# BT-50 Buyer Address Line 1

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

## Quick answer

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

- [Validate XML](/en/xrechnung-validator?source=resource&bt=BT-50)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&bt=BT-50)

## 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.

Use this field for the buyer street, building, or post-box line when it forms part of the postal address.

## 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

BT-50 is optional. BR-10 requires the buyer postal address group BG-8, not this street line by itself.

## What goes wrong often

Avoid values like: Str. 1, AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

## Examples in context

Use this field for the buyer street, building, or post-box line when it forms part of the postal address.

BT-50 is optional. BR-10 requires the buyer postal address group BG-8, not this street line by itself.

## Valid Examples

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

## Invalid Examples

- Str. 1
- AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

## Related Fields

Use this field for the buyer street, building, or post-box line when it forms part of the postal address.

- [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:
0..1

### Requirement:
Optional

### Max Length:
100 characters

### Since Version:
Optional in all XRechnung versions

## 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
```

## 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)

Download requires an account. Subscriptions from €10/month with annual billing (excl. taxes), or €5 per conversion (excl. taxes) without a subscription.

## Why the standard cares about this field

### Business Context
Use this field for the buyer street, building, or post-box line when it forms part of the postal address.

### Legal Requirement
BT-50 is optional. BR-10 requires the buyer postal address group BG-8, not this street line by itself.

## 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/)
- [XRechnung Standard](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)