purchase against the ramp plan, not the checking account balance.
How should you track working capital after opening?
Weekly, against the ramp you built before opening. Monthly reviews find problems a month too late. Each week, put four numbers next to plan:
- Production. The dentistry done that week, compared with the ramp's assumption.
- Collections. The money that actually arrived, split into patient payments and insurance.
- Overhead. What you actually spent, line by line, including anything you didn't plan.
- Cash on hand. The bank balance compared with the cumulative shortfall the ramp predicted for this week.
Watch the gap between production and collections. If it widens, claims are stuck somewhere: credentialing, coding, or follow-up. Fix it before it becomes a cash problem. Track new patients per week too, since they drive every later number.
Decide your triggers before you open. For example: if cash on hand falls a set amount below plan, you pause discretionary spending, review staffing hours and call your lender about the line, in that order. A decision made in advance is calmer and cheaper than one made in month five.
The Budget Plan ($7,500 to $10,000 flat fee, scope in writing) includes the cash-flow and debt-service coverage analysis for your project: a working-capital line sized from your ramp, not a placeholder, in a lender-ready package. I'm paid by you alone, with no commissions from lenders, dealers or contractors.
Working capital FAQ
How much working capital does a dental startup need?
The Alithos estimator assumes $85,000 as a flat planning default. Your real need is the peak cumulative cash shortfall in a month-by-month ramp: monthly overhead minus expected collections, added up until collections cover overhead, plus your personal living costs and a cushion. In the illustrative ramp on this page, the practice's peak shortfall alone is $115,000, before living costs.
Can working capital be included in a dental practice loan?
Often, yes. SBA 7(a) loans list working capital as an eligible use, generally with terms up to 10 years. Some dental lenders, such as Bank of America Practice Solutions, advertise startup financing that covers working capital, subject to credit approval. SBA 504 loans cannot be used for working capital. Ask each lender how it disburses the funds.
What is the difference between working capital and a line of credit?
Working capital in the project loan is cash you already hold on opening day, usually on fixed terms. A line of credit is a limit you can draw on, typically at a variable rate, and the lender can often reduce it or decline to renew it. Use a line as a backstop, not as your main reserve.
When do collections catch up with overhead?
There is no reliable published figure. It depends on new-patient flow, payer mix, insurance credentialing and how lean your overhead is. Insurance collections lag production by weeks, so the crossover comes later than a full schedule. In the illustrative ramp on this page, collections pass overhead in month 7.
Should personal living expenses be part of working capital?
Yes, unless another household income covers them. A new practice may not pay its owner for months, and many lenders count living costs in a global debt-service coverage calculation. Add your monthly household need, times the months before the practice can pay you, on top of the practice's own shortfall.
What happens if I run out of working capital?
You end up borrowing under pressure: drawing a line of credit, asking the lender for more, using personal credit cards or cutting staff and marketing just as the schedule starts to fill. Each option costs more than reserving the cash up front. Track cash weekly against your ramp plan so you see the gap months before it arrives.
Run your project in the cost estimator to see the monthly payment your reserve has to cover, then book a free Project Fit Call to size the reserve for your market and your ramp.
How we research and update this page: every rate, limit and figure here comes from a primary source or a named publisher listed below, or is labeled as an Alithos planning assumption or an illustrative example. Lending terms change; we re-check them when the page is updated. Read the editorial policy.
Sources
- U.S. Small Business Administration, "7(a) loans" (accessed 2026). sba.gov/funding-programs/loans/7a-loans
- U.S. Small Business Administration, "Terms, conditions, and eligibility" (accessed 2026). sba.gov/partners/lenders/7a-loan-program/terms-conditions-eligibility
- U.S. Small Business Administration, "504 loans" (accessed 2026). sba.gov/funding-programs/loans/504-loans
- ADA News, M. Jerkins, "Ask the Expert: How much debt is too much when buying a dental practice?" (2026). adanews.ada.org
- Bank of America Practice Solutions, "Dentist loans" (accessed 2026). bankofamerica.com
- Alithos Advisory, cost estimator and benchmark model (planning assumptions: $85,000 working capital, 15 years at 8.25%, 1.25x coverage; 2026). alithos.co/#benchmark