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Used car trading
Used-car trading means buying vehicles to resell for profit, so it needs more capital and carries more responsibility than selling your own car. Costs and trader earnings are not reliably stated; check the rules for your part of the UK or Ireland before buying stock.
Open the interactive guide (checklist, video, read-aloud) →In plain words
- You buy a car and try to sell it for more.
- Repairs, insurance and adverts can cost money.
- Check the car, its history and papers before buying.
- Be honest about faults and keep every receipt.
- Rules differ across Northern Ireland, Great Britain and Ireland.
Who it suits
Adults who know something about cars, can assess condition and paperwork, and can afford to tie money up in a vehicle while they find a buyer. It is not a low-risk way to make quick money.
People look for used cars that suit their needs and budget. A well-checked car, an accurate advert and clear answers can help buyers decide whether to make an offer.
Step by step
- Choose where you will trade and separate stock from personal sales. Decide whether you are buying cars specifically to resell, and where you will store and show them. Keep records for business stock separate from records for your own car. About 1-2 hours.
- Set a spending limit before looking at cars. Decide how much money you can tie up without relying on a quick sale. Allow for the purchase, repairs, preparation, insurance, advertising and a delay before a buyer appears. About 30-60 minutes.
- Compare similar cars and calculate your likely margin. Write down the likely sale price before making an offer. Subtract the purchase price and expected repairs and other costs; do not buy if the result does not fit your plan. About 30-90 minutes per car.
- Check the car, its history, condition and paperwork. Check the vehicle’s history, mileage, condition and documents before buying. Arrange an independent inspection if you cannot confidently assess it yourself. About 1-3 hours per car.
- Keep a record of every cost and sale. Save what you paid, receipts for work, advertising costs and the final sale details. These records help you see whether the business is making money and help with record-keeping and tax obligations. About 10-20 minutes per transaction.
- Prepare the car and write an honest advert. Include the make, model, technical details, mileage, condition and known faults. Do not hide important information or present business stock as a private sale Darlington Borough Council. About 2-5 hours per car.
- Set a price and manage buyer questions clearly. Use comparable listings to choose a price. Decide in advance whether you will negotiate, reply clearly to questions, and keep a record of offers and the agreed sale. About 30-60 minutes to price; messages vary.
- Confirm payment and complete the handover. Before handing over the car, check that payment has cleared. Complete the relevant ownership and handover paperwork for your country, and keep copies of the advert, sale details and receipts. About 30-90 minutes.
- Review the sale before buying another car. Note the actual sale price, time taken and all costs. Use the result to decide whether another car is a sensible risk for your budget. About 20-30 minutes.
Your first 15 minutes
Choose the country where you plan to trade, compare several similar cars for sale, and build a written cost-and-sale-price estimate for one possible purchase before committing money.
The money
Compare similar cars and estimate the sale price before you buy. Subtract the purchase price, likely repairs, preparation, insurance and advertising costs, then decide whether the possible margin is worth the risk; there is no reliable earnings figure. Your actual result may be lower or negative.
Example only: UK one-car sale: £3,500 sale price − £3,000 purchase − £300 other costs = £200 before tax. Ireland one-car sale: €5,600 sale price − €5,000 purchase − €450 other costs = €150 before tax. These are invented example figures, not typical earnings or a forecast.
The rules
Trading used cars can involve tax, consumer and vehicle rules in the UK and Ireland. In Ireland, you need Revenue authorisation and must follow extra vehicle-registration and VAT rules if you deal in unregistered vehicles. Check the rules for your situation before you buy stock.
UK and Northern Ireland
- Tax and Self Assessment. The trading allowance covers the first £1,000 of trading income in a tax year. If your income is over that amount, tell HMRC. The allowance is based on gross income before expenses. If you need to register for Self Assessment, the deadline is 5 October after the tax year ends GOV.UK Tax Help for Hustles GOV.UK.
- VAT. You must register for VAT if your taxable turnover is over £90,000 Business.gov.uk.
