# BT-50 Buyer Address Line 1

The main address line identifying the buyer's postal address. Typically contains street name and number.

## Quick answer

The main address line identifying the buyer's postal address. Typically contains street name and number.

> **Buyer details**: Who receives the invoice and which buyer records or routing data must match.

## In plain language

The main address line identifying the buyer's postal address. Typically contains street name and number.

The main address line identifying the buyer's postal address. Typically contains street name and number.

Essential for delivery and correspondence with the buyer organization, especially important for public administration routing

## What you usually enter here

Free text for street and number

Typical valid values include: Wilhelmstraße 97, Marienplatz 8, Unter den Linden 1, Postfach 123456

Mandatory field for complete buyer identification according to EN 16931 and German e-invoice regulations

## What goes wrong often

Avoid values like: Str. 1, AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Relevant rule codes: BR-CO-26

## Examples in context

Essential for delivery and correspondence with the buyer organization, especially important for public administration routing

Mandatory field for complete buyer identification according to EN 16931 and German e-invoice regulations

## Valid Examples

- Wilhelmstraße 97
- Marienplatz 8
- Unter den Linden 1
- Postfach 123456
- Rathausplatz 1

## Invalid Examples

- Str. 1
- AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

## Related Fields

Essential for delivery and correspondence with the buyer organization, especially important for public administration routing

- [BT-44 Buyer Name](/resources/xrechnung/bt-44-buyer-name)
- [BT-51 Buyer address line 2](/resources/xrechnung/bt-51-buyer-address-line-2)
- [BT-52 Buyer City](/resources/xrechnung/bt-52-buyer-city)
- [BT-53 Buyer Post Code](/resources/xrechnung/bt-53-buyer-post-code)
- [BT-54 Buyer country subdivision](/resources/xrechnung/bt-54-buyer-country-subdivision)
- [BT-55 Buyer Country Code](/resources/xrechnung/bt-55-buyer-country-code)

## 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-50

### Data Type:
text

### Cardinality:
1..1

### Requirement:
Mandatory

### Max Length:
100 characters

### Since Version:
XRechnung 1.0+

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:AccountingCustomerParty/cac:Party/cac:PostalAddress/cbc:StreetName
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:PostalTradeAddress/ram:LineOne
```

## Validation Rules

### BR-CO-26
BR-CO-26

## Why the standard cares about this field

### Business Context
Essential for delivery and correspondence with the buyer organization, especially important for public administration routing

### Legal Requirement
Mandatory field for complete buyer identification according to EN 16931 and German e-invoice regulations

## FAQ

### How should I format addresses for German public authorities?
Use the complete official address as listed in public directories. For ministries, include the full street address, not just "Wilhelmstraße 97" but the complete official location.

### Should I use the department address or main organization address?
Use the address where invoices should be sent for processing and payment. This might be different from the main organization address, especially for large public institutions.

### What about PO Boxes for public institutions?
Many German public institutions use PO Boxes for invoice processing. Format as "Postfach [number]" (e.g., "Postfach 123456"). Check with the institution for their preferred invoice delivery address.

## Official sources and tools

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