Performance Tuning Break-Even: $23K Monthly Shop Revenue

Fixed costs $17.7K/mo Base monthly overhead

Contribution margin 80% After variable costs

Break-even revenue $22.2K/mo Revenue target

Break-even timing Month 4 Launch break-even

Break-even calculator

Test how monthly revenue, variable shop costs, and fixed overhead stack up against break-even for a performance tuning business.

Lean Base Full

Monthly revenue Revenue sets how much margin is left after direct costs. $ Low sales High sales Variable expenses Use direct costs that move with each job and sale. $ Light costs Heavy costs

Money available to cover fixed costs $61,334 $76,667 revenue - $15,333 variable expenses

Margin ratio

80%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base the shop must cover. $ Small base Big base

Break-even chart Revenue Total costs

Which performance tuning shop expenses are fixed, and which move with sales?

Cost classification

Break-even works only if each expense follows the right behavior. Treat rent and core salaries as overhead, but model parts, licenses, marketing, and supplies as revenue-linked charges.

Expense	Cost	Break-Even Treatment	Common Mistake
Workshop Rent	Fixed	Include $4,000 in monthly overhead.	Tying rent to job count.
Business Insurance	Fixed	Include $500 in monthly overhead.	Treating insurance as per-car.
Lead Tuning Technician salary	Fixed	Include the $100,000 annual salary in overhead.	Calling booked technician hours pure variable margin.
Service Advisor / Admin salary	Fixed	Include the $45,000 annual salary in overhead.	Burying admin labor outside break-even.
Aftermarket Parts Cost	Variable	Use 10% of revenue in the first year.	Using sales revenue as if it were margin.
ECU Tuning Software Licenses	Variable	Use 3% of revenue in the first year.	Ignoring license drag on each sale.
Utilities	Semi-variable	Start with $800 monthly, then watch dyno usage load.	Assuming power use stays flat at higher volume.
Marketing & Advertising	Variable	Use 5% of revenue and track the $250 CAC.	Assuming every lead converts into a paying job.

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

Scenario table

Break-even rises as the shop adds technicians and support staff, because fixed payroll grows faster than the margin. The real test is whether booked labor hours and dyno use stay high enough to cover that larger monthly cost base.

Planning assumptions only; actual break-even will move with mix, labor load, and demand.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch	$232k	$46k	$185k	80%	$1k	Near break-even; small booking gaps matter.
Base growth	$384k	$66k	$319k	82.9%	-$1k	Needs steady demand to cover the larger payroll base.
Full capacity	$439k	$62k	$377k	85.8%	$0	Works only if labor, dyno, and installs stay full.

What breaks this tuning shop's break-even plan?

Stress test

The plan is thinly protected, so a small drop in bookings can flip profit to loss. Higher fixed payroll or weaker margin from discounting and parts cost spikes pushes break-even up fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change; revenue stays at $232,000.	$231,250	$750 cushion	Only a small cushion separates profit from loss.
Revenue shortfall	Revenue falls 10% to $208,800.	$231,250	$22,450 gap	A 10% booking drop wipes out the cushion fast.
Fixed-cost pressure	Fixed costs rise 10% to $203,500.	$254,375	$22,375 gap	Higher payroll or overhead raises the break-even floor.
Margin pressure	Variable expenses rise from 20% to 25%.	$246,667	$14,667 gap	Discounting or higher parts cost squeezes margin.
Combined pressure	Revenue drops 10%, fixed costs rise 10%, and margin falls to 75%.	$271,333	$62,533 gap	Weak bookings plus cost pressure can create about a $47,000 monthly operating loss.

Can you carry the shop load before you sign the lease and buy the dyno?

Founder checklist

Before you commit, test whether bookings can cover the fixed load and the early cash dip. If the Month 4 break-even path does not hold against the $793k minimum cash need in Month 2, slow down.

1Fixed load$18.5K/mo

Confirm the shop can carry about $18.5k a month in fixed cost, including $6,450 of overhead and $145k of Year 1 wages spread monthly, before you sign a long lease.

2Cash cushion$793K

Keep enough cash to survive the Month 2 trough, because the model bottoms at $793k minimum cash while the $155k capex buildout is still hitting.

3Lease fit5-site fit

Verify the space can handle dyno work, lifts, ventilation, storage, and customer parking, or the buildout will stall and the launch will slip.

4Lead flow200 customers

Test paid demand against the $50k Year 1 marketing budget and $250 CAC, which buys about 200 customers if conversion stays on plan.

5Margin check80% CM

Make sure parts, ECU software licenses, shop supplies, and variable marketing stay near 20% of revenue so contribution margin stays around 80% before fixed payroll.

6Staffing ramp1+1 FTE

Map jobs to 3-hour remaps, 8-hour dyno work, 6-hour installs, and 2-hour diagnostics, then hold at one lead tech and one admin until bookings justify more hires.