https://www.iras.gov.sg/taxes/withholding-tax/payments-to-non-resident-professional-(consultant-trainer-coach-etc-)/treatment-of-income-for-non-resident-professional
IRAS | Treatment of income for non-resident professional
Non-resident professionals are subject to 15% withholding tax on gross income. They may opt to be taxed at 22% (24% for income due and payable to the...
treatment of incomeirasnonresidentprofessional
https://www.irs.gov/charities-non-profits/identification-and-treatment-of-income-from-mailing-lists
Identification and treatment of income from mailing lists | Internal Revenue Service
Tax Exempt and Government Entities Issue Snapshots - Identification and Treatment of Income from Mailing Lists
treatment of incomeinternal revenue servicemailing listsidentification