calculate_year_end_adjustment

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Year-end adjustment (年末調整) for 2026 from the National Tax Agency's 令和8年分 booklet: the printed 給与所得控除後の給与等の金額 table (1,103 rows), the income-adjustment deduction, social/life/earthquake insurance deductions, spouse, specified-relative (19-22 with income), dependant, disability, widow/single-parent/student and basic deductions, the year-end tax bracket table, the housing-loan credit and the 2.1% reconstruction surtax. Returns every box of the 源泉徴収簿 (⑦ to ㉗) and whether the difference is a refund or a collection. Pay figures are for the whole calendar year, bonuses included. Pass only what the employee declared on their forms; the tool does not assume a spouse, dependants or insurance. Anyone paid 20,000,000 yen or more is outside 年末調整 and the tool says so. Medical, donation and casualty-loss deductions are not part of 年末調整 (they need a tax return) and resident tax is never involved.