# BT-32 Seller tax registration identifier

Tax registration identifier of the seller used in domestic tax processes.

## Quick answer

> **Seller details**: Who issued the invoice and how the recipient can identify that business reliably.

- [Validate XML](/en/xrechnung-validator?source=resource&bt=BT-32)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&bt=BT-32)

## In plain language

This field complements the VAT ID when the tax administration or the buyer expects the domestic tax number as well.

## What you usually enter here

Domestic tax registration number

Typical valid values include: 123/4567/8901

Optional according to EN 16931-1.

## Where the field sits

BT-32 belongs to the Seller part of the invoice. UBL 2.1 Syntax: Invoice › cac:AccountingSupplierParty › cac:Party › cac:PartyTaxScheme[cac:TaxScheme/upper-case(cbc:ID)!="VAT"] › cbc:CompanyID. CII (UN/CEFACT) Syntax: rsm:CrossIndustryInvoice › rsm:SupplyChainTradeTransaction › ram:ApplicableHeaderTradeAgreement › ram:SellerTradeParty › ram:SpecifiedTaxRegistration › ram:ID[@schemeID="FC"].

## Valid Examples

- 123/4567/8901

## Related Fields

- [BT-31 Seller VAT Identifier](/resources/xrechnung/bt-31-seller-vat-identifier)
- [BT-63 Seller tax representative VAT identifier](/resources/xrechnung/bt-63-seller-tax-representative-vat-identifier)

## XML mapping and field facts

Open the technical reference if you need XML paths, validator rule codes, legal wording, or schema-specific mapping details.

### Field ID:
BT-32

### Data Type:
identifier

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
30 characters

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:AccountingSupplierParty/cac:Party/cac:PartyTaxScheme[cac:TaxScheme/upper-case(cbc:ID)!="VAT"]/cbc:CompanyID
```

### CII (UN/CEFACT) Syntax
```
/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTradeParty/ram:SpecifiedTaxRegistration/ram:ID[@schemeID="FC"]
```

## Create an XRechnung from your PDF

The converter reads the invoice and shows the fields it found before download, so you can check and correct the values. No PDF? Fill in the XRechnung directly in the form.

- [Convert invoice](/en/pdf-to-xrechnung)
- [Fill in XRechnung in the form](/en/create-xrechnung)

Trying it and buying a single conversion work without an account. Subscriptions from €10/month with annual billing (excl. taxes), or €5 per conversion (excl. taxes) without a subscription.

## Official sources and tools

- [KoSIT Validator](https://erechnungsvalidator.service-bw.de/)
- [XRechnung Standard](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)