What Does GoBD Mean and Who Must Operate in Compliance with GoBD?

A tax audit in the automotive trade costs several days of working time on average – and for roughly one business in four it ends with estimated add-backs because the bookkeeping does not comply with the GoBD. For repair shops and car dealerships that is more than a bureaucratic annoyance: it is about back taxes, interest and, in the worst case, the rejection of the entire cash-management system. Any automotive business that wants to work in a permanently GoBD-compliant way with CATAMA software benefits from a digital solution that covers every requirement of the German Federal Ministry of Finance – from capturing documents through to audit-proof archiving.

Key takeaways

• GoBD stands for the German „Principles for the proper management and retention of books, records and documents in electronic form and for data access“.
• Every automotive business required to keep accounts – from the sole trader to the dealership group with several branches – must work in a GoBD-compliant way.
• The core principles are traceability, completeness, accuracy, timely posting, order and immutability.
• Breaches lead to estimated add-backs, fines and rejection of the bookkeeping by the tax office.
• With GoBD-compliant industry software such as CATAMA, all obligations can be met automatically and in an audit-proof manner.

What does GoBD mean in concrete terms?

The GoBD were first published by the German Federal Ministry of Finance (BMF) in 2014 and were last revised substantially in its letter of 28 November 2019. They replace the earlier GoBS and GDPdU rules and consolidate all requirements for proper digital bookkeeping into a single set of regulations.

At their core, the GoBD describe how companies must capture, process and store tax-relevant data electronically and make it available to the tax office. They apply regardless of whether a business does its own bookkeeping, engages a tax adviser or works with a cloud solution.

The ten basic GoBD principles at a glance

“Bookkeeping is only proper if a knowledgeable third party can gain an overview of the business transactions and the situation of the company within a reasonable period of time.” – BMF letter on the GoBD

What does “immutability” mean in practice?

For repair shops this point is particularly sensitive. Once an invoice has been issued, it may not be “corrected” afterwards in Excel. Instead, if something is wrong, a credit note or cancellation invoice must be created that replaces the original document – in such a way that the original invoice remains findable in the system.

Who has to work in a GoBD-compliant way?

The GoBD apply to all taxpayers who are required to keep accounts or records under commercial or tax law. In the automotive sector that covers practically every business, with a few exceptions for very small traders.

Affected businesses in the automotive sector

• Car repair shops of every size – from the one-person workshop to the franchised dealership workshop with 50 employees
• Car dealerships and vehicle traders (new and used cars)
• Tyre retailers and tyre fitting businesses
• Paint and body shops
• Towing and car rental companies
• Independent workshops and tuning businesses
• Spare parts dealers in both B2B and B2C

Small businesses under section 19 of the German VAT Act (UStG) are not automatically exempt from the GoBD either. As soon as a business keeps books – for example because it is registered in the commercial register as a merchant – the obligations apply in full.

Cash-basis accounting (EÜR)

Automotive businesses that determine their profit using cash-basis accounting must also observe the GoBD. Although they are subject to less strict record-keeping duties than companies preparing balance sheets, the requirements for capturing documents, cash management and data security are identical.

The special case of cash management

Anyone taking cash in the workshop or dealership – for minor repairs, tyre changes or deposits – is additionally subject to the German Cash Register Security Ordinance (KassenSichV). Since 2020, electronic point-of-sale systems must have a certified technical security device (TSE). An optimised cash book for the automotive sector meets these requirements automatically and protects against rejection during a cash inspection.

Working in a GoBD-compliant way with CATAMA software: how it works in practice

The theoretical requirements are one thing – implementing them in day-to-day workshop life is another. An automotive business that wants to work in a GoBD-compliant way with CATAMA software benefits from the fact that every relevant function is integrated in an industry-specific and audit-proof manner. Below we show which building blocks contribute to GoBD compliance in concrete terms.

1. Audit-proof document capture and archiving

Every incoming and outgoing document is captured in CATAMA with a time stamp and user ID. A structured document capture with archive function ensures that supplier invoices, fuel receipts or workshop jobs are stored digitally, searchably and immutably. That replaces the classic shuttle folder and makes the ten-year retention period considerably more relaxed.

2. Complete job and invoice documentation

From the quotation through the workshop job to the final invoice, CATAMA documents every step. With the automotive invoicing program including e-invoicing and a DATEV interface, documents can be handed over directly to the tax adviser – with no change of medium and no manual transfer errors.

Mandatory details on every invoice under section 14 UStG:

• Full name and address of the supplying business and the recipient
• Tax number or VAT identification number
• Date of issue and sequential invoice number
• Quantity and type of goods supplied or scope of the service
• Date of the supply or service
• Consideration broken down by tax rate
• Applicable tax rate and tax amount

CATAMA ensures these mandatory details automatically and warns you if a field is missing.

3. Immutability through an audit trail

As soon as an invoice has been printed or sent by email, it is locked in CATAMA. Changes are then only possible via an audit-proof credit note or cancellation invoice. Every action is logged in the audit trail – including user, time and type of change.

4. Complete inventory management and stock valuation

For vehicle traders and workshops with a larger parts store, valuing stock correctly is relevant for tax purposes. The automotive inventory management with warehouse administration records every goods receipt and issue, values the stock using FIFO or the average method and produces an inventory-ready stock list at any time.

5. Timely posting thanks to a cloud architecture

Because CATAMA runs as a cloud solution, workshop managers, sales staff and accountants can work in the system at the same time. A cash payment at the workshop counter is recorded immediately – which automatically satisfies the requirement for daily cash posting. You can read more about the advantages in the article on efficient cloud workshop software.

