What does GoBD mean, and who is required to comply with GoBD when using CATAMA software?

A tax audit in the automotive trade takes several days of work on average—and for about one in four businesses, it results in additional tax assessments because their bookkeeping does not comply with GoBD. For repair shops and car dealerships, this is more than just a bureaucratic nuisance: it involves back taxes, interest, and, in the worst case, the rejection of their entire cash management system. Any automotive business that wants to operate in a consistently GoBD-compliant manner using CATAMA Software benefits from a digital solution that meets all the requirements of the Federal Ministry of Finance—from document entry to audit-proof archiving.

Key Takeaways

• GoBD stands for “Principles for the Proper Maintenance and Retention of Books, Records, and Documents in Electronic Form, as well as for Data Access.”
• Every automotive business required to maintain accounting records —from sole proprietorships to car dealerships with multiple locations—must operate in compliance with GoBD.
• The core principles are traceability, completeness, accuracy, timely recording, order, and immutability.
• Violations result in additional assessments, fines, and the tax office rejecting the financial records.
• With GoBD-certified industry software such as CATAMA, all requirements can be met automatically and in an audit-proof manner.

What exactly does GoBD mean?

The GoBD were first published by the Federal Ministry of Finance (BMF) in 2014 and were most recently comprehensively revised in a letter dated November 28, 2019. They replace the earlier GoBS and GDPdU and consolidate all requirements for proper digital accounting into a single set of rules.

Essentially, the GoBD guidelines describe how companies must electronically record, process, and store their tax-related data and make it available to the tax authorities. These guidelines apply regardless of whether a business handles its own bookkeeping, hires a tax advisor, or uses a cloud-based solution.

An Overview of the Ten Basic Principles of GoBD

“Accounting records are considered proper only if a knowledgeable third party can, within a reasonable amount of time, gain an overview of the business transactions and the company’s financial position.” – BMF Letter on GoBD

What does “immutability” mean in practice?

This is a particularly sensitive issue for auto repair shops. Once an invoice has been created, it cannot be “corrected” retroactively in Excel. Instead, if there are errors, a credit memo or cancellation invoice must be generated to replace the original document—and this must be done in such a way that the original invoice remains traceable in the system.

Who is required to comply with GoBD?

The GoBD apply to all taxpayers who are required to maintain accounting records or keep records under commercial or tax law. In the automotive industry, this applies to virtually every business—with a few exceptions for micro-entrepreneurs.

Affected businesses in the automotive industry

• Auto repair shops of all sizes—from one-person shops to brand-authorized repair shops with 50 employees
• Car dealerships and auto dealers (new and used cars)
• Tire dealers and tire installation shops
• Paint and Body Shops
• Towing and Car Rental Companies
• Independent Auto Repair Shops and Tuning Shops
• Spare parts dealers in the B2B and B2C sectors

Even small business owners under Section 19 of the German Value-Added Tax Act (UStG) are not automatically exempt from the GoBD requirements. As soon as a business keeps books—for example, because it is registered as a merchant in the commercial register—the obligations apply in full.

Income-Surplus Calculator (EÜR)

Even auto repair shops that calculate their profits using the simplified income statement method (EÜR) must comply with the GoBD. Although their record-keeping requirements are less stringent than those for companies that prepare balance sheets, the requirements for document recording, cash management, and data security are identical.

Special Feature: Cash Management

Anyone who accepts cash at a repair shop or car dealership—for example, for minor repairs, tire changes, or down payments—is also subject to the Cash Register Security Regulation (KassenSichV). Since 2020, electronic cash register systems must be equipped with a certified technical security device (TSE). An optimized cash book designed for the automotive industry automatically meets these requirements and protects against discrepancies during cash register audits.

Working in Compliance with GoBD Using CATAMA Software: How It Works in Practice

Theoretical requirements are one thing—putting them into practice in day-to-day workshop operations is another. Automotive repair shops that want to operate in compliance with GoBD using CATAMA software benefit from the fact that all relevant functions are integrated in an industry-specific and audit-proof manner. Below, we outline the specific components that contribute to GoBD compliance.

