Namibia
Net self-employment/business income at progressive rates up to 37% as ordinary income (no CGT). Crypto payouts are valued in NAD at receipt; whether foreign income is taxable can turn on Namibia's source-based rules.
Self-employment / business income, source-based, at individual progressive rates as ordinary income; Namibia has no capital gains tax.
Progressive PIT 0% up to N$100,000 then 17/20/...up to 37% (top 37% above N$1.5m) on net business profit.
Social Security Commission contributions are employment-based and low; the self-employed are not generally compelled on this income.
Self-assessment; self-employed/provisional taxpayers file returns and pay provisional tax twice yearly on estimated income.
No specific crypto tax law and no CGT; USDC payouts taxed as ordinary income if from a Namibian (or deemed-Namibian) source, valued in NAD at receipt.