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Business & Tax
How long a startup takes to break even is set by three numbers: fixed cost base, contribution margin, and monthly revenue growth rate.
By FreeCalculators Editorial · Published 2026-09-01 · Updated 2026-09-04 · 4 min read · 923 words
A startup breaks even in the month its revenue first covers fixed costs plus variable costs — and the date is determined by only three inputs: the fixed cost base, contribution margin, and the compounding rate of monthly revenue growth. Everything else is commentary. Model those three and you get both a target month and the amount of cash you must hold to reach it.
Break-even revenue is fixed costs divided by contribution margin. Revenue growing at a constant monthly rate reaches that level after a predictable number of months, and the relationship is logarithmic: doubling the growth rate roughly halves the wait, while a small growth shortfall stretches the timeline dramatically.
| Monthly revenue growth | Months to reach $46,154 | Revenue in month 12 |
|---|---|---|
| 5% | 36 | $14,367 |
| 8% | 23 | $20,146 |
| 12% | 16 | $31,168 |
| 15% | 13 | $42,803 |
| 20% | 10 | $71,329 |
The gap between 8% and 15% monthly growth is ten months of burn — often the difference between one funding round and two. That is why growth rate, not cost cutting, dominates the timeline in the early months.
The timeline is only half the answer. Every month below break-even burns the shortfall between contribution earned and fixed costs paid, and the sum of those shortfalls is the capital requirement. Model it month by month rather than multiplying an average, because the early months burn hardest.
Cumulative burn to break-even (2026)
Fixed costs: $30,000 per month; contribution margin 65% Break-even revenue: $30,000 / 0.65 = $46,154 Month 1 revenue $8,000: contribution $5,200, burn $24,800 Month 6 revenue $14,100: contribution $9,165, burn $20,835 Month 12 revenue $31,168: contribution $20,259, burn $9,741 Month 16 revenue $49,050: contribution $31,883, profit $1,883 Cumulative burn months 1-15: about $258,000 Capital to raise with 25% buffer: about $323,000
Compare that $258,000 with the $30,000 monthly fixed cost that felt affordable in the plan. The burn total, not the monthly figure, is what a founder must actually fund. Model the same path in the runway calculator to see how many months the cash on hand covers.
The Bureau of Labor Statistics (BLS) Business Employment Dynamics data shows about one in five new establishments closes in its first year and roughly half are gone by year five, which brackets the realistic planning window. The Federal Reserve publishes an annual Small Business Credit Survey documenting how small firms cover shortfalls, and reliance on owner personal funds and personal credit is a persistent theme. Both point the same way: a timeline longer than the cash on hand is the failure mode, not slow growth itself.
Set a decision date, not just a target date. If revenue is more than 25% below the modelled path at the halfway mark, the plan needs a structural change rather than another month of patience.
Comprehensive Guide
Read our business and tax guide for margins, payroll, and tax planning.
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How this guide was created
This guide was written and reviewed by FreeCalculators Editorial, drawing on published formulas, official government sources, and real calculator outputs from our 4 calculators in this category. Every claim is sourced; every formula is auditable. Read our review policy.