Ambulatory Surgery Center Break-Even Analysis: $181K Monthly Revenue

Fixed costs $147.9K/mo Core monthly base

Contribution margin 81.5% After variable costs

Break-even revenue $181.5K/mo Monthly target

Break-even timing Month 1 Launch month

Break-even calculator

Use this to test monthly revenue against direct costs and fixed overhead for the center.

Lean Base Full

Monthly revenue Revenue sets the pool that must cover variable costs and fixed overhead. $ Lower sales Higher sales Variable expenses Direct costs like supplies, billing fees, and acquisition spend rise with more procedures. $ Lower direct cost Higher direct cost

Money available to cover fixed costs $529,516 $641,050 revenue - $111,534 variable expenses

Margin ratio

83%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead the center must cover before profit starts. $ Lean overhead Higher overhead

Break-even chart Revenue Total costs

Which expenses are fixed and which move with case volume for an ambulatory surgery center?

Cost classification

Break-even only works if each expense behaves the right way in the model. Here, rent stays fixed, supplies follow revenue, and payroll steps up as case volume and staffing needs rise.

Expense	Cost	Break-Even Treatment	Common Mistake
Facility Lease	Fixed	Use $30,000 per month as baseline overhead from Month 1 through Month 60.	Treating rent as case-linked instead of a monthly commitment.
Administrator and care team payroll	Semi-fixed	Use $90,417 in first-year monthly wages, then step up as full-time staffing rises.	Ignoring staff step-ups when nurses, technicians, admissions, and billing headcount increase.
Medical and Surgical Supplies	Variable	Apply 8.0% of revenue in the first year, tapering to 7.0% by the fifth year.	Averaging implant-heavy and light cases into one flat supply rate.
Implant Costs	Variable	Apply 5.0% of revenue in the first year, tapering to 4.5% by the fifth year.	Not tying implant expense to case mix and procedure type.
Billing and Collections Fees	Variable	Apply 3.5% of revenue in the first year, tapering to 3.0% by the fifth year.	Treating collections fees as fixed admin overhead.
Utilities and sterilization load	Semi-variable	Use the $5,000 monthly utilities baseline, with added pressure as procedure volume rises.	Leaving no cushion for sterilization, HVAC, and operating room usage ramps.

How does break-even change from lean opening to full utilization at an ambulatory surgery center?

Scenario table

Lean and base cases both clear fixed overhead, and the cushion widens as surgeon count, room use, payer mix, and case mix improve. The quick math is simple: revenue grows faster than fixed cost, so margin expands.

Planning assumptions only; actual results will move with utilization, staffing, and payer mix.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean opening	$539,250	$99,761	$147,917	81.5%	$291,572	Break-even is covered, but the cushion is still tight.
Base case	$1,135,215	$204,339	$165,833	82.0%	$765,043	Room use and surgeon volume create a much safer margin.
Full utilization	$3,311,600	$529,856	$215,833	84.0%	$2,565,911	Strong cushion; case mix becomes the main lever.

What pushes this ambulatory surgery center off break-even?

Stress test

The base plan clears break-even at $181,493 in revenue, but the cushion can shrink fast. Referral delays, payer pressure, staffing inflation, or an implant-heavy mix are the main risks because they push break-even revenue higher.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$181,493	$357,757 cushion	Base case has a wide buffer.
Revenue shortfall	Year 1 revenue falls 20% to $431,400.	$181,493	$249,907 cushion	Referral delays cut the cushion fast.
Fixed-cost pressure	Fixed costs rise 10% to $162,708.	$199,642	$339,608 cushion	Overhead inflation raises the hurdle.
Margin pressure	Variable expenses rise 5 points, cutting margin to 76.5%.	$193,355	$345,895 cushion	Payer mix or implant-heavy cases hit margin.
Combined pressure	Revenue falls 20%, fixed costs rise 10%, and margin drops 5 points.	$212,690	$218,710 cushion	Delays and cost inflation can burn the buffer fast.

What should you verify before signing the lease for this ambulatory surgery center?

Founder checklist

Before you sign the lease, prove the first-year surgeon pipeline and case mix can fill 135 planned cases a month and cover the $147.9K monthly overhead. Month 1 operating break-even is not cash safety; the model still bottoms at -$1.168M in Month 8 and pays back in 16 months.

1Surgeon pipeline8 providers

Verify Year 1 support from 2 orthopedic surgeons, 2 general surgeons, 1 ophthalmic surgeon, 2 anesthesiologists, and 1 pain physician before you commit, because the schedule starts with people, not the lease.

2Launch run-rate$525K/mo

Verify the first-year case mix can reach about $525K in monthly revenue from 135 planned cases, because Month 1 operating break-even only works if real volume shows up.

3Fixed load$147.9K/mo

Verify the $147.9K monthly fixed base from lease, utilities, insurance, IT, compliance, maintenance, office, professional services, and Year 1 payroll is covered before you add more FTEs.

4Margin mix81.5% CM

Verify the case mix keeps about 81.5% contribution margin in Year 1, since supplies, implants, billing fees, and patient acquisition still take 18.5% of revenue.

5Staffing ramp14.5 FTE

Verify you can staff 14.5 FTE in Year 1 across admin, clinical, nursing, tech, front desk, billing, and records roles without outrunning volume, because payroll follows scheduled cases.

6Cash trough-$1.168M

Verify you can fund the Month 8 cash low of -$1.168M while the $3.88M build-out and equipment plan lands in Months 1 to 9, because payback takes 16 months and cash can fail first.