Your latest monthly salary is a convenient number to remember, but it may be the wrong number for an Employees’ Pension withdrawal estimate. The relevant input is average standard remuneration over the insured period. Preparing that figure carefully can make an estimate more useful than adding extra decimal places to an uncertain salary guess.
Use pension records, not take-home pay
Japan Pension Service’s Employees’ Pension withdrawal calculation FAQ defines the average using recorded standard monthly remuneration and, from April 2003 onward, standard bonuses. For earlier insured periods, the monthly remuneration component is multiplied by 1.3. The combined amount is divided by the total number of insured months.
This means the amount deposited in your bank after payroll deductions is not the calculation input. Nor should you automatically replace the pension record with the gross salary printed in an employment offer. Make a working sheet using the pension record’s monthly amounts and recorded bonuses, preserving the original documents alongside it.
Work through an illustrative example
Suppose all relevant coverage is after March 2003 and the record shows the following hypothetical figures:
- Twelve months at standard monthly remuneration of JPY 280,000.
- Twelve months at standard monthly remuneration of JPY 300,000.
- Standard bonuses totaling JPY 720,000 across those 24 months.
The monthly components total JPY 6,960,000. Adding JPY 720,000 gives JPY 7,680,000, and dividing by 24 gives JPY 320,000 average standard remuneration. This is an arithmetic illustration using assumed recorded amounts, not a prediction of what your employer reported.
Using the latest JPY 300,000 monthly figure alone would omit both the earlier remuneration and the bonuses. Adding an annual bonus to every month would introduce the opposite error. Put each bonus into the worksheet once and check the covered period before totaling it.
Review the whole insured history
The averaging period and the payment-rate band are separate parts of the formula. The FAQ above uses total insured months for the average. Do not discard earlier records merely because a calculator’s payment-rate band has reached its maximum.
Our guide to the payment cap explains the rate-band issue. When your history includes several employers, prepare one chronological record rather than calculating an average of each employer’s average. Employer averages covering different lengths of time cannot simply be added and divided by the number of employers.
Check the underlying entries
Nenkin Net’s monthly-record guide explains how to inspect monthly pension information. Use that record as a starting point, then ask about any missing employment period or bonus entry before treating the resulting average as settled.
For your own worksheet, record the month, scheme, standard monthly remuneration and any standard bonus in separate columns. Include a source-reference column, such as the saved record’s page number. A second pass checking the number of months against the number used in the denominator can catch gaps or duplicate rows.
Label uncertainty in the estimate
If some records are still missing, save the result as provisional and write down the assumption. For example: "Bonus records for the first employer are not yet confirmed." That is more useful for planning than presenting an unsupported number as an official entitlement.
Enter the verified average in the pension withdrawal calculator, then review the complete withdrawal guide before applying. The calculator cannot determine whether taking a withdrawal is preferable to preserving your pension history, and its result is not a payment decision from Japan Pension Service.