DATEV API: Unternehmen Online vs. Rechnungswesen for SaaS Providers

DATEV Unternehmen online (DUo): Features and Use Cases

What Is DATEV Unternehmen online?

DATEV Unternehmen online is a cloud-based platform acting as the central hub for collaboration between businesses and tax advisors. It’s specifically designed to streamline the exchange of documents and data. It is not a typical accounting software (e.g. Xero or Lexware), DUo doesn’t function as a full-fledged accounting system. Instead, it focuses solely on data exchange and collaboration.

For small businesses—especially those outsourcing their bookkeeping to tax advisors — DATEV Unternehmen online serves as a digital bridge, allowing both parties to access the same up-to-date documents stored securely in the cloud.

Core Features of DATEV Unternehmen online

Document and Receipt Management: DATEV Unternehmen Online allows businesses to upload receipts, invoices, and other documents as PDF, JPG, TIFF and e-invoice. These documents can then be accessed by tax advisors, eliminating the need for physical handovers.

Typical Users of DATEV Unternehmen online

• Small Businesses: Companies that don’t handle their own bookkeeping but rely on tax advisors for accounting often use DUo to digitize and share receipts.
• Tax Advisors: DUO is a crucial tool for tax advisors who manage bookkeeping for multiple clients, enabling them to work efficiently and access client data in real time.

Integration with DATEV Unternehmen online

Since DUO doesn’t perform accounting functions, many businesses use it alongside accounting software with bookkeeping purposes. To simplify workflows, these systems often integrate with DUo to transfer pre-processed data (e.g., receipts, invoices, and structured data) directly into the DATEV ecosystem.

However, accessing DUo’s integration capabilities isn’t straightforward. Companies must activate and subscribe to additional services through their tax advisors. The two most relevant services for integration are:

1. Belegbilderservice

Enables the upload of digital receipts and documents via API.

2. Rechnungsdatenservice 1.0:

Transfers via XML- Upload structured data and receipts into DATEV Unternehmen online for further processing by tax advisors in the Kanzlei-Rechnungswesen (the tax advisor DATEV) system.

In concrete this means:

• Verkaufsrechnungen– und gutschriften
• Einkaufsrechnungen– und gutschriften
• Kassentransaktionen.

DATEV Rechnungswesen (ReWe): Features and Use Cases

What Is DATEV Rechnungswesen?

Unlike DUo, ReWe is an on-premise accounting solution designed for businesses that handle their bookkeeping in-house. It’s commonly used by medium-sized and larger companies that require robust accounting capabilities.

Rechnungswesen supports everything from financial accounting to cost accounting and asset management, making it a comprehensive solution for businesses managing their own finances.

Core Features of DATEV Rechnungswesen

1. Journal Entries and Bookkeeping

ReWe enables businesses to create, manage, and analyze journal entries.

2. Advanced Reporting

Users can generate detailed financial reports, cost analyses, and balance sheets.

Typical Users of DATEV Rechnungswesen

• Medium-Sized and Large Companies:
• Businesses that perform their own accounting tasks often use ReWe for its comprehensive features.
• Industries with Complex Financial Needs:
• Companies requiring advanced accounting functions, like cost center allocation and asset tracking, benefit from ReWe.

Data Integration with Rechnungswesen

There are two primary ways to send data to Rechnungswesen:

1. Via DATEV Unternehmen online as structured data (e.g., draft journal entries) which can be provided to DATEV Rechnungswesen through a manual trigger
2. Using the DATEV-Datenservice Rechnungswesen, which is directly sent to the DATEV data center in CSV format.

Challenges for SaaS Companies Integrating with DATEV

For SaaS companies looking to integrate with DATEV , the fragmented ecosystem can pose significant challenges:

• Limited API Access: Getting the permission sending data to DATEV requires going through a multi-step process with DATEV consultants.

• Complex Data Formats: DATEV’s reliance on XML or CSV formats and specific workflows with authentication queries adds an extra layer of complexity for developers.

• Inconsistent Workflows: The workflows between DUO and ReWe differ significantly, requiring SaaS providers to tailor their integrations to each system.

How Maesn Simplifies DATEV API Integration

At Maesn, we understand these challenges and provide a solution tailored for SaaS companies. We have built a layer on the DATEV XML and CSV APIs and simplified workflows with authentication and permission queries and brought it all on our unified API. This enable you to bridge the gap between various ERP and accounting systems—including DATEV—so you don’t have to worry about the complexities of individual integrations.

Key Benefits of Maesn’s Unified API for DATEV Integration:

1. Simplification: Forget about wrestling with XML and CSV. Maesn’s API uses JSON data format, simplifying development for SaaS providers.
2. Both DUO and ReWe: Whether your customers rely on DUo for document sharing or ReWe for advanced accounting, Maesn’s API ensures seamless data transfer across the DATEV ecosystem.
3. Cost and Time Savings: Getting the permission to integrate to DATEV is not a quick win: It takes time to understand the DATEV landscape, requires an initial invest and a multi-step validation process. Or: Just use the Maesn API and get your app DATEV certified via our simplified approval process..

Why SaaS Companies Should Care

If your SaaS platform caters to businesses operating in Germany, integrating with DATEV is in most cases a necessity. But instead of juggling multiple APIs, subscriptions, and workflows, you can leverage Maesn’s unified API to deliver a seamless experience to your customers.

With Maesn, SaaS not only speed up development but also provide a competitive edge by offering robust DATEV integrations—something your customers will thank you for.

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Wrapping It Up

Navigating DATEV’s ecosystem can be daunting, but with the right tools, it doesn’t have to be. Whether you’re dealing with DUo for document sharing or ReWe for in-house accounting, understanding their features and workflows is key to building successful integrations.

With Maesn’s unified API, SaaS providers can overcome the complexity of DATEV integrations and focus on what really matters—delivering value to their customers.

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