1. Audit-compliant document capture and archiving

Every incoming and outgoing document is recorded in CATAMA with a timestamp and user ID. A structured document capture system with an archiving function ensures that supplier invoices, gas station receipts, and repair shop orders are stored digitally, in a searchable format, and in a way that prevents tampering. This replaces the traditional ring binder and makes complying with the 10-year retention period much easier.

2. Complete order and invoice documentation

From the estimate to the repair order to the final invoice, CATAMA documents every step. With the automotive invoicing program—which includes e-invoicing and a DATEV interface —documents can be sent directly to your tax advisor—without any media breaks or manual data entry errors.

Required information on every invoice pursuant to Section 14 of the German Value-Added Tax Act (UStG):

• Full name and address of the service provider and the service recipient
• Tax ID Number or VAT ID Number
• Date of issuance and sequential invoice number
• Quantity and type of items delivered or scope of services provided
• Date of Delivery or Performance
• Compensation Broken Down by Tax Rate
• Applicable Tax Rate and Tax Amount

CATAMA automatically ensures that these required fields are filled out and alerts you if a field is missing.

3. Immutability Through an Audit Trail

Once an invoice has been printed or sent by email, it is finalized in CATAMA. Changes can only be made via an audit-compliant credit memo or cancellation invoice. Every action is logged in the audit trail—including the user, the time, and the type of change.

4. Comprehensive inventory management and inventory valuation

For auto dealers and repair shops with large spare parts inventories, the correct valuation of inventory is relevant for tax purposes. The automotive inventory management system with warehouse management tracks every incoming and outgoing shipment, values the inventory using the FIFO or average cost method, and generates an inventory list ready for a physical count at any time.

5. Timely Posting Thanks to Cloud Architecture

Because CATAMA runs as a cloud-based solution, shop managers, salespeople, and accountants can all work on the system at the same time. A cash payment made at the shop counter is recorded immediately—thus automatically fulfilling the requirement for daily cash register entries. Read more about the benefits in the article on efficient cloud-based shop management software.

6. Machine-Readable Format and DATEV Export

During an on-site audit, the tax office requires machine-readable data in accordance with the data access principles (Z1, Z2, Z3). CATAMA exports all tax-related transactions in the standardized DATEV format—including general ledger accounts, tax codes, and document links.

7. Process documentation as an integral part

One aspect of GoBD that is often overlooked is procedural documentation. It describes which software is used and how, who has which permissions, and how documents flow through the system. CATAMA provides templates and automated logs that cover the majority of this documentation.

What happens if the GoBD guidelines are violated?

Many garage owners underestimate the consequences. If the tax office identifies formal or substantive deficiencies, the following measures may be taken:

Formal Defects

These include a lack of procedural documentation, incomplete document numbering, or software that is not audit-proof. Consequences: a warning, a fine of up to 5,000 euros, and a requirement to correct the deficiencies.

Material Defects

In this case, the accounting results themselves are affected—for example, because cash receipts were not fully recorded or because supporting documents are missing. Consequences:

1. Rejection of the Financial Statements as a Whole
2. Estimation of sales (often a 10 to 20 percent markup)
3. Back Payments of Sales Tax, Income Tax, and Business Tax
4. Interest at a rate of 6 percent per year (as required by law)
5. In cases of intent: criminal tax proceedings

Here’s an example: A repair shop with an annual revenue of 400,000 euros whose cash records are rejected could quickly face a 15 percent additional assessment, resulting in 20,000 euros in back taxes plus interest.

Cash Register Audit

Since 2018, tax officials have been authorized to visit repair shops or car dealerships without prior notice and inspect their cash registers. Anyone who cannot immediately produce GoBD-compliant documentation risks an on-site audit.

Practical Checklist: Is Your Auto Repair Shop GoBD-Compliant?

Assess your business using the following questions. Anyone who answers “No” to more than two of them should take immediate action.

• Are all invoices issued with a continuous, sequential number?
• Can you find every receipt from the last 10 years in a matter of seconds?
• Is your cash register equipped with a certified TSE?
• Are cash receipts recorded daily?
• Is there written documentation of the procedure?
• Are issued invoices technically unalterable?
• Can you provide the tax office with machine-readable data (DATEV, IDEA)?
• Is your accounting data protected against loss and unauthorized access?
• Are incoming invoices digitally archived and tagged?
• Does your software have a clear rights management system?

