Why the Margin Scheme Matters for Car Dealers
If you’re a used car dealer in the UK, the VAT Margin Scheme is almost certainly the most important VAT rule affecting your bottom line. Without it, you’d be paying 20% VAT on the full selling price of every vehicle - even though you bought most of your stock from private individuals who didn’t charge you any VAT in the first place. There’d be no input VAT to reclaim, and the maths would be devastating.
The Margin Scheme fixes this by letting you pay VAT only on the profit margin - the difference between what you paid for the car and what you sold it for. For a typical used car sale, this can reduce your VAT bill by 60-70% compared to standard VAT accounting. That’s real money: on a £7,500 car bought for £5,000, the scheme saves you over £833 in VAT on that single sale.
The motor trade is one of the largest sectors using the Margin Scheme, and HMRC knows it. Car dealers face more scrutiny than most margin scheme users, particularly around record keeping and eligibility. Getting it right isn’t optional - it’s essential for staying profitable and staying out of trouble with HMRC.
Key point: The Margin Scheme is governed by VAT Notice 718 and specifically VAT Notice 718/1 for the motor trade. These HMRC notices are the definitive source, and this guide is based on them.
This guide covers everything a used car dealer needs to know: the calculation method with worked examples, exactly when you can and can’t use the scheme, how to handle part exchanges, what records you must keep, and the common mistakes that trigger HMRC enquiries. For the general Margin Scheme rules covering all goods, see our complete VAT Margin Scheme guide.
How the Margin Scheme Works for Used Cars
The principle is simple. You buy a used car from a private seller who doesn’t charge VAT. You prepare the car and sell it to your customer. Instead of charging VAT on the full selling price, you calculate VAT only on the margin - the difference between purchase price and selling price. The VAT is embedded in your selling price; the customer never sees it broken out separately.
You divide by 6 because the margin is treated as VAT-inclusive. One-sixth extracts the 20% VAT from the gross margin (since the net margin is 5/6 and 20% of 5/6 = 1/6). Let’s see this in action with a real example.
Worked Example: Used Car Sale
Under the VAT Margin Scheme
£5,000
£7,500
Under Standard VAT (Without the Margin Scheme)
The saving: On this single sale, the Margin Scheme saves you £833.33 in VAT (£1,250 − £416.67). That’s a 66% reduction. Over a year selling 100 cars with similar margins, that’s over £83,000 in VAT savings.
If your margin is zero or negative (you sell the car for the same price or less than you paid), no VAT is due. You cannot reclaim VAT on a loss under the item-by-item method, but you also don’t owe anything. Use our free VAT Margin Calculator to run your own figures instantly.
When You CAN Use the Margin Scheme
Eligibility depends entirely on who you bought the vehicle from and whether VAT was charged on the purchase. You can use the Margin Scheme when the vehicle was acquired from any of the following sources:
Private individuals
The most common scenario. A member of the public selling their personal car. No VAT is involved, so you can use the scheme on resale.
Another margin scheme dealer
If you buy from another dealer who sold under the Margin Scheme, no VAT was shown on their invoice. You can use the scheme again on your resale.
Businesses that couldn’t reclaim VAT
Some businesses (e.g., those making exempt supplies like insurance companies or driving schools) cannot reclaim VAT on their vehicle purchases. When they sell, you can use the scheme.
Insurance companies
Write-off vehicles purchased from insurers qualify. Insurance companies make exempt supplies and don’t charge VAT when disposing of salvage or category vehicles.
Finance companies
Vehicles repossessed by finance or leasing companies. Like insurers, finance companies providing exempt supplies cannot reclaim VAT, so the car is eligible for the scheme.
Auctions (if conditions met)
Vehicles bought at auction can qualify, but you must confirm the original seller’s status. If the auctioneer sold on behalf of a private individual, you can use the scheme. If sold on behalf of a VAT-registered business that charged VAT, you cannot.
Tip: Always check the auction documentation carefully. Reputable motor auctions such as BCA and Manheim clearly indicate on the invoice whether a vehicle is “margin scheme qualifying” or “VAT qualifying.” If VAT is shown on the invoice, you cannot use the margin scheme on resale - but you can reclaim that input VAT instead.
When You CANNOT Use the Margin Scheme
There are clear situations where the Margin Scheme is off limits. Using it incorrectly is a serious compliance risk - HMRC can retrospectively assess the full VAT on every mis-classified sale.
