Update history
tax-calc navi update history
Tax, social-insurance, and calculation-engine changes are recorded by date.
2026-09-04
Aligned guide figures with the calculator engine and improved legacy language URLs, source labels, dates, related links, and the salary-increase page.
2026-08-18
Added the part-time eligibility model, three-language income pages, official source registry, report CSV, and build-time sitemaps.
2026-08-10
Updated 2026 income tax, child-support contribution, and employee-insurance parameters.
2026-04-01
Recorded the contract-based expected-income handling for dependent certification.
Rule version
Current calculator version: 2026.1. Prepared by the operations team; no individual tax or social-insurance professional review is claimed.
Frequently asked questions
What if I find a rule error?
Use the data-error report page with the page, date, inputs, and official source. Do not submit personal information.
Complete your income details for a salary report →