Japan
Taxed as business or miscellaneous income at national 5-45%, plus a 2.1% surtax and 10% local inhabitant tax (~55% top combined), with National Pension and Health Insurance paid in full by the individual. Crypto is taxed at fair value on receipt as ordinary income.
Business income (事業所得) if an ongoing self-employed activity, otherwise miscellaneous income (雑所得); aggregated into total income, not capital gains.
National 5-45% progressive + 2.1% reconstruction surtax + flat 10% local inhabitant tax + 3-5% business enterprise tax; ~55% top combined.
Sole proprietors self-pay National Pension (~JPY 17,000/month) + National Health Insurance (income-based, full premium, no employer share).
Blue Return (青色申告) - proper bookkeeping unlocks up to JPY 650,000 special deduction plus loss carry-forward.
Legal and regulated; USDC received as service pay is income at fair market value on receipt, taxed at progressive rates up to ~55%. The proposed flat-20% crypto reform targets investment disposal gains, NOT compensation received.