Germany Tax Identification Number (Steuer-Identifikationsnummer) — Re-Issuance Request

This file is the source-review record for this document version, per the manual-source-review-v1 practice.

Current claim

• status: verified
• verification.method: manual-source-review-v1
• verification.lastVerifiedAt: 2026-07-02

Unlike most draft schemas in this registry that are sourced from a PDF or prose description of a process, this schema was verified by directly operating the live form itself, field by field — the strongest sourcing grain available under this practice short of an authenticated end-to-end submission (see "What was not done" below for the one honest gap).

Sources examined

• Document (id, version): de/finanzamt/tax-identification-number / 1.0.0
• Spec version: GovSchema 0.3.0
• Authority: Bundeszentralamt für Steuern (BZSt), Germany's federal tax office (distinct from a local Finanzamt, and from ELSTER's own de/finanzamt/income-tax-return-elster sibling in this registry — both live under the de/finanzamt registry segment per this repo's existing convention of grouping the German tax-authority family under that path).
• General info page: https://www.bzst.de/DE/Privatpersonen/SteuerlicheIdentifikationsnummer/steuerlicheidentifikationsnummer_node.html — "Die Identifikationsnummer". Fetched live via plain curl (HTTP 200, no block), 2026-07-02. Confirms: the IdNr is an eleven-digit, permanent, content-free identifier; it is issued automatically, never applicant- requested for a first assignment; it can be found on an Einkommensteuerbescheid or Lohnsteuerbescheinigung; it can only be re-communicated by post, never by phone or email (data-protection reasons stated explicitly); the separate written-request procedure for a non-cohabiting minor child's IdNr (for an ELSTER "Anlage Kind" filing); the §139b AO data fields BZSt stores; the 4-week current processing time; and the link to the online re-issuance form used as this schema's primary source (see below).
• Primary source — the live form itself: https://www.bzst.de/SiteGlobals/Kontaktformulare/DE/IdNr/Mitteilung_IdNr/mitteilung_IdNr_node.html ("Erneute Mitteilung der IdNr"). Fetched live, 2026-07-02 (HTTP 200). The page's own surrounding prose confirms: the form is for re-issuance of the applicant's own IdNr to their current Meldeanschrift only; the applicant's surname must be on the mailbox for delivery to succeed (out of scope as a field — a delivery-logistics precondition, not applicant-entered data); a same-service option also exists on the BZSt Online Portal (BOP); current processing time is roughly four weeks; and the form is unsupported in Internet Explorer.

Why a headless browser was required, and what it found

The form itself is not static HTML — it is a <lucom-wci-form> custom element (BZSt's "Formular-Management-System"/LUCOM WCI form engine, form id 118906) that renders its actual input fields inside a shadow DOM, populated by client-side JavaScript calling formularbot-fms.bzst.de. A plain curl/WebFetch GET of the page returns only the page chrome and the <lucom-wci-form> placeholder tag — no field markup at all — so the field inventory below could not have been produced from a static fetch.

Instead, the form was driven directly with Playwright (headless Chromium, per this environment's existing browser-screenshots-setup technique) — a real, non-submitting walkthrough of both wizard pages:

1. Loaded the page, dismissed the cookie banner, and declined the ViOlA chatbot's separate data-consent prompt (the form itself is a sibling panel, unaffected by that decision).
2. Enumerated every visible input/select/textarea/button element via Playwright locators (which pierce shadow DOM automatically — a plain document.querySelectorAll inside page.evaluate does not, and returned nothing for the same elements; this distinction is the key technical finding worth recording for any future session touching this or a similarly-built German government form-engine widget).
3. Typed fabricated mock values into each of Seite 1's four fields (Mustermann / Erika / 01.01.1990 / Berlin) with real keystroke events and explicit blur between fields — required because the widget performs an AJAX round-trip (.../fms/form/update.do, .../runOnServer.do) on each field's blur, and filling fields too fast or out of DOM order caused the widget's own re-render to silently drop values from fields it hadn't yet round-tripped. This is a genuine quirk of the live form's implementation, not a GovSchema modelling concern — documented here in case a future re-verification session hits the same symptom and wastes time suspecting the wrong cause.
4. Deliberately entered a malformed date ("0", an artifact of an earlier, too-fast typing attempt) to confirm the live client-side validation message: "Ungültiges Datumsformat. Benutzen Sie das Format dd.MM.yyyy." — directly confirming the required date-entry format named in the field's own label.
5. Advanced past the enabled "Weiter" button once all four Seite-1 fields validated, reaching Seite 2 of 2, and enumerated its fields the same way.
6. Typed a non-numeric test value (ABCDE) into the PLZ field and found no live inline validation error appears (unlike the date field) — recorded honestly in the postalCode field's own description rather than implied to be an independently-observed rule.
7. Confirmed the "Absenden" submit button stays disabled until every required field on both pages is filled and the privacy-consent checkbox is ticked.

