The Tax ID displayed in Settings → Company info → Edit Subsidiary can be retrieved through the API via the related bill_from contact entry by calling:
GET /api/v2/subsidiaries/{id}?include=bill_from
The Tax ID is returned in the included section, inside the contact_entries object, where type is bill_from, under the vat attribute.
Timestamp when the subsidiary was archived, or null if active.
Billing address details used on invoices issued by this subsidiary.
Custom email domain linked to this subsidiary for outgoing communication.
ID of the custom domain linked to this subsidiary for email sending.
Default bank account used for outgoing payments from this subsidiary.
ID of the default bank account for this subsidiary.
Default document type template applied to invoices from this subsidiary.
Default document type (PDF template) applied to invoices from this subsidiary.
Default tax rate applied to invoice line items for this subsidiary.
ID of the default tax rate for this subsidiary.
E-invoicing configuration for this subsidiary (formats, routing, transmission settings).
E-invoicing identity details for this subsidiary (PEPPOL endpoint, routing identifiers).
Integration type used for exporting documents from this subsidiary.
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Monthly facility/overhead costs allocated to this subsidiary.
Breakdown of facility costs into component categories.
Facility costs in the organization's default currency.
Facility costs normalized to a common currency for cross-subsidiary comparison.
The unique identifier of this subsidiary.
Linked accounting or export integration for this subsidiary.
The URL of the logo image used on invoices for this subsidiary.
The format template for generating invoice numbers for this subsidiary (e.g. INV-{year}-{number}).
The scope that determines invoice number sequencing — whether numbers are shared across the organization or unique per subsidiary.
Display name of the subsidiary legal entity.
The organization this subsidiary belongs to.
When true, the delivery date is shown on invoices generated for this subsidiary.
The status of this subsidiary, indicating whether it is active or archived.