Open-Source Software Break-Even Point: $596K/Month

Fixed costs $39.3K/mo Year 1 fixed base

Contribution margin 80% After variable costs

Break-even revenue $49.1K/mo Revenue target

Break-even timing Month 29 Forecast crossover

Break-even calculator

Use this to test monthly revenue, variable expenses, and fixed costs against break-even for an open-source software plan.

Lean Base Full

Monthly revenue Revenue sets the margin pool that covers fixed overhead. $ Low sales Strong sales Variable expenses Direct costs that rise with sales, like hosting, tooling, ads, and commissions. $ Light direct cost Heavy direct cost

Money available to cover fixed costs $64,000 $80,000 revenue - $16,000 variable expenses

Margin ratio

80%

Covers fixed costs

Yes

Fixed monthly costs This is the monthly cost base your margin has to cover. $ Small team Scaled team

Break-even chart Revenue Total costs

Which expenses stay fixed, and which move with paid customer activity?

Cost classification

Break-even is only reliable if fixed overhead is separated from revenue-linked costs. Here, Month 29 break-even depends on treating hosting, tooling, ads, and commissions as costs that rise with paid customer activity.

Expense	Cost	Break-Even Treatment	Common Mistake
Office Rent	Fixed	Enter $3,500 per month from Month 1 through Month 60 as baseline overhead.	Reducing rent per customer and hiding the real cash floor.
R&D Core Platform Maintenance	Fixed	Enter $6,000 per month as recurring platform upkeep before contribution margin.	Treating core maintenance like a growth project instead of monthly overhead.
CEO and Lead Software Engineer payroll	Fixed	Use $305,000 per year, or about $25,417 per month, in the first year fixed base.	Leaving founder and engineering salaries below the break-even line.
Cloud Infrastructure Hosting	Variable	Model as 8.0% of revenue in the first year, falling to 6.0% by the fifth year.	Treating cloud spend as pure overhead when usage rises with customers.
Third-Party API & Tooling Licenses	Variable	Model as 3.0% of revenue in the first year, falling to 2.0% by the fifth year.	Using one flat monthly number and missing paid usage growth.
Sales Commissions & Performance Bonuses	Variable	Apply 3.0% of revenue in the first year, stepping down to 2.0% by the fifth year.	Classifying commissions as fixed payroll instead of sales-linked spend.
Digital Advertising & Content Creation	Variable	Apply 6.0% of revenue in the first year, falling to 4.0% by the fifth year.	Double counting spend by modeling both CAC budget and revenue percentage without a clear rule.
Planned specialist hiring	Semi-fixed	Add headcount in steps: marketing in Year 2, sales in Year 3, support in Year 4, and DevOps in Year 5.	Smoothing hiring across every month and missing the cash hit when roles start.

How does break-even shift from a lean launch to a full buildout for this business?

Scenario table

Lean launch stays short because fixed costs outrun contribution. The base case is near the model’s Month 29 break-even, while the full buildout adds real cushion once paid conversion and support load improve.

Planning cases, not guarantees; actual break-even will move with conversion, mix, and staffing.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch	$400k	$80k	$393k	80.0%	$-73k	Founder-led sales still leave a monthly gap.
Base case	$600k	$120k	$477k	80.0%	$3k	Near break-even, so small misses can flip loss.
Full buildout	$1,250k	$212k	$847k	83.0%	$191k	Healthy cushion if paid conversion holds and support scales.

What breaks the break-even plan for this open-source software business?

Stress test

Break-even is tight: the base plan clears at about $596,000, so a 15% revenue miss creates about a $72,000 gap. Add $100,000 in fixed cost or let variable expenses rise to 25% of revenue, and the cushion disappears fast.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$596,000	$0 gap	Revenue just covers fixed cost.
Revenue shortfall	Revenue falls 15% to about $506,000.	$596,000	$72,000 gap	A small trial-to-paid miss pushes the model underwater.
Fixed cost pressure	Fixed cost rises by $100,000.	$721,000	$100,000 gap	Extra support or contractors push break-even higher.
Margin pressure	Variable expenses rise from 20% to 25% of revenue.	$635,000	$30,000 gap	Cloud, API, or tooling spend can erase the cushion.
Combined pressure	Revenue falls 15% and fixed cost rises $100,000.	$769,000	$197,000 gap	Low conversion plus higher support creates the sharpest cash strain.

What should you verify before you hire, scale ads, and commit to paid support?

Founder checklist

Before you add headcount or spend more on acquisition, make sure the funnel, pricing, and mix can carry the fixed base. In Year 1, fixed spend is about $47.7K per month, so the model needs roughly $59.6K in monthly revenue at an 80% contribution margin.

1Trial Flow3.5% / 18.0%

Verify visitors-to-trial stays near 3.5% and trial-to-paid near 18.0% before you scale ads, or CAC at $250 will stop paying back.

2CAC Target$250

Keep customer acquisition cost at or below the Year 1 target as marketing spend rises, because weak acquisition math will drag every paid seat.

3Paid Mix60/30/10

Hold the mix near 60% Community Edition, 30% Pro Developer, and 10% Enterprise Managed so free usage does not crowd out paid revenue.

4Price Points$29 / $99 / $499

Confirm these monthly prices still close, and only count the $3,000 enterprise setup fee when the sales motion can support repeat deals.

5Fixed Load$47.7K/mo

Keep Year 1 fixed spend near this level, because about 80% contribution margin still requires roughly $59.6K in monthly revenue to break even.

6Cash Buffer$165K / M29

Fund the $90K launch capex and hold at least $165K cash through Month 29, then delay support and infrastructure hires if usage costs outrun paid revenue.