# BT-156 Invoice line VAT category tax amount

The VAT amount for the VAT category of the invoice line.

## Quick answer

The VAT amount for the VAT category of the invoice line.

> **Line items**: The goods or services on each invoice line, including quantities, prices, and VAT.

## In plain language

The VAT amount for the VAT category of the invoice line.

The VAT amount for the VAT category of the invoice line.

VAT amount calculated for the line item.

## What you usually enter here

Decimal number with up to 2 decimal places

Typical valid values include: 190.00, 17.50, 0.00

Mandatory for each invoice line according to EN 16931-1.

## What goes wrong often

Avoid values like: -19.00, 19,00, 19.999

Relevant rule codes: BR-2

## Examples in context

VAT amount calculated for the line item.

Mandatory for each invoice line according to EN 16931-1.

## Valid Examples

- 190.00
- 17.50
- 0.00

## Invalid Examples

- -19.00
- 19,00
- 19.999

## Related Fields

VAT amount calculated for the line item.

- [BT-151 Invoice line VAT category code](/resources/xrechnung/bt-151-invoice-line-vat-category-code)
- [BT-152 Invoice line VAT category rate](/resources/xrechnung/bt-152-invoice-line-vat-category-rate)
- [BT-116 VAT Category Taxable Amount](/resources/xrechnung/bt-116-vat-category-taxable-amount)
- [BT-117 VAT Category Tax Amount](/resources/xrechnung/bt-117-vat-category-tax-amount)

## 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-156

### Data Type:
amount

### Cardinality:
1..1

### Requirement:
Mandatory

### Since Version:
XRechnung 1.0+

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:InvoiceLine/cac:Item/cac:ClassifiedTaxCategory/cbc:TaxAmount
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementLineMonetarySummation/ram:ApplicableTradeTax/ram:CalculatedAmount
```

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
VAT amount calculated for the line item.

### Legal Requirement
Mandatory for each invoice line according to EN 16931-1.

## 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)