In the hectic day-to-day operations of a modern auto repair shop, processes must run smoothly. Between advising customers, diagnosing problems, and performing repairs, there is often little time left for administrative details. But when it comes to invoicing for replacement parts (used parts), there is a significant tax hurdle lurking: the used-parts tax.
Many repair shops are unsure about the exact regulations. However, incorrect billing can not only lead to disputes with customers but, in the worst case, result in costly additional tax assessments from the tax authorities following a tax audit.
In this comprehensive guide, we explain everything you need to know: exactly what the used parts tax is, why it exists, how it is calculated correctly, and how you can manage the entire process with the CATAMA workshop software .
What exactly is the used parts tax?
First things first: The “used-car tax” is not a separate tax, but rather a specific application of the Value-Added Tax Act (Section 10 UStG). It governs the taxation of so-called trade-in transactions involving a cash payment, which are commonplace in the automotive industry.
Specifically, this applies whenever a customer trades in a defective but reusable part (the old part) in exchange for a new or fully refurbished replacement part (the replacement part).
Typical examples of this include:
- Alternators
- Starter motor
- Brake calipers
- Transmissions and Clutches
- Steering gear
The tax trick is that the value of the returned used part (often referred to as a trade-in ) is considered part of the payment for the new part. Sales tax must therefore be allocated to two separate tax bases, which must be clearly shown on the invoice.
Sample calculation: How the tax on old shares is calculated in practice
Manual calculations are where most mistakes occur. Let’s walk through this with a concrete example. A faulty alternator is being replaced.
- Price of the new replacement alternator: €350.00 (excluding tax)
- Refund (trade-in value) for the old alternator: €100.00 (net)
The correct calculation:
-
Basis for calculating the repair cost (customer's copayment):
- €350.00 (price of replacement part) – €100.00 (value of old part) = €250.00
- Plus 19% VAT: €250.00 × 0.19 = €47.50
-
Basis for calculating the trade-in (value of the old item):
- Value of the old part = €100.00
- Plus 19% VAT (the "used parts tax"): €100.00 × 0.19 = €19.00
Note: Common mistake— it is incorrect to simply subtract the deposit amount from the net price and tax only the remaining balance. Sales tax must be applied to the full value of the replacement part (€350), but it is simply split. In our example, the total sales tax amounts to €47.50 + €19.00 = €66.50, which corresponds exactly to 19% of €350.00.
Correct invoice formatting:
| Position | Quantity | Single (net) | Total (net) |
|---|---|---|---|
| Replacement alternator | 1 | 350,00 € | 350,00 € |
| Refund for the used part (deposit) | 1 | -100,00 € | -100,00 € |
| Net total | 250,00 € | ||
| plus 19% VAT | 47,50 € | ||
| plus 19% sales tax on the value of the used part (€100.00) | 19,00 € | ||
| Invoice amount (gross) | 316,50 € |
This manual process is not only cumbersome, but also an unnecessary source of errors in day-to-day operations.
The solution: Invoices with tax on used parts—automated and GoBD-compliant with CATAMA
The complexity of the used parts tax is one of the reasons why we designed CATAMA to meet the specific needs of modern auto repair shops. Our software completely takes the burden of accurate billing off your hands.
With CATAMA, manual calculations and worries about errors are a thing of the past.
- Easy to use: Simply mark an item as a replacement part and enter the deposit amount. The software takes care of the rest.
- Fully automated calculation: CATAMA automatically determines the correct tax bases and the applicable sales tax in the background—in a matter of seconds.
- A professional image: A clear, accurate, and easy-to-understand invoice builds trust with your customers and highlights the professionalism of your business.
- More time for what matters: Save valuable time that you would otherwise have to spend on tedious invoice verification. Focus your full attention back on your customers and your shop.
Frequently Asked Questions About the Scrap Tax
What happens if the customer doesn't return the used item, or returns it too late? In that case, the deposit amount previously credited becomes void. You must bill the customer for the deposit amount. With CATAMA, you can easily create a separate invoice for this purpose.
Does this rule also apply to individual customers? Yes, the rule regarding the tax on used parts applies to all customers, whether they are businesses (B2B) or individuals (B2C).
Do I really have to report the tax on used parts in such a complicated way? Yes, separate reporting is required by law to ensure that the calculation is transparent to the tax authorities. Simplifying the process is not permitted.
Bottom line: Put an end to billing stress
The used parts tax may seem complicated at first glance, but with the right digital tool, it becomes a simple, standard process. Instead of getting bogged down in tax details and taking risks, you can rely on software that takes the burden off your shoulders.
Want to see how easy billing is with CATAMA? Request your free, personalized online demo today and discover how you can save time, avoid errors, and optimize your workshop processes for the long term.
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