Saudi Arabia
No personal income tax — a Saudi/GCC national pays nothing. The catch is structural: non-GCC foreigners generally can't freelance as individuals and use a company taxed at 20% CIT.
Saudi/GCC nationals: not subject to personal income tax. Foreign residents: business income falls into the corporate net and usually needs a licensed entity.
0% employment income for all. Nationals' self-employment: ~0%. Foreign-individual business income via a company: 20% corporate income tax.
GOSI applies to nationals (employment-based); not a freelancer levy on foreign contractors.
Freelance/sole-trader status is largely reserved for Saudi/GCC nationals. Most non-GCC foreigners must use a licensed company (then 20% CIT).
No specific personal crypto tax; crypto is not legal tender. For nationals, receiving USDC changes nothing.