Rush Fee Pricing Planner methodology

minimumRushSurcharge = incremental rush cost ÷ (1 − target margin)

overtimeHours = standard hours − rush hours

incrementalRushCost = overtime hours × incremental cost + displaced contribution

minimumRushFee = standard fee + minimum rush surcharge

surchargeRate = minimum rush surcharge ÷ standard fee

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.

• Inputs must be finite and remain within the visible boundaries.
• Rates are decimal values and all monetary inputs use one consistent currency and period.
• Whole operational capacity is rounded only where the engine explicitly applies floor or ceiling.

Standard fee minimum

standardFee ≥ 0 currency units/project — A lower value is rejected before calculation.

Standard fee maximum

standardFee ≤ 10,000,000 currency units/project — A higher value is rejected before calculation.

Standard hours minimum

standardHours ≥ 0 hours/project — A lower value is rejected before calculation.

Standard hours maximum

standardHours ≤ 10,000,000 hours/project — A higher value is rejected before calculation.

Rush hours minimum

rushHours ≥ 0 hours/project — A lower value is rejected before calculation.

Rush hours maximum

rushHours ≤ 10,000,000 hours/project — A higher value is rejected before calculation.

Incremental cost per compressed hour minimum

overtimeCostPerHour ≥ 0 currency units/hour — A lower value is rejected before calculation.

Incremental cost per compressed hour maximum

overtimeCostPerHour ≤ 10,000,000 currency units/hour — A higher value is rejected before calculation.

Displaced contribution minimum

displacedContribution ≥ 0 currency units/project — A lower value is rejected before calculation.

Displaced contribution maximum

displacedContribution ≤ 10,000,000 currency units/project — A higher value is rejected before calculation.

Target margin minimum

targetMargin ≥ 0 proportion of rush fee retained as contribution — A lower value is rejected before calculation.

Target margin maximum

targetMargin ≤ 0.99 proportion of rush fee retained as contribution — A higher value is rejected before calculation.

• All costs, prices, hours, probabilities and volumes are user-supplied; no market benchmark is inferred.
• Tax is outside these neutral commercial comparisons.
• The engine retains full precision; 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.

• The model does not predict demand, delivery performance, contract enforceability or customer behaviour.
• 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.

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.