What is the statutory monthly hour ceiling for a 31-day month?

A 31-day calendar month has a statutory maximum frame of 177.1 hours [(31 ÷ 7) × 40 hours].

What happens when worked hours fall short of the required frame?

Hour shortfalls can either be deducted from current month's base salary or carried forward to be worked off during the next settlement month as agreed in company labor accords.

JapanUpdated for 2026Finance

Japan Flextime Overtime Settlement Calculator 2026

Calculate statutory monthly overtime settlements under Japan's Flextime system (Labor Standards Act Art. 32-3) comparing actual worked hours against statutory period caps.

Working Hours & Schedule Salaries & Monthly Wages Labor Law & Employment

Calculated Result

Flextime Overtime Premium Pay (1.25x)

¥49,225

Overtime Hours Exceeding Cap

17.9hours

Calculator Inputs

Calendar Days in Settlement Month

Actual Total Hours Worked in Month

Quick select:

Base Hourly Wage (JPY/Hour)

Quick select:

Flextime Overtime Premium Pay (1.25x)

¥49,225

Overtime Hours Exceeding Cap

17.9hours

Statutory Monthly Hour Frame

177.1 hours

Shortfall Hours

0 hours

Cumulative hours exceed the monthly cap; 1.25x premium pay applies to all surplus hours.

Hours Distribution

Statutory Base Frame

177.1(91%)

Payable Overtime

17.9(9%)

Calculated under Labor Standards Act Art. 32-3. Overtime is assessed strictly against monthly calendar period frames (177.1h for 31-day months, 171.4h for 30-day months).

This calculator is a mathematical model for general financial estimation, planning, and educational guidance. Results depend on your inputs and standard formulas, and do not constitute binding financial, tax, or investment advice. Always consult a qualified professional before making financial decisions.

Official Statute: 労働基準法第32条の3 (フレックスタイム制・清算期間における法定労働時間の総枠算定及び時間外割増賃金精算基準)Last Verified: 2026-09-03

Calculation Methodology

Statutory Frame = (Calendar Days ÷ 7) × 40 Hours; Overtime Hours = Max(Actual Hours - Statutory Frame, 0).

Frequently Asked Questions

No. Working over 8 hours on a single day does not trigger overtime. Overtime premium pay is only triggered when cumulative hours exceed the monthly statutory cap.

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Japan Flextime Overtime Settlement Calculator 2026

Calculator Inputs

Hours Distribution

Calculation Methodology

Frequently Asked Questions

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