Tax portals, calculators, and reference guides

e-Tax is the national tax site for filing returns and paying taxes; eLTAX is the unified municipal/city tax portal, a separate system from e-Tax with its own authorization and filing quirks (see the record on practical eLTAX issues). Useful calculators mentioned in the chat: japantaxcalculator.com, a rough tax estimate tool (defaults to 個人事業主, with a separate checkbox for employees); Yayoi's calculator comparing a sole proprietor to a company; Yayoi's calculator for a freelancer/sole proprietor's taxes; kaikei7.com's income tax calculator; the HTM payroll calculator, free and, per several checks, precisely matching real payslips for social insurance and pension, though accurate only for a central Tokyo location; and the HTM year-end adjustment calculator, which at the time of the chat discussion had not been updated for 2025 formulas. Russian-language guides on inoshi.cc, made by a chat participant, include: a guide to claiming a consumption tax refund for new companies, with a calculator; a guide to filing a personal tax return (kakutei-shinkoku); and a historical currency-rate aggregator. Official sources mentioned in the chat: the NTA's general English-language tax section; the official NTA income tax guide (PDF); the Tokyo Metro tax guidebook; an article on writing off bad debts; an article on the rules for losing the consumption tax exemption when capital changes; JETRO's page on the consumption tax exemption; and MIPRO's official corporate tax guide. Source: https://www.eltax.lta.go.jp/ — Official eLTAX portal for filing municipal and prefectural taxes.. Source: https://japantaxcalculator.com/ — Rough online tax calculator for sole proprietors/employees in Japan.. Source: https://www.yayoi-kk.co.jp/shinkoku/oyakudachi/simulation/ — Yayoi's calculator for a freelancer/sole proprietor's taxes.. Source: https://kaikei7.com/zeikin/shotokuzei/ — Online income tax calculator.. Source: https://www.htm.co.jp/calculators-monthly-payroll-japan.htm — Free HTM payroll calculator, closely matching real payslips for a central Tokyo location.. Source: https://inoshi.cc/ru/guides/consumption-tax-refund — Guide with a calculator for the benefit of claiming a consumption tax refund for new companies.. Source: https://inoshi.cc/ru/guides/kakutei-shinkoku — Guide to filing a personal tax return (kakutei-shinkoku).. Source: https://www.nta.go.jp/english/taxes/individual/12010.htm — General English-language NTA section on individual taxes.. Source: https://www.nta.go.jp/english/taxes/individual/pdf/incometax_2024/01.pdf — Official NTA income tax guide (PDF).. Source: https://www.tax.metro.tokyo.lg.jp/documents/d/tax/guidebook2024e#page=26 — Tokyo Metro tax guidebook, 2024 edition.. Source: https://toma.co.jp/en/blog/jtg/allowance-doubtful-accounts-japanese-tax-law/ — Article on writing off bad debts under Japanese tax law..