For natural persons, that have tax residency other than the country of the account: Individual Certificate Form

For entities that have tax obligation additional to the country of the account: Entity Tax Residency Self-Certification Form

For controlling persons, that have tax residency other than the country of the account: Controlling Person Tax Residency Self-Certification Form

For natural persons, that are not-US tax liable: W8-BEN

For legal entities, that are not-US tax liable: W8-BEN-E

For customers (either natural persons or/and legal entities) that are US-tax liable: W9