What could be claimed if a Korean wage-peak scheme is invalid?
After hearing about a colleague’s wage-peak lawsuit, an employee or a recently retired worker may want to know which reductions could still be claimed and how quickly to prepare the records.
This calculator organizes past wage reductions and a retirement-benefit difference on the condition that the scheme is found invalid.
It connects each monthly reduction to a payment date rather than projecting future annual earnings.
Family members helping a parent collect payslips can use the same worksheet.
Korea-based 2026 rules · verified 2026-11-08
All amounts are before-tax KRW, and the result does not determine invalidity, a probability of winning or actual cash collection.
Monthly wages and retirement benefits have different limitation starting points and are reviewed separately.
Dates shown are nominal reference endpoints before holiday extensions and case-specific interruption events.
A reference-expired classification is not a legal finding that the claim has been extinguished.
Four categories of evidence for an invalidity review
Supreme Court decision 2017Da292343, dated 2022-05-26, considered several circumstances when reviewing a scheme that reduced pay while keeping the retirement age unchanged.
A worker’s age or a particular reduction percentage does not by itself establish invalidity.
These categories help locate evidence; they are not a scoring system for predicting a court result.
Justification for introducing the scheme
Collect the stated purpose, workforce and business circumstances, introduction notices, labor-management agreements and explanatory materials.
A statement in a company notice is not by itself proof that the purpose justifies the treatment.
Extent of the employee’s disadvantage
Compare payment ratios, the reduction period and the treatment of bonuses and allowances.
Keep actual individual losses and any change to retirement age in the same evidence file.
Measures compensating for the reduction
Check changes in workload, work intensity, working hours and other compensating measures.
Compare the written policy with what the employee actually did.
Use of the money saved
Look for evidence of whether the savings were used for the purpose of introducing the scheme.
A scheme accompanied by a retirement-age extension presents different facts and should not automatically receive the same conclusion.
Enter affected basic pay, allowances, bonuses and payment ratios
Use monthly basic pay immediately before the wage-peak reduction and only the fixed allowances affected by that reduction.
Adding unaffected meal payments or welfare benefits can overstate the reference principal.
The model keeps the pre-peak wage basis unchanged throughout the entered period; later wage increases and newly introduced allowances need a separate reconciliation.
Up to six 12-month scheme years
A payment ratio of 90% means that 90% of the original wage was paid and 10% was reduced.
The first scheme year runs for 12 months from the starting month, and each subsequent 12-month period uses the next ratio.
A calendar-year change does not itself advance the scheme year.
Periods longer than six years need a separate review.
One annual bonus payment month
The annual bonus input assumes one affected annual bonus paid in the selected month.
The monthly claim ledger adds its reduction to the row whose actual payment month matches that selection, rather than adding one twelfth to every month.
The bonus and that row’s monthly wage are assumed to share a contractual payment day; with next-month payment, the wage month and bonus payment month can differ.
Quarterly bonuses, multiple payment dates or a bonus with a different reduction ratio need a payslip-based calculation outside this simplified schedule.
Separate the wage month from the actual payment due date
Wages for October may be payable on November 10; the due date drives the limitation and delay reference, not merely the month in which the work was done.
Select same-month or next-month payment and the contractual payment day from 1 through 31.
If the day does not exist in the payment month, the calculator uses that month’s last day.
Where weekends, holidays or a special company rule change the contractual date, reconcile the actual due date with the employment records.
Monthly reduction formula
Monthly reduction = (basic pay + affected fixed allowances + annual bonus for its selected payment month) × (1 − scheme-year payment ratio ÷ 100)
Each monthly amount is rounded to whole KRW.
Items due after the filing reference date are shown as not yet due and excluded from the current claim principal and interest.
The starting and ending months are treated as complete months.
Mid-month implementation, partial service, unpaid leave and variable performance pay require separate actual-pay reconciliation.
Early-settlement reference for final wages not yet due at retirement
To reflect the 14-day settlement requirement in Labor Standards Act Article 36, final wages whose contractual date has not arrived at retirement use the earlier of that contractual date and the effective retirement date plus 13 days as their payment deadline.
An agreed extension is not modeled.
The limitation reference does not add 14 days: it uses the earlier of the contractual payday plus three calendar years and the nominal three-year endpoint beginning at midnight on the effective retirement date.
