https://sa.www4.irs.gov/irfof/lang/en/irfofgetstatus.jspAdd a description here
https://apps.irs.gov/app/tax-withholding-estimator
https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbarAdd a description here
https://www.irs.gov/help/tools
https://www.irs.gov/payments
https://www.fincen.gov/boi