- Bought from a VAT-registered business that charged VAT - if the purchase invoice shows VAT as a separate line item, you cannot use the scheme. Instead, reclaim the input VAT and account for output VAT normally on the sale.
- New vehicles - brand-new cars that have never been registered or supplied to an end user are not eligible for the scheme. The scheme applies only to second-hand goods.
- Vehicles where you reclaimed input VAT - if you bought a car with a VAT invoice and reclaimed the VAT as input tax, you must use normal VAT accounting when you sell. You cannot double-dip.
- Fleet disposals from VAT-registered companies - a common trap. When a VAT-registered fleet operator or rental company disposes of vehicles, they charge VAT. Even though the car is “used,” the presence of VAT on the purchase disqualifies the scheme.
The golden rule: Look at the purchase invoice. If VAT is shown separately, use normal VAT accounting. If no VAT is shown (private sale, margin scheme sale, or exempt seller), you can use the Margin Scheme. When in doubt, ask the seller for clarification before you buy, and keep written evidence of the seller’s VAT status.
Record Keeping for Used Cars
Used car dealers using the Margin Scheme must maintain a stock book that goes beyond the standard margin scheme records. Because motor vehicles are high-value, individually identifiable assets, HMRC expects much more detailed documentation. The stock book is your primary defence if HMRC queries your VAT position, and inspectors will examine it closely.
What your stock book must include for every vehicle
| Field | Details |
|---|---|
| Stock number | A unique internal reference for each vehicle in your stock |
| VIN | Vehicle Identification Number (chassis number) - the permanent unique identifier |
| Registration number | Current number plate at time of purchase and sale |
| Make, model & year | Full vehicle description (e.g., “Ford Focus 1.6 Zetec 2019”) |
| Mileage | Odometer reading at purchase and at sale |
| Purchase details | Date of purchase, purchase price, and seller’s full name and address |
| Sale details | Date of sale, selling price, and buyer’s name and address |
| Margin & VAT | Calculated margin and VAT due for each vehicle |
HMRC takes car dealer records very seriously
The motor trade is a high-risk sector for HMRC. Inspectors are trained to spot incomplete stock books, and they routinely cross-reference your records with DVLA data. If your stock book is missing vehicles, has gaps in dates, or lacks seller details, HMRC can deny the Margin Scheme for those vehicles and assess VAT on the full selling price. Keep records for 6 years minimum.
Your stock book can be a physical ledger, spreadsheet, or dealer management system (DMS). Under Making Tax Digital, digital records are now mandatory for VAT. Most modern DMS solutions (e.g., Autotrader’s i-Control, Dragon2000, Gemini) have built-in margin scheme tracking. If you use a spreadsheet, make sure it captures all the fields above and is backed up regularly.
Part Exchange Deals
Part exchanges are a staple of the used car trade, and they work perfectly well under the Margin Scheme - but you need to understand how the values interact. The key principle is that the part-exchange allowance you give becomes the purchase price of the incoming vehicle for your next margin scheme calculation.
Worked Example: Part Exchange
Part Exchange Transaction
For Car A (the one you’re selling):
For Car B (the part-exchange you’re taking in):
Tip: The selling price for margin scheme purposes is always the full advertised price, not the cash amount the customer hands over. In the example above, the selling price for Car A is £12,000, not £8,000. The part-exchange is simply the method of payment, and the £4,000 allowance is the purchase price of Car B for your stock book.
If the customer’s part-exchange vehicle was originally purchased by the customer as a private individual (not a VAT-registered business), you can use the scheme when you resell it. This is the case in the vast majority of part-exchange transactions with retail customers.
Repairs and Improvements
This is one of the most misunderstood areas of the Margin Scheme for car dealers. The question always comes up: “I spent £1,200 getting this car ready for sale - can I add that to my purchase price to reduce the margin?”
The answer is no. Under the Margin Scheme, the purchase price is strictly the amount you paid to acquire the vehicle. You cannot add repair costs, MOT fees, valeting costs, transport costs, or any other preparation expenses to the purchase price. The margin is always calculated as selling price minus the original purchase price - nothing more.
This is explicitly stated in VAT Notice 718/1. HMRC is very clear: costs of repair, refurbishment, or improvement are separate business expenses. They do not form part of the margin calculation.
