# BT-66 Tax representative city

City of the seller tax representative postal address.

## Quick answer

City of the seller tax representative postal address.

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

- validate
- convert

## In plain language

City of the seller tax representative postal address.

City of the seller tax representative postal address.

The city completes the postal address that tax authorities and recipients may need to identify the fiscal representative.

## What you usually enter here

City or locality name

Typical valid values include: Berlin, Paris

Optional overall, but expected when the full tax representative address is provided.

## What goes wrong often

Avoid values like: , AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

## Examples in context

The city completes the postal address that tax authorities and recipients may need to identify the fiscal representative.

Optional overall, but expected when the full tax representative address is provided.

## Valid Examples

- Berlin
- Paris

## Invalid Examples

- AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

## Related Fields

The city completes the postal address that tax authorities and recipients may need to identify the fiscal representative.

- [BT-64 Tax representative address line 1](/resources/xrechnung/bt-64-tax-representative-address-line-1)
- [BT-67 Tax representative post code](/resources/xrechnung/bt-67-tax-representative-post-code)
- [BT-69 Tax representative country code](/resources/xrechnung/bt-69-tax-representative-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-66

### Data Type:
text

### Cardinality:
0..1

### Requirement:
Optional

### Max Length:
60 characters

### Since Version:
Conditional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:TaxRepresentativeParty/cac:PostalAddress/cbc:CityName
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeAgreement/ram:SellerTaxRepresentativeTradeParty/ram:PostalTradeAddress/ram:CityName
```

## Why the standard cares about this field

### Business Context
The city completes the postal address that tax authorities and recipients may need to identify the fiscal representative.

### Legal Requirement
Optional overall, but expected when the full tax representative address is provided.

## 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)