Understanding tax identification in the United States

In the United States, tax identification can involve different numbers depending on the business or individual situation. Businesses may use employer or state tax identifiers, while individuals may use personal tax identification references for tax-related processes.

Sales tax is generally administered at state level, meaning requirements can vary depending on where a business operates, sells goods or provides taxable services.

Sales tax and state registration

Businesses that sell taxable goods or services may need to register with the relevant state tax authority. The registration process may require business information, documentation and ongoing sales tax reporting.

Companies operating in multiple states may need to review obligations separately for each jurisdiction, depending on presence, activity and applicable state rules.

Validate tax identifiers with TIN Check

TIN Check helps businesses validate tax identification numbers through a professional verification workflow. This can support onboarding, supplier review, accounting checks and internal compliance processes.

For recurring validation needs, API access can be integrated directly into billing, onboarding, customer registration or compliance systems.