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Market-neutral work and pay guide

How to use the Notice Period Cost calculator

Estimate notice-period opportunity cost without deciding enforceability, required notice or tax.

Keep four transition layers separate

Components of the entered notice scenario
LayerFormula or inputBoundary
Weekly gain delayedmax(0, new net − current net)Only positive entered gain
Delay opportunity costWeekly gain × delayed weeksNot a legal remedy
Unpaid-period costCurrent weekly net × unpaid weeksSeparate from delay
Other transition costsUser-entered cash amountNo inferred legal cost
Employer contributionEntered offsetSubtract only confirmed support

Worked example: eight delayed weeks

calculator fixture in generic currency units
StepCalculationResult
Weekly gain delayed1,500 − 1,000500/week
Delay opportunity cost500 × 84,000
Unpaid and other costs0 + 00
Employer contributionEntered amount0
Total notice-period cost4,000 + 0 − 04,000

A lower new rate does not create a negative delay cost

When entered new weekly net pay does not exceed current weekly net pay, the delay opportunity-cost layer is zero. Unpaid weeks and transition costs can still produce a positive total.

Verify the real transition before relying on the estimate

  • Use current and new weekly amounts on the same net basis.
  • Confirm delayed and unpaid weeks from the actual timeline.
  • Enter employer contributions only when supported by the terms.
  • Check notice, buyout, garden leave, final pay and tax locally.

How the Notice Period Cost calculation works

Total notice-period cost

totalNoticePeriodCost = delayOpportunityCost + unpaidPeriodCost + transitionCosts − employerContribution

totalNoticePeriodCost
Total notice-period cost
delayedWeeks
Delayed weeks
currentWeeklyNet
Current weekly net pay
newWeeklyNet
New weekly net pay
unpaidWeeks
Unpaid weeks
transitionCosts
Transition costs
employerContribution
Employer contribution

The calculator and article use this relationship consistently; the article does not reimplement the calculation.

Delay opportunity cost

delayOpportunityCost = max(0, newWeeklyNet − currentWeeklyNet) × delayedWeeks

delayOpportunityCost
Delay opportunity cost
delayedWeeks
Delayed weeks
currentWeeklyNet
Current weekly net pay
newWeeklyNet
New weekly net pay
unpaidWeeks
Unpaid weeks
transitionCosts
Transition costs
employerContribution
Employer contribution

The calculator and article use this relationship consistently; the article does not reimplement the calculation.

Unpaid-period cost

unpaidPeriodCost = currentWeeklyNet × unpaidWeeks

unpaidPeriodCost
Unpaid-period cost
delayedWeeks
Delayed weeks
currentWeeklyNet
Current weekly net pay
newWeeklyNet
New weekly net pay
unpaidWeeks
Unpaid weeks
transitionCosts
Transition costs
employerContribution
Employer contribution

The calculator and article use this relationship consistently; the article does not reimplement the calculation.

Eight delayed weeks at 1,000 current and 1,500 new weekly net pay.

Inputs used in the Notice Period Cost worked example

Normalized calculator inputs
InputEntered valueWhat it representsSource class
Delayed weeks8 weeksWeeks before the new pay begins.user assumption
Current weekly net pay1,000 currency units/weekCurrent weekly net pay entered by you.user assumption
New weekly net pay1,500 currency units/weekNew weekly net pay entered by you.user assumption
Unpaid weeks0 weeksAny unpaid transition weeks.user assumption
Transition costs0 currency unitsOther one-time transition costs.user assumption
Employer contribution0 currency unitsEmployer support that offsets transition cost.user assumption
Replace these example values with records or assumptions from the decision you are evaluating.

Worked example: Notice Period Cost

The calculator normalizes the inputs above, applies Total notice-period cost, and returns the outputs below. The displayed result is therefore reproducible in the linked calculator.

Calculator-derived default-scenario outputs
MeasureResultInterpretation
Total notice-period cost4,000 currency unitsDelay opportunity cost plus unpaid-period cost and transition costs, less employer contribution.
Delay opportunity cost4,000 currency unitsPositive weekly net gain delayed multiplied by delayed weeks.
Unpaid-period cost0 currency unitsCurrent weekly net pay multiplied by unpaid weeks.

Interpret the result and test Delayed weeks

  • Total notice-period cost: 4,000 currency units. Delay opportunity cost plus unpaid-period cost and transition costs, less employer contribution.
  • Delay opportunity cost: 4,000 currency units. Positive weekly net gain delayed multiplied by delayed weeks.
  • Unpaid-period cost: 0 currency units. Current weekly net pay multiplied by unpaid weeks.
One-input sensitivity: Delayed weeks
ResultBaselineChanged-input scenarioHow to read it
Total notice-period cost4,000 currency units4,500 currency unitsDelay opportunity cost plus unpaid-period cost and transition costs, less employer contribution.
Delay opportunity cost4,000 currency units4,500 currency unitsPositive weekly net gain delayed multiplied by delayed weeks.
Unpaid-period cost0 currency units0 currency unitsCurrent weekly net pay multiplied by unpaid weeks.
Only Delayed weeks changes: 8 weeks to 9 weeks. All other normalized inputs stay fixed.

Checks that are specific to Notice Period Cost

  • The worked example is calculated through the same shared-work-logic engine as the planner.
  • Non-finite and out-of-range assumptions return an input error.
  • Result cards, trace, CSV, PDF and methodology bind to named engine result fields.

What this Notice Period Cost guide includes and excludes

  • Weekly net amounts are supplied by the user.
  • Employer contributions directly offset entered costs.

Sources and method boundary

Change history

  1. July 28, 2026Published How to use the Notice Period Cost calculator.