Sensor Integration Service Break-Even Analysis: $166K/Month

Fixed costs $111.5K/mo Payroll plus overhead

Contribution margin 74.5% After variable costs

Break-even revenue $149.7K/mo Monthly target

Break-even timing Month 9 Launch ramp

Break-even calculator

Test how monthly revenue, variable costs, and fixed overhead compare with break-even.

Lean Base Full

Monthly revenue Revenue sets the pool that pays variable costs and fixed overhead. $ Low sales High sales Variable expenses Include direct costs that rise with each project or contract. $ Low direct cost High direct cost

Money available to cover fixed costs $396,012 $503,833 revenue - $107,821 variable expenses

Margin ratio

79%

Covers fixed costs

Yes

Fixed monthly costs Include rent, salaries, software, and other recurring overhead. $ Light overhead Heavy overhead

Break-even chart Revenue Total costs

Which sensor integration expenses are fixed, and which move with sales?

Cost classification

Break-even is only reliable when recurring overhead stays separate from project-driven expenses. If you treat salaried engineering time as free, the Month 9 break-even target can look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Office Rent	Fixed	Include $12,000 per month in fixed overhead from Month 1 through Month 60.	Spreading rent across projects and hiding the monthly hurdle.
R&D Platform Development	Fixed	Include $20,000 per month before calculating contribution margin.	Treating platform work as optional because it is not tied to one client job.
Year 1 Salaried Payroll	Fixed	Include $870,000 annually, or about $72,500 per month, as recurring capacity expense.	Treating salaried engineering capacity like zero-cost labor.
Sensor & Hardware Components	Variable	Apply 12.0% of revenue in the first year, falling to 8.0% by the mature year.	Using a flat dollar estimate instead of tying parts to project revenue.
Cloud Platform Hosting Fees	Variable	Apply 4.0% of revenue in the first year, declining to 2.5% by the mature year.	Putting hosting fully in fixed overhead when usage rises with deployed systems.
Sales Commissions	Variable	Apply 7.0% of revenue in the first year, declining to 5.0% by the mature year.	Forgetting commissions when modeling new customer revenue from paid marketing.
Payment Processing Fees	Variable	Apply 2.5% of revenue in the first year and second year, then step down to 2.0% by Year 5.	Rounding small percentages away even though they reduce every dollar of contribution.
Technical Support Specialist Hiring	Semi-fixed	Add salary in staffing steps as support headcount moves from 0.0 FTE in Year 1 to 3.0 FTE in Year 5.	Modeling support as perfectly variable instead of adding people in hiring blocks.

How does break-even move from a lean pilot to full capacity?

Scenario table

Break-even moves with revenue scale and staffing. The lean case is short of cover, the base case sits at the line, and the full case adds cushion because revenue grows faster than fixed overhead.

Planning figures only; demand, rework, and utilization can move break-even.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean pilot	$143k	$36k	$124k	74.5%	-$18k	Still below break-even; it needs about $23k more monthly revenue.
Base case	$166k	$42k	$124k	74.7%	$0	At this level, overhead clears around Month 9.
Full-capacity case	$315k	$74k	$172k	76.5%	$69k	It gives a wider cushion, with break-even near $225k a month.

What breaks the break-even plan if sales slow or margins slip?

Stress test

Base break-even sits near $166,000 a month, but it moves fast if sales slip, overhead rises, or rework and travel eat margin. A 15% revenue miss or a 5-point margin drop is enough to create a real monthly gap.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change from the base plan.	$166,000/month	$0 gap	Any delay in bookings or collections pushes cash down.
Revenue shortfall	Revenue runs 15% below break-even, to about $141,000/month.	$166,000/month	$19,000 gap	A 15% miss leaves about $19k uncovered each month.
Fixed-cost increase	Overhead rises 10% to about $136,400/month.	$183,000/month	$17,000 gap	Overhead creep pushes the target past the current plan.
Margin pressure	Contribution margin falls 5 points to 69.5%.	$178,000/month	$12,000 gap	Rework, travel, and calibration push break-even higher.
Combined pressure	Revenue drops 15%, overhead rises 10%, and margin falls 5 points.	$196,000/month	$38,000 gap	Unpaid discovery work and long calibration cycles are the red flags.

What should you verify before locking in the first fixed-cost base for sensor integration?

Founder checklist

Before you lock in rent, hires, and lab spend, prove the backlog can carry the break-even load. This plan reaches breakeven in Month 9, so the first test is whether signed work, capacity, and cash can hold through Month 8.

1Signed Work$166K/mo

Verify signed integration work is near the $166,000 monthly break-even threshold before adding more fixed roles or the model will lean on hope instead of backlog.

2Office Rent$12K/mo

Keep the $12,000 monthly rent only if the office cuts site-visit time or supports delivery, because empty space just pushes breakeven farther out.

3Margin Mix74.5% CM

Keep sensor and hardware suppliers near 12% of revenue, and check that the rest of the variable stack still leaves a 74.5% contribution margin to cover fixed costs.

4Engineer Load120 hrs

Make sure the current engineer mix can cover 120 integration hours and 8 support hours, then track rework, calibration time, and site-visit load weekly before you add roles.

5Cash Cushion$271K

Protect the $271,000 cash floor through Month 8, since minimum cash hits there and early overruns can force a bad cut.

6Launch Spend$150K

Pace launch marketing against the $150,000 Year 1 budget and the $12,000 customer acquisition cost (CAC), because demand proof has to show up before the spend does.