Bangladesh
Business income on progressive slabs (top ~25–30%) with mandatory NBR filing. Critically, crypto/USDC is effectively banned under forex/AML rules — receiving on-chain may itself be unlawful. Get legal advice.
'Income from business or profession' under the Income Tax Act 2023 — normal individual rates.
Progressive: tax-free up to BDT 375,000, then ~10% up to ~25–30% top (verify current Finance Act). Small minimum tax once above the threshold.
No general social-security tax on self-employment income.
All TIN holders must file annually via etaxnbr.gov.bd, even with no tax due. No widely-used presumptive % scheme for this.
Crypto is effectively prohibited (Bangladesh Bank: breaches forex/AML law) and is not legal tender. Receiving USDC on-chain raises legality issues beyond tax — a major red flag.