Index
Why a used car dealer's accounting is different from other businesses'
What accounting software built for used car dealers must cover
General-purpose accounting programs: what they can and can't do
The alternative: a DMS with built-in per-vehicle accounting
What to look at before choosing accounting software
Dealcar and accounting built into dealership management
Frequently asked questions
Why a used car dealer's accounting is different from other businesses'
A service business or a standard retailer sells the same product or service at similar prices over and over. Its accounting is relatively uniform: service income, operating expenses, output VAT at 21%.
A used car dealership has a different set of circumstances in every deal. The purchase price varies for each vehicle, preparation costs differ for each car, the tax scheme can be REBU or standard VAT depending on where the car was bought, and the real margin is only calculated correctly when all of each vehicle's direct costs are added up. Accounting has to work at the file level, not at the level of a generic invoice line.
That means an accounting program designed for generic businesses doesn't have the structure a used car dealer needs. It can issue invoices and keep the general accounts, but it doesn't handle REBU natively, doesn't calculate the margin per vehicle automatically and doesn't generate the mandatory REBU register.
What accounting software built for used car dealers must cover
Software with accounting adapted for used car dealers has to handle four functions in an integrated way.
The first is correct REBU invoicing: issuing invoices without itemised VAT and with the legal reference to the special scheme, in accordance with article 138 of the VAT Regulation, and generating the certified Verifactu record at the time of issue.
Read what the REBU registry book must include and how to organise it.
The second is the automatic calculation of the margin per vehicle: linking the purchase price, the car's direct expenses (transport, workshop, administrative services) and the sale price in a per-vehicle file, so that the net margin is calculated automatically when each deal closes, without any additional manual input.
We go into more detail in the article "Margin on second-hand cars: what is normal and how to calculate it".
The third is the REBU register: generating it automatically with each transaction, with all the mandatory fields (purchase and sale dates, supplier details with tax ID (NIF), vehicle description, purchase price, sale price and margin). Without that register kept up to date, the tax authorities can reject the scheme during an inspection.
Read REBU register: what it is, what it must include and how to keep it.
The fourth is separating per-vehicle expenses from the business's general expenses: each expense invoice must be assignable to the specific vehicle it relates to (transport, workshop) or classified as a general expense (portals, rent, payroll). Without that separation, the margin per deal isn't reliable.
General-purpose accounting programs: what they can and can't do
Holded, Sage 50, A3, Contasimple and the like are valid programs for any company's general accounting. They keep the journal, generate the tax forms (303, 347, 390) and have invoicing modules. For a self-employed service provider or a small shop, they are enough.
See also why Holded, Sage, and A3 do not manage REBU well in a car dealership.
For a used car dealership, they have three structural limitations that can't be solved through configuration.
The first is the lack of a per-vehicle file. These programs work with inventory items or invoice lines, not with files that group the purchase, expenses and sale of a single asset. The owner has to build that tracking manually in Excel or on a separate sheet, with the risk of errors and duplicated work that entails.
The second is REBU management. None of these programs has REBU built in natively. You can set up an invoice type without itemised VAT, but calculating the margin, linking it to the purchase price and generating the register have to be done manually. With 5 cars a month it's manageable. With 20 or more, it's a constant source of errors.
The third is that they don't integrate the dealership's operational management: stock, portals, leads and transfer paperwork services. The owner ends up with two or three unconnected systems, entering the same data several times and without a complete view of the business in one place.
The real cost of using a general-purpose program isn't just the monthly fee. It's the fee plus the time the owner or an employee spends manually building what the software doesn't do. For a dealership selling 15 or more cars a month, that time can exceed 8 or 10 hours a month.
The alternative: a DMS with built-in per-vehicle accounting
A DMS (Dealer Management System) built for used car dealers treats the vehicle as the business unit from the system's design onwards. Each car has its file with the purchase price, associated direct expenses, the applicable tax scheme and the sale price. The invoice is generated from that file under the correct scheme, the REBU register updates automatically and the net margin is calculated with no extra work.
The difference from a general-purpose accounting program isn't about features: it's about architecture. A general-purpose program can add modules to try to cover REBU, but the per-vehicle file isn't part of its core logic. A DMS has it from the start.
For the accounting agency or tax advisor, the DMS exports the quarter's data in the required format: a summary of REBU transactions with taxable bases, standard-scheme invoices with itemised VAT, and the full REBU register. The accounting agency receives the information organised and can prepare the tax forms in much less time.
See also the accounting obligations of a second-hand dealership.
What to look at before choosing accounting software
Before signing up for any accounting software for a used car dealership, there are five questions that need a yes answer.
Does it handle REBU natively, calculating the margin automatically from the vehicle file? Does it generate the REBU record book with all mandatory fields without manual work? Is it certified for Verifactu and does it send each invoice record to the AEAT in real time? Does it let you link each vehicle's direct costs to the corresponding file? Can it export the quarter's data in a format the agency can use directly?
Read also what Verifactu requires and how to adapt as a dealership.
If any of those questions gets a no or a conditional answer, the software will require additional manual work to make up for what it doesn't do. That work has a real cost even if it doesn't appear on any invoice.
Dealcar and accounting built into dealership management
Dealcar integrates per-vehicle accounting directly into stock management. Every purchase or sale automatically updates the vehicle file, the REBU record book and the quarterly totals. The invoice is generated under the correct scheme from the file with no manual data entry.
At the close of each quarter, the data export for the agency is ready without having to prepare anything: summary of REBU transactions, output VAT under the general scheme, deductible expenses and record book. Dealcar is certified for Verifactu.
You can see how integrated accounting works in dealcar.io/software-concesionario or at dealcar.io/facturacion-electronica-coches.
Frequently asked questions
Can I keep using Holded or Sage for general accounting and Dealcar for managing the dealership?
Yes. It's the model many advisory firms use: Dealcar handles the dealership's operations (stock, REBU invoicing, record book) and exports the data to the advisory firm, which integrates it into its usual accounting software. There's no need to migrate the company's general accounting if the advisory firm is comfortable working with its own software.
Can a general-purpose accounting program be adapted to REBU with manual configuration?
Technically yes, but with manual work that repeats on every transaction. The risk is that if someone applies the wrong invoice type or forgets to update the record book, the error isn't detected automatically. At low volumes it's manageable; from 15 or 20 cars a month, the accumulated risk of errors justifies a system that handles it automatically.
How much does a DMS with integrated accounting cost for used car dealers?
Dealcar's entry plans start from 90 euros a month and include stock management, Verifactu-certified REBU invoicing, the automatic record book and data export for the agency. To compare options and price ranges, see the guide to how much software for used car dealers costs.
Does the DMS completely replace the agency?
No. The DMS organises and automates the dealership's accounting data. The agency files the tax returns, handles the year-end close and advises on tax decisions. They're complementary functions. What the DMS changes is the time the agency needs to do its work: if it receives the data organised, it can do it in much less time.
