Clinical Laboratory Break-Even Analysis: $90K Monthly Revenue

Fixed costs $22.8K Monthly overhead

Contribution margin 81% After variable costs

Break-even revenue $28.1K Monthly revenue target

Break-even timing Month 1 Launch month

Break-even calculator

Use this calculator to test how monthly revenue, variable expenses, and fixed costs line up with break-even for a clinical laboratory.

Lean Base Full

Monthly revenue Top-line lab sales set the margin pool that covers overhead. $ Low sales High sales Variable expenses Use direct costs that rise with each sample run or referral. $ Low direct costs High direct costs

Money available to cover fixed costs $217,900 $269,000 revenue - $51,100 variable expenses

Margin ratio

81%

Covers fixed costs

Yes

Fixed monthly costs Use monthly overhead the lab pays even if volume slows. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which clinical laboratory expenses are fixed, and which move with test volume?

Cost classification

In Month 1, fixed overhead is $22,800/month before payroll; misclassifying 10% reagents or 3% commissions as fixed makes break-even look too easy. Keep fixed overhead, per-test spend, and staff step-ups separate.

Expense	Cost	Break-Even Treatment	Common Mistake
Facility Rent	Fixed	Add $15,000/month to fixed overhead from Month 1 through Month 60.	Spreading rent across tests as if it falls when volume drops.
Utilities	Fixed	Carry $2,500/month as a stable monthly planning load.	Treating the full utility bill as per-test spend.
Clinical Laboratory Improvement Amendments (CLIA) Compliance & Accreditation Fees	Fixed	Add $1,000/month to fixed overhead for required lab compliance.	Moving compliance fees up and down with test volume.
Clinical Payroll	Semi-fixed	Model salaries in FTE blocks because staffing steps up by year as capacity grows.	Treating full lab staffing as variable per test.
Reagents & Consumables	Variable	Apply 10.0% of revenue in the first year, declining to 8.0% by Year 5.	Treating reagents as fixed overhead.
Sample Collection & Logistics	Variable	Apply 4.0% of revenue in the first year, tied to pickup and sample volume.	Treating courier routes as purely fixed.
IT Support & Software Licenses (Usage-based)	Semi-variable	Apply 2.0% of revenue in the first year and separate it from fixed admin software.	Combining usage fees with subscriptions and hiding volume drag.
Sales Commissions & Referral Fees	Variable	Apply 3.0% of revenue in the first year, declining to 2.5% by Year 5.	Budgeting referral spend as a flat monthly line.

How does break-even change from lean to base to full for a clinical laboratory?

Scenario table

Break-even shifts fast because revenue mix, variable cost share, and fixed payroll all move together. The lean case is basically at break-even, the base case throws off a wide cushion, and the full case absorbs overhead easily.

Planning figures only: these scenario outputs are assumptions, not guarantees.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean lab setup	$90,133	$17,125	$73,008	81%	$0	Essentially break-even, with almost no cushion.
Year 1 run-rate base case	$278,875	$52,986	$73,008	81%	$152,881	Clear monthly cushion, so fixed costs are covered well.
Year 5 scaled full case	$2,664,990	$399,749	$146,133	85%	$2,119,109	Strong overhead absorption, with break-even risk very low.

What breaks the break-even plan for a clinical laboratory?

Stress test

The plan is most exposed to reimbursement cuts, reagent inflation, and fixed payroll that arrives before specimen volume. A 10% revenue drop still leaves a cushion, but 24% variable costs or 15% higher overhead push break-even up fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$90,135	$188,741 cushion	Healthy on paper, but volume still has to ramp.
Revenue shortfall	Revenue falls 10% to about $250,988.	$90,135	$160,853 cushion	A 10% sales miss is still absorbable, but the cushion shrinks fast.
Fixed-cost pressure	Monthly overhead rises 15% to about $83,959.	$103,653	$175,223 cushion	Fixed payroll and rent are the first strain point because they move before volume does.
Margin pressure	Variable expenses rise from 19% to 24%, cutting contribution margin to 76%.	$96,063	$182,813 cushion	Reimbursement pressure or reagent inflation pushes break-even higher even if sales hold.
Combined pressure	Revenue falls 10%, variable expenses rise to 24%, and fixed costs rise 15%.	$144,188	$106,800 cushion	This is the real stress case: the lab still clears break-even, but the buffer gets much thinner.

Before you sign the lease, is this lab’s break-even math real?

Founder checklist

Only lock the lease if signed or highly probable specimen sources can support about $90,133 in monthly revenue and the Year 1 cost base stays near $73,008 a month. Here’s the quick test: demand first, then staffing, then equipment.

1Specimen Sources$90.1K/mo

Confirm signed or highly probable specimen sources can support about $90,133 in monthly revenue, or roughly 4,545 tests a month, before you lock the lease.

2Fixed Costs$73.0K/mo

Check that rent, utilities, compliance, insurance, software, services, and Year 1 payroll really total about $73,008 a month.

3Contribution Margin81% CM

Verify the Year 1 test mix keeps variable costs near 19% of revenue, so contribution stays around 81% before fixed overhead.

4Staff Coverage10 roles

Confirm the opening team can cover 1 lab director, 3 lab scientists, 2 phlebotomists, 2 technicians, 1 quality control specialist, and 1 pathologist without turnaround slipping.

5Cash Cushion$176K

Keep at least the Month 3 minimum cash need of $176,000 because capex lands early and the lab is not cash-positive right away.

6Capex TimingMonth 1-4

Stage the analyzer, molecular platform, storage, IT, and backup power buys across Month 1 to Month 4 so cash is not trapped in idle equipment.