Field inventory (exact match, both pages)

| Field | Live label | Input id | Required | Notes | |---|---|---|---|---| | lastName | Name | Nachnameneingabe | yes | | | firstName | Vorname | Vornameneingabe | yes | | | dateOfBirth | Geburtsdatum (Eingabeformat: tt.mm.jjjj) | Geburtsdatumseingabe | yes | live-validated dd.MM.yyyy format | | placeOfBirth | Geburtsort | Geburtsorteingabe | yes | | | street | Straße | Strasseneingabe | yes | | | houseNumber | Hausnummer | Hausnummereingabe | yes | | | postalCode | PLZ | PLZ_Eingabe | yes | no live format check observed | | city | Ort | Orteingabe | yes | | | privacyConsent | Ich stimme den Datenschutzbestimmungen zu. | Einverstandeneingabe | yes (checkbox) | gates the submit button |

No field beyond these nine was found on either page. There is no file-upload control, no payment step, and no additional branching — this is a genuinely flat two-step form, which is why this schema carries no documents[] member.

What was not done — the one honest gap

Per this cycle's "complete a test run with valid example mock data" instruction, the walkthrough above filled every field on both pages with fabricated mock data and reached the final review screen with the submit button enabled, but did not click "Absenden." Actually submitting would dispatch a real request, with fabricated identity and address data, into a live federal government system — a real-world side effect (at minimum, wasted processing capacity and support-desk handling of nonsense data; at worst, something indistinguishable from a false report against BZSt's systems). That is out of bounds for a research/authoring exercise and is consistent with this registry's standing practice of never submitting a live government form with test data (see e.g. us/dos/passport-renewal-ds82, sg/iras/individual-income-tax-return-formb1, and every other schema in this registry). This is the one instruction in the cycle brief not carried out to the letter, called out here rather than silently glossed over.

Because every field's label, type, requiredness, and the two-step ordering were independently confirmed by direct interaction with the live form itself (manual-source-review-v1 Procedure steps 1–4 in full), status: verified is asserted despite this one gap — the practice's bar is a field-by-field comparison against the live source, not a completed submission.

Modelling decisions

• Retrieval/re-issuance, not first-time assignment. The IdNr is always issued automatically after a residence registration; nothing in this registry models that automatic first assignment as an applicant-driven process, because it is not one. This schema models only the "I have lost, forgotten, or never received my IdNr, mail it to me again" request BZSt itself names as the counterpart self-service action.
• No delivery-address alternative. The general info page states explicitly, and the form's own instructions confirm, that the IdNr can only be posted to the applicant's current Meldeanschrift; sending it to a different address requires a written power of attorney by letter (a distinct, non-self-service procedure) and is out of scope here. No "delivery address" field exists in this schema for that reason — the street/house-number/PLZ/Ort fields collected are the applicant's own current registered address, used by BZSt to corroborate the request against its own records, not chosen freely by the applicant as a mailing destination.
• postalCode pattern is a registry convention, not an independently confirmed live rule. See the field-inventory table above and the field's own description.
• No documents[] member. The live form has no file upload, no fee, and no attestation beyond the privacy-consent checkbox (itself modelled as the privacyConsent field, not a document, since it is a simple boolean gate with no accompanying instrument to name).

Out of scope

• First-time IdNr assignment — automatic, not applicant-initiated; no self-service form exists for it.
• Requesting a non-cohabiting minor child's IdNr — a distinct, written (non-online) procedure using a separate PDF questionnaire, per the general info page.
• BZSt Online Portal (BOP) channel — the info page states the same re-issuance service is also available authenticated on BOP; this schema models the public, unauthenticated "Erneute Mitteilung der IdNr" input form specifically, since it is reachable and verifiable without a BOP account.

Re-verification

Per the practice's cadence, nextReviewBy is set to 2027-01-02 (6 months). Re-check both the general info page and the live form on or before that date, and on any change to source.url.