💼 USA vs Japan Salary and Net Income 2026

Yes -- foreign workers employed in Japan are generally required to enrol in and contribute to the Japanese social insurance system (shakai hoken), including the kosei nenkin employee welfare pension, regardless of nationality. Contribution is mandatory for employees working regularly at qualified companies. The 9.15% employee contribution is deducted from payroll. When a foreign national who is not a Japanese citizen or permanent resident leaves Japan permanently, they can claim a lump-sum withdrawal payment (dattai ichijikin) within 2 years of leaving Japan. The dattai ichijikin refunds a portion of the paid-in pension contributions based on the number of months contributed (minimum 6 months required). Maximum refund: 5 years (60 months) of contributions regardless of total contribution period. The refund is calculated as standardised monthly remuneration times the applicable refund rate (5-year maximum rate approximately 9.7 times the standardised monthly remuneration for those over 5 years). The refund is subject to a 20.42% withholding tax (including reconstruction surtax) by Japan before payment. Countries with social security totalization agreements with Japan may have different provisions affecting contributions.

US citizens working in Japan face a double filing requirement -- both Japan taxes their Japan-source income as residents, and the US taxes their worldwide income as US citizens. The primary mechanisms preventing double taxation are: the Foreign Earned Income Exclusion (FEIE) allows US citizens to exclude $126,500 of foreign-earned income from US taxable income in 2026 (with the physical presence or bona fide residence test); the Foreign Tax Credit (FTC) allows a dollar-for-dollar credit against US tax liability for income taxes paid to Japan, substantially reducing or eliminating US residual tax liability; and the US-Japan Tax Treaty provides specific provisions on how various types of income are sourced and taxed. Since Japan's effective tax rates are broadly comparable to US rates for mid-level earners, the FTC typically offsets most or all residual US liability above the FEIE exclusion. US citizens should file both Japanese tax returns (through their employer's withholding for national income tax, self-file for any adjustments) and US returns (Form 1040 with Form 2555 and/or Form 1116). A US-qualified tax professional specialising in US-Japan cross-border taxation is highly recommended.

iDeCo (individual-type defined contribution pension -- kojin-gata kakutei kyoshutsu nenkin) is Japan's self-directed personal pension scheme introduced in 2017. It allows employed individuals to make voluntary contributions that are fully deductible from income tax and inhabitant tax. Maximum annual contributions depend on employment status: salaried employees at companies with company pensions can contribute up to JPY 240,000 per year; salaried employees without corporate pensions can contribute up to JPY 276,000 per year; self-employed can contribute up to JPY 816,000 per year. Investment returns within iDeCo grow tax-free. On withdrawal from age 60: lump-sum withdrawal benefits from the retirement income deduction (taisho shotoku kojo), significantly reducing tax on retirement income. For a professional in the 33% income tax bracket (plus 10% inhabitant tax = approximately 43% combined), contributing JPY 240,000 per year to iDeCo saves approximately JPY 103,200 in annual tax -- an effective return of 43% on the contribution before any investment return. iDeCo is one of the most tax-efficient savings mechanisms available to Japanese residents and is underutilised by both domestic workers and foreign professionals in Japan.

Japan's Startup Visa (formally the Foreign National Entrepreneur Support Program) allows foreign entrepreneurs to reside in Japan for up to 6 months to prepare to establish a business, before qualifying for the standard Business Manager visa (minimum investment JPY 5,000,000 or two full-time employees). The Startup Visa is issued at the discretion of designated local governments (currently including Tokyo, Osaka, Fukuoka, Aichi, and others) rather than the central government -- each local government operates its own program with slightly different requirements and support services. The entrepreneur must have a detailed business plan, show financial viability (typically evidenced by proof of sufficient funds), and agree to receive support from the local government's incubation programme. During the 6-month startup visa period the entrepreneur can legally reside in Japan and establish their company. Upon establishing the company with the required investment or employees, they can then apply for the regular Business Manager visa (5-year initial period). Japan's reformed Corporation Act (2015 onwards) streamlined company formation -- a Japanese GK (Godo Kaisha, similar to LLC) or KK (Kabushiki Kaisha, similar to corporation) can now be established within 1 to 2 weeks with JPY 1 minimum share capital for GK.

Japan's inheritance tax (sozoku zei) is among the world's most progressive -- with rates from 10% to 55% depending on the taxable inheritance amount. The tax applies to assets inherited by Japanese residents regardless of the decedent's nationality, and to Japanese assets inherited by non-residents. For resident expats, Japan's inheritance tax can be extremely significant: a basic exemption of JPY 30,000,000 plus JPY 6,000,000 per heir reduces the taxable base, but on amounts above JPY 600,000,000 the 55% rate applies. An expat who accumulates a JPY 200,000,000 investment portfolio and JPY 50,000,000 in real estate in Japan while resident may face substantial inheritance tax on their estate even after exemptions. Long-term Japan residents should be aware that Japan's inheritance tax applies to their worldwide assets (including non-Japan property and bank accounts) if they have resided in Japan for 10 or more years -- significantly widening the tax net. Japan has inheritance tax treaties with some countries but not the US -- US-Japan cross-border estates require specialist planning. The high inheritance tax is a key consideration for high-net-worth professionals planning multi-decade Japan residency.