For a final workday of 2026-01-31, effective retirement on 2026-02-01 and January wages contractually due on the 25th of the following month, the settlement payment deadline is 2026-02-14, the earliest conditional 20% reference is 2026-02-15 and the conservative limitation reference is 2029-01-31.
This is a conservative review assumption combining the verified provisions, not a rule establishing the final-wage limitation starting point through a directly applicable judgment.
Have a professional confirm the actual starting point, holidays, agreements and excluded interest periods.
Read each three-year nominal limitation endpoint carefully
Article 49 of the Labor Standards Act provides a three-year limitation period for wage claims.
For ordinary monthly wages, this worksheet adds three calendar years to the contractual due date and shows the nominal endpoint before holiday adjustments; final wages not yet due at retirement instead use the conservative early-settlement reference explained above.
The endpoint itself remains within the reference range; a comparison date on the following day places the amount in the reference-expired group.
Where a corresponding calendar date does not exist, the relevant month-end is used.
Date-boundary examples
A payment due on 2023-11-08 has a nominal endpoint of 2026-11-08.
It remains included on that reference date and moves to the reference-expired category on the next day.
Adding three calendar years to a 2024-02-29 payment gives a nominal date of 2027-02-28.
These are examples before holiday adjustment, not confirmed final filing deadlines.
Reference-expired does not establish extinction
Civil Act Article 161 can extend a last day falling on a Saturday or public holiday.
Acknowledgment of a debt, a court claim, attachment, provisional attachment and other case facts can also change the analysis.
A disputed payment date or a claim already included in proceedings needs separate review.
Do not abandon an item solely because this worksheet groups it as reference-expired.
A demand requires receipt evidence and a timely follow-up
Civil Act Article 174 makes the effect of a demand conditional on a court claim or another specified measure within six months.
Enter the date the other party received the demand, rather than the date a certified-content letter was posted.
The worksheet uses that receipt date as a conditional comparison date only when the actual or planned filing date is no earlier than receipt and no later than six calendar months afterward.
Limits of the demand scenario
- A demand does not revive an item already outside its nominal period before receipt.
Other interruption events require a separate legal review.
- Receipt on 2026-05-08 and filing on 2026-11-08 meet this nominal six-month test; filing on the following day does not.
This six-month reference also excludes holiday extensions.
- Repeated demands are not assumed to keep extending the period indefinitely.
Verify the court’s actual receipt date, the scope of the claim and the evidence showing delivery to the employer.
Use the next-month reference amount to prioritize review
The next-one-month reference amount totals currently included wage reductions with nominal endpoints after the filing reference date and through one calendar month later.
It is a rolling one-month interval, not the first through last day of the next named calendar month.
The amount identifies principal to review promptly if no preserving action is taken; it does not predict a legally certain loss next month.
When a qualifying demand scenario already conditionally preserves an item, first check the follow-up filing condition and planned date.
Three checks in the monthly ledger
- Match each payment date to payroll records and confirm that future-due items are outside the current claim principal.
- Collect payslips and demand-receipt evidence first for rows with approaching nominal endpoints.
- Retain reference-expired rows for review alongside prior proceedings, debt acknowledgments, provisional attachments and holiday information.
Restore actual three-month average wage for retirement benefits
Enter the effective retirement date: the day after the final working day.
Service days are the difference between the hire date and that effective date.
First confirm at least one year of continuous service and the statutory working-time requirement, including the relevant average of 15 hours per week.
Article 8 of the Employee Retirement Benefit Security Act uses 30 days of average wage per service year; Article 15 supplies the statutory minimum comparison for a defined-benefit, or DB, plan.
A more favorable company plan may provide additional benefits outside this minimum comparison.
Restored wage and difference formulas
Restored daily average wage = max((actual three-month wages + restoration addition) ÷ actual calculation days, daily ordinary wage)
Restored retirement benefit = restored daily average wage × 30 × service days ÷ 365
Retirement-benefit difference = max(restored benefit − retirement benefit already paid, 0)
Check the ordinary-wage floor under Labor Standards Act Article 2(2).
Three calendar months do not always contain 90 days, and excluded average-wage periods can affect both the wage numerator and the day denominator.