So how are repair costs treated?
Repair costs are standard business overheads. If you’re VAT-registered and the repair invoice shows VAT, you can reclaim the input VAT on the repair costs through your normal VAT return. This provides some tax relief, just not through the margin calculation.
Example: Car with Repairs
Common mistake: Adding repair costs to the purchase price is one of the most frequent errors HMRC finds during motor trade inspections. It artificially reduces the margin and therefore the VAT due. If discovered, HMRC will re-assess the VAT on the correct margin, plus penalties and interest. Don’t risk it.
Invoicing Rules
When selling a vehicle under the Margin Scheme, your invoice must follow specific rules that differ from standard VAT invoicing. The most important rule is about what you must not include.
Critical rule: You must NOT show VAT separately on a Margin Scheme invoice. The selling price is a single, VAT-inclusive figure. If you show VAT as a separate line, the buyer may attempt to reclaim it as input tax - which they’re not entitled to. This can also invalidate your use of the scheme for that sale.
Your invoice must include
- Your business name, address, and VAT registration number
- A unique invoice number
- Date of sale
- Vehicle details: make, model, year, registration number, VIN
- Buyer’s name and address
- Total price (single VAT-inclusive figure)
- A statement that the vehicle is sold under the margin scheme
Recommended wording: Include a clear statement such as: “Margin scheme - second-hand goods. VAT included in the total price and cannot be reclaimed by the buyer.” or simply “Sold under the second-hand margin scheme.” This prevents any confusion or dispute about VAT recovery.
The buyer of a margin scheme vehicle cannot reclaim any VAT on the purchase, even if they are themselves VAT-registered. This is an important point for trade sales - if a dealer buys from you under the margin scheme, they in turn can use the scheme when they resell, but they cannot reclaim input VAT on their purchase from you.
Common Mistakes Car Dealers Make
HMRC sees the same errors in motor trade inspections time and again. Avoid these pitfalls to stay compliant and protect your margins.
Adding repair and preparation costs to the purchase price
This is the number one mistake in the motor trade. Spending £1,500 on an engine repair, new tyres, and a valet does not increase your “purchase price” for margin scheme purposes. The purchase price is what you paid the seller for the vehicle - full stop. Repair costs are separate business expenses. You can reclaim VAT on those repair invoices, but they don’t reduce your margin.
Using the scheme on a trade-in from a VAT-registered fleet company
When a VAT-registered business (such as a fleet operator, rental company, or leasing firm) sells or part-exchanges a vehicle, they charge VAT. You should reclaim this input VAT and account for output VAT normally on the resale. Using the margin scheme on these vehicles is incorrect and will be caught when HMRC cross-references your records.
Inadequate stock book records
Missing VINs, no registration numbers, vague descriptions (“Ford, blue” instead of “Ford Fiesta 1.0 Zetec 2020, WF0XXXXXXXXXXXXX, AB21 CDE”), absent seller details, or gaps in the purchase-to-sale trail. HMRC inspectors compare your stock book against DVLA keeper records. If a vehicle appears in DVLA records as having been registered to your dealership but isn’t in your stock book, you have a problem.
Showing VAT separately on invoices
Some dealers’ invoice templates automatically show a VAT breakdown because the template was designed for standard VAT sales. Under the margin scheme, the invoice must show a single total price with no VAT line. Check your DMS or invoice template to make sure it has a margin scheme mode that suppresses the VAT breakdown.
Not verifying the seller’s VAT status at auction
At auction, it’s your responsibility to check whether the vehicle is “margin qualifying” or “VAT qualifying” before bidding. Buying a VAT-qualifying car and treating it as margin scheme stock is an error that HMRC can trace. Always check the auction documentation and keep the buyer’s slip showing the vehicle’s VAT status.
Forgetting the margin scheme on the VAT return
Box 6 of your VAT return must include the full selling price of margin scheme vehicles, not just the margin. And Box 1 must include the VAT calculated on the margins, not on the full selling prices. These two numbers are commonly confused. If your Box 6 turnover doesn’t match HMRC’s expectations (they receive data from DVLA and third parties), it can trigger an automated compliance check.
Calculate Your VAT Margin Instantly
Whether you’re pricing up a vehicle for the forecourt or working out how much VAT you owe this quarter, our free calculator handles the Margin Scheme maths for you - instantly.