Travel Time Billing Planner methodology

travelContribution = travel revenue − travel cost

travelCost = travel hours × delivery cost + travel expenses

travelRevenue = travel hours × billing rate + recovered expenses

unrecoveredTravelCost = max(0, travel cost − travel revenue)

effectiveRecoveryRate = travel revenue ÷ travel cost

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.

Travel hours minimum

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

Travel hours maximum

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

Delivery cost per hour minimum

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

Delivery cost per hour maximum

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

Travel expenses minimum

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

Travel expenses maximum

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

Travel billing rate minimum

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

Travel billing rate maximum

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

Expense recovery rate minimum

expenseRecoveryRate ≥ 0 proportion of travel expenses recovered from client — A lower value is rejected before calculation.

Expense recovery rate maximum

expenseRecoveryRate ≤ 1 proportion of travel expenses recovered from client — 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.
• Travel time, internal delivery cost, billing rate and expense recovery are user-entered commercial assumptions; no statutory mileage, reimbursement, award, wage or tax rule is applied.
• The result does not establish whether travel time or expenses are contractually chargeable.

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.