Tax Information

Tax Residency

Tax residency plays a crucial role in determining the applicable tax forms such as W-9s and W-8s. When updating tax residency information, it's important to submit all residencies each time an update is made. For instance, if a party has tax residencies in both the US and UK, and initially only the US residency was posted, any subsequent update that includes the UK must also re-include the US. This process serves as an attestation and helps maintain a comprehensive and accurate tax record.

    "tax_residency": {
      "date_of_declaration": "2023-08-03T04:08:15.819Z",
      "us_person": "string",
      "residencies": [
          "country": "string",
          "tin_type": "string",
          "tin_value": "string",
          "reason_tin_not_provided": "string",
          "reason_exempt_from_us_federal_income_tax": "string",
          "primary": true

Generate or Upload Tax Forms

CaliberX Tax APIs provide the ability to generate and sign W-9 and W-8BEN tax forms tailored to the specific tax residency information provided by the party(investor profile) involved. For more complex W-8s the APIs support uploading signed tax forms.


A W-9 form is an Internal Revenue Service (IRS) tax form that is used to confirm a person's name, address, and taxpayer identification number (TIN) for employment or other income-generating purposes. The confirmation can be requested for either an individual defined as a U.S. citizen or a person defined as a resident alien.

A W-9 form is also known as a Request for Taxpayer Identification Number and Certification form.


CaliberX supports auto generation and signing of W-9 forms


W-8 forms are Internal Revenue Service (IRS) forms that foreign individuals and businesses must file to verify their country of residence for tax purposes, certifying that they qualify for a lower rate of tax withholding.


CaliberX supports auto generation and signing of W-8BEN. All other W-8 types W-8BEN-E, W-8ECI, W-8EXP, and W-8IMY can be uploaded via the APIs