Include the appropriate allocated bonus amount in the restoration addition; an annual bonus is not included in full merely because it was paid during the final three months.
Retirement limitation dates and the exclusion of DC calculations
Do not add a 14-day payment grace period to limitation
The three-year retirement-benefit period in Article 10 is reviewed separately from monthly wages.
Using an effective retirement date beginning at midnight, the nominal endpoint is the day before the date three calendar years later.
Where that corresponding date does not exist, as with February 29 three years later, use the month-end of February 28 without subtracting another day.
The 14-day payment period and the start of delay interest are separate issues; the worksheet does not add 14 days to this limitation endpoint.
Verify the meaning of the retirement date, any settlement and the actual holiday-adjusted endpoint.
DC contributions and investment outcomes need another model
A defined-contribution, or DC, plan links employer contributions to annual wages and subsequent account investment.
Do not deduct a DC account balance from an average-wage-based retirement benefit as if both were the same calculation.
This tool compares statutory retirement benefits and the DB minimum only.
DC contribution shortfalls, payment timing and lost investment returns need a separate record-based assessment.
5%, 6%, 12% and 20% belong to different conditional scenarios
The default is no interest.
Civil Act Article 379’s 5% or Commercial Act Article 54’s 6% can be selected as conditional base-rate scenarios.
A 6% commercial rate is not automatically applicable to every employer and wage claim; confirm the nature of the employer and obligation.
The calculation uses simple interest: principal × annual rate × actual days ÷ 365, excluding the due date and including the reference date.
Whole-KRW rounding for individual principal items can cause small differences from a single aggregate calculation.
The litigation 12% segment
Check service of the complaint or equivalent document and the restriction for periods when disputing the existence or scope of the debt is reasonable.
The model uses a 12% start date confirmed by the user and separates it from the preceding base-interest segment.
Do not enter the filing date as an automatic 12% starting date.
The separate Labor Standards Act 20% comparison
Read Article 37 with Decree Articles 17 and 18.
Exclusions can apply, including a period when litigating whether wages exist is appropriate.
The 20% comparison requires confirmation of the exclusions and an applicable start date.
It is not added on top of base interest or the 12% segment.
Current-worker transition and retired-worker payment timing
The current-worker amendment took effect on 2025-10-23 and applies where the event giving rise to delay interest occurs on or after implementation.
A regular payment due on 2025-10-22 starts becoming late on the following day; distinguish this boundary from an earlier payment that cannot simply receive retroactive current-worker 20% treatment.
For a retired worker, check the 14-day payment period and the actual excluded periods separately.
Under Article 37(2), wages already accruing the amended interest during employment retain that starting point after retirement; retirement does not reset their start to the end of another 14-day period.
The model accepts a user-confirmed applicable start date, so obtain case-specific review of employment and retirement history before treating a 20% result as a claim entitlement.
Worked examples for reduced pay and the retirement difference
90% payment of a 4,500,000 KRW monthly basis
Assume 4,000,000 KRW basic pay, 500,000 KRW affected fixed allowances, no annual bonus and a 90% payment ratio.
The monthly reduction is 450,000 KRW.
Twelve months total 5,400,000 KRW if all payments are due and remain inside the nominal reference range.
A 100% ratio gives no reduction; a 0% ratio gives a 4,500,000 KRW monthly reduction.
Bonus months and reference-expired rows change the included total.
Restoring three-month wages to 12,000,000 KRW
Assume actual three-month wages of 9,000,000 KRW, a 3,000,000 KRW restoration addition, 90 calculation days and daily ordinary wage of 100,000 KRW.
At 3,650 service days, the restored benefit is 40,000,000 KRW.
After 30,000,000 KRW already paid, the difference is 10,000,000 KRW.
The 3,650 days are an explicit example assumption; actual hire and retirement dates may include leap days.
The limitation treatment and interest on that difference still require separate checks.
The after-cost balance subtracts the user’s estimate of court stamp, service, counsel and other personal litigation costs from the reference principal and selected interest.
It can be negative where costs exceed the estimate.
It is not actual collected cash or a determination of recoverable costs against the other party.
Court prospects, employer assets, tax, deductions and enforcement expenses require separate review.
Steps and documents for a consultation
- Reconcile payslips before and after the wage-peak scheme, the scheme-year ratios and the affected basic pay, allowances and bonus.