6. Machine readability and DATEV export

During an external audit, the tax office requires machine-readable data in accordance with the principles of data access (Z1, Z2, Z3). CATAMA exports all tax-relevant transactions in the standardised DATEV format – including general ledger accounts, tax keys and document links.

7. Process documentation as an integral part

A frequently overlooked GoBD point is process documentation. It describes which software is used and how, who holds which rights and how documents move through the system. CATAMA provides templates and automated logs that cover the bulk of this documentation.

What happens if you breach the GoBD?

Many workshop owners underestimate the consequences. If the tax office identifies formal or material defects, the following measures may follow.

Formal defects

These include missing process documentation, gaps in document numbering or software that is not audit-proof. Consequence: a warning, a fine of up to €5,000 and an order to remedy the defects.

Material defects

Here the accounting results themselves are affected – for example because cash receipts were not recorded in full or documents are missing. Consequences:

1. Rejection of the bookkeeping as a whole
2. Estimated add-backs to revenue (often a surcharge of 10 to 20 per cent)
3. Back payment of VAT, income tax and trade tax
4. Interest at 6 per cent per year (statutory rate)
5. In cases of intent: criminal tax proceedings

An example: a workshop with annual revenue of €400,000 whose cash management is rejected can quickly face €20,000 in back taxes plus interest if a 15 per cent add-back is applied.

Cash inspections

Since 2018, tax officials have been allowed to turn up at a workshop or dealership without prior notice and inspect the till. Anyone unable to produce GoBD-compliant documentation on the spot risks an immediate external audit.

Practical checklist: is your automotive business GoBD-compliant?

Check your business against the following questions. If you answer more than two with “no”, you should act urgently.

• Are all invoices issued with a sequential number without gaps?
• Can you find any till receipt from the past 10 years within seconds?
• Is your till equipped with a certified TSE?
• Are cash receipts posted daily?
• Does written process documentation exist?
• Are issued invoices technically immutable?
• Can you provide the tax office with machine-readable data (DATEV, IDEA)?
• Is your accounting data protected against loss and unauthorised access?
• Are incoming invoices archived digitally and indexed?
• Is there clear rights management in your software?

Working in a GoBD-compliant way with CATAMA software: the benefits for automotive businesses

Investing 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 focus: whereas standard programs such as Excel or simple invoicing tools only cover basic functions, CATAMA is tailored precisely to car repair shops and vehicle trading. From tyre management to workshop management, every function is proven in practice.

Cloud security: data is stored in German data centres, mirrored several times and transmitted in encrypted form. You will find the details in the information on our data centre and data security.

Automated processes: everything from the quotation to the DATEV handover runs in a single system. That reduces sources of error and saves working time. The detailed guide on how CATAMA digitalises every business process in the automotive trade shows how.

Scalability: whether you are a one-person workshop or run several branches – CATAMA grows with you. Editions such as Smart Edition, Professional and Enterprise cover every size of business.

Interfaces: numerous interfaces to suppliers and e-commerce systems allow incoming invoices to be imported electronically – another plus for GoBD-compliant document capture.

Common mistakes and how to avoid them

Mistake 1: “shadow bookkeeping” in Excel

Many workshops keep Excel lists for tips, deposits or special cases alongside their main software. That breaches completeness and immutability – Excel files can be manipulated at will.

Mistake 2: capturing documents only at the end of the month

For cash receipts the GoBD require daily posting. Anyone who collects receipts for weeks and then types them in all at once risks having the till records rejected.

Mistake 3: no process documentation

Even with perfect software, bookkeeping is formally defective if there is no written description of the processes. It must be updated and archived whenever something changes.

Mistake 4: missing backups

A hard-disk crash with data loss counts as a serious breach. Cloud solutions such as CATAMA back up automatically and repeatedly – but local exports should be created regularly as well.

Mistake 5: outdated POS software

Anyone still working with a till without a TSE has been in breach of the Cash Register Security Ordinance since 2020. Even though the GoBD themselves do not prescribe a TSE, the breach leads to rejection.

Transition periods and current developments in 2026

Under the German Growth Opportunities Act, the e-invoicing obligation in B2B has been in force since 1 January 2025. Since then, automotive businesses must be able to receive electronic invoices in XRechnung or ZUGFeRD format. Transition periods for sending them still apply until the end of 2026; from 2027 electronic invoicing will become mandatory step by step.

CATAMA already fully supports e-invoicing via the integrated automotive invoicing program – an important building block for remaining GoBD-compliant in the years ahead.

Conclusion: next steps towards GoBD-compliant working

The GoBD are not an optional set of rules but a binding obligation for every automotive business in Germany that is required to keep accounts. Anyone ignoring the requirements risks estimated add-backs, fines and, in extreme cases, criminal tax proceedings. The good news: with an industry-specific, GoBD-compliant software solution, all obligations can largely be met automatically.

Concrete next steps for your business:

1. Take stock: work through the checklist above and identify your weak points.
2. Create process documentation: describe in writing which software you use and how.
3. Review your software: does your current solution meet the requirements for immutability, data security and machine readability?
4. Train your staff: everyone who captures documents needs to know the GoBD principles.
5. Get to know CATAMA: start a free trial of the cloud workshop software and see the GoBD compliance for yourself.
6. Involve your tax adviser: optimise the DATEV interface and document handover together.

Investing in a professional, GoBD-compliant industry solution today not only protects you against tax risks – it also gains you time, clarity and a competitive edge. If you have questions about implementation, the CATAMA team is available at any time via the contact and support page.