Trade Call-out Fee Planner methodology

labourAndTravelCostExTax = (travel + diagnostic hours) * loaded labour rate + distance cost + mobilisation

capacityDisplacementCostExTax = displaced billable hours * displaced contribution per hour

protectedCalloutCostExTax = labour/travel cost + capacity displacement cost

requiredCalloutFeeExTax = protected call-out cost / (1 - target margin)

expectedFollowOnContributionExTax = conversion rate * follow-on job contribution

expectedEconomicContributionExTax = proposed fee - protected cost + expected follow-on contribution

proposedFeeGapExTax = proposed fee - required call-out 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.

• All inputs must be finite and inside the visible validation boundaries.
• Rates are retained as decimal values and shown as percentages only at the presentation boundary.
• The worked fixture must expose every declared result: labourAndTravelCostExTax, capacityDisplacementCostExTax, protectedCalloutCostExTax, requiredCalloutFeeExTax, expectedFollowOnContributionExTax, expectedEconomicContributionExTax, proposedFeeGapExTax.
• Scenario comparison changes one declared driver while holding the remaining industry records constant.

Mobilisation and dispatch cost minimum

mobilisationCostExTax ≥ 0 currency units/call-out, ex tax — A lower value is rejected before calculation.

Mobilisation and dispatch cost maximum

mobilisationCostExTax ≤ 10,000,000 currency units/call-out, ex tax — A higher value is rejected before calculation.

Round-trip travel hours minimum

travelHours ≥ 0 hours/call-out — A lower value is rejected before calculation.

Round-trip travel hours maximum

travelHours ≤ 168 hours/call-out — A higher value is rejected before calculation.

Included diagnostic hours minimum

diagnosticHours ≥ 0 hours/call-out — A lower value is rejected before calculation.

Included diagnostic hours maximum

diagnosticHours ≤ 168 hours/call-out — A higher value is rejected before calculation.

Loaded trade labour cost per hour minimum

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

Loaded trade labour cost per hour maximum

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

Round-trip distance minimum

roundTripDistanceKm ≥ 0 kilometres/call-out — A lower value is rejected before calculation.

Round-trip distance maximum

roundTripDistanceKm ≤ 100,000 kilometres/call-out — A higher value is rejected before calculation.

Vehicle cost per kilometre minimum

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

Vehicle cost per kilometre maximum

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

Displaced billable hours minimum

displacedBillableHours ≥ 0 hours/call-out — A lower value is rejected before calculation.

Displaced billable hours maximum

displacedBillableHours ≤ 168 hours/call-out — A higher value is rejected before calculation.

Displaced contribution per hour minimum

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

Displaced contribution per hour maximum

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

Expected follow-on job conversion minimum

expectedJobConversionRate ≥ 0 decimal fraction of call-outs converting to follow-on work — A lower value is rejected before calculation.

Expected follow-on job conversion maximum

expectedJobConversionRate ≤ 1 decimal fraction of call-outs converting to follow-on work — A higher value is rejected before calculation.

Follow-on job contribution minimum

expectedFollowOnJobContributionExTax ≥ 0 currency units/converted follow-on job, ex tax — A lower value is rejected before calculation.

Follow-on job contribution maximum

expectedFollowOnJobContributionExTax ≤ 10,000,000 currency units/converted follow-on job, ex tax — A higher value is rejected before calculation.

Target call-out margin minimum

targetCalloutMargin ≥ 0 decimal fraction of call-out fee — A lower value is rejected before calculation.

Target call-out margin maximum

targetCalloutMargin ≤ 0.99 decimal fraction of call-out fee — A higher value is rejected before calculation.

Proposed call-out fee minimum

proposedCalloutFeeExTax ≥ 0 currency units/call-out, ex tax — A lower value is rejected before calculation.

Proposed call-out fee maximum

proposedCalloutFeeExTax ≤ 10,000,000 currency units/call-out, ex tax — A higher value is rejected before calculation.

• Costs, capacity, contract terms, tax rates and targets are supplied by the user.
• No provider default, jurisdictional rule or industry benchmark is embedded.
• The shared engine retains full precision and display formatting never feeds 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 are only as reliable as the timing, scope and basis of the entered records.
• The workflow does not predict demand or establish accounting, tax, contractual or legal treatment.

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.