Germicidal UV Systems Break Even At About $645K/Month

Fixed costs $78.5K/mo Month 30 base

Contribution margin 74% After variable costs

Break-even revenue $105.8K/mo Monthly target

Break-even timing Month 30 Breakeven month

Break-even calculator

Use this calculator to test monthly revenue against variable expenses and fixed monthly costs for a germicidal UV light systems business.

Lean Base Full

Monthly revenue Revenue is the monthly sales total before direct costs. $ Slow month Strong month Variable expenses Include direct costs that move with each job, like commissions, fuel, and install consumables. $ Lower cost Higher cost

Money available to cover fixed costs $82,671 $111,417 revenue - $28,746 variable expenses

Margin ratio

74%

Covers fixed costs

Yes

Fixed monthly costs Include rent, payroll, insurance, software, and other monthly overhead. $ Lean overhead Heavy overhead

Break-even chart Revenue Total costs

Which expenses are fixed, and which move with UV system sales and service work?

Cost classification

Classifying these expenses correctly keeps break-even revenue from looking safer than it is. In the first year, 14% hardware, 4% consumables, 7% commissions, and 3% vehicle costs reduce contribution before fixed overhead.

Expense	Cost	Break-Even Treatment	Common Mistake
Warehouse and Office Rent	Fixed	Include $5,500 per month in overhead, regardless of project count.	Tying rent to job volume and understating the monthly revenue floor.
UV Lamps and Hardware Components	Variable	Reduce contribution margin by 14% of first-year revenue.	Treating stocked units as profit before the installed sale is complete.
Direct Installation Consumables	Variable	Reduce contribution margin by 4% of first-year revenue.	Leaving small field materials out because each item feels minor.
Sales Commissions and Incentives	Variable	Reduce contribution margin by 7% of first-year revenue.	Counting gross sales as available cash before commissions are paid.
Lead Installation Tech Salary	Semi-fixed	Add $72,000 in the first year before the crew is fully booked.	Spreading salary across jobs that have not been sold yet.
Vehicle Fuel and Maintenance	Variable	Reduce contribution margin by 3% of first-year revenue as field work rises.	Budgeting it as flat overhead while route volume grows.
Warranty Support and Service Callbacks	Semi-variable	Model a base service load that rises as the installed base grows.	Assuming every completed install has no follow-up labor.

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

Scenario table

Revenue grows faster than variable costs as the mix shifts toward maintenance, so margin improves. Fixed overhead also rises with crew and sales coverage, but the base and full cases have more room to absorb it.

Planning cases only; actual break-even will move with close rate, crew use, and service mix.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean UV launch	$34.1k	$9.5k	$51.6k	72.0%	$-27.1k	Still short of break-even; the model runs about $27k/month in the red.
Base UV ramp	$111.4k	$28.7k	$78.5k	74.2%	$4.2k	Just over break-even; small profit means the business needs steady install throughput.
Full UV growth buildout	$230.8k	$54.4k	$114.6k	76.4%	$61.8k	Clear coverage; higher volume creates a solid cushion above break-even.

What breaks the break-even plan for germicidal UV light systems?

Stress test

At the Year 3 run rate, the model has some cushion, but not much. A 10% revenue dip, a 10% jump in fixed overhead, or a 5-point margin hit can erase it; stacked together, they push monthly profit to about a $45k loss.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$906k	$208k cushion	Cushion exists, but labor and warranty are the watch items.
Revenue shortfall	Revenue falls 10% to $1,003k.	$906k	$97k cushion	A sales miss cuts the cushion fast.
Fixed-cost pressure	Fixed overhead rises 10% to $739k.	$996k	$118k cushion	Headcount or overhead creep bites first.
Margin pressure	Margin slips 5 points to 69.2%.	$971k	$143k cushion	Cost creep or discounting eats the spread.
Combined pressure	Revenue drops 10%, fixed overhead rises 10%, and margin slips 5 points.	$1,068k	$65k gap	Labor overruns, freight, discounting, rework, and warranty calls can flip profit to loss.

What should you verify before locking in warehouse, hiring, and inventory for a UV light system business?

Founder checklist

Before you lock in fixed spend, make sure demand can carry the model. Year 1 EBITDA is negative, and cash still bottoms at $179K in Month 30, so the first test is whether lead flow, install pace, and capex timing can reach break-even on schedule.

1Lead flow$2.5K CAC

Use the $45K Year 1 marketing test to see if customer cost stays near $2,500 and leads turn into real install quotes.

2Overhead load$9.35K/mo

Do not sign the $5,500 monthly warehouse lease unless backlog can cover the full fixed load, because rent, insurance, software, utilities, renewals, and supplies already run about $9.35K a month before payroll.

3Contribution margin72% CM

Here’s the quick math: hardware, consumables, commissions, and fuel total about 28% of revenue, so each dollar sold leaves about 72 cents before payroll and rent.

4Crew capacity40 hrs/install

Verify one install crew can handle the opening load, since a UV System Install uses about 40 billable hours at $165 per hour and the lead tech starts at 1.0 FTE.

5Launch capex$221.5K

The launch build totals about $221.5K, including $95K for service vehicles and $45K for initial inventory, so check supplier timing before you lock the spend.

6Cash trough$179K

Keep cash ready for the Month 30 trough, because minimum cash falls to about $179K and EBITDA stays negative through Year 2 before turning positive in Year 3.