# BT-121 Total prepayment amount

The total amount of prepayments received from the buyer. This is the same as BT-113.

## Quick answer

The total amount of prepayments received from the buyer. This is the same as BT-113.

> **Taxes and totals**: VAT treatment, tax breakdowns, and document totals that validators check closely.

## In plain language

The total amount of prepayments received from the buyer. This is the same as BT-113.

The total amount of prepayments received from the buyer. This is the same as BT-113.

Used when prepayments have been made before invoicing.

## What you usually enter here

Decimal number with up to 2 decimal places, non-negative

Typical valid values include: 500.00, 0.00, 1000.00

Optional according to EN 16931-1. Same as BT-113.

## What goes wrong often

Avoid values like: -500.00, 500,00, 5.00.00

Relevant rule codes: BR-2

## Examples in context

Used when prepayments have been made before invoicing.

Optional according to EN 16931-1. Same as BT-113.

## Valid Examples

- 500.00
- 0.00
- 1000.00

## Invalid Examples

- -500.00
- 500,00
- 5.00.00

## Related Fields

Used when prepayments have been made before invoicing.

- [BT-113 Paid Amount](/resources/xrechnung/bt-113-paid-amount)
- [BT-115 Amount Due for Payment](/resources/xrechnung/bt-115-amount-due-for-payment)

## 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-121

### Data Type:
amount

### Cardinality:
0..1

### Requirement:
Optional

### Since Version:
Optional

## XML Implementation

### UBL 2.1 Syntax
```
/Invoice/cac:LegalMonetaryTotal/cbc:PrepaidAmount
```

### CII (UN/CEFACT) Syntax
```
/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeSettlement/ram:SpecifiedTradeSettlementHeaderMonetarySummation/ram:TotalPrepaidAmount
```

## Validation Rules

### BR-2
BR-2

## Why the standard cares about this field

### Business Context
Used when prepayments have been made before invoicing.

### Legal Requirement
Optional according to EN 16931-1. Same as BT-113.

## 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)