Custom Car Manufacturing Break-Even: $198K Monthly Revenue

Fixed costs $87.0K/mo Overhead base

Contribution margin 85% After variable costs

Break-even revenue $102.8K/mo Monthly target

Break-even timing Month 1 EBITDA positive

Break-even calculator

Use this calculator to test monthly revenue against variable expenses and fixed costs.

Lean Base Full

Monthly revenue Revenue sets the margin available to cover fixed costs. $ Low revenue High revenue Variable expenses These are direct costs that rise as more cars are sold. $ Low direct costs High direct costs

Money available to cover fixed costs $1,140,154 $1,262,500 revenue - $122,346 variable expenses

Margin ratio

90%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly overhead that contribution margin must cover. $ Low overhead High overhead

Break-even chart Revenue Total costs

Which custom car manufacturing expenses are fixed, and which move with sales?

Cost classification

Break-even only works if each expense follows its real driver. Treat stable shop overhead as fixed, completed-build costs as variable, and capacity payroll as semi-fixed so the model doesn’t overstate margin.

Expense	Cost	Break-Even Treatment	Common Mistake
Workshop & Design Studio Rent	Fixed	Use $35,000 per month in the monthly overhead base.	Spreading rent per vehicle and making low-volume months look too profitable.
Proprietary Software Subscriptions	Fixed	Use $12,000 per month as recurring operating overhead.	Treating subscriptions like build materials instead of capacity support.
Insurance, property and liability	Fixed	Use $6,000 per month unless coverage limits change with scale.	Ignoring it because it is not tied to a single customer build.
Fixed Marketing & Brand Building	Fixed	Use $15,000 per month as committed demand-generation spend.	Classifying all marketing as sales-driven when this line is fixed.
Finishing, assembly, inspection, delivery prep, and warranty provision	Variable	Apply $150,000 to $270,000 per completed vehicle, based on build tier.	Burying craft labor, testing, delivery prep, or warranty inside overhead.
Sales Commissions	Variable	Apply 4.0% of revenue in the first year, declining to 3.0% by Year 5.	Modeling commissions as a flat monthly amount instead of sales-linked.
Utilities and Factory Utility Load	Semi-variable	Use the $8,000 monthly base plus the 0.5% factory utility load tied to revenue.	Putting the full utility bill in fixed overhead and missing usage drag.
Skilled design, engineering, production, and client staffing	Semi-fixed	Step payroll with capacity; first-year staffing totals $965,000 per year, about $80,400 per month.	Assuming payroll rises smoothly per vehicle instead of in hiring blocks.

How do lean, base, and full custom build plans change break-even?

Scenario table

Break-even rises as the plan adds higher-paid staff and more fixed overhead, but the mix also shifts toward higher-value builds, which lifts margin. Here’s the quick math: lean breaks around $198K a month, base around $242K, and full around $281K.

Planning scenarios only; these figures are sizing inputs, not lender-grade forecasts or guarantees.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch plan	$333K	$614K	$167K	84.6%	$115K	Covers the ~$198K break-even mark with some cushion.
Base growth plan	$738K	$1.30M	$207K	85.3%	$422K	Still above break-even, so hiring must stay tied to booked volume.
Full capacity plan	$1.95M	$3.16M	$243K	86.5%	$1.45M	Strong cushion, but shop throughput and suppliers become the main risk.

What breaks first if revenue slips or costs rise in this custom car manufacturing plan?

Stress test

The plan clears break-even now, but the cushion is not wide. A 25% revenue dip, a 5-point margin hit, or a 10% fixed-cost jump can shrink room fast; delayed deposits, rework, and idle payroll are the first warning signs.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	First-year revenue stays at about $333K per month.	$198K	$135K cushion	Has room, but late deposits can still squeeze cash.
Revenue shortfall	Monthly revenue drops 25% to about $250K.	$198K	$52K cushion	Less top-line flow leaves little room for schedule slip.
Fixed-cost increase	Fixed costs rise 10% from about $167K to about $184K.	$218K	$115K cushion	Higher overhead pushes the break-even bar up fast.
Margin pressure	Margin falls 5 points from 84.65% to 79.65%.	$210K	$123K cushion	Rework, overtime, or supplier price hikes can erase margin.
Combined pressure	Revenue falls 25%, margin drops 5 points, and fixed costs rise 10%.	$231K	$19K cushion	Three hits together leave almost no room for delay.

What should you verify before signing the workshop lease and locking the launch cost structure?

Founder checklist

Before you sign the lease, verify that the first-year plan really supports 2 completed units and about $4.0M of revenue with booked work, not hope. Also make sure the roughly $165K monthly fixed load and the Month 6 cash trough of negative $1.772M are funded.

1Demand Proof2 units / $4.0M

Verify signed orders or deposits can support the first-year plan, because the fixed-cost stack only works if demand is already real.

2Fixed Load$165K/mo

Check that monthly fixed expenses and Year 1 payroll fit the margin, or the shop can look busy and still burn cash.

3Build Margin$150K-$270K

Confirm deposits and progress billings cover each unit’s build cost, so parts, labor, and warranty cash do not outrun collections.

4Capex Cover$3.60M

Fund the full startup capex plan before leaning on operating cash, since equipment, software, and test gear hit before the first deliveries close.

5Cash TroughMonth 6

Keep reserve money ready for the Month 6 low of negative $1.772M, because delivery cash arrives after the upfront spend.

6Staff Ramp6.5 FTE

Hire against booked work, not hope, and match the Year 1 team to the build schedule so labor does not outrun demand.