Introduction to DSFINVK DE

What is DSFinV-K?

📘Naming

fiskaly’s API is named DSFINVK DE. DSFinV-K is the official German government abbreviation for the standard.

DSFinV-K (Digitale Schnittstelle der Finanzverwaltung fur Kassensysteme) is the German standard for fiscal data exports from POS systems. It defines the structure and format of data that must be available to tax auditors on demand.

In practical terms: DSFinV-K is how your POS system packages its transaction data into an auditor-friendly export format.

⚠️Required for Germany

DSFinV-K is not optional if you operate POS systems in Germany. Tax auditors can request DSFinV-K exports at any time, and you are legally obligated to provide them.

Do you need DSFINVK DE?

Scenario	Do you need DSFINVK DE?
You operate POS systems in Germany	Yes — legally required
You operate in Austria, France, Italy, Spain, or Sweden	No — DSFINVK DE is Germany-specific
You already use SIGN DE	Yes — DSFINVK DE complements SIGN DE. SIGN signs the transactions; DSFINVK DE exports them.

How it relates to SIGN DE

SIGN DE and DSFINVK DE are two separate products that work together for full German compliance:

Transaction happens at POS
  |
  +--> SIGN DE signs the transaction (cryptographic signature)
  |
  +--> DSFINVK DE records the transaction in a cash point closing
  |
  +--> At end of day: cash point closing is finalized
  |
  +--> On demand: DSFINVK DE export is generated for the auditor

SIGN DE handles the real-time signing obligation. DSFINVK DE handles the reporting and export obligation. You need both.

How it works

The fiskaly DSFINVK DE API is a RESTful API that:

1. Receives cash point closing data — you submit structured transaction data at the end of each business day
2. Stores it in the correct DSFinV-K format
3. Generates exports on demand — compliant with the official BZSt specification
4. Makes exports available for download via API

The naming convention follows the DFKA Taxonomy.

Integration effort

Scenario	Duration	Notes
Already on SIGN DE	2-4 weeks	Map your POS data model to DSFINVK DE taxonomy, implement cash point closings
New (SIGN DE + DSFINVK DE together)	Included in the 8-13 week Germany estimate	See Integration Planning

The main engineering work is mapping your POS data model to the DSFINVK DE taxonomy. This includes defining process types, business transaction types, VAT definitions, and structuring your end-of-day closing data.

Key resources

Key Characteristics

Structure of cash point closings and export format

Endpoints

API endpoints for closings, exports, and VAT definitions

Connecting SIGN DE

How to link your SIGN DE TSS with DSFINVK DE

Process & Transaction Types

Mapping your POS operations to DSFinV-K categories

Troubleshooting

Common issues and how to resolve them

Exports

Generating and downloading audit-ready export files

External resources

• BZSt official DSFINVK DE documentation (German Federal Central Tax Office)
• Federal Ministry of Finance FAQ (legal requirements for POS vendors)
• DFKA Taxonomy (naming conventions used in the API)
• DSFINVK DE API Reference (full OpenAPI specification)
• Postman Quick Start (interactive exploration)

FAQ

Help Center articles are available at support.fiskaly.com.