- Enter the first and final wage months, contractual payment day and same-month or next-month setting, then inspect the monthly ledger.
- If using a demand, enter receipt and the filing reference date and verify the six-month follow-up condition.
A planned date remains conditional on filing as planned.
- For retirement, enter hire and effective retirement dates, average-wage evidence and the benefit already paid separately.
- Confirm the legal basis and start of each interest scenario, add personal cost estimates and save the ledger for professional review.
Evidence checklist
- Work rules, collective agreements, labor-management agreements and scheme-introduction notices before and after implementation
- Monthly payslips, bank receipts, bonus payment rules and the employment contract
- Records of workload and working-hour changes and use of the money saved
- Hire, retirement and intermediate-settlement records; actual three-month pay, days and ordinary-wage evidence
- Demand-receipt evidence, prior complaints, filing receipts, service records, acknowledgments and provisional attachment documents
Frequently asked questions
Does a result mean the wage-peak scheme is invalid?
No.
Amounts assume invalidity is established.
A professional must review the purpose, disadvantage, compensating measures, use of savings, retirement-age changes and applicable decisions.
Does the result cover the entire wage-peak period?
The ledger separates each payment against a nominal three-year period.
Reference-expired and future-due amounts are outside the current reference principal.
Actual holiday extensions and interruption events need further review.
Does sending a demand automatically add six months?
Receipt and a qualifying follow-up under Civil Act Article 174 must be confirmed.
Posting alone or repeated letters do not establish indefinite preservation.
This model compares a receipt date with a filing date within the following six nominal calendar months.
Can I add 14 days when retirement limitation is close?
The payment grace period and limitation are separate.
The retirement date here is the day after the last working day, and 14 days are not added to its nominal endpoint.
Promptly verify the actual starting point and preservation measures when a boundary is close.
Can every reduction receive 20% interest?
No.
Check the current-worker transition, retired-worker payment period and Decree Article 18 exclusions, including appropriate litigation over whether wages exist.
The confirmed-start 20% scenario is separate and is never stacked on other interest.
Is a bonus paid in the final three months included in full?
The claim ledger’s bonus payment month and the average-wage allocation are different issues.
Confirm the appropriate bonus allocation and excluded periods for average wage rather than adding the whole annual bonus merely because it was paid then.
Can a DC account balance be entered as retirement benefit already paid?
This tool restores average wage for statutory benefits and the DB minimum.
DC contribution timing and investment outcomes use a different structure.
Do not deduct a DC account balance in this formula; review contribution shortfalls separately.
What if part of a reduction was repaid or settled?
This simplified ledger does not automatically allocate partial payments, settle interest or determine an agreement’s effect.
Record every amount and payment date separately to avoid duplicate claims and obtain a review of the actual balance.
Official sources and future rechecks
The current statutes and Supreme Court decision were checked through the National Law Information OPEN API on 2026-11-08.
The relevant Labor Standards Act version took effect on 2026-10-08, its Decree on 2025-10-23, the Civil Act on 2026-03-17 and the relevant retirement-benefit provisions on 2026-07-01.
The special litigation statute version took effect on 2026-06-02; the 12% rate regulation took effect on 2019-06-01.
Recheck later legislation and wage-peak decisions, actual payment dates, limitation interruption, bonus allocation, excluded average-wage periods and the company’s DB rules.
- Labor Standards Act Articles 2, 36, 37, 43 and 49 · MST285279; average wage, payment, interest and the three-year period
- Labor Standards Act Decree Articles 17 and 18 · MST270551; 20% and exclusions
- Employee Retirement Benefit Security Act Articles 8, 10, 15 and 20 · MST284455; statutory, DB and DC distinctions
- Civil Act Articles 157, 159–161, 166, 174 and 379 · MST284415; periods, demands and 5%
- Commercial Act Article 54 · MST273629; commercial 6%
- Special Act on Expedition of Legal Proceedings Article 3 · MST286417 and rate regulation MST208701; 12% and reasonable-dispute restrictions
- Supreme Court 2017Da292343 · precedent ID221949, decided 2022-05-26
- Ministry of Employment and Labor transition guidance · answer dated 2026-10-02; regular payment due on 2025-10-22