Startup Guide

Business Plan BEP — Answer 'When Do We Break Even?' Not Just Show the Formula

2026.10.21·6 min·OPENSEED

MENTORING KNOWLEDGE FORCFORisk Analyst

The break-even point (BEP) is where total revenue equals total costs — no profit, no loss. If your business plan's financial section closes out BEP with a single formula, it won't hold up to the questions reviewers actually ask. In practice, BEP draws two questions: 'Are the fixed and variable cost assumptions realistic?' and 'When, and under what conditions, can the business turn profitable?'

Intro.

#The BEP Formula and Its Assumptions

The standard BEP formula is: Fixed Costs ÷ (1 − Variable Costs / Revenue). If monthly fixed costs are $9,000 and the variable cost ratio is 40%, the BEP is $15,000. This formula applies across industries.

Category	Definition	Example Items
Fixed Costs	Costs that remain constant regardless of revenue	Rent, salaries, depreciation
Variable Costs	Costs that increase as revenue grows	Materials, payment processing fees, shipping
BEP (revenue basis)	Fixed Costs ÷ (1 − Variable Cost Ratio)	$9,000 ÷ 0.6 = $15,000

Presenting a result and demonstrating how realistic the underlying assumptions are two different things. Reviewers will actually check what line items sum to the $9,000 in fixed costs, and what cost structure produces the 40% variable cost ratio. Because BEP assumes constant pricing, linear costs, and a clean separation of fixed and variable costs, you need to show why those assumptions hold.

#The Specificity of Your Cost Assumptions Determines Credibility

Lumping costs together as 'operating expenses: $X' gives reviewers nothing to verify. Break fixed and variable costs into individual line items and show how each was calculated. That's also the foundation for numerical consistency across the entire financial plan.

Fixed costs by line item: rent (rate per sq ft by location), salaries (headcount by role × monthly pay), depreciation (equipment cost ÷ useful life)
Variable costs by line item: materials (as % of revenue or unit cost), payment processing fees (per contract rate), shipping (cost per order × estimated order volume)
Insurance, legal fees, and maintenance costs are easy to underestimate — when in doubt, classify uncertain costs as variable and estimate conservatively
If adding headcount means fixed costs step up when output crosses a threshold (step costs), state that threshold and the size of the increase

TIP

The 2026 Early-Stage Startup Package grant (for ventures under 3 years old) requires business plans to include unit costs and detailed derivations for every budget line — salaries, marketing, development, and other expenses. Commentary on the program notes that numerical inconsistencies are scored as deductions. ※ Always verify against the official K-Startup announcement.

#Why Three Scenarios Instead of a Single Number

Because BEP estimates rest on specific assumptions, any unexpected variable changes the result. Presenting only a single BEP figure gives reviewers no way to confirm whether the founder understands how even a small shift in assumptions affects the profitability timeline. Expressing BEP as a range across optimistic, base, and conservative scenarios changes two things: it shows the span of possible break-even timelines under different conditions, and it signals that the founder has identified the key variables.

Scenario	Key Assumption Change	BEP Direction	How to Present
Optimistic	Customer acquisition on plan, churn within target	Equal to or below base BEP	Revenue-based BEP + projected month of achievement
Base	80% of plan achieved, costs on budget	Reference BEP	Revenue-based BEP + projected month of achievement
Conservative	Material costs up 15%, largest customer churns, 2 additional hires	BEP increases	Revenue-based BEP + projected month of achievement

Key variables across scenarios include rising material costs, loss of a major customer, and additional hires. The structure that builds credibility is to define how each variable shifts per scenario and then recalculate BEP separately for each. The goal is not the number itself but showing what assumptions produced it.

주의

If your business uses discounting: a 17% price cut increases the sales volume needed to hit BEP by roughly 37.5%, because the discount comes directly out of the contribution margin. If your sales scenarios include promotional pricing, that must be reflected in your BEP analysis.

Summary.

#Numerical Consistency Across the Financial Plan

If the unit price and customer count used in your revenue projections don't match the variable cost ratio in your BEP calculation, financial consistency breaks down. That inconsistency is a bigger credibility problem than the numerical error itself. BEP is not a standalone calculation — it must share a single number system with your revenue estimates and budget plan.

Fixed costs summarized as 'including salaries, $X/month' in one line — no itemized derivation
Variable cost ratio stated as 'industry average' with no source or formula
Only a single BEP figure presented, with no sensitivity to changing assumptions
Sales scenarios include discounts or promotions, but BEP uses only full-price assumptions
Unit price and customer count in the revenue section don't match the numbers used in BEP

OpenSeed is a feedback tool that reviews your financial plan section to find weaknesses in evidence, numbers, and logic, and to prioritize what to fix. It checks the specificity of your fixed and variable cost assumptions, numerical consistency between revenue estimates and BEP, and whether scenario analysis is present. Addressing these three things before you submit will cut down most of the revision requests that come back on the financial section.