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In order to pay many types of counterparties, businesses need to collect and track Social Security Numbers (SSN) or Employer Identification Numbers (EIN). This is required in cases where you need to file a tax document, such as a 1099, and can also support compliance and control processes inside your company.

Modern Treasury now supports securely collecting and recording SSNs and EINs for counterparties. There are two ways to add a SSN or EIN to a counterparty.

The first option is through our counterparty invitation product. When inviting a counterparty to be paid or charged, you can request they include their taxpayer identifier.

The counterparty would then be able to provide their taxpayer identifier when completing their invitation.


If you collect your counterparty’s SSN or EIN in your own application, the second option is to provide it to Modern Treasury via our API when creating a counterparty.

curl --request POST \
  -u ORGANIZATION_ID:API_KEY \
  --url https://app.moderntreasury.com/api/counterparties \
  -H 'Content-Type: application/json' \
  -d '{
    "name": "Kenner, Bach and Ledeen",
    "taxpayer_identifier": "111111111",
    "accounts": [
      {
        "account_type": "checking",
        "routing_details": [
          {
            "routing_number_type": "aba",
            "routing_number": "121141822"
          }
        ],
        "account_details": [
          {
            "account_number": "123456789"
          }
        ]
      }
    ]
  }'

This feature critical to support our marketplace, real estate, and logistics customers. If you want to learn more about using Modern Treasury to manage payout flows with SSNs and EINs, schedule time with our team today.

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