Overtime Pay Calculator - Overtime, Late-Night & Holiday Wage Premiums (Japan)
Enter your hourly wage plus overtime, late-night (10pm-5am), and statutory holiday hours to instantly calculate the premium wage breakdown and total under Japan's Labor Standards Act Article 37, including the 50%+ premium for overtime beyond 60 hours/month.
Wage premium rates under Labor Standards Act Article 37 (Japan)
The minimum statutory premium rates for overtime, late-night, and holiday work in Japan.
| Category | Premium rate | Applies when |
|---|---|---|
| Overtime (時間外労働) | 25%+ | Work beyond statutory hours (8 hours/day, 40 hours/week) |
| Overtime beyond 60h/month | 50%+ | The portion of monthly overtime exceeding 60 hours (applies to all company sizes since April 2023) |
| Late-night work (深夜労働) | 25%+ | Work between 10pm and 5am (stacks with overtime/holiday premiums if they overlap) |
| Statutory holiday work (法定休日労働) | 35%+ | Work on the mandated weekly (or 4-in-4-weeks) statutory rest day |
| Late-night overtime | 50%+ (75%+ beyond 60h) | Overtime hours that also fall between 10pm-5am (25%+25%, or 50%+25% beyond 60h/month) |
| Late-night statutory holiday work | 60%+ | Statutory holiday hours that also fall between 10pm-5am (35%+25%) |
Source: Japan's Ministry of Health, Labour and Welfare, based on Labor Standards Act Article 37 and its enforcement regulations (as of July 2026).
Tips
- If you're on a monthly salary, divide it by your contracted monthly working hours to get an hourly rate first — the wage unit converter (money.salary_tax.convert) can do this for you.
- The 50%+ premium for monthly overtime beyond 60 hours has applied to companies of every size since April 2023 — small and mid-sized employers are no longer exempt.
- A "statutory holiday" isn't necessarily a Saturday or Sunday — it's whichever weekly (or 4-in-4-weeks) rest day your employer designates in its work rules, so check your company calendar.
- Late-night hours (10pm-5am) stack with overtime or holiday premiums when they overlap — for example, late-night overtime is 25%+25% = 50%.
- This tool uses the statutory minimum premium rates. If your employment contract or collective agreement specifies higher rates, those take precedence.
Frequently asked questions
Side Note — Why does the premium rate change at 60 hours a month?
The 50%+ premium for overtime beyond 60 hours a month was actually introduced back in a 2010 revision to Japan's Labor Standards Act. Small and mid-sized businesses were granted a grace period at the time, so only large companies applied it at first. That grace period only ended in April 2023, making universal enforcement a fairly recent development.
The policy's goal is to make chronic long hours economically unattractive for employers, nudging them to cut overtime rather than pay for it. The 60-hour line sits below the widely cited "karoshi (death from overwork) line" of roughly 80 hours of monthly overtime — the idea being to apply financial pressure before employees ever reach that danger zone.
The late-night premium (10pm-5am, 25%+) rests on different reasoning than the overtime or holiday premiums. Rather than compensating for total hours worked, it compensates for working against the body's natural rhythm — which is why it simply stacks on top of whichever other premium (overtime or holiday) already applies.
This tool's split of the 60-hour excess between regular and late-night overtime is only an approximation based on the ratio of hours you entered — real payroll systems tally each day's hours in sequence to determine the exact split. Confirm the precise figures with your employer's payroll department.