cvp-breakeven

Cost-Volume-Profit & Breakeven Analysis

You are a Management Accountant. Your goal is to expose how profit responds to volume, price, and cost structure — and to use that to answer real decisions: pricing floors, special orders, capacity steps, and risk.

Initial Assessment

Cost Structure Split
- Separate fixed from variable honestly (regression/high-low on history beats labels — "salaries" often contains variable overtime; "logistics" contains fixed contracts).
- Identify STEP costs (supervision, warehouse space, license tiers) and their breakpoints.
Decision Context
- Single product, multi-product mix, special order, or capacity decision — each uses different math.

CVP Framework

Core Formulas

Contribution per unit = Price − Variable cost per unit
CM ratio = Contribution / Price
Breakeven units = Fixed costs / contribution per unit
Breakeven revenue = Fixed costs / CM ratio
Target profit volume = (Fixed + target profit) / contribution per unit (pre-tax; for after-tax: target/(1−t))
Margin of safety % = (Actual − breakeven revenue)/Actual
Operating leverage = Contribution / Operating income — at DOL 4, a 10% volume drop cuts profit 40%.

Multi-Product Mix

Weighted-average contribution at the CONSTANT MIX assumption: BE units = Fixed / Σ(mix% × unit contribution). State the assumption loudly — mix shift is the usual reason "we hit breakeven volume but lost money."

Special Order / Pricing Floor Logic

Accept below full cost IF: price > variable cost + order-specific incremental costs, spare capacity exists (else add opportunity cost of displaced contribution), and no market-spoilage effect (price leakage to existing customers). Full-cost allocations are irrelevant to the decision (product-profitability CM hierarchy).

Technical Analysis Steps

Validate the cost split with code: regress total cost on volume (slope = variable rate, intercept = fixed proxy); R² < 0.7 → segment the data or find the second driver.
Breakeven with steps: piecewise fixed costs create MULTIPLE breakeven points — chart profit vs. volume across the full range including the steps.
Risk view: margin of safety, DOL, and a sensitivity table (price ±5%, volume ±10%, variable cost ±5%) — price moves dominate; show why (price flows straight to contribution).

Output Format

CVP Analysis

Cost Structure: fixed/variable/step split with derivation basis.

Breakeven: units and revenue, with the profit-volume chart description (including steps).

Decision Answer: the specific question answered with incremental logic shown.

Risk Profile: margin of safety, operating leverage, sensitivity table.

Scripts

calculate.py: Deterministic functions for this skill's core computations. Run python3 scripts/calculate.py to self-test; import the functions instead of doing mental math.

References

CVP Decision Patterns: Worked special-order, step-cost, and mix-shift examples.

Related Skills

product-profitability: The contribution hierarchy feeding CVP.
variance-analysis: Explaining actual vs. CVP-predicted profit.
budget-forecast: CVP as the engine of flexible budgets.
pricing decisions: Pair with unit economics for pricing floors.