Smog Check Station Break-Even: About $199K Monthly Revenue

Fixed costs $6.15K/mo Monthly base

Contribution margin 90.5% After variable costs

Break-even revenue $6.8K/mo Revenue threshold

Break-even timing Month 2 Early ramp

Break-even calculator

Use this calculator to test monthly revenue, variable expenses, and fixed costs against break-even for a smog check station.

Lean Base Full

Monthly revenue Use the monthly sales total; it sets the pool available to cover variable and fixed costs. $ Slow month Busy month Variable expenses Use direct costs that rise with more tests, like fees, supplies, and marketing. $ Low costs High costs

Money available to cover fixed costs $46,692 $51,593 revenue - $4,901 variable expenses

Margin ratio

91%

Covers fixed costs

Yes

Fixed monthly costs Use the monthly overhead the shop must cover before profit starts. $ Lean shop Heavy overhead

Break-even chart Revenue Total costs

Which smog station expenses are fixed, and which move with inspection volume?

Cost classification

Break-even is only useful if each expense behaves the right way in the model. Treat lease and payroll like per-test costs, and Month 2 break-even can look safer than it is.

Expense	Cost	Break-Even Treatment	Common Mistake
Facility Lease	Fixed	Keep the $3,500 monthly lease in fixed overhead for the full planning range.	Spreading rent across each inspection and hiding idle capacity.
Business Insurance	Fixed	Model the $300 monthly premium as fixed unless coverage changes.	Reducing insurance when monthly test volume drops.
Core Software Subscriptions	Fixed	Carry the $400 monthly subscription as fixed operating overhead.	Treating required software as if it rises with each test.
Annual Equipment Calibration Contracts	Fixed	Use the $500 monthly contract amount as fixed break-even overhead.	Classifying calibration as a per-test charge instead of a standing requirement.
State Certificate Fees Paid	Variable	Apply the first-year 1.5% of revenue rate directly against inspection sales.	Using a flat monthly estimate and missing revenue-linked movement.
Test Consumables & Supplies	Variable	Apply the first-year 1.0% of revenue rate as volume-driven supply expense.	Budgeting supplies as fixed even when inspection count changes.
Utilities	Semi-variable	Start with the $800 monthly base, then watch for usage pressure as lanes run harder.	Assuming the whole utility bill is fixed at higher throughput.
Certified Smog Technician	Semi-fixed	Step payroll from 1.0 full-time employee in the first year to 2.0 in the second year.	Treating technician payroll as a per-test expense instead of a staffing step.

How does break-even change across lean, base, and full smog station formats?

Scenario table

Break-even swings mostly with volume and staffing. Lean stays below the monthly threshold, base clears it, and higher throughput gives the widest cushion. The catch is simple: more technicians and overhead help only if demand is already there.

Planning assumptions only; actual results will move with demand, mix, and staffing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean smog station	$168k	$16k	$180k	90.5%	-$28k	Below the $199k monthly threshold, so cash stays tight.
Base smog station	$240k	$23k	$180k	90.4%	$37k	Clears the threshold and turns the model profitable.
Higher-throughput smog station	$514k	$41k	$320k	92.0%	$153k	Far above break-even, but only if demand supports added coverage.

What breaks the break-even plan for a smog check station?

Stress test

The plan holds in the base case, but demand is the first thing that can knock it off track. Payroll is the bigger danger: once Year 2 staffing lands, the break-even bar jumps, and a weak month can move from cushion to gap fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$203,000	$37,000 cushion	The base case clears fixed costs, but the cushion is still tight.
Revenue shortfall	Monthly inspections fall to 344.	$203,000	$28,000 gap	Fewer than 405 inspections leaves rent and labor uncovered.
Fixed-cost pressure	Year 2 staffing lifts fixed monthly costs to about $226,000.	$248,000	$8,000 gap	Payroll pushes break-even above the current plan.
Margin pressure	Variable expenses rise by 1 percentage point.	$203,240	$36,760 cushion	A small margin loss trims cushion, even before demand weakens.
Combined pressure	Monthly inspections fall to 344 and Year 2 staffing is in place.	$248,000	$74,000 gap	Weak demand plus higher payroll can turn the month negative fast.

Can this smog station clear about 405 inspections a month before you sign the lease?

Founder checklist

Before you lock in the site, test the break-even load against real demand, staffing, and cash needs. If the lane, team, or customer mix can’t support about 405 inspections a month, the lease is too early.

1Lane Flow405/mo

Confirm the bay, queue, and parking can move about 405 inspections a month without bottlenecks, because that is the break-even pace.

2Pricing Mix$49.99-$99.99

Check that local demand supports standard, diesel, heavy duty, mobile, and re-test pricing, or lower-price work will push the volume target higher.

3Staffing Load$142.5K/yr

Verify Year 1 coverage for one lead technician, one certified technician, and 0.5 admin FTE before you add the second certified tech.

4Launch Capex$145K

Make sure the equipment, software, leasehold work, and setup can be funded before opening, since the launch build totals $145,000.

5Fixed Overhead$18.0K/mo

Stress-test rent, utilities, insurance, software, calibration, supplies, and accounting against the monthly fixed load, because overhead sets the break-even line.

6Cash Runway$788K

Keep reserve cash separate from operating break-even and confirm you can fund the $788,000 minimum cash need through Month 25.