Biometric Security Systems Break-Even Analysis: $97K/Month Target

Fixed costs $64.6K/mo Monthly base

Contribution margin 66.5% After variable cost

Break-even revenue $97.1K/mo Needed monthly sales

Break-even timing Month 6 Model ramp point

Break-even calculator

Test whether monthly revenue covers direct costs and overhead for a biometric security systems business.

Lean Base Full

Monthly revenue Revenue is the cash that covers direct costs and overhead. $ Low sales High sales Variable expenses Use costs that rise with each install, service call, or support job. $ Lean costs High costs

Money available to cover fixed costs $96,425 $145,000 revenue - $48,575 variable expenses

Margin ratio

66%

Covers fixed costs

Yes

Fixed monthly costs Use overhead you pay even when sales slow down. $ Light overhead Heavy overhead

Break-even chart Revenue Total costs

Which expenses are fixed and which move with sales for a biometric access installer?

Cost classification

Break-even works only if each expense follows its real behavior. Treat hardware, materials, subcontract labor, and fuel as volume-linked, while rent, insurance, software, payroll, and baseline marketing sit in overhead.

Expense	Cost	Break-Even Treatment	Common Mistake
Year 1 salaries	Semi-fixed	Include $542k of first-year payroll as monthly overhead, then step it up when roles or headcount expand.	Treating all technician and support payroll as if it rises one-for-one with each job.
Software subscriptions	Fixed	Carry $650 per month in fixed overhead for the full Month 1 to Month 60 planning range.	Spreading software as a percent of sales and overstating margin gains at higher volume.
Biometric hardware components	Variable	Model as direct COGS at 18% of first-year revenue, falling to 15% by the mature year.	Putting hardware in overhead, which makes each new sale look too profitable.
Installation materials and supplies	Variable	Use 4% of first-year revenue, improving to 3% by the mature year as purchasing gets tighter.	Using a flat monthly allowance even though parts and supplies follow install volume.
Installation labor subcontractors	Variable	Apply 8% of first-year revenue, declining to 6% by the mature year as internal capacity grows.	Counting subcontractors as fixed payroll and hiding the true gross margin per project.
Vehicle fuel and maintenance	Variable	Model at 3.5% of first-year revenue, improving to 2.5% by the mature year.	Ignoring route density, then underpricing service calls and maintenance visits.
Office and warehouse rent	Fixed	Carry $4,500 per month as fixed overhead across the operating break-even model.	Allocating rent to each install and assuming it disappears when sales slow.
Marketing budget	Fixed	Use the first-year budget of $120k, or $10k per month; treat the $800 CAC as a performance metric.	Adding CAC as a second expense on top of the approved marketing budget.

How does break-even change from lean to base to full biometric launch?

Scenario table

Break-even moves from about $80.9k a month in lean launch to $115k in the base case and $186.8k at full capacity. The margin improves as maintenance attach rises and subcontract labor falls, but each step adds fixed payroll that lifts the revenue hurdle.

Planning assumptions only; break-even figures are monthly equivalents, not guarantees.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch	$80.9k	$27.1k	$53.8k	66.5%	$0	Lowest overhead, but a slow month can miss break-even.
Base rollout	$115k	$36.3k	$78.7k	68.4%	$0	Better margin from service attach, but overhead is heavier.
Full-capacity build	$186.8k	$49.5k	$137.3k	73.5%	$0	Strongest margin, yet the highest monthly revenue hurdle.

What breaks first if sales slow or costs creep up?

Stress test

The plan is fragile because it starts at break-even. A 10% revenue miss or a 10% fixed-cost jump creates about a $65k annual loss, and if variable costs rise 5 points too, the loss grows to about $173k.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change; revenue and costs stay at plan.	$971,000	$0 gap	No cushion, so any delay hits cash fast.
Revenue shortfall	Revenue falls 10% to $873,900.	$971,000	$97,100 gap	A 10% sales miss turns into about a $65k annual loss.
Fixed-cost increase	Fixed costs rise 10% to $710,600.	$1,068,000	$97,000 gap	Overhead creep alone adds about a $65k annual loss at plan revenue.
Margin pressure	Variable expenses rise 5 points to 38.5% of revenue.	$1,050,000	$79,000 gap	Hardware above 18% or subcontract labor above 8% pushes break-even past $1.0M.
Combined pressure	Revenue falls 10%, fixed costs rise 10%, and variable expenses rise 5 points.	$1,155,000	$281,000 gap	That combo drives about a $173k annual loss and strains cash before break-even.

Can you prove installs, cash, and lead flow before you lock in the lease and fleet?

Founder checklist

Don't sign the lease until booked installs and cash cover the first fixed-cost stretch. This model needs Month 6 breakeven and a $640K cash floor in Month 5, so sell first, then add rent, vehicles, and headcount.

1Demand Proof$800 CAC

Verify qualified pipeline can hold customer acquisition cost (CAC) near $800 while the $120K Year 1 marketing budget turns into booked installs, not just clicks.

2Lease Load$646K Base

Verify the $4,500 monthly rent fits the $646K fixed-cost base and still leaves room to reach breakeven without stretching sales.

3Project Margin66.5% CM

Verify year 1 jobs keep about 66.5% contribution after 18.0% hardware, 4.0% materials, 8.0% install labor, and 3.5% vehicle cost.

4Tech Ramp3 FTE

Verify three installation technicians can cover booked work before Month 6, because breakeven only works if installs keep pace with sales.

5Cash Buffer$640K M5

Verify cash stays above the $640K minimum in Month 5, since the model does not reach breakeven until Month 6.

6Demo Stock$20K Demo

Verify the $20K demo-unit buy and supplier lead times match qualified demand, so you only promise install dates you can hit.