- Selling to consumers. In England, Scotland and Wales, traders must follow consumer rights rules. You cannot avoid them with wording such as “sold as seen” or “trade sale”. You must not sell or offer an unroadworthy vehicle for sale. If you sell a vehicle for spares or repair, identify it clearly. It must not be driven away from your premises Darlington Borough Council. This guidance does not cover Northern Ireland. Trading Standards NI flags misleading claims about second-hand vehicles. It does not list trader registration or licensing rules. Check with Trading Standards Service NI about your situation Trading Standards Service NI.
- Online or distance sales. For a sales contract made at a distance, the normal cancellation period is 14 days after the buyer receives the goods. Exceptions may apply. Check the rules for your sales method and location before selling online UK legislation UK Government guidance.
- Advertising and customer data. If you publish advertising or affiliate content, label it clearly. For example, use “Ad” Advertising Standards Authority. If you collect or use customer details, use the ICO self-assessment tool to check whether you need to pay a data protection fee. Not every sole trader has to pay ICO.
- Licence, insurance and age. There is no general used-car trader licence or minimum legal trading age identified for the UK. Consider suitable insurance. Check with your insurer, platform and local Trading Standards before you start trading.
Ireland
- Income tax and VAT. If you work for an employer and have taxable non-PAYE income over €5,000, or gross non-PAYE income over €30,000, the guidance says to register for self-assessment using Form 11. Below those amounts, declare the income on Form 12 through myAccount Revenue. The VAT threshold for goods is €85,000 Revenue.
- Unregistered vehicles. You need Revenue authorisation as a motor trader if you manufacture, distribute, deal in, deliver, store, repair or modify unregistered vehicles. Apply to the VRT Control Officer through MyEnquiries. Form VRT1 is the application form. You must intend to trade actively, have suitable premises that planning laws allow you to use, be VAT-registered and hold a current Tax Clearance Certificate. Only authorised dealers may hold unregistered vehicles Revenue. If you get an unregistered vehicle without authorisation, you must register it in your own name and pay VRT. Book an appointment with an NCTS Centre within 7 days of the vehicle entering the State. If you imported it, the 7 days start when it is released from customs control. Complete registration within 30 days of that event. Registration is treated as a VAT self-supply. You must repay VAT claimed on the vehicle’s purchase, and use the Margin Scheme for its later sale Revenue. Generally, you do not pay VRT on an Irish second-hand vehicle that was previously registered in the State. A vehicle brought in from another country may be liable for VRT when you register it here Revenue.
- Business name. If you trade under a name other than your own, register that name with the CRO. Online registration costs €20 CRO.
- Selling to consumers. The Car-spot advice covers private sales, not all the rules for a used-car trading business. Do not assume that private-sale advice applies to your business. Check the rules for selling to consumers as a trader Car-spot.
- Online sales and advertising. For an online purchase of goods from a business, the consumer generally has 14 days from receiving the goods to tell you they are cancelling. They then have a further 14 days to return them. Before purchase, give the required information. This includes your business name and contact details, product details, the total price and charges, and cancellation information. Give the buyer a cancellation form and explain how to use it. Refund the buyer within 14 days of being told about the cancellation, once you have received any returned items. If you do not explain the cancellation right, it may be extended to 12 months beyond the normal period CCPC. If you publish commercial or influencer content, label it clearly. For example, use “#Ad” CCPC.
- Insurance, data and age. Consider suitable insurance and check with an insurer before buying or moving stock. There is no minimum legal trading age identified for this business. Irish data-protection rules for this business are not set out here.
Checked against official sources: 22 October 2026. Not yet reviewed by a qualified tax or legal adviser. General guidance, not legal advice. Check the official link beside each point before you start.
Common mistakes
- Buying before setting a budget that includes repairs and delays.
- Relying on a hoped-for sale price instead of comparing similar cars.
- Skipping an independent inspection when you cannot assess the car confidently.
- Leaving out known faults or presenting business stock as a private sale.
- Failing to keep receipts, offers, adverts and sale records.
AI-made demonstration: this module has a 20-second street-chat video in the interactive guide. The presenter and the people in it are computer-generated, not real people.