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Is Your Dealership Stock Book HMRC Compliant?

Running A Car Dealership 2nd April 2026

If you are you buying or selling second-hand vehicles in the UK, you are able to use the VAT Margin Scheme to account for VAT. Using the scheme enables you to pay VAT to HMRC on the difference between the price you pay for a second-hand vehicle and the price you sell it for, instead of the full amount on the selling price only of each qualifying vehicle. To find out more on the VAT Margin Scheme watch our full guide here: VAT Margin Scheme for Used Cars

In the UK car dealers using the VAT Margin Scheme must keep HMRC compliant VAT records as well as a stock book outlining each vehicle sold under the scheme. Records must be complete, up to date and be kept for at least 6 years. Incomplete or manual records increase HMRC risk and administrative burden. At MotorDesk we help car dealers to ensure that their dealership stays compliant with HMRC when selling vehicles under the Marginal VAT Scheme. Read more

Why Compliance Matters For Car Dealers?

If the records you keep do not support the VAT Margin Scheme treatment, you dealership could face VAT adjustments, disputes or penalties.

Keeping accurate VAT records will enable the correct calculation of VAT which is payable as well as reclaimable, therefore ensuring you are paying the right amount.

When HMRC suspects discrepancies in a Company's VAT returns or financial records, it may trigger a VAT investigation. HMRC will review all the Company's financial records, including; sales and purchase invoices, VAT calculations, VAT returns, bank statements and any other documentation which they deem relevant. Key personnel may also be interviewed to gather further information about business operations and financial processes. Any investigation could cause huge disruption to business operations, keeping complete and organised your records allows you to respond easier and more efficiently.

Failing a VAT Investigation may result in penalties, including:

Financial Penalties - Up to 100% of the unpaid VAT amount.
Interest on Late Payments - Accumulated interest on overdue VAT.
Criminal Charges - Severe fraud cases may lead to legal action and imprisonment.
Business Restrictions - HMRC may impose future tax restrictions on repeat offender

Correct compliance also supports smoother handovers to your accountant ensuring cleaner year end reviews and reporting.

Common Stock Book Mistakes Which Can Put Dealers At Risk

If you are a busy dealership, it is hard to keep on top of the requirements needed to stay compliant. Purchase invoice numbers are easily missed and prioritising having full supplier details is difficult when you are running a dealership. As a business owner you not only have to be accountable for your processes within the business but your employees as well, this can be a further challenge. The most common mistake for Dealers is the values being used for calculating the margin, for example any work done to fix or improve the car after purchase cannot be included in the purchase price but the selling price needs to include any accessories which were added prior to the sale of the car. When you are buying, selling and reconditioning multiple vehicles you can see how compliance with HMRCs requirements can be tricky.

What Does HMRC Require In A Margin Scheme Stock Book?

As soon as you register to become a VAT-registered business, HMRC requires you to keep the following records. You must ensure that all VAT records are digitally stored unless you are exempt from the Making Tax Digital rules.

Stock Book Requirements

For each vehicle sold under the marginal VAT scheme you must keep records for each item you purchased and sold which you will be using to calculate the margin for that vehicle.

Purchases Requirements:

Unique stock number
Date of purchase
Purchase invoice number (unless self issued)
Purchase price
Name of seller
Item Description

Sales Requirements:

Date of sale
Sales invoice number
Selling price
Name of buyer

The Calculation:

Margin on Sale (total selling price less total purchase price)
VAT on Margin (the margin divided by 6)

Additionally, if you sell a vehicle which was supplied to you on a sale or return basis, you must have the following details in your stock book:

the date of transfer of the vehicle
the address of the dealer or person transferring the vehicle
the date of sale or return

What Supporting Records Should Dealers Keep Alongside The Stock Book?

The margin scheme requirements are not the same as general VAT recording keeping, they require additional elements.

When you buy a vehicle you plan to sell under the margin scheme, the invoice must include:

Date of purchase
Seller's name and address
Your or your business name and address
Purchase invoice number (unless self issued)
Purchase price
Item description

If the item was bought from another VAT-registered person or business, the invoice will need:

Unique stock number
Specific wording of 'margin scheme - second hand goods' or similar approved wording

When you sell a vehicle you plan to claim for under the margin scheme, the invoice must include:

Date of sale
Sales invoice number
Your name, address & VAT number
Buyer's name & address
Item description
Unique stock number
Total price - VAT must not be shown separately
Specific wording of 'margin scheme - second hand goods' or similar approved wording

There are additional record-keeping requirements where vehicles are sold with finance or part exchange, as the values shown on finance agreements, deposits and supporting documents must match up with the Dealership's stock book, VAT records and financial records.

All VAT records must be kept for at least 6 years, even if you have ceased trading.

Do Dealers Need A Stock Book If They Use Accounting Software?

Yes, if you buy and sell vehicles under the VAT Margin Scheme, accounting software alone does not remove the requirement of margin scheme records. The accounting software you use may record the transactions, hold copies of invoices and store supplier's information but HRMC still expects a Dealers to have an up to date stock book which tracks each margin scheme vehicle individually.

Although your accounting software keeps the usual VAT records, as outlined above, HMRC is a lot stricter when the margin scheme is used.

What Should A Good Digital Stock Book System Do?

Now HMRC have enforced Making Tax Digital for VAT, all VAT-registered businesses should now file their records digitally, this can be within spreadsheets or a software. A compliant stock book is not just about holding all of information which is needed, it should also make it easier for you to maintain accurate and consistent records which are easily accessible.

A digital stock book should include:

A unique record for each vehicle
All required purchase and sale information
Supporting documentation linked to each record to provide a clear audit trail
Accurate margin calculations
Allow for user friendly access to find and retrieve records

Having a system in place which enables you to manage all your invoicing, purchases, stock management and VAT records in one place is ideal, this ensures consistency across the dealership's records. It also removes the need for entering the same data more than once and in turn reduces the chance of errors occurring. Not only does a good digital stock book support compliance, by giving dealers confidence that their records are accurate and up to date it will allow day to day business processes to be more streamlined and efficient.

How MotorDesk Supports Compliance

MotorDesk is a Dealer Management System (DMS) designed for independent used car dealerships, alongside keeping your stock book HMRC compliant, you are able to manage your whole Dealership in one place. Read more about all the features MotorDesk has here: Car Dealer Management Systems & Software - MotorDesk

MotorDesk supports Dealers to maintain vehicle-by-vehicle stock records in one place, with stock, invoicing, vehicle details and deal data connected in a single system. This reduces the risk of records becoming mismatched across spreadsheets, paper files and separate platforms, as well as allowing for cleaner reporting and a more consistent audit trail for dealerships using the VAT Margin Scheme.

MotorDesk enables dealers and accountants to access the information needed to review purchases, sales and margins efficiently, it also reduces manual entry and the risk of discrepancies or duplication with its live integrations to accounting software ensuring data is accurate and up to date across systems.

MotorDesk does not replace the need for dealers to follow HMRC rules, but it does make compliant record keeping far easier, more consistent and easier to manage within your Dealership.

Get Started

If you're interested in trying the MotorDesk car dealer software we offer a full 30-day free trial! Watch our short demonstration video or book a personalised demo via video call and get 5% discount for 3 months.