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Methodology

Fixed Cost Recovery Planner methodology

Measure the incremental units needed to recover a fixed-cost increase.
Duc Nguyen X.By Duc Nguyen X.· Founder, Margin101Last reviewed: View update historyMethodology

Educational only: Business decision support, not accounting, tax or legal advice.

Privacy: Calculations run locally; Margin101 does not receive your commercial inputs.

Update policy: Reviewed when formulas or official dependencies change.

Scope: Market-neutral small-business planning using your own assumptions.

1. Formulas and units

Recovery Units
recoveryUnits = ceil(fixed-cost increase / contribution per unit)

Where

fixedCostIncreaseExTax
Fixed-cost increase (currency units/planning period, ex tax)Source: Business record
contributionPerUnitExTax
Contribution per unit (currency units/unit, ex tax)Source: Business record
recoveryUnits
Recovery Units (whole units/planning period)Source: Calculated output
Contribution At Planned Units Ex Tax
contributionAtPlannedUnitsExTax = contribution per unit × planned incremental units

Where

contributionPerUnitExTax
Contribution per unit (currency units/unit, ex tax)Source: Business record
plannedIncrementalUnits
Planned incremental units (units/planning period)Source: User decision
contributionAtPlannedUnitsExTax
Contribution At Planned Units Ex Tax (currency units, ex tax)Source: Calculated output
Recovery Surplus Ex Tax
recoverySurplusExTax = planned contribution − fixed-cost increase

Where

fixedCostIncreaseExTax
Fixed-cost increase (currency units/planning period, ex tax)Source: Business record
contributionPerUnitExTax
Contribution per unit (currency units/unit, ex tax)Source: Business record
recoveryUnits
Recovery Units (whole units/planning period)Source: Calculated output
contributionAtPlannedUnitsExTax
Contribution At Planned Units Ex Tax (currency units, ex tax)Source: Calculated output
recoverySurplusExTax
Recovery Surplus Ex Tax (currency units, ex tax)Source: Calculated output
Recovery Rate
recoveryRate = planned contribution / fixed-cost increase

Where

fixedCostIncreaseExTax
Fixed-cost increase (currency units/planning period, ex tax)Source: Business record
contributionPerUnitExTax
Contribution per unit (currency units/unit, ex tax)Source: Business record
recoveryUnits
Recovery Units (whole units/planning period)Source: Calculated output
contributionAtPlannedUnitsExTax
Contribution At Planned Units Ex Tax (currency units, ex tax)Source: Calculated output
recoveryRate
Recovery Rate (decimal rate)Source: Calculated output

Money inputs and outputs use the currency selected in the scenario without changing the canonical methodology. Rates, margins, utilisation and buffers are entered as percentages and converted to decimal values for calculation.

2. Worked example

Input assumptions

The worked rows below come directly from the registered engine and visible default fixture.

Calculation and outputs

Example

The worked rows below come directly from the registered engine and visible default fixture.

Recovery Units
750 units
Contribution At Planned Units Ex Tax
40,000 currency units
Recovery Surplus Ex Tax
10,000 currency units
Recovery Rate
133.3%

The exact engine-derived outputs are shown in the labelled rows below.

Interpretation

Recovery units shows the additional whole-unit volume needed for incremental contribution to cover the fixed-cost increase.

3. Validation and boundary checks

  • All inputs must be finite and within the visible boundaries.
  • Costs, revenue and contribution use one consistent ex-tax basis and planning period.
  • Whole-unit thresholds round upward only where the named engine formula requires it.

4. Assumptions and source classification

  • All prices, costs, demand limits and capacity values are user-supplied records or explicit scenarios.
  • Allocated costs remain visible and separate from avoidable costs.
  • The global workflow infers no market benchmark, policy threshold or future demand.

This planner has no current policy-data dependency. Its commercial assumptions are user supplied. Registered family-level regression suites exercise the shared business-logic engine and worked-result reconciliation.

5. Limitations

  • The model does not forecast demand, implementation timing, service quality or strategic fit.
  • It does not replace accounting, tax, legal or financial advice.

This is educational decision support, not tax, accounting, legal or financial advice. Check the treatment of your actual transactions under the rules that apply to your business and seek qualified advice where appropriate.

6. Update and evidence policy

Registered family-level suites test formula invariants and example reconciliation; the release ledger records that coverage without claiming a separate oracle for every line of public copy. There is no official threshold or benchmark to refresh for this planner. Commercial inputs remain user-supplied because they vary by business and contract.

Change history

  1. : Initial public release of the Fixed Cost Recovery planner and methodology.

Related reading

Guides to interpret the decision and its assumptions.

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