Liquid Penetrant Testing Service Break-Even: $58K/Month

Fixed costs $7.6K/mo Monthly overhead

Contribution margin 71% After variable costs

Break-even revenue $10.6K/mo Revenue needed

Break-even timing Month 9 Model breakeven

Break-even calculator

Test monthly revenue against variable expenses and fixed costs to see where this service breaks even.

Lean Base Full

Monthly revenue Revenue sets the margin available to cover fixed costs each month. $ Low revenue High revenue Variable expenses Use direct costs that rise with jobs, like consumables, calibration, fuel, and commissions. $ Low costs High costs

Money available to cover fixed costs $100,761 $137,083 revenue - $36,322 variable expenses

Margin ratio

74%

Covers fixed costs

Yes

Fixed monthly costs Use monthly overhead that stays in place, like lease, payroll, software, insurance, and utilities. $ Low overhead High overhead

Break-even chart Revenue Total costs

Which liquid penetrant testing expenses are fixed, and which move with sales?

Cost classification

Break-even is reliable only when monthly overhead is kept separate from per-job inputs. With break-even at Month 9, misclassifying technician payroll or mobile travel can make the revenue target look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Lab Facility Lease	Fixed	Include $4,500 per month in base overhead before calculating required inspection revenue.	Spreading rent across jobs and hiding the true monthly nut.
Professional Liability Insurance	Fixed	Include $1,200 per month as recurring overhead from Month 1 through Month 60.	Treating insurance as job-driven because higher-risk work feels variable.
Software and Report Portal Hosting	Fixed	Include $650 per month as stable operating overhead for reporting and customer access.	Leaving it below the line instead of in operating break-even.
Dye Penetrant Consumables	Variable	Model at 12% of first-year revenue, declining to 10% by the mature year.	Using a flat dollar amount when material use rises with inspection volume.
Third Party Calibration Fees	Variable	Model at 4% of first-year revenue, falling to 3% by the mature year.	Burying calibration in overhead when testing activity drives the spend.
Fuel and Vehicle Maintenance	Semi-variable	Start with the 8% first-year assumption, then check routing, service radius, and field-job mix.	Burying travel inside overhead when mobile jobs drive fuel and maintenance.
NDT Technician Level II Payroll	Semi-fixed	Add payroll in FTE steps: 2.0 in the first year, rising to 6.0 by the mature year.	Treating salaried technicians as purely Variable and understating idle capacity risk.
Administrative Assistant Payroll	Semi-fixed	Add support payroll when the role starts in Month 13 at 1.0 FTE.	Forgetting the Month 13 step-up and overstating second-year margin.

How does break-even change from a lean launch to base recurring work and full capacity?

Scenario table

As billable hours and technician count rise, revenue grows faster than fixed overhead, so break-even risk falls. The lean case is still tight, the base case clears the line, and the full case builds cushion.

Planning assumptions only; actual break-even will move with utilization, travel, and customer mix.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$51.2K	$14.8K	$46.0K	71%	-$9.7K	Month 9 is the first break-even point, but Year 1 still ends negative.
Base recurring-service case	$97.2K	$27.0K	$63.0K	72.2%	$7.3K	Break-even is cleared and monthly profit turns positive.
Full-capacity case	$238.8K	$57.3K	$101.5K	76%	$80.0K	Scale works if technician utilization and route density hold.

What breaks the break-even plan for a liquid penetrant testing service?

Stress test

The plan is most fragile if booked hours slip, emergency travel goes unpriced, or rework and consumable waste rise. A 10% revenue miss or a 5-point margin drop can push the business past break-even fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change from the base plan.	$512,000	$0 gap	Any miss starts eating cash.
Revenue shortfall	Booked revenue falls 10% to $461,000.	$512,000	$51,000 gap	A small miss wipes out the buffer.
Fixed-cost pressure	Fixed overhead rises 10% to $455,000.	$641,000	$129,000 gap	Lease, labor, or admin creep needs more sales.
Margin pressure	Variable expenses rise from 29% to 34%.	$627,000	$115,000 gap	Travel, consumables, or commissions are too high.
Combined pressure	Revenue falls 10%, fixed costs rise 10%, and variable expenses rise to 34%.	$689,000	$228,000 gap	This mix blows past the buffer fast.

What should you prove before you sign the lease and buy launch gear for this liquid penetrant testing service?

Founder checklist

Before you lock in the lease, hiring, and launch capex, prove the service can carry the Year 1 load. The model needs enough demand, pricing, staffing, and cash to hit Month 9 break-even and survive the Month 18 cash low.

1Demand proof$58.2K/mo

Verify the pipeline can support about 301 billable hours a month at the first-year blended rate before you add fixed overhead.

2Price mix$193.50/hr

Check that the 40% aerospace, 35% industrial forgings, and 25% emergency field service mix really holds the blended hourly rate.

3Fixed load$37.6K/mo

Make sure lease, insurance, software, membership, utilities, and Year 1 wages stay inside the monthly run rate the model can carry.

4Tech coverage2.0 FTE

Confirm Level II technician coverage and certification before quoting regulated work, because Year 1 depends on two technician FTE plus QA support.

5Launch spend$45K / $135K

Test the Year 1 marketing budget and the $135K capex package together, and delay optional spend if Month 9 break-even slips.

6Cash cushion$684K

Hold enough cash to reach the Month 18 low point, because the model’s payback is 39 months and the early curve is still tight.