When a fixed salary changes significantly, a monthly revision (Zuiji Kaitei) must be filed within a few months. Learn how to determine eligibility and process it in WorkVell.
Zuiji Kaitei (随時改定) is required when a fixed salary change causes the actual remuneration to differ by 2 or more standard grades from the current standard monthly remuneration.
Was this article helpful?
Overtime Pay Calculation
Wages paid at legally-mandated premium rates for overtime, late-night, and holiday work.
Annual Santei Kiso (Standard Monthly Remuneration Revision)
Every year, companies must report April-June salary data to determine new standard monthly remuneration. This guide explains the process.
Income Tax & Withholding
Companies withhold income tax from each paycheck and remit it to the tax office on behalf of employees.
Withholding Tax Calculation for Bonus Payments
Bonus withholding is calculated based on the previous month's salary. Learn how it works.
Social Insurance Deductions
Overview of social insurance deductions withheld from wages (health, pension, employment, nursing-care insurance).
Processing Social Insurance Enrollment and Withdrawal
Export social insurance enrollment/withdrawal forms for new hires and terminations.
Income Tax & Withholding
Companies withhold income tax from each paycheck and remit it to the tax office on behalf of employees.
Monthly Remuneration Change (Ad-hoc Revision)
Process ad-hoc social insurance remuneration revisions when salary changes by 2 or more grades.
Annual Social Insurance Remuneration Report (July Declaration)
Process the annual standard monthly remuneration declaration submitted every July.
Employment Insurance (雇用保険) Deductions Explained
Learn how employment insurance premiums are calculated and deducted from your paycheck.
Employment Insurance: Acquisition and Loss of Eligibility Procedures
When an employee joins or leaves, employment insurance eligibility must be reported to Hello Work (public employment security office). This guide explains the process in WorkVell.
Social Insurance Deductions
Overview of social insurance deductions withheld from wages (health, pension, employment, nursing-care insurance).
Processing Social Insurance Enrollment and Withdrawal
Export social insurance enrollment/withdrawal forms for new hires and terminations.
