Service Level Cost Planner methodology

incrementalServiceCost = orders × (proposed service cost per order − baseline service cost per order)

expectedRetainedCustomers = orders × expected retention uplift

retentionContribution = expected retained customers × contribution per retained customer

netServiceLevelBenefit = retention contribution − incremental service cost − implementation cost

breakEvenRetentionUpliftRate = (incremental service cost + implementation cost) / (orders × contribution per retained customer)

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.

• All inputs must be finite and remain inside the visible non-negative validation boundaries.
• Capacity and demand fields that represent physical units reject fractional values where the engine requires whole units.
• Rates remain inside the closed range from 0% to 100%.
• Unreachable contribution, crossover or payback thresholds return an explicit unavailable state rather than Infinity.
• Option comparisons reject an infeasible option when its entered capacity is below the required workload.
• The raw break-even retention uplift remains visible even above 100%, while the separate reachability state marks any threshold above the supported 0%–100% input domain as operationally unreachable.

Orders in decision period minimum

orders ≥ 0 orders/period — A lower value is rejected before calculation.

Orders in decision period maximum

orders ≤ 100,000,000 orders/period — A higher value is rejected before calculation.

Baseline service cost per order minimum

baselineServiceCostPerOrder ≥ 0 currency units/order, ex tax — A lower value is rejected before calculation.

Baseline service cost per order maximum

baselineServiceCostPerOrder ≤ 10,000,000 currency units/order, ex tax — A higher value is rejected before calculation.

Proposed service cost per order minimum

premiumServiceCostPerOrder ≥ 0 currency units/order, ex tax — A lower value is rejected before calculation.

Proposed service cost per order maximum

premiumServiceCostPerOrder ≤ 10,000,000 currency units/order, ex tax — A higher value is rejected before calculation.

Expected retention uplift minimum

expectedRetentionUpliftRate ≥ 0 decimal fraction of decision-period orders (1 = 100%) — A lower value is rejected before calculation.

Expected retention uplift maximum

expectedRetentionUpliftRate ≤ 1 decimal fraction of decision-period orders (1 = 100%) — A higher value is rejected before calculation.

Contribution per retained customer minimum

retainedCustomerContribution ≥ 0 currency units/additionally retained customer, ex tax — A lower value is rejected before calculation.

Contribution per retained customer maximum

retainedCustomerContribution ≤ 10,000,000 currency units/additionally retained customer, ex tax — A higher value is rejected before calculation.

Implementation cost minimum

implementationCost ≥ 0 currency units/service-level implementation, ex tax — A lower value is rejected before calculation.

Implementation cost maximum

implementationCost ≤ 10,000,000 currency units/service-level implementation, ex tax — A higher value is rejected before calculation.

• All operating volumes, rates, workload, capacity, time, cost and contribution values are supplied by the user.
• Money inputs use one consistent ex-tax basis and every record refers to the same operating period.
• Demand realisation, recovery, hours saved and expected unit rates are scenarios, not forecasts or benchmarks.
• Committed sunk cost is disclosed but excluded from make, buy, outsource and hire incremental economics.
• The shared engine retains raw precision and display formatting never feeds back into calculation.

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.

• Results depend on complete and comparable incremental cost, capacity and operating records.
• The model does not forecast demand, service quality, employee performance, supplier reliability or disruption duration.
• A positive result or short payback does not establish implementation feasibility or guarantee a commercial outcome.
• The planner does not replace operational, 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.

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.

1. 2026-07-31: Initial public release of the planner and methodology after pre-launch calculation, content, source and interaction review.