Working in Compliance with GoBD Using CATAMA Software: Benefits for Auto Repair Shops

The investment in a GoBD-certified industry solution usually pays for itself within a few months. The following advantages set CATAMA apart from generic office software:

Industry-Specific: While standard programs like Excel or simple invoicing tools only cover basic functions, CATAMA is tailored specifically to automotive repair shops and dealerships. From tire management to shop management, every feature has been tested in real-world use.

Cloud Security: Data is stored in German data centers, mirrored multiple times, and transmitted in encrypted form. For more details, see the information on data centers and data security.

Automated Processes: From cost estimates to DATEV data transfer, everything runs in a single system. This reduces the potential for errors and saves time. This detailed guide shows how CATAMA digitizes all business processes in the automotive industry.

Scalability: Whether you're a one-person workshop or have multiple locations, CATAMA grows with you. Different editions—such as Smart Edition, Professional, and Enterprise —cover businesses of all sizes.

Interfaces: Thanks to numerous interfaces with suppliers and e-commerce systems, incoming invoices can be imported electronically—another advantage for GoBD-compliant document capture.

Common Mistakes and How to Avoid Them

Mistake 1: “Shadow Accounting” in Excel

Many workshops maintain Excel spreadsheets for tips, down payments, or special cases alongside their main software. This violates the principles of completeness and immutability —Excel files can be manipulated at will.

Mistake 2: Entering receipts only at the end of the month

The GoBD requires daily entries for cash receipts. Anyone who collects receipts for weeks and then enters them all at once risks having their cash register records rejected.

Mistake 3: Lack of procedural documentation

Even with perfect software, the accounting system is formally deficient if there is no written description of the processes. This description must be updated and archived whenever a change is made.

Mistake 4: Lack of Backups

A hard drive crash resulting in data loss is considered a serious violation. Cloud solutions such as CATAMA automatically perform multiple backups—but local backups should also be created regularly.

Mistake 5: Outdated POS Software

Anyone still using a cash register without a TSE has been in violation of the Cash Register Security Regulation since 2020. Even though the GoBD itself does not require a TSE, such a violation results in the records being rejected.

Transition Periods and Current Developments in 2026

Under the Growth Opportunities Act, the requirement for electronic invoicing in the B2B sector has been in effect since January 1, 2025. Since then, automotive businesses must be able to receive electronic invoices in the XRechnung or ZUGFeRD formats. Transitional periods for sending invoices will remain in effect until the end of 2026; starting in 2027, electronic invoicing will gradually become mandatory.

CATAMA already fully supports e-invoicing through its integrated automotive invoicing program —an important step toward remaining GoBD-compliant in the years to come.

Conclusion: Next Steps for GoBD-Compliant Work

The GoBD is not an optional set of rules, but a mandatory requirement for every automotive business in Germany that is subject to accounting regulations. Anyone who ignores these requirements risks tax assessments, fines, and, in extreme cases, criminal tax proceedings. The good news is that with an industry-specific, GoBD-compliant software solution, all obligations can be fulfilled largely automatically.

Specific next steps for your business:

1. Conduct an assessment: Work through the checklist above and identify vulnerabilities.
2. Create procedural documentation: Describe in writing which software you use and how you use it.
3. Evaluate Your Software: Does Your Current Solution Meet the Requirements for Immutability, Data Security, and Machine-Readability?
4. Training Employees: Everyone who enters receipts must be familiar with the GoBD principles.
5. Get to know CATAMA: Start a free trial of the cloud-based workshop software and see for yourself that it complies with GoBD.
6. Involve your tax advisor: Work together to optimize the DATEV interface and document transfer.

Investing in a professional, GoBD-compliant industry solution today not only protects you from tax risks—it also saves you time, gives you a clear overview, and provides competitive advantages. If you have any questions about implementation, the CATAMA team is available to assist you at any time via the Contact and Support page.