- What starts the clock
- The start of the person's paid National Pension contribution period, or the start of their Employees Pension Insurance enrollment period.
- How long
- At least six months must have accumulated: for National Pension, months during which premiums were actually paid, not merely enrolled but unpaid months; for Employees Pension Insurance, at least six months of combined enrollment including mutual aid association periods.
- What is lost
- the source does not state what happens if this is missed
To be eligible for the lump sum withdrawal payment, a person must have at least six months of paid National Pension contribution months (unpaid enrolled months do not count), or at least six months of Employees Pension Insurance enrollment period including mutual aid association periods.
What the source does not say
The page distinguishes National Pension periods, which must be premium paid months and explicitly exclude unpaid enrolled months, from Employees Pension Insurance periods, a straight enrollment period count, and applies the six month threshold separately to each system rather than as one combined figure. The page does not state what happens to contributions below six months, for example whether they can later be combined with a subsequent period of insured status. The Promotion and Mutual Aid Corporation for Private Schools of Japan states the same six month threshold for its own Employees Pension Insurance members in different wording: kosei nenkin hoken no hihokensha kikan ga 6 kagetsu ijou de aru koto (that the Employees Pension Insurance insured period is six months or more).